Apache Point Observatory 3.5m Telescope Night Log Wednesday, December 17, 2025 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- UW01 S.Hawley L.Hebb UW02 P.Yoachim D.Meng,Z.Xu NM03 T.McQuaid T.McQuaid ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- UW01 ARCTIC 15:17 22:05 UW02 KOSMOS 22:19 00:58 NM03 ECHELLE 01:02 04:48 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- UW01/R 17:08 22:10 0 0 0 0 5.0 0.0 0 0 UW02/R 22:10 00:10 0 0 0 0 2.0 0.0 0 0 UW02/R 00:10 01:10 0 0 0 0 1.0 0.0 0 0 NM03/R 01:10 06:51 1 0.9 0 0 3.8 0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: T.Sutherland Some wind early in the morning and it forced us to close at 04:48. We called it at 05:30. No telescope or instrument problems tonight. ------- 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 -------------------------------------------------------------------------- 17:43 arctic 499( 1091) 108 82 7.0 8.5 8.5 8.2 6.6 SDSS_i 1.05 22:31 kosmos 499( 900) -54 45 7.0 6.2 6.8 6.2 6.8 -- 1.11 01:06 ecamera 475( -124) 289 65 7.0 6.5 7.0 6.5 6.9 clear 1.29 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 43 11 5 339 (NNW) 232 clear none 17:00 43 11 13 313 (NW) 209 clear none 18:00 42 12 11 290 (WNW) 225 clear none 19:00 43 14 17 293 (WNW) 418 clear none 20:00 43 14 9 267 (W) 365 clear none 21:00 44 16 15 311 (NW) 425 clear none 22:00 46 18 8 354 (N) 238 clear none 23:00 44 18 9 350 (N) 316 clear none 00:00 45 19 17 7 (N) 202 clear none 01:00 45 19 9 2 (N) 179 clear none 02:00 43 18 2 166 (SSE) 269 clear none 03:00 43 18 10 16 (NNE) 309 clear none 04:00 42 18 14 350 (N) 315 clear none 05:00 42 18 10 3 (N) 331 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