Apache Point Observatory 3.5m Telescope Night Log Sunday, December 21, 2025 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- UW02 P.Yoachim Z.Xu, Z.Liu GS04 S.Lepine Z.Way UW03 C.Chandler C.Chandler, D.Singh ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- UW02 KOSMOS 17:10 20:00 GS04 ECHELLE 20:05 00:00 UW03 ARCTIC 00:20 06:19 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- UW02/R 17:10 20:10 0 0 0 0 1.6 1.4 0 0 GS04/R 20:10 00:10 0 0 0 0 4.0 0.0 0 0 UW03/R 00:10 06:54 0 0 0 0 6.7 0.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: J.Dembicky At around 01:44UT we had a rotator motion error. Unfortunately I didn't cathc the error in the status window (nothing was showing in the log window) until the observations finished. I do not recall hearing a beep in TUI at the time either. I was in the chat window with the 2nd observer giving them permission to use the echelle about the time the error happened, so I was in the control room at the time. If it happens again, probably a controller reset may be in order. I will keep an eye on it with ARCTIC later tonight. No rotator problem 2nd half. No telescope issues. ------- 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 -------------------------------------------------------------------------- 18:00 kosmos 525( 1094) -91 63 9.6 10.0 10.2 9.7 9.4 -- 0.79 20:09 ecamera 400( -103) -6 58 8.7 8.4 8.9 7.9 8.0 ND1 0.95 00:25 arctic 418( 982) 209 65 9.0 7.8 8.5 7.7 8.1 CUVR 0.75 00:26 NA2gdr 35274(35274) 210 65 9.1 7.8 8.5 7.7 8.1 clear 0.95 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 52 23 5 240 (WSW) 163 clear none 17:00 50 17 6 258 (WSW) 50 clear none 18:00 49 17 5 259 (W) 47 clear none 19:00 47 18 5 277 (W) 42 clear none 20:00 48 20 7 302 (WNW) 49 clear none 21:00 47 20 6 269 (W) 95 clear none 22:00 49 21 6 267 (W) 135 clear none 23:00 49 21 4 258 (WSW) 131 clear none 00:00 49 20 8 254 (WSW) 117 clear none 01:00 47 21 7 230 (SW) 117 clear none 02:00 48 20 8 248 (WSW) 128 clear none 03:00 48 15 8 262 (W) 101 clear none 04:00 48 14 12 273 (W) 72 clear none 05:00 48 16 11 265 (W) 123 clear none 06:00 48 16 12 271 (W) 117 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