From: "N.C. Hastings" Subject: 3.5m Night Log 990528 Date: Sat, 29 May 1999 04:57:06 -0600 Apache Point Observatory, Sunspot, NM Friday, May 28th, 1999 3.5-meter Night Observing Log Actual ---------------------------------------------------------------------- ASTRONOMER OBSERVER(S) INSTRUMENT DATE START FINISH ---------------------------------------------------------------------- J.Johnson J.Johnson DIS 5/28-29 --:-- --:-- D.York D.York Echelle 5/29 --:-- --:-- E.Turner C.Hastings SPIcam 5/29 --:-- --:-- ---------------------------------------------------------------------- INST SCHEDULED WEATH EQUIP OBS DAY NOTUSED I/RS/DN START FINISH D B D B D B USE D B ---------------------------------------------------------------------- NM07/R 21:43 01:10 - 3.4 - 0 - 0.0 0 - 0 UC03/R 01:10 03:46 - 2.6 - 0 - 0.0 0 - 0 PU03/S 03:46 04:18 - 0.5 - 0 - 0.0 0 - 0 -------------- Activity Log -------------- Observing Specialist: N.C.Hastings Clouds kept us closed all night again. Thunderstorms early on and thick layer just sitting on us the rest of second half. At about 04:00 MST the pressurized air system failed site wide. After checking the compressors and such I moved the 3.5m to zenith. (It was previously at 60 degrees). After checking the 3.5m air system I went to the 2.5m enclosure and shut the air supply off at the input line. This fixed the problem and the system came back up to pressure. It appears that the 2.5m blew an air line somewhere in the telescope. I called Mark Klaene and French Leger to report this. Currently the 2.5m PMSS is running without air. The alarm is going off. The 3.5m and all other systems are running as normal. Also, the air dryer was flashing and error light due to a failed switch. I reset and the dryer cycled and dried as normal. I assume the error was due to the sudden loss of pressure. FOCUS LOG May 28th 1999 Best Telescope Temp Wind Seeing Time Instrmnt Focus Az El Air/Truss Dir MPH filter FWHM" --------------------------------------------------------------------- WEATHER LOG May 28th 1999 Wind Time Temp-F Dewp-F MPH Direction Dust Sky Precip ------------------------------------------------------------------ 16:01 67 28 12 238 (WSW) 946 Ptly Cldy None 17:01 61 32 11 260 (W) 864 Ptly Cldy None 18:01 50 36 21 10 (N) 1192 Cloudy Rain 19:01 48 37 17 43 (NE) 957 Cloudy Rain 20:01 48 35 20 54 (NE) 739 Cloudy None 21:01 53 32 6 83 (E) 977 Cloudy None 22:01 49 35 1 120 (ESE) 906 Cloudy None 23:01 52 31 10 353 (N) 706 Cloudy None 00:01 50 33 14 48 (NE) 702 Cloudy None 01:01 53 30 3 2 (N) 958 Cloudy Rain 02:01 50 33 1 73 (ENE) 779 Cloudy None 03:01 48 34 10 269 (W) 823 Cloudy None 04:01 49 34 5 266 (W) 872 Cloudy None note: the wind was coming from the azimuth listed. The convention used is north=0 degrees, east=90 degrees. The dust count is for the particles > 1 micron per 0.1 cu.ft. TELESCOPE STATUS Primary, secondary, and tertiary mirrors in place and collimated. Primary support system operational. Mirror ventilation system in place. Telescope drives operational. Current Remark version: 2.55b5 Current guide software version: GIm Ctrl v3.0b 17.out - NCH