Subject: 3.5m Night Log 20250804 From: mcroom@apo.nmsu.edu Date: Tue, 05 Aug 2025 13:06:40 +0000 (UTC) Apache Point Observatory 3.5m Telescope Night Log Monday, August 04, 2025 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- UW08 C.Chandler C.Chandler,D.Singh UW03 P.Yoachim DezhengMeng WY01 M.Moe C.Smith ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- UW08 KOSMOS 21:00 01:15 UW03 KOSMOS 01:15 02:24 WY01 KOSMOS 02:24 05:10 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- UW08/R 20:07 01:10 0 0 0 0 0.0 5.1 0 0 UW03/R 01:10 02:30 0 0 0 0 0.0 1.3 0 0 WY01/R 02:30 06:12 0 0 0 0 3.7 0.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: M.Croom Remote support from Russet. Good weather conditions; we were open all night long. The all-sky camera froze in the afternoon. Following the Day Log request, no recovery action was taken so the error logs should be intact. Restarted the dataq. The s/w off-on approach was successful (like last night). A single Motion Error in Alt occurred during the initial test slew while moving from the 70-degree park position. The error hit at alt=57, commanded to 40. Axis stop/init and re-slew recovered the error. More Motion Errors occurred in Alt while observing: During UW08 (A Half) while slewing in the downward direction. During UW03 (early B Half) also while going downward. The same recovery actions cleared the error. Lost communication with rot1 while guiding on a non-sidereal target with KOSMOS (but had been doing that for most of A Half). Russet reset the rotator. UW03 completed their last exposure with 6 minutes to spare, so WY01 took over a bit early. ------- 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 -------------------------------------------------------------------------- 22:28 kosmos 475( 1536) -29 35 20.5 21.1 21.6 20.5 20.8 - 2.06 02:36 kosmos 500( 1437) -14 57 19.6 18.8 19.4 18.7 19.3 - 1.37 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 79 39 12 241 (WSW) 875 mstly cldy none 17:00 76 30 9 237 (WSW) 676 ptly cldy none 18:00 77 28 5 263 (W) 578 mstly clr none 19:00 74 25 8 286 (WNW) 546 clear none 20:00 69 21 6 262 (W) 532 clear none 21:00 69 19 4 247 (WSW) 469 clear none 22:00 69 19 2 188 (S) 517 clear none 23:00 69 18 7 181 (S) 445 clear none 00:00 68 27 12 165 (SSE) 718 clear none 01:00 69 25 15 163 (SSE) 648 clear none 02:00 66 39 13 182 (S) 1316 mstly clr none 03:00 67 33 8 187 (S) 1052 clear none 04:00 64 37 1 185 (S) 1202 clear none 05:00 68 23 6 231 (SW) 650 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