Apache Point Observatory 3.5m Telescope Night Log Monday, March 09, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- OU04 M.Kilic G.Jewett NM01 S.Monty S.Monty ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- OU04 ARCTIC 19:15 22:30 NM01 ECHELLE 02:45 03:55 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- OU04/R 19:15 01:10 2.7 0 0 0 3.2 0.0 0 0 NM01/R 01:10 07:11 0.2 4.6 0 0 0.0 1.2 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: J.Dembicky We closed at 22:45 due to approaching radar. The weather display was not updating screens properly and I had to refresh both the local Holloman and the State Level 2 screens. Suddenly there was green all around us. The IR satellite image was updating properly. Harry had to re-log in earlier tonight to the WeatherTap and that may be why the other two did not update. Dataq was frozen tonight I restarted it around 02:00 and then again around 03:50. We opened around 02:00 and clouds almost immediately formed over us. Stephanie took one exposure (of basically cloud, no spectra) and I decided to close the mirror covers just to be safe. It didn't look like rain but we had rain sprinkles earlier in the evening. We re-opened at 02:45 and observed until 03:55 when the next wave of clouds covered us, this time with radar returns approaching from the south. No telescope issues tonight. ------- 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 -------------------------------------------------------------------------- 19:43 arctic 475( 1143) 198 68 8.1 9.9 9.7 9.2 8.1 BG40 1.18 19:45 NA2gdr 36880(36880) 199 68 8.2 9.9 9.6 9.1 8.1 clear 1.27 01:59 ecamera 461( -95) 29 73 7.7 7.4 8.3 7.6 7.4 ND2 0.88 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 58 23 13 212 (SSW) 1844 mstly clr none 17:00 55 19 15 214 (SW) 1582 clear none 18:00 53 19 17 215 (SW) 1373 clear none 19:00 48 16 13 225 (SW) 1279 clear none 20:00 47 15 10 214 (SW) 1281 clear none 21:00 46 15 8 194 (SSW) 1123 clear none 22:00 47 15 13 182 (S) 1181 ptly cldy none 23:00 48 18 18 185 (S) 1364 cloudy lt rain 00:00 45 21 13 144 (SE) 1264 cloudy lt rain 01:00 45 24 14 177 (S) 1308 cloudy none 02:00 46 27 17 189 (S) 2465 ptly cldy none 03:00 44 27 19 201 (SSW) 2752 ptly cldy none 04:00 43 28 14 177 (S) 3156 mstly cldy none 05:00 42 28 11 181 (S) 2902 cloudy lt snow 06:00 41 27 11 198 (SSW) 1373 cloudy lt rain 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