Apache Point Observatory 3.5m Telescope Night Log Friday, August 07, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- UW02 J.Murtagh J.Murtagh JH01 G.Wang G.Wang,C.Wang ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- UW02 ARCTIC -- -- JH01 ARCTIC 03:20 05:50 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- UW02/R 20:05 01:10 5.1 0 0 0 0.0 0.0 0 0 JH01/R 01:10 06:13 0.3 1.5 0 0.3 0.0 3.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: T.McQuaid Reset the mirror covers at the start of night after they didn't open, working fine after. Stayed closed for heavy clouds and nearby storms during A half and the first half of B half. Wind started picking up shortly after midnight too and reached 40 mph gusts for a bit before it calmed back down around 02:00. Arctic exposures began failing at 00:30. restarting nubs didn't fix the issue, so since we were closed for weather anyways I did an arctic init which fixed the exposure issue but dropped the upper left quad. I performed a quad recovery, bringing it up to 200K and back down to 182K after the upper left quad was recovered. Arctic worked fine the rest of the night. The radar cleared out and I opened at 03:00, though arctic didn't finish cooling until 03:20 when we started on sky. Did a quick, rough manual focus since we were using the diffuser. Rest of the night was smooth sailing. ------- FAILURE LOG ------- FAILURE MODE TIME PROG INSTR TI/SHU START FINISH DESCRIPTION ---------------------------------------------------------------------- JH01 ARCTIC I/S 00:30 03:20 ARCTIC Exposure Failure/arctic init recovery ---------------- FOCUS LOG --------------- Time Instrument Focus Az El Temp Strc Prim Sec Air filt FWHM -------------------------------------------------------------------------- 03:33 arctic 302( 1176) 52 30 14.9 15.9 17.4 15.4 15.1 sdss_g 3.20 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 69 47 2 145 (SE) 2708 cloudy None 17:00 68 47 5 158 (SSE) 2628 cloudy None 18:00 64 37 16 11 (N) 1034 cloudy rain 19:00 63 38 10 58 (ENE) 1308 cloudy rain 20:00 67 37 1 240 (WSW) 1907 cloudy none 21:00 66 33 7 6 (N) 1471 cloudy none 22:00 65 41 6 90 (E) 2132 cloudy none 23:00 64 42 19 75 (ENE) 2567 cloudy none 00:00 61 41 26 77 (ENE) 2109 ptly cldy none 01:00 56 43 26 66 (ENE) 1765 ptly cldy none 02:00 57 33 20 76 (ENE) 2162 ptly cldy none 03:00 60 32 10 45 (NE) 2672 ptly cldy none 04:00 58 26 7 263 (W) 1818 clear none 05:00 54 32 8 293 (WNW) 2020 clear none 06:00 57 31 4 276 (W) 1742 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: