Subject: 3.5m Night Log 20251207 From: ajt@apo.nmsu.edu Date: Mon, 8 Dec 2025 14:08:51 +0000 (UTC) Apache Point Observatory 3.5m Telescope Night Log Sunday, December 07, 2025 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- GS02 D.Gies D.Gies&Class JH05 C.Lisse C.Ingebretsen,C.Lisse,M.Belyakov ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- GS02 ECHELLE 17:32 00:09 JH05 ARCTIC 00:13 01:30 JH05 KOSMOS 01:50 04:37 JH05 ARCTIC 04:49 06:30 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- GS02/O 17:06 00:10 0 0 0 0 2.9 4.2 0 0 JH05/T 00:10 06:45 0 0 0 0 0.0 6.6 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: A.Townsend We had a photometric night with pretty good seeing! ThAr lamp intermittent, problem seems to be related to the power supply. It also seems not to have recovered by the end of the night, but observers had a little bit of success by taking longer exposures to get enough lines for calibration purposes. See PR2271. KOSMOS colfoc was at 0 today, I reset it to 2000. Checkout images have colfoc=0 since Dec 2nd, which seems to account for the oddly low secondary focus the one time we were on sky with KOSMOS since then. When I went upstairs to swap instruments at 01:45 the ARCTIC ion pump had stopped again. I tried restarting HV without success. At 03:11 the observers stopped a KOSMOS exposure and were unable to take another, there were "not connected to torrent" errors and "bias failed" when I tried to take a test exposure. All I had to do was a kosmos conndev to get us going again, though. ------- FAILURE LOG ------- FAILURE MODE TIME PROG INSTR TI/SHU START FINISH DESCRIPTION ---------------------------------------------------------------------- ---------------- FOCUS LOG --------------- Time Instrument Focus Az El Temp Strc Prim Sec Air filt FWHM -------------------------------------------------------------------------- 17:39 ecamera 540( -113) 274 45 3.2 5.0 4.2 4.5 3.5 ND3 0.83 00:24 arctic 476( 736) -144 45 3.1 1.0 2.2 1.5 2.5 SDSS_r 1.22 01:58 kosmos 490( 682) -124 35 3.4 1.6 3.0 2.6 3.0 -- 1.16 04:55 arctic 472( 736) 41 53 3.2 1.2 2.6 1.9 2.1 SDSS_r 1.35 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 40 12 1 228 (SW) 186 clear none 17:00 41 9 8 45 (NE) 199 clear none 18:00 35 2 6 7 (N) 198 clear none 19:00 36 -7 13 14 (NNE) 141 clear none 20:00 37 -10 16 5 (N) 203 clear none 21:00 37 -4 7 13 (NNE) 228 clear none 22:00 36 4 10 21 (NNE) 205 clear none 23:00 36 5 11 35 (NE) 234 clear none 00:00 37 4 9 354 (N) 229 clear none 01:00 38 3 9 325 (NW) 218 clear none 02:00 38 5 8 10 (N) 189 clear none 03:00 39 2 9 351 (N) 224 clear none 04:00 38 1 11 327 (NNW) 214 clear none 05:00 37 0 10 343 (NNW) 221 clear none 06:00 36 -2 3 344 (NNW) 221 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 > 1u per 0.1 cubic feet. ---------- TELESCOPE SOFTWARE ---------- Current TCC version: 1.4.2 Current HUB version: v20171231_01 Current TUI version: 3.1.8