Apache Point Observatory 3.5m Telescope Night Log Monday, January 05, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- UW06 C.Chandler C.Chandler DD02 C.Gray D.Demars,S.Monty,C.Gray ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- UW06 ARCTIC 17:50 00:05 DD02 TSPEC 00:20 04:12 DD02 ECHELLE 04:16 06:42 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- UW06/R 17:20 00:10 0 0 0 0 2.6 4.2 0 0 DD02/R 00:10 06:58 0 0 0 0 0.0 6.8 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: T.Sutherland Dome cals were being taken at the start of the night, which delayed opening. Consistent clouds through the night, but we were able to get some decent data. No echelle IOL this morning, cals were being taken. 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 -------------------------------------------------------------------------- 17:57 arctic 423( 880) 102 76 3.5 5.5 5.7 5.4 3.6 SDSS_r 1.04 19:29 arctic 419( 780) 1 70 3.3 3.5 4.0 3.2 3.1 SDSS_r 0.82 00:25 tcamera 514( 939) -88 43 2.7 1.3 2.5 2.0 2.5 -- 0.97 03:33 tcamera 467( 835) 39 74 1.1 0.5 1.4 0.6 0.9 -- 0.94 04:23 ecamera 467( -405) 67 47 1.4 0.4 1.2 0.5 1.0 ND2 0.99 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 41 13 14 274 (W) 214 ptly cldy none 17:00 40 15 20 279 (W) 226 ptly cldy none 18:00 38 18 15 271 (W) 297 ptly cldy none 19:00 38 22 13 265 (W) 358 ptly cldy none 20:00 38 22 16 273 (W) 353 mstly cldy none 21:00 37 22 15 267 (W) 329 mstly cldy none 22:00 37 11 21 285 (WNW) 558 ptly cldy none 23:00 37 11 14 263 (W) 1543 ptly cldy none 00:00 36 11 15 284 (WNW) 1711 ptly cldy none 01:00 36 14 12 288 (WNW) 844 ptly cldy none 02:00 35 23 19 299 (WNW) 509 ptly cldy none 03:00 34 22 12 321 (NW) 460 mstly clr none 04:00 34 19 17 308 (NW) 356 mstly clr none 05:00 35 15 13 305 (NW) 301 mstly clr none 06:00 36 13 18 321 (NW) 297 mstly clr 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