Subject: 3.5m Night Log 20250618 From: mcroom@apo.nmsu.edu Date: Thu, 19 Jun 2025 12:10:47 +0000 (UTC) Apache Point Observatory 3.5m Telescope Night Log Wednesday, June 18, 2025 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- NM08 K.Sanderson K.Sanderson,A.Dejeau GS02 D.Gies P.Wysocki ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- NM08 KOSMOS 21:23 23:17 GS02 ECHELLE 04:06 05:42 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- NM08/R 20:23 01:10 2.9 0 0 0 1.9 0.0 0 0 GS02/R 01:10 05:47 0.1 2.8 0 0 0.0 1.7 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: M.Croom Cary assisted by re-starting the all-sky at the start of the night. An alert was emailed indicating the all-sky had failed again but eventually restarted. DIS red pressure warning was issued yet the panel indicator was alive and at suitable levels. Dust delayed our getting on sky by an hour. We stayed open for almost 2 hours before the dust returned, this time along with humidity. Handheld counts were made periodically and dust remained above limits until 04:00 when the humidity and dust fell to acceptable levels. When switching from KOSMOS to Echelle, I forgot to open the mirror covers and got a motion error in alt going up from around 45 deg to 80 deg to do the tertiary rotation. An init and re-slew restored the alt drive. The telescope pointing worked well with echelle observations at the end of the night. ------- 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 -------------------------------------------------------------------------- 21:23 kosmos 275( 1521) -57 65 17.0 20.2 22.3 20.0 18.2 - 2.04 04:12 ecamera 382( 445) 37 53 17.6 16.1 17.6 15.8 16.8 ND4 0.88 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 77 38 12 256 (WSW) 4141 ptly cldy dust 17:00 78 30 10 269 (W) 3367 ptly cldy none 18:00 73 39 1 227 (SW) 3854 ptly cldy dust 19:00 69 45 8 99 (E) 4295 mstly clr dust 20:00 65 44 18 85 (E) 4121 clear dust 21:00 63 46 17 72 (ENE) 3856 clear none 22:00 62 46 19 77 (ENE) 3862 clear none 23:00 62 44 15 85 (E) 3860 clear none 00:00 60 52 20 77 (ENE) clear dust 01:00 58 52 19 76 (ENE) clear dust 02:00 60 50 17 77 (ENE) 4885 clear dust 03:00 58 52 14 78 (ENE) clear dust 04:00 63 35 8 87 (E) 3163 clear none 05:00 62 33 10 97 (E) 2483 clear none 06:00 63 28 11 115 (ESE) 1776 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