Apache Point Observatory 3.5m Telescope Night Log Saturday, August 15, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- UW03 F.ChabourBarra F.ChabourBarra UW06 C.Chandler M.Frissell ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- UW03 KOSMOS 22:41 00:30 UW06 ARCTIC 00:44 05:35 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- UW03/R 19:57 01:10 1.1 1.1 0 0.5 2.5 0 0 0 UW06/R 01:10 06:19 0 0 0 0 5.1 0.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: T.Sutherland Lots of storms/radar kept us closed for a while. Opened up just after 22:30. Skies were clear the rest of the night. UW03 finished early as last target was too low to observe, so the remaining time was yielded to UW06. Failed: echelle mirror lam... failed: error from motor controller: '\x15[Invalid Command]\r>' Error occurred when it was echelle's turn in the inst checkout script. Commanded cal mirror to lamps manually and reran script and it was fine. Arctic LL quad saturated at checkout and mostly saturated for science in B-half. But we made it work! Did a `set imcenter=(2800,2800)` to have the UW06 targets centered in the UR quad in quad mode. Tert amplifier fault at checkout when setting inst to kosmos. Thank you Cary and Bill for the help. The telescope was operational enough for tonight, but not totally fixed. Tert Rot in the Enclosure window of TUI is still a ?. PR IRSC/2306 for the infrared sky cam was submitted due to odd horizontal banding. Problem seemed to clear itself after the PR was made. Dan and I are both confused. Motion error at about 50deg alt while user was slewing telescope down at 1:50am. ------- FAILURE LOG ------- FAILURE MODE TIME PROG INSTR TI/SHU START FINISH DESCRIPTION ---------------------------------------------------------------------- UW03 Kosmos T/H 19:57 20:30 Tertiary Amplifier Fault ---------------- FOCUS LOG --------------- Time Instrument Focus Az El Temp Strc Prim Sec Air filt FWHM -------------------------------------------------------------------------- 22:57 kosmos 340( 1253) 92 60 15.7 17.2 18.3 17.0 15.9 -- 1.40 01:03 arctic 400( 1247) -24 39 15.5 15.6 16.2 15.3 15.6 CUVR 1.14 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 74 48 7 233 (SW) 974 mstly cldy lt rain 17:00 69 47 10 262 (W) 835 mstly cldy none 18:00 71 46 11 277 (W) 796 mstly cldy none 19:00 67 46 9 226 (SW) 1056 mstly cldy none 20:00 63 46 11 152 (SSE) 932 mstly cldy none 21:00 61 46 14 146 (SE) 809 ptly cldy none 22:00 61 48 5 111 (ESE) 1085 mstly clr none 23:00 60 47 6 114 (ESE) 1029 mstly clr none 00:00 61 46 11 202 (SSW) 990 clear none 01:00 60 45 6 188 (S) 796 clear none 02:00 61 45 5 188 (S) 908 clear none 03:00 62 45 4 190 (S) 859 clear none 04:00 61 44 3 259 (W) 848 clear none 05:00 62 45 3 299 (WNW) 989 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: 3.2.2