Apache Point Observatory 3.5m Telescope Night Log Sunday, September 27, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- GS02 D.Gies A.Chaturvedi OU04 N.Vernekar N.Vernekar OU01 J.Serna J.Serna ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- GS02 ECHELLE 19:01 01:10 OU04 ECHELLE 01:10 01:40 OU04 ECHELLE 03:07 05:47 OU01 NICFPS 05:50 06:42 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- GS02/R 19:01 01:10 0 0 0 0 0.2 5.9 0 0 OU04/R 01:10 05:47 0 1.5 0 0 0.0 3.1 0 0 OU01/R 05:47 06:47 0 0 0 0 0.0 1.0 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: J.Dembicky Clouds started coming in around midnight, by 01:40 my observer wasn't able to see anyhting, but clouds, on the slitviewer. The clouds thinned out around 03:05 and we were taking data again, for the rest of the night. 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 -------------------------------------------------------------------------- 19:22 ecamera 255( 136) 41 74 13.1 16.6 16.2 16.3 14.3 ND4 1.04 20:10 ecamera 316( 110) 0 61 12.6 14.8 14.8 14.4 13.0 ND3 1.14 01:11 ecamera 354( -5) 150 68 12.0 11.6 12.2 11.4 11.8 ND3 0.98 06:02 NICFPS 354( 1469) 7 57 12.7 12.0 12.6 12.0 12.3 BrGr-2.17 0.80 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 63 32 7 325 (NW) 122 clear none 17:00 62 35 4 289 (WNW) 130 clear none 18:00 61 34 8 305 (NW) 167 clear none 19:00 59 33 2 351 (N) 119 clear none 20:00 55 41 11 83 (E) 230 clear none 21:00 55 43 11 89 (E) 220 clear none 22:00 55 42 8 87 (E) 201 clear none 23:00 55 40 9 108 (ESE) 198 clear none 00:00 53 42 11 86 (E) 205 mstly clr none 01:00 54 41 14 111 (ESE) 214 ptly cldy none 02:00 54 40 14 111 (ESE) 177 mstly cldy none 03:00 54 39 12 120 (ESE) 175 ptly cldy none 04:00 55 38 16 132 (SE) 212 mstly clr none 05:00 55 37 9 142 (SE) 191 mstly clr none 06:00 55 38 15 137 (SE) 174 mstly clr 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: