Apache Point Observatory 3.5m Telescope Night Log Sunday, August 02, 2026 PROG PI ASTRONOMER OBSERVER(S) -------------------------------------------------------------------- EN02 C.Smith J.Dembicky, R.McMillan ON-SKY PROG INSTRUMENT START FINISH -------------------------------------------------------------------- EN02 APOLLO 20:08 23:00 EN02 Echelle 23:00 01:00 EN02 ARCTIC 01:00 02:00 PROG SCHEDULED WEATH EQUIP OBS NOT USED I/ROW/DTN START FINISH D B D B D B D B ----------------------------------------------------------------- EN02/W 20:09 06:10 0 4.2 0 0 2.1 3.8 0 0 note: scheduled times listed include instrument change time ------------- ACTIVITY LOG -------------- Observing Specialist: J.Dembicky We got the Echelle cal mirror and lamps back this afternoon. Thanks to Cary coming over and working on the issue as well as for Tracey resetting the terminal server this afternoon. Cary thinks he may have a better idea where the underlying fault may be in the system. I opened around 19:00 as the enclosure was warm inside. I waited until the end of twilight before starting engineering to get the dome temps equalized. Russet checked sag coefficients with APOLLO. Russet reported that there was no sag for APOLLO. I switched over to the echelle and did them with that port. I corrected the instrument file for just the average Xtilt, the Ytilt was too small. I re-checked pointing with a few stars and it seemed to put the star now closer to the slit. Russet then checked pointing with APOLLO and reported that it looked really good. Since it was clear I next attempted throughput measurements. Note: the star finder charts are not found in the wiki pages due to the new APO web page links. They are still available on the legacy pages but should be moved. It was perfectly clear and photometric, although seeing was marginal. Half way into my first throughput star and suddenly fast moving clouds started appearing overhead. By the time I finished my first star there were enough clouds to basically make throughput impossible to finish. Conditions stayed this way until I finally gave up at 04:30. At this point, as even if the clouds cleared, there was not enough time for throughput. ------- 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 -------------------------------------------------------------------------- 01:26 arctic 501( 1357) 46 41 15.6 15.8 16.4 15.6 15.6 sdss_g 1.78 ------------- WEATHER LOG ---------------- Wind Precip.or Time Temp F Dewp F MPH Direction Dust Sky Conditions ------------------------------------------------------------------ 16:00 69 48 8 260 (W) 1158 mstly cldy none 17:00 71 50 3 194 (SSW) 1118 ptly cldy none 18:00 69 48 9 275 (W) 1115 mstly clr none 19:00 69 47 4 233 (SW) 1090 mstly clr none 20:00 65 48 6 217 (SW) 1083 clear none 21:00 65 47 4 206 (SSW) 1165 clear none 22:00 64 47 7 190 (S) 1168 clear none 23:00 64 45 11 186 (S) 1175 clear none 00:00 64 41 14 182 (S) 1334 clear none 01:00 61 39 15 146 (SE) 1461 clear none 02:00 61 39 10 173 (S) 1454 ptly cldy none 03:00 60 38 10 180 (S) 1384 ptly cldy none 04:00 62 38 13 187 (S) 1328 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: