Date: Sun, 20 Aug 2000 06:23:32 -0600 From: "s. a. snedden" Subject: 2.5-m obslog 20000819 (MJD 51776) Saturday, August 19, 2000 Apache Point Observatory SDSS 2.5m Observing Log (MJD 51776) OBSERVING TEAM: =============== Dan Long (APO) Stephanie Snedden (APO) Lucianne Walkowicz - PT (JHU) Gary Long - PT (JHU) VISITORS: ========= Pete Newman (UCLan) THE PLAN: ========= The third night of shakedown. On-sky collimation and a pointing model, if time permits. SYNOPSIS FOR NIGHT: =================== Collimation of the primary was succesful, but ought to be fine-tuned later with the imager. A 96-star pointing model was obtained and later a 70 point one. A succesful night. TELESCOPE STATUS: ================= Stowed at 30 deg alt with the engineering camera on. Counterweights at 130. INTERLOCKS: =========== None bypassed SOFTWARE USED: ============== IOP/SOP: v3_17_5 Watcher: v2_8_3 MCP: v4_3_2 TPM: v2_0_0 AstroDa: 14_33 TCC: 2.4.0b2 WEATHER SYNOPSIS (see below for hourly data): ============================================= Partly cloudy to clear through the night. GENERAL COMMENTS (see Problems below for details): ================================================== French & co. came in today to correct the transverse actuator problem of last night. We were indeed not moving the piston last night. If you are curious to see what kind of images we were getting last night, look at /home/snedden/coma.fits. Unfortunately, exactly what was wrong, we don't know. Many parts were removed, tested and swapped during the afternoon, and finally it was put back together with all the original parts...and worked. Axial B went into oscillation during the afternoon, but disconnecting the pressure valve from the control board & reconnecting it stopped the oscillations. During the night, while collimating, axial A went into oscillation. Moving axial A to its reverse limit and back again stopped the oscillation. Collimation: ------------ We opened at sunset, mounted the engineering camera, found a bright star (Altair), and centered it and proceeded to collimate the primary. We followed the procedure Dan wrote incorporating Jim Gunn's & Russell Owen's collimation documents, and had no problems. The new collimated M1 values are in the mirrors section below. Pointing Model: --------------- We then proceeded to a pointing model. At first, changes in altitude of more than 10 degrees would put a star off the CCD, and we weren't sure if we had errors induced by the active setting of fiducials, or our old pointing model was just way off. After going to a few stars, it was clear that it was the latter. A short pointing model was then done (13 stars), with elevation sweeps at three different azimuths. Using this model allowed us to then slew from star to star and have them all be on the CCD, so that we could do a larger pointing model. The "real" pointing model used 96 points, ranging from 30 deg - 87 deg altitude. The results of the pointing model indicate that the active fiducial corrections, although good, may need some further tuning. There is a discontinuity in the values as the azimuth came back around to the starting azimuth value, so it appears there was some drift over the course of the model. In spite of this, the model is still good. Here are the results: --------------------- Large 96 point data set fit with one outlier removed. Note: when this data was applied the the fixed params of the 13 point model, sk rms was around 10 arcseconds. * inmod tdat:telmod DKA300:[TCC T 13 2.8675 IE -21.4291 IA -209.7660 AN -1.7474 AW -53.9014 HWCA2 -2.3177 HWSA2 -1.7023 HNCA1 -1.5744 HNSA1 -2.6391 CA +5.3043 PZZ1 -16.1765 ACEC -5.7401 ACES -5.4382 TX +5.2201 END * getdat pterr_20000820.dat;2 Read 95 data points * fit coeff change value sigma 1 IE -9.619 -31.05 1.331 2 IA +0.937 -208.83 1.531 3 AN -0.302 -2.05 0.482 4 AW +1.231 -52.67 0.482 5 HWCA2 -0.386 -2.70 0.619 6 HWSA2 +1.959 +0.26 0.639 7 HNCA1 +5.343 +3.77 0.723 8 HNSA1 +2.910 +0.27 0.729 9 CA +1.668 +6.97 1.105 10 PZZ1 +13.947 -2.23 4.689 11 ACEC +2.973 -2.77 0.928 12 ACES -1.367 -6.80 0.918 13 TX -7.796 -2.58 2.374 Sky RMS = 3.10 Popn SD = 3.34 ---------------- While taking the model, it was clear that the focus correction in altitude was not correct. Dan checked best focus at several altitudes and calculated a new secondary piston coefficient. Default.dat was updated with the new value (-286). There was a fairly constant 14 arcsec offset in altitude while getting the focus data, using the new pointing model. This was worrisome, so another pointing model with 70 stars was taken over an altitude range of 27deg-87 deg. The results from this model were better than for the 96 point model, so this is the one that will be used for this dark run. Here are the results: --------------- 70 point data set with one outlier removed fit to coeffs generated from 95 point data set. This is the model currently implemented. It didn't show as pronounced a discontinuity between start and finis as the 96 point model. The few test points tried after the model wa implemented indicated stars showing up within 5 arcseconds of the desired position. * inmod tdat:telmod DKA300:[TCC T 95 3.1002 IE -31.0482 IA -208.8288 AN -2.0489 AW -52.6705 HWCA2 -2.7035 HWSA2 +0.2570 HNCA1 +3.7683 HNSA1 +0.2713 CA +6.9723 PZZ1 -2.2293 ACEC -2.7672 ACES -6.8048 TX -2.5762 END * getdat pterr_20000820.dat;4 Read 69 data points * fit coeff change value sigma 1 IE -16.367 -47.41 1.393 2 IA +3.294 -205.53 1.539 3 AN -1.223 -3.27 0.489 4 AW -0.365 -53.04 0.473 5 HWCA2 +0.413 -2.29 0.605 6 HWSA2 +0.048 +0.30 0.662 7 HNCA1 -1.147 +2.62 0.729 8 HNSA1 -0.205 +0.07 0.727 9 CA -0.191 +6.78 1.152 10 PZZ1 -1.156 -3.39 3.970 11 ACEC +1.029 -1.74 0.853 12 ACES +2.153 -4.65 0.869 13 TX +0.633 -1.94 1.721 Sky RMS = 2.62 Popn SD = 2.91 --------------- The fiducial crossing record from the murmur log for tonight has been saved to /home/snedden/fid20000819.txt. Steph noticed that every few minutes on average, the murmur log would report "MS.ON is disabled for altitude; not applying". We are not sure if this is related to the 14 arcsec altitude error offset that we saw. If no corrections were made at all, we would think we would see cumulative errors for the altitude axis in the murmur log, which we don't. But it certainly would explain the offset. Occasionally the TCC would report that a slew had ended just before the azimuth axis reached its final destination. See the problems section for more detail. DATA ACQUISITION (see IOP/SOP output below): ============================================ IMAGING: -------- Run Type --- ---- none SPECTROSCOPY: ------------- Exposure Type -------- ---- none MIRRORS: ======== Values after collimation: PRIMARY: -------- MIGS Axial A= 1.9310 Axial B= 0.5585 Axial C= 0.5560 Transverse D= 0.4065 Lateral E= 1.9165 Lateral F= 0.4170 GALILS Commanded: 4751.,-2743.,591.,-10848.,14572.,14119 Actual: 4750., -2750., 600., -10850., 14550., 14100. SETMIR VALUES primDesOrient: 0.00, -2.30, 11.70, 640.50, 128.10 primOrient: 0.00, -2.28, 11.84, 639.70, 127.98 SECONDARY: ---------- Focus:-2550.00 Temp: 15.7 C Altitude: 28.4 deg MIGS Axial A= 2.5989 Axial B= 2.7039 Axial C= 2.6540 Transverse D= .1469 GALILS Commanded: -3390322.,-3428916.,-3358330.,-5611.,-10872. Actual: -3390138., -3430365., -3358863., -5600., -10850. SETMIR VALUES secDesOrient: -2692.86, -20.00, -8.00, 50.00, 74.10 secOrient: -2693.33, -20.13, -8.48, 49.57, 73.85 FOCUS LOG: ========== M1 Piston M2 Piston Temp Wind Time Inst setmir TCC setmir Az Alt C Dir MPH filt FWHM 00:30 engcam 0.0 -2550 -2846 13.7 80.6 16.2 268 6 ND2 1.2" 01:00 " 0.0 -2550 -2706 221.2 31.3 16.1 268 8 " ~4"* 01:30 " 0.0 -2525 -2723 12.9 77.0 15.2 341 11 " 1.3" 02:00 " 0.0 -2675 -2746 141.9 53.4 15.8 276 7 " 1.05" 02:40 " 0.0 -2550 -2733 293.1 66.2 15.7 269 4 " ~1* 04:50 " 0.0 -2570 -2840 167.1 25.9 16.0 261 2 " 2.0 05:15 " 0.0 -2570 -2795 297.2 52.1 15.9 272 2 " 0.8 *(focus off) LN2 SCHEDULE: ============= Spectros filled at 05:45. Weight 146 lb. Imager weight at 05:45= 179lb. WEATHER DATA: ============= Wind Time Temp F Dewp F MPH Direction Dust DIMM Sky Precip. ---- ----- ----- -------------- ---- ---- --- ------ 16:01 65 40 4 357 (N) 781 - pcl none 17:01 67 42 5 357 (N) 569 - pcl none 18:01 67 39 7 312 (NW) 398 - pcl none 19:01 65 36 4 350 (N) 317 - pcl none 20:01 62 39 4 355 (N) 344 - pcl none 21:01 63 38 6 337 (NNW) 310 1.5 pcl none 22:01 63 39 3 335 (NNW) 357 0.9 clear none 23:01 61 41 7 334 (NNW) 394 1.5 clear none 00:01 60 42 6 298 (WNW) 429 1.4 clear none 01:01 61 43 6 268 (W) 531 1.6 clear none 02:01 60 44 3 267 (W) 828 2.0 clear none 03:01 60 44 4 277 (W) 532 1.3 clear none 04:01 60 44 4 277 (W) 484 1.2 clear none 05:01 61 43 3 263 (W) 514 1.1 clear none [pmt]cl = partly, mostly, totally cloudy PROBLEMS: ========= TCC: ---- The "slew end" is sometimes displayed before the final azimuth position is reached (when azimuth is the last axis to reach the destination position). It is close to the final position...but not quite there yet. Here is an example: 0 0 I TCCStatus="SSS","NNY"; TCCPos=-10.64,66.98,-8.67; AxePos=-10.64,66.98,-8.67 0 0 I SpiderInstAng = -9.113357, -0.008826, 4473468261.05000 0 1 I Text="integrating and scanning guide image for reference star" 0 1 I MoveItems="YYYYYYYYY"; SlewEnd 0 0 I GPFindStar=1 0 0 I GCamCmd="doread 3.00 1 1 383.5 255.5 767.0 511.0" 0 0 I TCCStatus="TTT","NNY"; TCCPos=-10.65,66.98,-8.68; AxePos=-10.66,66.98,-8.68 A PR was filed.