Subject: 3.5m Night Log 20251211 From: dembicky@apo.nmsu.edu Date: Fri, 12 Dec 2025 13:28:11 +0000 (UTC) Apache Point Observatory 3.5m Telescope Night Log Thursday, December 11, 2025 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- UW03 C.Chandler C.Chandler, M.Frissell CU04 J.Sebastian J.Sebastian ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- UW03 ARCTIC 17:06 00:02 CU04 KOSMOS 00:15 06:12 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- UW03/R 17:06 00:10 0 0 0 0 7.1 0.0 0 0 CU04/R 00:10 06:48 0 0 0 0 0.1 6.6 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: J.Dembicky Checkout ThAt echelle image was bad. Faint lines again. I took a second image and made sure that the ThAr Lamps was on (in widget). 2nd image bad as well. Alt Motion error downward initial slew @29.7 deg from 71 deg alt. I took an Echelle ThAr lamp at 21:25 and it was still bad. I then took a second image and checked the voltage on the intermediate level (red LEDs) and they were reading 0.00 while the lamps was showing on in the Echelle widget. ThAr lamps still not working at the end of the night. I turned on the lamp in the dome when I closed and read the meter on the Int level, it was reading -00.6 (which actually might have been what it was reading earlier too, I just saw the zero's when looking at it from the stairs earlier). I took a slitview image and I could see light in that image. The cal was bad (dim), as expected. No telescope issues and a clear night with wind and so so seeing. ------- 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 -------------------------------------------------------------------------- 17:34 arctic 486( 1250) -78 76 10.3 12.2 12.1 11.6 10.5 CUVR 1.00 18:09 NA2gdr 37503(37503) 15 64 9.9 11.0 11.4 10.5 10.1 clear 1.39 00:26 khigh 500( 984) -24 55 8.7 8.1 8.8 8.1 8.3 -- 1.40 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 52 15 12 354 (N) 137 clear none 17:00 52 17 13 31 (NNE) 118 clear none 18:00 51 17 13 20 (NNE) 124 clear none 19:00 50 17 18 37 (NE) 139 clear none 20:00 50 17 18 16 (NNE) 134 clear none 21:00 48 18 20 22 (NNE) 119 clear none 22:00 48 18 16 15 (NNE) 222 clear none 23:00 48 17 34 25 (NNE) 176 clear none 00:00 47 15 26 23 (NNE) 92 clear none 01:00 47 11 24 11 (N) 108 clear none 02:00 48 7 23 42 (NE) 63 clear none 03:00 48 8 24 66 (ENE) 134 clear none 04:00 47 9 19 67 (ENE) 141 clear none 05:00 46 9 20 72 (ENE) 133 clear none 06:00 45 10 19 75 (ENE) 95 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