Subject: 3.5m Night Log 20250929 From: dembicky@apo.nmsu.edu Date: Tue, 30 Sep 2025 11:10:09 +0000 (UTC) Apache Point Observatory 3.5m Telescope Night Log Monday, September 29, 2025 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- WY02 C.Kobulnicky N.Patten GS01 S.Lepine Z.Way ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- WY02 ECHELLE 19:40 23:00 GS01 ECHELLE --:-- --:-- PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- WY02/R 18:58 01:10 1.2 1.7 0 0 0.0 3.3 0 0 GS01/R 01:10 06:49 5.6 0 0 0 0.0 0.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: J.Dembicky Motion error Alt 73.5 deg slewing down, third checkout slew. We opened a little after sunset due to threatening clouds. Humidity caused us to close at 23:00 due to humidity. The 3 humidity sensors were all reading various number and changing inconsistently. I used the hand held unit in the SDSS control room, which was reading about 88% RH when I choose to close. The hand railing outside and car windshields were also covered in dew (the windshields more than the railing). We called it for the night at a little after 05:00, with high humidity still outside. ------- 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 -------------------------------------------------------------------------- 19:55 ecamera 557( 251) 209 55 9.4 12.6 12.3 12.2 9.6 clear 1.14 20:27 ecamera 458( 99) 177 78 9.1 11.6 11.3 11.8 9.6 clear 1.18 22:08 ecamera 404( -62) 233 67 8.6 9.3 9.7 8.9 8.4 clear 0.83 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 53 32 6 234 (SW) 303 mstly cldy none 17:00 53 32 11 209 (SSW) 306 mstly cldy none 18:00 55 31 12 209 (SSW) 289 ptly cldy none 19:00 50 32 15 145 (SE) 322 ptly cldy none 20:00 49 31 19 131 (SE) 347 mstly clr none 21:00 48 32 17 125 (SE) 322 clear none 22:00 47 31 12 116 (ESE) 370 mstly clr humid 23:00 47 31 15 129 (SE) 588 ptly cldy humid 00:00 47 32 15 145 (SE) 1026 mstly clr humid 01:00 47 32 14 160 (SSE) 1307 clear humid 02:00 47 32 13 168 (SSE) 1260 clear humid 03:00 49 32 12 203 (SSW) 651 clear humid 04:00 47 31 14 195 (SSW) 647 clear humid 05:00 47 31 13 202 (SSW) 733 clear 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