Apache Point Observatory
New Mexico, USA

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ARC 3.5-m Instrument News

Note: Comments in bold are to catch the readers attention as the most relevant for their upcoming science observations

News Worthy Items

• ARCES is available. See below for more information.
• DIS is available. See below for more information.
• AGILE is available. See below for more information.
• ARCTIC is available. See below for more information.
• KOSMOS is available. See below for more information.
• NICFPS is available. See below for more information.
• Triplespec is available. See below for more information.

Current Status

Instrument issues which our users should be aware of before taking data. For historical information go here. For future instrumentation or planned upgrades go here.

• 2022-11-28: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS i nformation. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-11-21: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS i nformation. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-11-14: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS i nformation. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-11-07: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS i nformation. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-10-31: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS i nformation. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-10-24: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS i nformation. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-10-17: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS i nformation. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-10-10: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS i nformation. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-10-03: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS i nformation. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-09-26: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS information. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-09-19: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS information. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-09-12: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS information. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-09-06: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS information. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-08-29: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS information. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-08-22: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS information. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-08-15: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS information. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-08-01: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS information. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-07-25: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS information. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-07-18: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS information. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-07-11: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS information. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-07-05: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS information. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2022-06-27: Instrument is operating nominally. Since this past December, the fits headers were missing telescope and WCS information. We believe it is a network file system problem. Hopefully this has been resolved soon.
• 2012-01-24: APO still does not recommend taking dome flats with AGILE. More information can be found here.

• 2022: Most recent interorder ratio plot can be found here.
• 2022-11-28 The instrument is operating nominally. IOL ratios appear to be leveling off. The change has been rather slow (which is preferred).
• 2022-11-21 The instrument is operating nominally. IOL ratios appear to be leveling off. The change has been rather slow (which is preferred).
• 2022-11-14 The instrument is operating nominally. IOL ratios appear to be leveling off. The change has been rather slow (which is preferred).
• 2022-11-07 The instrument is operating nominally. IOL ratios appear to be leveling off. The change has been rather slow (which is preferred).
• 2022-10-31 The instrument is operating nominally. IOL ratios appear to be leveling off (but may still be climbing very slowly). The change has been rather slow (which is preferred).
• 2022-10-24 The instrument is operating nominally. IOL ratios appear to be leveling off (but may still be climbing slowly). The change has been rather slow (which is preferred).
• 2022-10-17 The instrument is operating nominally. IOL ratios appear to be leveling off. The change has been rather slow (which is preferred).
• 2022-10-10 The instrument is operating nominally. IOL ratios appear to be leveling off. The change has been rather slow (which is preferred).
• 2022-10-03 The instrument is operating nominally. IOL ratios appear to be leveling off. The change has been rather slow (which is preferred).
• 2022-09-26 The instrument is operating nominally. IOL ratios appear to be leveling off. The change has been rather slow (which is preferred).
• 2022-09-19 The instrument is operating nominally. IOL ratios are back on the rise in the bluest orders but are still quite acceptable. The change has been rather slow (which is preferred). The quick dip and return the first half of June coincided with a hot spell and the then a start of monsoon season which brought cooler weather and a short increase in the IOL ratio. IOL ratios are still quite good and back to March peaks. The best ratios we have experienced since 2019.
• 2022-09-12 The instrument is operating nominally. IOL ratios are back on the rise in the bluest orders but are still quite acceptable. The change has been rather slow (which is preferred). The quick dip and return the first half of June coincided with a hot spell and the then a start of monsoon season which brought cooler weather and a short increase in the IOL ratio. IOL ratios are still quite good and back to March peaks. The best ratios we have experienced since 2019.
• 2022-09-06 The instrument is operating nominally. IOL ratios are back on the rise in the bluest orders but are still quite acceptable. The change has been rather slow (which is preferred). The quick dip and return the first half of June coincided with a hot spell and the then a start of monsoon season which brought cooler weather and a short increase in the IOL ratio. IOL ratios are still quite good and back to March peaks. The best ratios we have experienced since 2019.
• 2022-08-29 The instrument is operating nominally. IOL ratios are back on the rise in the bluest orders but are still quite acceptable. The change has been rather slow (which is preferred). The quick dip and return the first half of June coincided with a hot spell and the then a start of monsoon season which brought cooler weather and a short increase in the IOL ratio. IOL ratios are still quite good and back to March peaks. The best ratios we have experienced since 2019.
• 2022-08-22 The instrument is operating nominally. IOL ratios are back on the rise in the bluest orders but are still quite acceptable. The change has been rather slow (which is preferred). The quick dip and return the first half of June coincided with a hot spell and the then a start of monsoon season which brought cooler weather and a short increase in the IOL ratio. IOL ratios are still quite good.
• 2022-08-15 The instrument is operating nominally. IOL ratios are declining in the bluest orders but are still quite acceptable. The change has been rather slow (which is preferred). The quick dip and return the first half of June coincided with a hot spell and the then a start of monsoon season which brought cooler weather and a short increase in the IOL ratio. IOL ratios are still quite good.
• 2022-08-01 The instrument is operating nominally. IOL ratios are declining in the bluest orders but are still quite acceptable. The change has been rather slow (which is preferred). The quick dip and return the first half of June coincided with a hot spell and the then a start of monsoon season which brought cooler weather and a short increase in the IOL ratio. IOL ratios are still quite good.
• 2022-07-25 The instrument is operating nominally. IOL ratios are declining in the bluest orders but are still quite acceptable. The change has been rather slow (which is preferred). The quick dip and return the first half of June coincided with a hot spell and the then a start of monsoon season which brought cooler weather and a short increase in the IOL ratio. IOL ratios are still quite good.
• 2022-07-18 The instrument is operating nominally. IOL ratios are declining in the bluest orders but are still quite acceptable. The change has been rather slow (which is preferred). The quick dip and return the first half of June coincided with a hot spell and the then a start of monsoon season which brought cooler weather and a short increase in the IOL ratio. IOL ratios are still quite good.
• 2022-07-11 The instrument is operating nominally. IOL ratios are declining in the bluest orders but are still quite acceptable. The change has been rather slow (which is preferred). The quick dip and return the first half of June coincided with a hot spell and the then a start of monsoon season which brought cooler weather and a short increase in the IOL ratio. IOL ratios are still quite good.
• 2022-07-05 The instrument is operating nominally. IOL ratios are declining in the bluest orders but are still quite acceptable. The change has been rather slow (which is preferred). The quick dip and return the first half of June coincided with a hot spell and the then a start of monsoon season which brought cooler weather and a short increase in the IOL ratio. IOL ratios are still quite good.
• 2022-06-27 The instrument is operating nominally. IOL ratios are declining in the bluest orders but are still quite acceptable. The change has been rather slow (which is preferred). The quick dip and return the first half of June coincided with a hot spell and the then a start of monsoon season which brought cooler weather and a short increase in the IOL ratio. IOL ratios are still quite good.

• 2022-11-28: Instrument is operating nominally except for the few water spots still on the fore optics mentioned earlier.
• 2022-11-21: Instrument has hada few quad dropouts around the time of end of servicing the vacuum last week. It appears to be operating nominally except for the few water spots still on the fore optics mentioned earlier.
• 2022-11-15: Camera is been cooled after a last minute ion pump change. Have balanced the bias levels on all 4 quadrants in the three readout modes.
• 2022-11-14: Camera warmed and on vacuum pump to address soft vacuum and poor behaving ion pump. It is not available for use until servicing complete early next week.
• 2022-11-10: Camera warmed and on vacuum pump to address soft vacuum and poor behaving ion pump. It is not available for use until servicing complete early next week.
• 2022-11-07: The camera dewar vacuum appears to have softened some. CCD temperatures are still stable but I may need to put the camera on the pump this week. There are condensation droplets, possibly on the back side of L1 or the front of L2. We have increased the purge air but there still are residue visiable in the UL quadrant of an image. Unfortunately, the water droplets can notbedone at the same time as the vacuum servicing this time. There is currently no schedule for when the next servicing of the instrument and cleaning of the optics will take place. We do not recommend you use flats from previous runs (as the condensation pattern may be changing) and take new flats if possible. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later. The supplemental baffle isinthe process of a redesign.
• 2022-10-31: There are condensation droplets, possibly on the back side of L1 or the front of L2. We have increased the purge air but there still are residue visiable in the UL quadrant of an image. There is currently no schedule for when the next servicing of the instrument and cleaning of the optics will take place. We do not recommend you use flats from previous runs (as the condensation pattern may be changing) and take new flats if possible. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later. The supplemental baffle isinthe process of a redesign.
• 2022-10-24: There are condensation droplets, possibly on the back side of L1 or the front of L2. We have increased the purge air but there still are residue visiable in the UL quadrant of an image. There is currently no schedule for when the next servicing of the instrument and cleaning of the optics will take place. We do not recommend you use flats from previous runs and take new flats if possible. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later. The supplemental baffle isinthe process of a redesign.
• 2022-10-17: There are condensation droplets that appeared last week. We have increased the purge air but there still are residue visiable in the UL quadrant of an image. We do not recommend you use flats from previous runs and take new flats if possible. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later. The supplemental baffle isinthe process of a redesign.
• 2022-10-10: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later. The supplemental baffle isinthe process of a redesign.
• 2022-10-03: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later. The supplemental baffle isinthe process of a redesign.
• 2022-09-26: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later. The supplemental baffle isinthe process of a redesign.
• 2022-09-19: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later. The supplemental baffle was installed but we found an interference issue with the eyelid. Back to redesign.
• 2022-09-12: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later. The supplemental baffle was installed but we found an interference issue with the eyelid. Back to redesign.
• 2022-09-06: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later. The supplemental baffle was installed but we found an interference issue with the eyelid. Back to redesign.
• 2022-08-29: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later. The supplemental baffle was installed but we found an interference issue with the eyelid. Back to redesign.
• 2022-08-22: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later. The supplemental baffle was installed but we found an interference issue with the eyelid. Back to redesign.
• 2022-08-15: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later. The supplemental baffle was installed but we found an interference issue with the eyelid. Back to redesign.
• 2022-08-01: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later.
• 2022-07-25: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later.
• 2022-07-18: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later.
• 2022-07-11: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later.
• 2022-07-05: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later.
• 2022-06-27: Instrument is operating nominally. For those using the new diffuser interface in TUI, the command "arctic status" may be needed to update your window after changing instrument configurations. We are looking into a soultion. The diffuser upgrades are available in 2.6.1a2 and later.
• 2021: APO does not recommend taking dome flats with ARCTIC. We are working on designing a supplemental baffle to correct the problem with cover flats. Currently cover flats produce a gradient across the flat field that is dependant on telescope position (altitude) and rotator angle.

• 2022-11-28: Contamination appears to be horrible on both cameras as reported by Russet. The hope is with a few weeks to months (based on previous experience) it will level off enough that the energy distributed in the wings of the PSF will be redirected back into the core. DIS is still available for use.
• 2022-11-21: Contamination appears to be horrible on both cameras as reported by Russet. The hope is with a few weeks to months (based on previous experience) it will level off enough that the energy distributed in the wings of the PSF will be redirected back into the core. DIS is still available for use.
• 2022-11-14: Contamination may be degrading slowly over the next few weeks to months on the red camera but expected (historically) to turn around and improve. The blue camera contamination seems steady at this time. No recent report fromRusset on contamination status. DIS is available for use.
• 2022-11-07: Contamination may be degrading slowly over the next few weeks to months on the red camera but expected (historically) to turn around and improve. The blue camera contamination seems steady at this time. No recent report fromRusset on contamination status. DIS is available for use.
• 2022-10-31: The instrument vacuum servicing is complete. Contamination may be degrading slowly over the next few weeks to months on the red camera but expected (historically) to turn around and improve. The blue camera contamination seems steady at this time. DIS is available for use.
• 2022-10-24: The instrument vacuum servicing is complete. The water spots on the red camera have been cleaned. Contamination however is moderate from a partial warmup on Friday. DIS is available for use.
• 2022-10-21: The instrument vacuum servicing is complete. Waiting on Russet's report
• 2022-10-17: The instrument is undergoing vacuum servicing. It is unavailable for use until the 4th week of October.
• 2022-10-10: The instrument is undergoing vacuum servicing. It is unavailable for use until the 4th week of October.
• 2022-10-03: The instrument is undergoing vacuum servicing. It is unavailable for use until the 4th week of October.
• Important note concerning the red camera flat field lens. It has significant and noticable water spots that are affecting data collection. Extended object science is not recommended with the red channel at this time. We will not be able to address the problem until late fall or it may return quickly.
• 2022-09-26: The instrument is operating nominally. Blue scattered light is quite good but worse than in July. Water spots on red have not gotten worse but have not improved. Servicing is currently planned for October.
• 2022-09-19: The instrument is operating nominally. Blue scattered light is quite good but worse than in July. Water spots on red have not gotten worse but have not improved. Servicing is currently planned for October.
• 2022-09-12: The instrument is operating nominally. Blue scattered light is quite good but worse than in July. Water spots on red have not gotten worse but have not improved. Servicing is currently planned for October.
• 2022-09-06: The instrument is operating nominally. Blue scattered light is quite good but worse than in July. Water spots on red have not gotten worse but have not improved. Servicing is currently planned for October.
• 2022-08-29: The instrument is operating nominally. Blue scattered light is quite good but worse than in July. Water spots on red have not gotten worse but have not improved. Servicing is currently planned for October.
• 2022-08-22: The instrument is operating nominally. Blue scattered light is quite good but worse than in July. Water spots on red have not gotten worse but have not improved. Servicing is currently planned for October.
• 2022-08-15: The instrument is operating nominally. Blue scattered light is quite good but worse than in July. Water spots on red have not gotten worse but have not improved. Servicing is currently planned for October.
• 2022-08-01: The instrument is operating nominally. Blue scattered light is quite good. Water spots on red have not gotten worse but have not improved. Servicing is currently planned for October.
• 2022-07-25: The instrument is back to operating nominally. Blue scattered light has improved. Water spots on red have not gotten worse but have not improved.
• 2022-07-18: The instrument is back to operating nominally. Blue scattered light has improved. Water spots on red have not gotten worse but have not improved.
• 2022-07-11: The instrument is back to operating nominally. Blue scattered light has improved. Water spots on red have not gotten worse but have not improved.
• 2022-07-05: The instrument is back to operating nominally. Blue scattered light has improved. Water spots on red have not gotten worse but have not improved.
• 2022-06-27: The instrument is back to operating nominally. Blue scattered light has improved. Water spots on red have not gotten worse but have not improved.

• 2022-11-28: Instrument is operating nominally. There was a report this weekend of a small number (less than 5) of exposures with unusual noise that was bleeding into the overscan region.
• 2022-11-21: Instrument is operating nominally.
• 2022-11-14: Instrument is operating nominally.
• 2022-11-07: Instrument is operating nominally.
• 2022-10-31: Instrument is operating nominally.
• 2022-10-24: Instrument is operating nominally.
• 2022-10-17: Instrument is operating nominally. Fixed many of the fits header items from the punch list..
• 2022-10-10: Instrument is operating nominally. Adjusted internal calibration lamp brightnesses further.
• 2022-10-03: Instrument is operating nominally. Adjusted internal calibration lamp brightnesses further.
• 2022-09-26: Instrument is operating nominally.
• 2022-09-19: Instrument is operating nominally.
• 2022-09-12: Instrument is operating nominally.
• 2022-09-06: Instrument is operating nominally. The kcamera (slitviewer) shutter was relaced with a cold rated version over summer shutdown. A small handful of instances which required restart of ICC software because of image write issues or exposures hanging. A user characterized the internal flat field lamps using the ND5 filter in filter wheel 2 and found lots of artifacts. Adjusted ND filter to a OD 0.9 before the integrating sphere for the Internal calibration brightnesses. The punchlist has been updated on the KOSMOS instrument page.
• 2022-08-29: Instrument is operating nominally. The kcamera (slitviewer) shutter was relaced with a cold rated version over summer shutdown. A small handful of instances which required restart of ICC software because of image write issues or exposures hanging. A user characterized the internal flat field lamps using the ND5 filter in filter wheel 2 and found lots of artifacts. Adjusted ND filter to a OD 0.9 before the integrating sphere for the Internal calibration brightnesses. The punchlist has been updated on the KOSMOS instrument page.
• 2022-08-22: Instrument is operating nominally. The kcamera (slitviewer) shutter was relaced with a cold rated version over summer shutdown. A small handful of instances which required restart of ICC software because of image write issues or exposures hanging. A user characterized the internal flat field lamps using the ND5 filter in filter wheel 2 and found lots of artifacts. Adjusted ND filter to a OD 0.9 before the integrating sphere for the Internal calibration brightnesses.
• 2022-08-15: Instrument is operating nominally. The kcamera (slitviewer) shutter is still having intermittent failures but at less frequent intervals now we are in warmer weather. A small handful of instances which required restart of ICC software because of image write issues or exposures hanging. A user characterized the internal flat field lamps using the ND5 filter in filter wheel 2 and found lots of artifacts. We are discussing going back in again and adjusting the amount of ND material at the output of the integrating sphere for the Internal calibration brightnesses.
• 2022-08-01: Instrument is operating nominally. The kcamera (slitviewer) shutter is still having intermittent failures but at less frequent intervals now we are in warmer weather. A small handful of instances which required restart of ICC software because of image write issues or exposures hanging. A user characterized the internal flat field lamps using the ND5 filter in filter wheel 2 and found lots of artifacts. We are discussing going back in again and adjusting the amount of ND material at the output of the integrating sphere for the Internal calibration brightnesses.
• 2022-07-25: Instrument is operating nominally. The kcamera (slitviewer) shutter is still having intermittent failures but at less frequent intervals now we are in warmer weather. A small handful of instances which required restart of ICC software because of image write issues or exposures hanging. A user characterized the internal flat field lamps using the ND5 filter in filter wheel 2 and found lots of artifacts. We are discussing going back in again and adjusting the amount of ND material at the output of the integrating sphere for the Internal calibration brightnesses.
• 2022-07-18: Instrument is operating nominally. The kcamera (slitviewer) shutter is still having intermittent failures but at less frequent intervals now we are in warmer weather. A small handful of instances which required restart of ICC software because of image write issues or exposures hanging. A user characterized the internal flat field lamps using the ND5 filter in filter wheel 2 and found lots of artifacts. We are discussing going back in again and adjusting the amount of ND material at the output of the integrating sphere for the Internal calibration brightnesses.
• 2022-07-11: Instrument is operating nominally. The kcamera (slitviewer) shutter is still having intermittent failures but at less frequent intervals now we are in warmer weather. A small handful of instances which required restart of ICC software because of image write issues or exposures hanging. A user characterized the internal flat field lamps using the ND5 filter in filter wheel 2 and found lots of artifacts. We are discussing going back in again and adjusting the amount of ND material at the output of the integrating sphere for the Internal calibration brightnesses.
• 2022-07-05: Instrument is operating nominally. The kcamera (slitviewer) shutter is still having intermittent failures but at less frequent intervals now we are in warmer weather. A small handful of instances which required restart of ICC software because of image write issues or exposures hanging. A user characterized the internal flat field lamps using the ND5 filter in filter wheel 2 and found lots of artifacts. We are discussing going back in again and adjusting the amount of ND material at the output of the integrating sphere for the Internal calibration brightnesses.
• 2022-06-27: Instrument is operating nominally. The kcamera (slitviewer) shutter is still having intermittent failures but at less frequent intervals now we are in warmer weather. A small handful of instances which required restart of ICC software because of image write issues or exposures hanging. A user characterized the internal flat field lamps using the ND5 filter in filter wheel 2 and found lots of artifacts. We are discussing going back in again and adjusting the amount of ND material at the output of the integrating sphere for the Internal calibration brightnesses.

• 2022-11-28: The instrument rotation has been restricted to less than its full range (rotator angle = -90 to +90) to reduce the number of resets required. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images.
• 2022-11-21: The instrument rotation has been restricted to less than its full range (rotator angle = -90 to +90) to reduce the number of resets required. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images.
• 2022-11-14: The instrument rotation has been restricted to less than its full range (rotator angle = -90 to +90) to reduce the number of resets required. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images.
• 2022-11-07: The instrument rotation has been restricted to less than its full range (rotator angle = -90 to +90) to reduce the number of resets required. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images.
• 2022-10-31: The instrument rotation has been restricted to less than its full range (rotator angle = -90 to +90) to reduce the number of resets required. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. Last night however there were a large cluster of corrupted images that required several resets and ICC resets to correct.
• 2022-10-24: The instrument rotation has been restricted to less than its full range to reduce the number of resets required. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-10-17: The instrument rotation has been restricted to less than its full range to reduce the number of resets required. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-10-10: The instrument rotation has been restricted to less than its full range to reduce the number of resets required. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-10-03: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-09-26: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-09-19: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-09-12: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-09-06: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-08-29: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-08-22: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-08-15: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-08-01: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-07-25: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-07-18: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-07-11: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-07-05: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.
• 2022-06-27: No change in the status. The instrument is performing nominally with the occasional need to reset the array controller due to corrupted images. These have been seen most often when the instrument is upside down. You may asked to rotate your field 180 degrees to minimize these events.

• 2022-11-28: The instrument is performing nominally.
• 2022-11-21: The instrument is performing nominally.
• 2022-11-14: The instrument is performing nominally.
• 2022-11-07: The instrument is performing nominally.
• 2022-10-31: The instrument is performing nominally.
• 2022-10-24: The instrument is performing nominally.
• 2022-10-17: The instrument is performing nominally.
• 2022-10-10: The instrument is performing nominally.
• 2022-10-03: The instrument is performing nominally.
• 2022-09-26: The instrument is performing nominally.
• 2022-09-19: The instrument is performing nominally.
• 2022-09-12: The instrument is performing nominally.
• 2022-09-06: The instrument is performing nominally.
• 2022-08-29: The instrument is performing nominally.
• 2022-08-22: The instrument is performing nominally.
• 2022-08-15: The instrument is performing nominally.
• 2022-08-01: The instrument is performing nominally.
• 2022-07-25: The instrument is performing nominally.
• 2022-07-18: The instrument is performing nominally.
• 2022-07-11: The instrument is performing nominally.
• 2022-07-05: The instrument is performing nominally.
• 2022-06-27: The instrument is performing nominally.

• 2022-11-28: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day.
• 2022-11-21: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day.
• 2022-11-14: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day.
• 2022-11-07: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day.
• 2022-10-31: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-10-24: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-10-17: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-10-10: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-10-03: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-09-26: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-09-19: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-09-12: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-09-06: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-08-29: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-08-22: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-08-15: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-08-01: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-07-25: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-07-18: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-07-11: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-07-05: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example
• 2022-06-27: The instrument is operating nominally. There has been the occasional need (becoming more frequent) to restart the ICC sofware each day. This occured again last night during checkout for example

The information on this page is up to date as of November 28, 2022. This page is maintained by the 3.5-m Telescope Engineer .