Apache Point Observatory 3.5m Telescope Night Log Monday, March 23, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- AP01 S.Merkowitz R.McMillan CU01 Z.Berta-Thompson Class CU01 Z.Berta-Thompson Class ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- AP01 APOLLO 19:26 19:18 CU01 KOSMOS 20:40 01:34 CU01 KOSMOS 01:50 06:40 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- AP01/R 19:26 20:26 0 0 0 0 0.0 1.0 0 0 CU01/R 20:26 01:10 0 0 0 0 0.1 4.6 0 0 CU01/R 01:10 06:53 2.8 0 0 0 2.9 0.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: H.Abbot,A.Townsend Dataq restart at the beginning of shift. Cloudy to start the night, but thin enough to observe through with bright targets. Cloud continued to 0200, but dust forced closure at 0245. Was able to reopen at 0530 for a few photons before sunrise. No telescope issues to report. ------- 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 -------------------------------------------------------------------------- 19:30 APOLLO 525( 2095) -65 59 13.3 14.7 14.5 13.8 13.0 530 2.00 20:51 kosmos 550( 1256) -11 57 12.8 12.8 13.5 12.6 12.5 -- 0.96 01:54 kosmos 563( 1232) -106 58 12.2 12.1 12.7 12.0 12.2 -- 1.08 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 61 21 11 256 (WSW) 2147 clear none 17:00 61 19 14 239 (WSW) 1754 clear none 18:00 62 23 10 220 (SW) 2776 clear none 19:00 57 23 8 234 (SW) 2899 mstly cldy none 20:00 56 17 15 256 (WSW) 1883 mstly cldy none 21:00 55 18 13 223 (SW) 1974 mstly cldy none 22:00 56 20 13 262 (W) 2841 mstly cldy none 23:00 56 20 10 262 (W) 3223 mstly cldy none 00:00 56 20 9 266 (W) 3211 mstly cldy none 01:00 55 20 8 267 (W) 3438 mstly cldy none 02:00 54 20 10 286 (WNW) 3846 clear none 03:00 53 21 9 271 (W) 4126 clear dust 04:00 53 22 15 321 (NW) 4419 clear dust 05:00 51 22 11 336 (NNW) 4605 clear dust 06:00 54 18 8 348 (NNW) 3162 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