Apache Point Observatory 3.5m Telescope Night Log Thursday, February 19, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- JH07 T.Beck T.Beck,C.Gray OU02 Sameer Sameer ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- JH07 ARCTIC 18:47 22:21 OU02 KOSMOS 00:22 01:24 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- JH07/R 18:01 00:10 0 0 0 0 3.7 2.4 0 0 OU02/R 00:10 06:33 0 0 0 0 6.4 0.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: A.Townsend JH07 NICFPS 22:35 00:00 OU02 KOSMOS 03:17 05:53 OU02 KOSMOS 05:33 Power cycled dataq because it was frozen Motion error on first slew after dome open, 75.5 alt slewing upwards. ------- 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 -------------------------------------------------------------------------- 19:04 arctic 459( 643) -34 75 -1.7 -0.2 0.2 -0.4 -1.5 SDSS_r 1.98 20:03 arctic 509( 650) -65 65 -1.7 -1.2 -1.1 -1.8 -1.8 SDSS_r 2.15 22:46 NICFPS 571( 1036) -94 31 -1.3 -1.2 -1.4 -1.8 -1.5 MK_Ks 0.81 00:33 kosmos 500( 538) 223 56 -1.4 -1.4 -1.6 -2.0 -1.9 -- 0.91 03:27 kosmos 500( 516) 261 70 -2.6 -1.7 -1.8 -2.5 -2.7 -- 1.51 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 35 21 29 269 (W) 3059 mstly cldy none 17:00 34 20 28 268 (W) 2320 mstly cldy none 18:00 32 18 28 270 (W) 1700 mstly cldy none 19:00 29 20 13 268 (W) mstly cldy none 20:00 29 22 17 269 (W) mstly cldy none 21:00 29 23 17 268 (W) mstly cldy none 22:00 30 24 18 254 (WSW) mstly clr none 23:00 30 22 20 250 (WSW) mstly cldy none 00:00 29 23 17 252 (WSW) mstly cldy none 01:00 29 24 18 262 (W) mstly cldy none 02:00 29 23 20 255 (WSW) mstly cldy none 03:00 27 23 25 251 (WSW) ptly cldy none 04:00 27 23 20 265 (W) mstly clr none 05:00 26 23 23 246 (WSW) mstly clr none 06:00 26 22 27 248 (WSW) 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