Apache Point Observatory 3.5m Telescope Night Log Saturday, May 02, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- UW09 C.Chandler C.Chandler,D.Singh UW10 A.Heinze A.Heinze ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- UW09 ARCTIC --:-- --:-- UW10 ECHELLE 01:54 05:03 UW10 ECHELLE 05:31 06:02 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- UW09/R 19:55 01:10 1.1 4.1 0 0 0.0 0.0 0 0 UW10/R 01:10 06:05 0 1.2 0 0 0.0 3.7 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: A.Townsend Overcast and very humid at the start of the night; we stayed closed until an hour into B-half when the clouds had cleared up and the humidity was improved enough to open. We closed for about half an hour in the morning due to humidity but opened up for the very end of the night to get just a little more data when the humidity came back down again. ------- 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 -------------------------------------------------------------------------- 01:59 ecamera 667( -58) 56 42 3.4 3.4 5.6 3.1 2.6 ND3 1.31 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 40 32 3 249 (WSW) cloudy humid 17:00 41 32 6 263 (W) 612 cloudy humid 18:00 42 32 5 247 (WSW) cloudy humid 19:00 40 32 6 263 (W) cloudy humid 20:00 39 32 2 242 (WSW) cloudy humid 21:00 38 31 4 190 (S) ptly cldy humid 22:00 37 31 2 199 (SSW) mstly clr humid 23:00 37 32 7 181 (S) mstly clr humid 00:00 37 32 3 193 (SSW) mstly clr humid 01:00 38 32 1 187 (S) mstly clr humid 02:00 38 32 1 234 (SW) mstly clr humid 03:00 38 32 1 246 (WSW) mstly clr humid 04:00 37 31 2 210 (SSW) mstly clr humid 05:00 37 31 3 238 (WSW) mstly clr humid 06:00 38 32 6 261 (W) mstly clr 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