Apache Point Observatory 3.5m Telescope Night Log Friday, July 10, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- UW03 F.Chabour F.Chabour BY04 E.Hintz G.Steed, S.Richmond ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- UW03 KOSMOS --:-- --:-- BY04 TSPEC 02:35 05:05 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- UW03/R 20:23 01:10 4.8 0 0 0 0.0 0.0 0 0 BY04/R 01:10 05:55 1.4 0.0 0 0 0.1 3.2 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: J.Dembicky ARCTIC LL Quad 12:44UT dome temp 25.0C, louvers opened and fans on, LL quad 65300 01:37UT dome temp 23.4C, louvers opened and fans on, slight change mostly 65300 still 02:24UT dome temp 22.2C, louvers closed and fans on, improvement but still bad 02:24UT dome temp 21.0C, louvers open and fans on, mostly normal except very left edge still 63500 I delayed opening the dome early since my observer was doing truss cals. We also had precipitation just to our N and clouds forming over us coming from the N. Sever power flickers tonight. Not sure why, it was not too windy but we did have lightning from a storm to our west. We finally lost site power at 23:55 and went to generator power. 00:01 back on mains power. We finally opened around 02:30. ------- 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 -------------------------------------------------------------------------- 02:45 tcamera 501( 1711) 111 59 17.7 18.2 18.7 18.1 17.5 Ks 1.21 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 72 33 5 153 (SSE) 469 mstly clr none 17:00 72 33 10 92 (E) 738 mstly clr none 18:00 72 33 13 94 (E) 1457 mstly clr none 19:00 72 33 12 144 (SE) 1322 ptly cldy none 20:00 68 32 14 128 (SE) 1430 mstly cldy none 21:00 68 32 13 113 (ESE) 1489 cloudy lt rain 22:00 65 32 19 81 (E) 836 cloudy none 23:00 65 32 9 35 (NE) 1096 cloudy none 00:00 64 32 9 356 (N) 1039 cloudy none 01:00 65 31 12 164 (SSE) 834 cloudy none 02:00 65 32 17 147 (SSE) 1479 mstly clr none 03:00 65 31 4 151 (SSE) 1689 mstly clr none 04:00 63 31 9 114 (ESE) 2009 ptly cldy none 05:00 63 31 5 78 (ENE) 1893 ptly cldy 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: