Apache Point Observatory 3.5m Telescope Night Log Wednesday, October 28, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- UW01 P.Yoachim Z.Liu,Z.Xu WY02 M.Brotherton M.Brotherton,M.Gordon,K.Zhang AP01 S.Merkowitz R.McMillan NM05 E.Serviss E.Serviss,A.Smith ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- UW01 KOSMOS 20:01 21:40 WY02 KOSMOS --:-- --:-- AP01 APOLLO --:-- --:-- NM05 ECHELLE --:-- --:-- PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- UW01/R 18:24 21:50 1.6 0.2 0 0 0.1 1.5 0 0 WY02/R 21:50 23:55 0 2.1 0 0 0.0 0.0 0 0 AP01/W 23:55 01:10 0 1.2 0 0 0.0 0.0 0 0 NM05/R 01:10 07:10 0 6.0 0 0 0.0 0.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: A.Townsend Opened up around 20:00 once the humidity stabilized below the limit. We were able to stay open for a little while before closing back up due to humidity, nearby radar, and subsequent fog and clouds. We did not reopen. ARCTIC LL quad saturated at checkout; mostly recovered by 21:00. We had a couple false positive alarms on the rain sensor 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 -------------------------------------------------------------------------- 20:18 kosmos 425( 1084) 36 46 9.9 11.6 11.4 11.2 10.1 -- 1.14 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 56 43 10 192 (SSW) 338 ptly cldy none 17:00 54 46 11 199 (SSW) 421 ptly cldy none 18:00 51 45 7 191 (S) mstly clr humid 19:00 48 42 7 179 (S) mstly clr humid 20:00 48 40 10 184 (S) mstly clr humid 21:00 49 44 17 158 (SSE) clear humid 22:00 49 43 14 185 (S) clear fog 23:00 47 46 15 150 (SSE) ptly cldy fog 00:00 46 44 17 150 (SSE) ptly cldy fog 01:00 46 44 17 161 (SSE) ptly cldy humid 02:00 48 43 17 183 (S) ptly cldy humid 03:00 47 44 15 182 (S) cloudy humid 04:00 47 45 10 182 (S) cloudy humid 05:00 46 45 11 182 (S) cloudy fog 06:00 46 46 9 187 (S) cloudy fog 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: 3.2.2