Subject: 3.5m Night Log 20251017 From: tmcquaid@apo.nmsu.edu Date: Sat, 18 Oct 2025 13:02:23 +0000 (UTC) Apache Point Observatory 3.5m Telescope Night Log Friday, October 17, 2025 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- UV02 A.Verbiscer A.Verbiscer NM01 M.Prescott M.Prescott,10students AP01 S.Merkowitz R.McMillan ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- UV02 ARCTIC 18:36 01:08 NM01 ECHELLE 03:32 05:55 AP01 APOLLO 05:58 06:59 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- UV02/R 18:36 01:10 3.5 0 0 0 3.1 0.0 0 0 NM01/R 01:10 06:01 2.4 0 0 0 0.9 1.5 0 0 AP01/R 06:01 07:01 0 0 0 0 0.0 1.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: T.McQuaid Dome opened at 18:36 for skyflats, closed at 19:09 for dome flats, and reopened for science targets at 19:30. Due to cloud cover, stopped telescope and closed mirror covers at 21:09. Reopened mirror covers at 21:20 but cloud cover was still substantial, so no useful data could be obtained. Due to cloud cover, closed the dome at 21:55 Precipitation alarm sounded at 22:50 Reopened dome once weather had cleared at 00:39 and resumed on sky until 1:08. Changed from ARCTIC to eyepiece observing for class's B-half but closed again due to clouds at 01:32, then remounted ARCTIC. Reopened at 03:32 and switched to echelle for remainder of B half. Switched to APOLLO at 05:58. ------- 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 -------------------------------------------------------------------------- 19:31 arctic 490( 1117) 46 35 7.8 8.7 8.9 8.1 7.8 SDSS_r 1.19 03:39 ecamera 523( -97) 313 55 4.9 5.9 6.9 5.9 5.2 -- 1.52 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 52 37 18 235 (SW) 858 clear none 17:00 50 36 14 267 (W) 773 clear none 18:00 49 35 16 261 (W) 845 clear none 19:00 46 36 15 246 (WSW) 930 clear none 20:00 45 34 14 240 (WSW) 828 ptly cldy none 21:00 46 33 14 262 (W) 836 cloudy none 22:00 46 32 17 252 (WSW) 906 cloudy lt rain 23:00 46 33 21 238 (WSW) 893 cloudy none 00:00 45 32 22 268 (W) 838 ptly cldy none 01:00 44 32 21 280 (W) 830 cloudy none 02:00 43 31 18 319 (NW) 748 cloudy none 03:00 41 29 17 332 (NNW) 906 mstly cldy none 04:00 41 28 23 280 (W) 845 clear none 05:00 39 26 10 316 (NW) 529 clear none 06:00 37 28 12 334 (NNW) 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