Subject: 3.5m Night Log 20250819 From: mcmillan@apo.nmsu.edu Date: Wed, 20 Aug 2025 11:51:05 +0000 (UTC) Apache Point Observatory 3.5m Telescope Night Log Tuesday, August 19, 2025 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- SU01 J.Hughes J.Hughes UW10 S.Hawley S.Hawley,L.Hebb UW03 P.Yoachim Z.Liu,Z.Xu ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- SU01 KOSMOS --:-- --:-- UW10 ECHELLE 03:25 04:02 UW03 KOSMOS 04:05 05:03 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- SU01/R 19:52 01:10 5.3 0 0 0 0.0 0.0 0 0 UW10/R 01:10 04:00 2.1 0 0 0 0.2 0.5 0 0 UW03/R 04:00 06:22 0 1.4 0 0 0.0 1.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: R.McMillan Nearby radar, clouds, and humidity kept us closed for the first half of the night. Just when I was thinking the second half would be the same, humidity dropped and the last storm moved away, so I opened. Once science integration started, the humidity started to creep back up, but two programs were able to get at least a little bit of data. The optical all-sky camera had a failure at the beginning of the night. I was able to restart it, but images appeared blank. That turned out to be because the camera wasn't cooling, so Cary came in to get it going again. After that it worked through the night. KOSMOS had two failures of the disperser wheel, both at near 0 rotation. One occurred while moving to the red disperser, and one while moving to the red disperser. Neither failure cost time on sky. ------- 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 -------------------------------------------------------------------------- 03:31 ecamera 477( 283) -47 41 14.0 14.7 15.7 14.4 13.7 ND2 1.40 04:12 kosmos 427( 1174) 155 66 13.3 13.8 14.7 13.6 13.2 - 1.20 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 65 56 6 298 (WNW) 413 mstly cldy none 17:00 64 49 1 214 (SW) 465 mstly cldy lt rain 18:00 62 54 1 224 (SW) mstly cldy lt rain 19:00 63 52 3 214 (SW) mstly cldy none 20:00 59 53 9 83 (E) cloudy none 21:00 58 54 11 85 (E) cloudy humid 22:00 58 54 16 83 (E) mstly cldy humid 23:00 57 54 13 88 (E) mstly cldy humid 00:00 57 53 12 84 (E) ptly cldy humid 01:00 57 53 4 102 (ESE) mstly clr none 02:00 57 53 10 90 (E) mstly clr none 03:00 57 52 13 83 (E) mstly clr none 04:00 56 52 9 88 (E) mstly clr humid 05:00 56 52 10 77 (ENE) mstly clr humid 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