Apache Point Observatory 3.5m Telescope Night Log Tuesday, January 13, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- OU04 M.Kilic G.Jewett DD02 D.Time C.Gray,T.Beck,D.Demars,R.Klement,S.Monty AP01 S.Merkowitz R.McMillan ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- OU04 ARCTIC 17:27 00:08 DD02 ARCTIC 00:12 02:07 DD02 TSPEC 02:25 03:25 DD02 ECHELLE 03:27 05:17 AP01 APOLLO -- -- PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- OU04/R 17:27 00:10 0 0 0 0 6.7 0.0 0 0 DD02/R 00:10 05:57 0 0.7 0 0 3.6 1.5 0 0 AP01/R 05:57 06:57 0 1.0 0 0 0.0 0.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: T.McQuaid Most of the night was uneventful, although seeing was highly variable. Swapped to Tspec at 02:07, and swapped to echelle at 03:25. Closed for wind at 05:17 and stayed closed the rest of night. ------- 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 -------------------------------------------------------------------------- 18:16 arctic 543( 951) -89 71 3.5 4.5 4.7 4.2 3.6 BG40 A1 0.90 18:24 NA2gdr 36785(36785) -117 69 3.8 4.3 4.5 4.0 3.6 R 1.24 00:48 arctic 521( 813) -39 51 4.1 1.8 3.4 2.7 3.4 SDSS_r 1.89 02:56 tcamera 514( 1025) 28 68 4.0 3.5 4.1 3.7 3.7 -- 1.26 03:48 ecamera 465( -280) 170 52 2.9 3.2 3.8 3.1 3.0 ND2 3.62 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 43 12 7 39 (NE) 251 clear none 17:00 40 11 6 7 (N) 235 clear none 18:00 39 8 15 352 (N) 88 clear none 19:00 38 14 18 357 (N) 148 clear none 20:00 39 10 15 359 (N) 101 clear none 21:00 40 9 17 2 (N) 57 clear none 22:00 38 13 18 360 (N) 122 clear none 23:00 38 14 21 21 (NNE) 136 clear none 00:00 38 16 21 34 (NE) 142 clear none 01:00 40 14 22 31 (NNE) 100 clear none 02:00 41 14 15 31 (NNE) 73 clear none 03:00 40 12 16 110 (ESE) 87 clear none 04:00 38 14 13 80 (E) 102 clear none 05:00 35 15 31 77 (ENE) 929 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