APACHE POINT OBSERVATORY SDSS 2.5M OBSERVING LOG Monday March 17, 2003 (MJD 52716) ---=== OBSERVING TEAM ===--- Night: Dan Long, Pete Newman Visitors: Connie Rockosi (UW), Robert Lupton (PU), Gaius Miknaitis (UW), Sean Raymond (UW) ---=== OBSERVING PLAN ===--- Time-domain imaging program during bright-time. ---=== OBSERVING SUMMARY ===--- Weather kept us closed. The enclosure ODH alarm went off (see Telescope and Problem sections). ---=== OBSERVING LOG ===--- Overcast, high winds and snow took turns at keeping us closed. At 10Z, we gave up as there was no chance the conditions would improve. ---=== IMAGING RUN SUMMARY ===--- Run Time Stripe Lambda Last Flavor Comments Start End Begin End Frame ------------------------------------------------------------------------- 3783 00:35Z 00:50Z 100 O -106.75 -103.18 49 bias Ignore 3786 03:12Z 03:13Z 100 O -67.40 -67.13 16 ignore Ignore ---=== IMAGING RUN DETAILS ===--- ---=== SKIPPY RESULTS ===--- Run Frame nFrames stars muErr muRms nuErr nuRms rot az el --------------------------------------------------------------------------- ---=== LTMATCH RESULTS ===--- Run Field nFields alt az nGood rowMean rowSig colMean colSig rot ------------------------------------------------------------------------ ---=== SPECTROSCOPY DATA SUMMARY ===--- Summary Checked (y/n): QA Procedures Done (y/n): UT Exp Time flavor comment (S/N)^2 totals ========================================== b1 r1 b2 r2 ---=== TELESCOPE OFFSETS AND SCALE I ===--- Time Instrument Az Alt Rot Scale pos offset pos offset pos offset ------------------------------------------------------------------------------ ---=== TELESCOPE OFFSETS AND SCALE II ===--- ---=== DATA TAPE SUMMARY ===--- endNight run on the Cloudy Night tapes, so nothing to ship, nothing stored. ---=== FOCUS LOG ===--- setmir piston Temp Wind Time Inst scale M1 M2 Foc Az Alt (C) MPH Dir filt fwhm ------------------------------------------------------------------------------ ---=== WEATHER LOG ===--- Wind Time Temp F Dewp F MPH Direction Dust DIMM Sky 00:47Z 25 21 34 269 (W) 740 - Overcast 01:20Z 25 22 26 257 (WSW) 740 - " 01:52Z 23 18 34 240 (WSW) 622 - " 02:28Z 23 20 22 270 (W) 610 - " 03:00Z 22 21 14 256 (WSW) 631 - " 03:32Z 22 20 19 236 (SW) 658 - " 04:05Z 22 21 20 241 (WSW) 1065 - " 04:37Z 22 22 17 215 (SW) 438 - " 05:09Z 22 21 12 238 (WSW) 179 - Light snow 05:45Z 22 20 9 265 (W) 5694 - " 06:17Z 22 20 11 271 (W) 4832 - " 06:49Z 23 21 18 253 (WSW) 421 - " 07:22Z 23 20 19 218 (SW) 615 - " 07:54Z 23 20 21 236 (SW) 331 - " 08:26Z 23 19 19 256 (WSW) 336 - " 08:58Z 22 18 24 270 (W) 345 - " 09:30Z 21 15 11 274 (W) 1011 - " ---=== TELESCOPE STATUS ===--- 08:05Z ODH alarm on. See problem section #1 for details. 09:05Z ODH alarm is off again. Status at 09:54Z: Telescope stowed at: 30 deg Instrument mounted: Imager Counterweights at: Upper limit Autofill systems: On 180L LN2 dewar weights: Spectro 239 lb Imager 152 lb ---=== SOFTWARE USED ===--- IOP/SOP: v3_111_1 Watcher: v2_21_0 MCP: v5_18_0 TPM: tpm_v2_28_0 AstroDa: v14_47 TCC: TCC 2.6.8 November 13 2002 sdssProcedures: v1_65 SoS: v4_9_13 hoggPT: v1_6_7 plate-mapper: v4_2_0 ---=== MIRROR NUMBERS ===--- PRIMARY: -------- Scale: 1.000000 MIGS TONIGHT NOMINAL Axial A 0.1110 0.0790 Axial B 0.7940 0.7970 Axial C 0.8180 0.8240 Trans D -9.0730 -9.1130 Lateral E 1.8650 1.8870 Lateral F 0.0000 1.4300 GALILS Commanded: 5400. -3700. 900. -200. 31550. 30650. Actual: 5400. -3700. 900. -200. 31550. 30650. SETMIR VALUES PriDesOrient: 0.00 -11.80 23.00 1256.90 642.10 PriOrient: 0.00 -12.16 22.81 1257.41 642.19 SECONDARY: ---------- Focus: 0.00 Air Temp.: -4.9 Alt.: 30.002964 MIGS TONIGHT NOMINAL Axial A 1.5160 1.5170 Axial B 1.1540 1.1560 Axial C 1.1010 1.0990 Trans D -0.6990 -0.7070 GALILS Commanded: 1619548. 1555013. 1576543. -3400. -7900. Actual: 1619650. 1555250. 1576350. -3400. -7900. SETMIR VALUES SecDesOrient: 1257.00 0.00 -20.00 0.00 130.98 SecOrient: 1256.97 -0.14 -20.02 -0.49 130.98 ---=== PROBLEMS IN DETAIL ===--- Problem #1 - ODH alarm ---------------------- Around 08:05Z, we noticed the ODH strobe was flashing the the low-light cameras. At the time, both instruments were filling simultaneously. After ~45 minutes the fills ended normally and the dewar weights were stable as reported by the TPM. We were thus confident that there was NOT a great excess of N2 in the enclosure, so Dan and I investigated. After taking appropriate precautions, we determined the upper enclosure sensors were reading 20.2% (north wall) and 19.2% (south fork) and the lower enclosure sensor was reading 18.2%. We tried to use a portable sensor as a check, but the one we could find failed its self test. We also could not find the ODH procedures, and email Mark Klaene for advice (we suggest that these be linked from the Emergency section of http://sdsshost/). About 09:05Z, the alarm ceased. We note that at the time the alarm sounded: - The enclosure had been closed up and unventillated all night, and was probably better sealed than usual due to light icing. - The alarm sounds just 1% below normal O2 PP, which seems rather soon. - Both instruments were filling. - The lowest O2 reading was in the cone. - The atmospheric pressure was ~20.9 in Hg.