Apache Point Observatory 3.5m Telescope Night Log Friday, April 03, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- EN01 B.Ketzeback J.Dembicky ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- EN01 KOSMOS 20:30 23:00 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- EN01/W 19:33 06:39 0 0 0 0 1.7 9.4 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: J.Dembicky Restarted the DATAQ with new filename KOSMOS gfocus check Center slit gfocus 1100 - FWHM 5.6 gfocus 1150 - FWHM 5.8 gfocus 1200 - FWHM 5.2 gfocus 1250 - FWHM 4.4 gfocus 1300 - FWHM 4.2 gfocus 1350 - FWHM 4.0 gfocus 1400 - FWHM 4.3 gfocus 1450 - FWHM 5.0 gfocus 1500 - FWHM 5.9 Best gfocus 1350 Low slit gfocus 1350 - FWHM 4.6 gfocus 1400 - FWHM 4.4 gfocus 1450 - FWHM 3.9 gfocus 1500 - FWHM 3.9 gfocus 1550 - FWHM 3.5 gfocus 1600 - FWHM 3.8 gfocus 1650 - FWHM 3.8 gfocus 1700 - FWHM 4.1 gfocus 1750 - FWHM 5.0 Best gfocus 1550 High slit gfocus 1100 - FWHM 3.8 gfocus 900 - FWHM 4.5 gfocus 950 - FWHM 4.4 gfocus 1000 - FWHM 4.0 gfocus 1050 - FWHM 3.8 gfocus 1100 - FWHM 3.5 gfocus 1150 - FWHM 3.8 gfocus 1200 - FWHM 3.8 gfocus 1250 - FWHM 3.9 gfocus 1300 - FWHM 4.2 Best gfocus 1100 Russet felt the ecam focus was pretty good last night. I also think I adjusted it a few months ago as well. The wind shifted to the East after midnight and seeing degraded. 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 -------------------------------------------------------------------------- 21:06 kosmos 435( 1062) 123 66 9.6 11.1 11.0 10.5 9.2 -- 1.20 21:57 klow 435( 996) 1 54 8.8 9.7 10.2 9.3 8.9 -- 1.10 22:24 khigh 500( 1025) -10 54 8.7 8.9 9.6 8.6 8.4 -- 1.10 23:02 khigh 500( 1002) -25 51 8.6 8.4 9.1 8.3 8.0 -- 1.00 23:28 kosmos 425( 931) -92 34 8.9 8.2 8.8 7.8 8.1 -- 1.50 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 54 20 13 270 (W) 826 mstly clr none 17:00 57 21 11 244 (WSW) 957 clear none 18:00 56 24 10 250 (WSW) 1100 clear none 19:00 55 22 9 263 (W) 1049 clear none 20:00 50 20 11 241 (WSW) 1082 clear none 21:00 50 14 14 221 (SW) 794 clear none 22:00 48 12 11 238 (WSW) 778 mstly clr none 23:00 47 13 9 115 (ESE) 846 mstly clr none 00:00 49 15 2 24 (NNE) 1034 mstly clr none 01:00 50 14 1 216 (SW) 965 mstly clr none 02:00 49 13 5 203 (SSW) 776 mstly clr none 03:00 41 15 9 87 (E) 951 ptly cldy 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