Date: Sun, 18 Jan 1998 06:30:47 -0700 (MST) From: Tia Hoyes Subject: 3.5m obslog 980117 SATURDAY JANUARY 17, 1998 APACHE POINT OBSERVATORY OBSERVING LOG ACTUAL ASTRONOMER INSTRUMENT DATE START FINISH Bohm GRIM2 1/17 17:20 06:03 Turner DIS 1/17 ----- ----- INST SCHEDULED OBS WEATH EQUIP DAY NOTUSED I/RS/DN START FINISH D B D B D B USE D B UW12/R 18:48 00:10 3.4 2.0 0 0 0 0 0 0 0 UW04/R 00:10 00:25 0 0 0 0 0 0 0 0 0.3 UW12/R 00:25 05:00 0 4.6 0 0 0 0 0 0 0 PU01/S 05:00 05:39 0 0 0 0 0 0.7 0 0 0 (note: times listed include instrument change time) ACTIVITY LOG (* means a trouble report has been issued or appended to) The telescope was opened at 18:40. Dis was worked on by Karen Gloria and Craig Loomis this afternoon, and the slit wheel problem was corrected. Notes:I turned the slit mask wheel by hand and heard it scraping against the shutter. I took the wheel out and found that the screws on the UW08 slit masks were sticking out too far. Also, there are some faint scrape marks on the shutter. I tested the slit wheel and shutter with those masks removed and they both worked fine (checked that the wheel didn't scrape the shutter when turned by hand and when turned by the DIS motors, homed the wheel and sent it to various positions, took exposures with the wheel in various positions). I reversed the screws on the UW08 masks (so that the head of each screw was facing the back of the wheel, instead of the end - which sticks out a bit farther). I tested the wheel and shutter with the slit masks (screws reversed) back in and they worked fine. When I was turning the screws around, I noticed the indentations (made by the locking washers) on the front of the slit mask holders. This makes me think the screws used to be in with the ends on the top (the way they are now). This might explain why this problem didn't occur the last time these masks were here. Alberto Noriega-Crespo and Karl-Heinz Bohm were the observers for the night using GRIMII. After a slow start because Alberto had some trouble with REMARK, things ran smoothly. There were some clouds for a good 80% of the time, but at the end of the night it was clear. A minor note. It seems that the orientation of the camera (the position angle), was off by some 10-15 degrees with respect the N-S direction. The night before was even more off( about 45 degrees); first we thought we just were not understanding the N-E diagram, but it was OBVIOUS that the position angle was different from one night to the next (we observed the same object) Last, but not least, Tia was again fantastic helping us in every detail. It is a pleasure to work with her support. I could not observe for Lens Monitoring because the temperature on the cameras for DIS were BLUE:-3.4C and RED:0.0C. I discovered this approximately 5 minutes prior to changing the instruments. I decided it best to let Alberto use the Lens Monitoring time, so as it not go to waste. He observed until 6:03 am. FOCUS LOG JANUARY 17, 1998 Best Telescope Wind Seeing Time Inst Focus Az El Temp# Dir MPH filter FWHM " 18:50 GRIM2 +100(6449) 129.3 75.9 3.3/4.7 299.8 14.4 2.122 0.97 22:30 GRIM2 -75(6262) 197.1 49.2 1.7/2.24 12.2 4.6 2.122 1.27 00:35 GRIM2 -85(6141) 345.8 72.5 1.6/1.58 330.4 19.7 J 1.19 01:30 GRIM2 -85(6150) 323.5 67.5 1.4/1.46 334.1 7.4 H 1.34 02:05 GRIM2 -50(6177) 316.4 62.9 1.5/1.44 19.2 6.8 K 1.34 03:15 GRIM2 -50(6183) 101.1 60.4 0.8/0.95 355.3 20.4 J 1.26 03:50 GRIM2 -50(6143) 109.4 67.5 0.6/0.6 351.3 14.4 K 1.4 # The first temp is air, the second is truss, both in degrees C. WEATHER JANUARY 17, 1998 Wind Time Temp F Dewp. MPH. Dir. DUST Sky Precip. 16:01 38 26 17 302 (WNW) 195 cirrus none 17:01 38 26 17 307 (NW) 182 cirrus none 18:01 38 25 20 312 (NW) 178 cirrus none 19:01 37 24 13 297 (WNW) 180 cirrus none 20:01 38 23 15 333 (NNW) 116 cirrus none 21:01 37 21 16 358 (N) 123 cirrus/murky none 22:01 36 21 8 299 (WNW) 92 light clouds none 23:01 35 22 12 316 (NW) 78 cirrus none 00:01 35 21 10 358 (N) 73 clearing none 01:01 35 21 3 340 (NNW) 106 clear none 02:01 35 21 9 328 (NNW) 97 clear none 03:01 33 22 2 7 (N) 92 clear none 04:01 33 22 12 338 (NNW) 85 clear none 05:01 32 21 15 23 (NNE) 118 mostly clear none 06:01 32 19 20 12 (NNE) 133 mostly clear 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: 2.36 Current guide software version:GIm Ctrlv3.0b11. -Tia