Apache Point Observatory 3.5m Telescope Night Log Tuesday, May 12, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- NM07 T.McQuaid T.McQuaid UW01 P.Yoachim Z.Xu,Z.Liu,D.Meng NM03 K.Sanderson K.Sanderson ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- NM07 ECHELLE 20:18 22:24 UW01 KOSMOS 22:32 00:46 NM03 KOSMOS --:-- --:-- PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- NM07/R 20:02 22:36 0 0 0 0 2.6 0.0 0 0 UW01/R 22:36 01:10 0.4 0 0 0 2.2 0.0 0 0 NM03/R 01:10 05:57 2.5 2.3 0 0 0.0 0.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: H.Abbot,J.Dembicky,R.McMillan ARCTIC filter wheel stuck homing during afternoon checkout. Restarted arcticFilterWheel controller to bring it back online. ARCTIC also had an issue where LL quad had many saturated values in the test bias images. It seemed to recover itself a few hours into the night, but since the cause was not understood, a PR was submitted on the issue. Echelle fill sequence ran for an excessively long time, from before afternoon checkouts through to about 0130. More details provided in a separate PR. Instrument was otherwise well behaved during checkout and observing. Had a tracking error moving the telescope down. Reinitialised the alt axis, slewed through the magnet sensors a few times, and everything seemed normal. Otherwise a clear night with good seeing. Closed at 00:46 due to pollen count spiking and wasn't able to reopen for the rest of the night. NM07 finished early and donated rest of time to UW01. ------- 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 -------------------------------------------------------------------------- 20:26 ecamera 517( 567) 150 77 16.8 20.4 19.4 20.3 17.4 Clear 1.04 22:48 kosmos 482( 1364) 11 59 16.7 16.6 17.0 16.3 16.6 -- 0.90 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 70 30 10 268 (W) 2054 mstly clr none 17:00 75 30 12 231 (SW) 2066 ptly cldy none 18:00 69 27 5 225 (SW) 1971 ptly cldy none 19:00 68 27 10 196 (SSW) 1981 mstly clr none 20:00 63 26 5 217 (SW) 1987 clear none 21:00 62 27 8 185 (S) 2056 clear none 22:00 62 25 12 170 (S) 1886 clear none 23:00 62 21 16 151 (SSE) 1583 clear none 00:00 61 17 16 155 (SSE) 1778 clear none 01:00 60 21 19 154 (SSE) 2021 clear none 02:00 58 26 18 157 (SSE) 2040 clear none 03:00 58 27 18 155 (SSE) 2192 clear none 04:00 59 27 19 156 (SSE) 1934 ptly cldy none 05:00 59 25 19 177 (S) 1737 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