APACHE POINT OBSERVATORY SDSS 2.5M OBSERVING LOG Saturday November 22, 2003 (MJD 52966) ---=== OBSERVING TEAM ===--- Night: Howard Brewington, Pete Newman Support: Jon Brinkmann (by phone) ---=== OBSERVING PLAN ===--- Science. ---=== OBSERVING SUMMARY ===--- High winds, dust and clouds in various combinations kept us closed until an hour before morning twilight, but we were unable to get science photons before dawn. ---=== OBSERVING LOG ===--- Afternoon check-out went smoothly. The spectrographs' foci were adjusted. The weather forecast of high winds and dust proved accurate, so we were unable to open despite cloud-free sky above. During the worst of the evening wind, we experienced high (>19000) 1.0u dust counts inside the 2.5m enclosure, despite the HVAC running a 0.5" water column over-pressure (I assume the units are inches of water). However, the counts inside dropped soon after the winds abated. Jon Brinkmann was phoned to discuss plans to clean the optics. Later, a very cold air mass moved in from the north, adding fast low orographic clouds into the mix, and the winds again increased. Air temperature dropped by about 12K from twilight to twilight. The 3.5m crew opened about 10:10Z to take advantage of the few photons making it through holes in the clouds, but it looked then as if there was no advantage to attempting science with the 2.5m, and given the dynamic weather, we did not want to risk ventilating onto dusty optics. However, at 11:20Z, an hour before 18 deg twilight, the sky cleared suddenly and completely, so we opened (in 18 minutes!), with a telescope seriously out of thermal equilibrium (Ttel ~0C, Tair ~-7C). Although we easily acquired the field (for plate 1299, cartridge 5), the intrinsic seeing was varying between 2.5 and 4 arcsec (as reported by the 3.5m crew), and combined with a telescope rapidly deforming with the temperature change, we were unable to achieve a useful focus before dawn. So we closed for the night. ---=== IMAGING RUN SUMMARY ===--- Run Time Stripe Lambda Last Flavor Comments Start End Begin End Frame ------------------------------------------------------------------------- 4275 22:53Z 23:15Z 100 O 113.97 119.65 51 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): Y QA Procedures Done (y/n): N UT Exp Time flavor comment (S/N)^2 totals ========================================== b1 r1 b2 r2 ----- sequence 23438, plate 1137 ------- Ignore 23:31 23438 10.0 flat 23:33 23439 2.0 arc 23:37 23440 2.1 arc 23:39 23441 2.1 arc 23:52 23442 2.1 arc 23:55 23443 2.1 arc ----- sequence 23444, plate 1299 ------- Ignore 12:11 23444 10.0 flat 12:14 23445 2.0 arc ---=== 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 ===--- None - endNight run onto the cloudy-night tapes. Goes: JL Stays: JL ---=== FOCUS LOG ===--- setmir piston Temp Wind Time Inst scale M1 M2 Foc Az Alt (C) MPH Dir filt fwhm ------------------------------------------------------------------------------ ---=== WEATHER LOG ===--- Non-zero dust measurements are for 1.0u particles from hand-held Met One laser particle counter on the 2.5m pad. This is an identical unit to that which has failed on the site meteorological tower. Wind Time Temp F Dewp F MPH Direction Dust DIMM Sky 22:51Z 42 11 27 246 (WSW) 23129 - No clouds 23:22Z 41 10 32 241 (WSW) 0 - " 23:52Z 40 10 35 256 (WSW) 0 - " 00:22Z 39 12 27 251 (WSW) 37247 - " 00:55Z 37 12 27 268 (W) 0 - " 01:27Z 35 18 24 275 (W) 0 - " 01:59Z 33 18 20 267 (W) 0 - " 02:31Z 32 15 21 267 (W) 3933 - " 03:04Z 32 16 20 281 (W) 0 - " 03:36Z 30 16 10 283 (WNW) 5249 - Fast low clouds 04:08Z 30 14 19 313 (NW) 0 - " 04:40Z 30 12 18 259 (W) 19000+ - " 05:13Z 30 12 32 290 (WNW) 7120 - " 05:45Z 29 10 21 278 (W) 0 - " 06:17Z 28 10 17 269 (W) 0 - " 06:49Z 27 7 17 278 (W) 0 - " 07:21Z 26 5 16 277 (W) 0 - " 07:54Z 26 5 20 272 (W) 683 - " 08:24Z 25 5 23 274 (W) 0 - " 08:54Z 25 7 18 260 (W) 0 - " 09:24Z 23 6 22 274 (W) 0 - " 09:54Z 22 5 15 296 (WNW) 0 - " 10:25Z 21 5 17 318 (NW) 0 - " 10:57Z 19 4 20 308 (NW) 0 - " 11:31Z 19 2 11 320 (NW) 0 - Clear 12:04Z 19 0 4 12 (NNE) 0 - " 12:37Z 18 0 15 334 (NNW) 0 - " ---=== TELESCOPE STATUS ===--- 11:20Z Fans on, enclosure off 12:35Z Enclosure on, fans off No interlocks bypassed. Status at 12:50Z: Telescope stowed at: 30 deg Instrument mounted: Cartridge 5 Counterweights at: 270 Autofill systems: On 180L LN2 dewar scales: Spectro 201 lb, 21 psi Imager 284 lb, 23 psi HVAC Space pressure set-point: 0.5 (dust exclusion procedure in force) ---=== SOFTWARE USED ===--- IOP/SOP: v3_121_0 Watcher: v2_24_0 MCP: v5_23_0 TPM: tpm_v2_36_0 AstroDa: v14_47 TCC: TCC 2.7.1 July 22 2003 sdssProcedures: v1_79 SoS: v4_10_6 hoggPT: v1_6_9 plate-mapper: v4_3_1 ---=== MIRROR NUMBERS ===--- PRIMARY: -------- Scale: 1.000000 MIGS TONIGHT NOMINAL Axial A 0.5500 0.5450 Axial B 0.6370 0.6370 Axial C 1.0870 1.0850 Trans D -8.4560 -8.4550 Lateral E 10.7696 10.7442 Lateral F 10.7950 10.7823 GALILS Commanded: 4600. -2850. 850. -9250. 18400. 17850. Actual: 4600. -2850. 850. -9250. 18400. 17850. SETMIR VALUES PriDesOrient: 0.00 0.00 15.20 829.90 1.60 PriOrient: 0.00 0.00 14.91 830.49 3.19 SECONDARY: ---------- Focus: 0.00 Air Temp.: 5.2 Alt.: 29.999604 MIGS TONIGHT NOMINAL Axial A 1.5150 1.5150 Axial B 1.1090 1.1100 Axial C 1.1170 1.1150 Trans D -0.8210 -0.8260 GALILS Commanded: 1628776. 1547706. 1574314. -3900. -8750. Actual: 1628650. 1548200. 1574500. -3900. -8750. SETMIR VALUES SecDesOrient: 1257.00 0.00 -25.00 0.00 146.27 SecOrient: 1256.86 -0.03 -25.19 0.14 146.58 ---=== PROBLEMS IN DETAIL ===---