Apache Point Observatory 3.5m Telescope Night Log Sunday, June 21, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- UW10 A.Heinze A.Heinze EN01 B.Ketzeback A.Townsend,R.McMillan ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- UW10 ECHELLE 20:35 01:10 EN01 ARCTIC 01:14 05:34 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- UW10/R 20:23 01:10 0 0 0 0 0.1 4.7 0 0 EN01/W 01:10 05:47 0 0 0 0 4.6 0.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: A.Townsend ARCTIC LL saturated at checkout; fully recovered by 20:50. Engineering tasks accomplished: - ARCTIC UR mode testing - ur_arctic instrument block - Checks of ul_arctic and lr_arctic - Subframing and orientation checks - Throughput for 3 fields at the end of the night (SA109-71, SA110-232, S113-339) Beautiful night, mostly photometric with decent seeing! ------- 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 -------------------------------------------------------------------------- 20:41 ecamera 654( 803) 117 33 20.9 21.8 22.1 21.1 20.4 ND3 1.16 23:32 ecamera 494( 508) 34 36 19.2 19.1 19.9 18.7 19.2 Clear 1.36 01:26 arctic 454( 1517) 66 56 18.5 18.3 19.1 18.2 18.7 SDSS_g 1.10 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 80 34 7 259 (W) 940 clear none 17:00 77 33 15 278 (W) 1426 clear none 18:00 77 31 24 269 (W) 1214 clear none 19:00 75 28 15 265 (W) 972 clear none 20:00 71 27 16 262 (W) 1032 clear none 21:00 68 28 17 234 (SW) 1141 clear none 22:00 67 27 14 259 (W) 1116 clear none 23:00 67 25 12 262 (W) 967 clear none 00:00 67 22 13 264 (W) 814 clear none 01:00 66 22 12 281 (W) 823 clear none 02:00 65 19 13 298 (WNW) 911 clear none 03:00 64 18 13 301 (WNW) 962 clear none 04:00 62 17 2 298 (WNW) 791 clear none 05:00 62 17 5 347 (NNW) 796 clear none 06:00 64 12 14 30 (NNE) 751 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: