Apache Point Observatory 3.5m Telescope Night Log Thursday, January 29, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- WY01 M.Brotherton M.Brotherton AP02 S.Merkowitz R.McMillan NM06 W.Roberson E.Nielsen ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- WY01 KOSMOS --:-- --:-- AP02 APOLLO --:-- --:-- NM06 ECHELLE --:-- --:-- PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- WY01/R 17:42 20:22 0 2.7 0 0 0.0 0.0 0 0 AP02/R 20:22 00:10 0 3.8 0 0 0.0 0.0 0 0 NM06/R 00:10 06:51 1.5 5.2 0 0 0.0 0.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: J.Dembicky Closed again tonight due to remaining snow on the enclosure and we are still on generator power (as of 17:00). At 19:45 we had a short power fluctuation, I think we may have switched back to mains power at that time. About 3 minutes later power went out for about 5-10 seconds as we switched back to the generator. That was lots of fun loosing the hall lights as I was walking out to the kitchen at the time. About 1 minute or two later we had another short power flicker and we switched back to mains power!!! A power drop at 20:32 again, and we are back on generator power. Another fluctuation at 21:09, back on Main. Dome parked facing SE per Bill's request to help melt remaining snow on enclosure. We have been on mains power since about 21:09. The roofcam feed seems to be down in the control room. No Signal. I noticed this occured in the afternoon. Maybe a cable disconnected from the sliding snow on the ops building roof. PR sumbitted. Instrument fills done @ 05:10 this morning. ------- 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 -------------------------------------------------------------------------- ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 35 12 5 9 (N) 422 mstly cldy none 17:00 31 17 16 37 (NE) 487 mstly cldy none 18:00 33 5 11 27 (NNE) 326 mstly cldy none 19:00 32 -5 10 32 (NNE) 234 mstly cldy none 20:00 34 -4 11 45 (NE) 414 mstly cldy none 21:00 33 -1 20 19 (NNE) 421 mstly cldy none 22:00 32 0 8 12 (NNE) 337 mstly cldy none 23:00 32 -1 8 13 (NNE) 320 mstly cldy none 00:00 32 1 17 26 (NNE) 336 mstly cldy none 01:00 32 3 12 4 (N) 325 mstly cldy none 02:00 31 3 12 359 (N) 331 mstly clr none 03:00 30 3 14 17 (NNE) 345 clear none 04:00 30 1 9 11 (N) 252 clear none 05:00 29 -2 6 4 (N) 270 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