Apache Point Observatory 3.5m Telescope Night Log Saturday, March 14, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- AP02 S.Merkowitz R.McMillan,T.Sutherland UW02 P.Yoachim Z.Liu UW05 B.Benda B.Benda ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- AP02 APOLLO 20:15 21:32 UW02 KOSMOS --:-- --:-- UW05 ECHELLE 00:50 06:27 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- AP02/R 19:19 22:45 2.1 0 0 0 1.3 0.0 0 0 UW02/R 22:45 01:10 2.4 0 0 0 0 0.0 0 0 UW05/R 01:10 07:05 0 0 0 0 4.1 1.8 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: T.Sutherland Restarted gcam nubs at checkout. Dust was jumpy at start of night. Stayed closed out of abundance of caution. Once weather cleared a little, we were able to track satellites with echelle. Clouds and dust caused us to close at 21:30. Clouds and dust finally calmed down and we were able to open at 00:45. UW02 has alrady logged off at that point, so those extra few minutes went to UW05. Dataq power cycle at 01:45. No morning echelle iol, cals were being taken. No 3.5m telescope or instrument problems 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 -------------------------------------------------------------------------- 23:58 ecamera 421( -80) 201 59 8.1 8.5 9.9 8.3 7.8 clear 1.84 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 56 14 21 261 (W) 386 ptly cldy none 17:00 55 14 17 262 (W) 1436 ptly cldy none 18:00 57 15 33 232 (SW) 3621 ptly cldy dust 19:00 51 12 20 245 (WSW) 6025 ptly cldy dust 20:00 50 14 17 259 (W) 2304 ptly cldy none 21:00 50 13 11 252 (WSW) 2153 mstly cldy none 22:00 49 12 14 250 (WSW) 8504 mstly cldy dust 23:00 49 12 21 277 (W) 4883 mstly cldy dust 00:00 47 13 16 267 (W) 1701 mstly cldy none 01:00 47 13 14 275 (W) 2213 mstly clr none 02:00 46 13 11 288 (WNW) 3143 clear none 03:00 45 12 8 265 (W) 2482 mstly clr none 04:00 43 11 9 295 (WNW) 1272 mstly clr none 05:00 42 11 15 325 (NW) 647 clear none 06:00 42 12 22 323 (NW) 597 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