Date: Sun, 31 May 1998 06:03:47 -0600 (MDT) From: Tia Hoyes Subject: 3.5m obslog 980530 SATURDAY MAY 30, 1998 APACHE POINT OBSERVATORY OBSERVING LOG ACTUAL ASTRONOMER OBSERVER INSTRUMENT DATE START FINISH York Richards DIS 5/30 18:40 05:10 INST SCHEDULED OBS WEATH EQUIP DAY NOTUSED I/RS/DN START FINISH D B D B D B USE D B UC02/R 21:44 04:17 3.8 3.8 0 0 0 0 0 0 0 (note: times listed include instrument change time) ACTIVITY LOG The telescope was open tonight at 18:40. Gordon Richards had the entire night. Comments:Great night. Nearly perfect. A total of 17,400 seconds of actual exposure time on our QSO absorption line targets. For those interested in this sort of thing, here's the read noise values for the DIS chips over the past week or so: Date Blue RN (e-) Red RN (e-) 21 May 12.07 30.88 26 May 12.37 30.83 29 May 12.18 26.52 30 May 12.13 27.02 31 May 11.77 26.09 All were calculated in exactly the same manner with the same set of subarrays on the chips, making sure to reject CR hits. I took the gain to be 0.98 e/ADU and 1.96 e/ADU for the blue and red chips respectively. Gordon (* means a trouble report has been issued or appended to) FOCUS LOG MAY 30, 1998 Best Telescope Wind Seeing Time Inst Focus Az El Temp# Dir MPH filter FWHM " 21:15 SLIT -250(6509) 63.8 81.7 16.3/16.85 265.1 15.8 empty ---- # The first temp is air, the second is truss, both in degrees C. *Due to calibrations in spectral mode, we were not able to image for focus. These were best guess values based on slit viewer. WEATHER MAY 30, 1998 Wind Time Temp F Dewp. MPH. Dir. DUST Sky Precip. 16:01 70 16 18 242 (WSW) 1374 cirrus none 17:01 64 15 17 258 (WSW) 1613 cirrus none 18:01 65 15 19 261 (W) 1429 cirrus none 19:01 64 15 19 242 (WSW) 1452 cirrus none 20:01 61 16 15 246 (WSW) 1631 cirrus none 21:01 61 15 15 256 (WSW) 1835 cirrus none 22:01 59 13 15 270 (W) 1633 cirrus none 23:01 60 15 15 267 (W) 1491 cirrus none 00:01 59 16 12 265 (W) 1462 cirrus none 01:01 58 16 11 267 (W) 1604 light clouds none 02:01 57 14 15 283 (WNW) 1330 clearing none 03:01 57 14 7 273 (W) 1368 clear none 04:01 56 10 18 300 (WNW) 1204 light cirrus none 05:01 55 8 14 294 (WNW) 835 clearing none note: the wind was coming from the azimuth listed. The convention used is north=0 degrees, east=90 degrees. The dust count is particles >1 micron per 0.1 cu. ft. TELESCOPE STATUS Primary, secondary, and tertiary mirrors in place and collimated. Primary support system operational. Mirror ventilation system in place. Telescope drives operational. Current Remark version: 2.41 Current guide software version:GIm Ctrl v3.0b 15.out -Tia