LBC Collimation and CoPointing - 10 October 2011 UT

Observer(s): J. Hill (LBTO)
Telescope Operator: S. Allanson (LBTO)
Telescope Support: B. Bingham (LBTO)
Instrument Support: D. Officer (LBTO)
Software Suport: T. Sargent, M. Delapena, C. Biddick, T. Leibold

Summary

TCS testing on-sky with BP13 during the first half. BP13 seems ready for use as far as we could test with LBCs and RFBG.

We extensively tested non-sidereal presets in track mode with LBC. This is ready for prime time as you can see from the images of Comet Hill and asteroid 2011 SD173 taken at the end of the night. Non-sidereal guiding and Gregorian operation needs more testing.

In the second half, we got all the data Andrew wanted for LBC CoPointing and focus. The conditions were very stable in temperature and had good seeing.

Had a couple rotator errors, one telescope jump, and one hardpoint detent trip. (seems minor compared to Friday night)

Sky was clear with excellent seeing and stable temperatures near 2 degC.

Preparation

Details

TCS Testing BP13

These notes do not include the TCS test results.

With LBCs

Had a problem with IDL licenses when the 3 AO guys plus 2 M2 were already using 6 licenses.

02:02 N6949 from OSUmonitoring, not well focussed.

02:12 Blue guiding failed with RPC error.

02:21 Turn Off LBC, lbckill/lbcstart, Turn on LBC

02:27 DOFPIA

02:34 fast OB with 3 x 180 sec exposures with 30 arcsec dithers

02:41 guiding fails on both sides, both red and blue images are double with a separation of 15 arcsec. See 024009. Issue There was an AZ tracker error at 02:43:18.

02:52 Play fast OB again. Blue trackers had RPC error in addition to the jump.

03:05 lbckill/lbcstart

03:08 Blue Monocular N6946 with Red taking interesting psuedo images while not connected to the telescope.

NFS looks like it is having the old problem of not updating the directory buffer until two processes send a request.

With RFBG and AGW2

04:17 Tonight's M2 translations to correct pointing Xglob=+1.450 Yglob=+1.10 Zglob=0.738 (default) RX=78.3 RY=336.4 for default IE=4.7 CA=0.0

Got fooled for a while by "ABS" versus "abs" in Observe.offset. ABS and REL must be upper case for IIF to recognize them. Dave T. fixed the script for us in almost real time.

First non-sidereal tests

Guide star coords (gs=0) still have some wrinkles. Maybe we need to specify guide stars within range of the non-sidereal target.

06:40 Track mode preset at RFBG failed to get within 1 arcmin of Jupiter (we have not understood why). It works fine on a nearby pointing star. Move the guide probe to the center of the field manually to look at the object.

LBC Collimation and CoPointing

06:54 Reconfigure back to LBCs deployed

The collimation files is use (also attached below) are these:
-rw-r--r-- 1 telescope lbt       2031 Sep 24 09:48 DXPMLBCCollimation.20110918hybrid.dat
-rw-r--r-- 1 telescope lbt       2195 Sep 24 09:48 SXPMLBCCollimation.20110918hybrid.dat
-rw-r--r-- 1 telescope lbt       2195 Sep 24 09:50 SXPMLBCCollimation.dat
-rw-r--r-- 1 telescope lbt       2031 Sep 24 09:51 DXPMLBCCollimation.dat

LBC Non-Sidereal

07:20-07:25 See overexposed Jupiter on LBC (generally there, but precise pointing not confirmed).
Send software people home.

07:29 GD50_UsY

LBC Co-Pointing Corrections to Collimation Models as a Function of Elevation

07:32 WT10_280 at EL=67

07:36 DOFPIA

07:46 WT10_280 at EL=69

lbcrangebal (but instrument offset numbers on PSFGUI don't match what lbcrangebal printed)

07:51 WT10_280

remove all the instrument offsets in PSF and start afresh

07:54 WT10_280

SX: dX = 1.064 dY = 0.915 dRX = 19.622 dRY = -22.830 @ EL=71.5
DX: dX = -1.036 dY = -1.044 dRX = -22.395 dRY = 22.230

1.064 0.915 19.622 -22.830
-1.036 -1.044 -22.395 22.230

07:58 WT10_280 (looks OK)

08:00 WT10_295

SX: dX = -0.084 dY = -0.029 dRX = -0.620 dRY = 1.796 @ EL=83.1
DX: dX = 0.081 dY = 0.026 dRX = 0.552 dRY = -1.747

0.980 0.886 -0.020 19.00 -21.034
-0.955 -1.018 0.069 -21.84 20.48

08:07 ACT0278

SX: dX = -0.004 dY = 0.013 dRX = 0.281 dRY = 0.087 @ EL=77.1
DX: dX = 0.003 dY = -0.012 dRX = -0.263 dRY = -0.061

0.976 0.899 -0.020 19.28 -20.95
-0.952 -1.030 0.069 -22.11 20.42

08:12 WT10_280

SX: dX = 0.074 dY = 0.056 dRX = 1.203 dRY = -1.582 @ EL=74.5
DX: dX = -0.073 dY = -0.055 dRX = -1.188 dRY = 1.559

1.050 0.955 -0.020 20.49 -22.53
-1.025 -1.086 0.069 -23.29 21.98

08:17 ACT0263

Bogus corrections (John made a mistake in lbcrangebal) SX: dX = 0.219 dY = -0.082 dRX = -1.756 dRY = -4.695
DX: dX = -0.214 dY = 0.083 dRX = 1.783 dRY = 4.595

08:21 ACT0263 again

SX: dX = -0.129 dY = 0.041 dRX = 0.870 dRY = 2.777 @ EL=69.8
DX: dX = 0.128 dY = -0.041 dRX = -0.875 dRY = -2.745

1.140 0.914 -0.020 19.600 -24.45
-1.111 -1.043 0.069 -22.39 23.83

08:25 ACT0312

SX: dX = -0.053 dY = -0.008 dRX = -0.164 dRY = 1.134 @ EL=84.7
DX: dX = 0.052 dY = 0.007 dRX = 0.154 dRY = -1.107

1.087 0.906 -0.020 19.44 -23.31
-1.059 -1.036 0.069 -22.23 22.72

08:30 ACT0314

SX: dX = -0.034 dY = 0.037 dRX = 0.784 dRY = 0.729 @ EL=65.8
DX: dX = 0.041 dY = -0.038 dRX = -0.813 dRY = -0.876

1.053 0.942 -0.020 20.22 -22.59
-1.018 -1.074 0.069 -23.04 21.85

08:35 ACT0299

SX: dX = -0.050 dY = 0.066 dRX = 1.412 dRY = 1.072 @ EL=58.1
DX: dX = 0.066 dY = -0.078 dRX = -1.674 dRY = -1.412

1.003 1.008 -0.020 21.63 -21.51
-0.953 -1.152 0.069 -24.72 20.44

08:39 WT10_316

SX: dX = 0.124 dY = -0.032 dRX = -0.690 dRY = -2.659 @ EL=50.2
DX: dX = -0.098 dY = 0.002 dRX = 0.034 dRY = 2.094

1.127 0.976 -0.020 20.94 -24.17
-1.050 -1.151 0.069 -24.68 22.53

08:43 ACT0301 ---- restarted IRAF

SX: dX = -0.151 dY = 0.015 dRX = 0.323 dRY = 3.249 @ EL=41.9
DX: dX = 0.185 dY = -0.060 dRX = -1.288 dRY = -3.959

0.975 0.991 -0.020 21.26 -20.92
-0.866 -1.211 0.069 -25.97 18.57

08:53 ACT0318

SX: dX = 0.051 dY = -0.029 dRX = -0.630 dRY = -1.093 @ EL=31.8
DX: dX = 0.007 dY = -0.054 dRX = -1.153 dRY = -0.154

1.026 0.962 -0.020 20.63 -22.01
-0.858 -1.264 0.069 -27.12 18.42

08:57 WT10_216

SX: dX = 0.141 dY = -0.098 dRX = -2.104 dRY = -3.021 @ EL=21.2
DX: dX = -0.064 dY = -0.001 dRX = -0.026 dRY = 1.374

1.167 0.864 -0.020 18.53 -25.04
-0.922 -1.265 0.069 -27.150 19.79

OSU Monitoring and Tests of Rotator Trajectories

Photometric Sky but with lots of Moon

09:07 DOFPIA at N628

EL SX-Z DX-Z TEMP
67.6 1.324 0.738 2.25

09:13 OSUMONITORN628

Oops 300 sec exposures are saturated by moonlight, but the images look nice (subarcsec).

09:21 OSUMONITORN628 with exposures scaled by 0.5

Blue has the guide star on a hair. 150 sec Red images are still almost saturated.

09:39 DOFPIA @ N628

62.6 1.376 0.745 2.34

09:45 DOFPIA

41.6 1.394 0.893 2.34

09:53 OSUmonitorN2403 (aborted)

Tripped the torque limit switch on DX HP3. Went up to the cell to fix that.

10:25 DOFPIA

45.4 1.379 0.843 2.13

10:31 OSUmonitorN2403

10:41 ACT0329

10:43 DOFPIA

85.0 1.272 0.790 2.06

10:48 WT10_342

10:50 DOFPIA

75.1 1.229 0.737 2.05

10:54 ACT0340

10:55 DOFPIA

53.4 1.316 0.723 2.01

11:00 ACT0351

11:02 DOFPIA

31.2 1.315 09.32 2.00

11:06 WT10_323

11:08 DOFPIA

21.6 1.265 1.046 1.99

11:12 ACT0359

11:14 DOFPIA

59.4 1.385 0.737 1.97

queue NSI for Comet Hill C/2010 G2

11:20 load N2403, uncheck guiding, play OB (LBC is taking guider images) Red guide star seems to drift, but not the Blue guide star? Image headers say N2403. These are 120 sec exposures.

queue NSI for Comet Hill C/2010 G2

11:29 replay the same N2403 OB on Comet Hill

The stars are trailed in these open-loop images. See lbcb.20101010.113543.fits for example. Comets are fuzzy so harder to tell immediately if it is well tracked.

11:39 ACT0284 (unwrap)

11:44 DOFPIA - loads of pupils in the galactic plane!

79.5 1.239 0.724 1.86

queue NSI for asteroid Victoria

11:49 Play N2403 for Victoria without guiding, but the drift rate is very slow. We seem to be saturating the asteroid in some of the 120sec exposures. U-band is faint enough.

11:59 Play N2403 for Victoria without guiding,

queue NSI for asteroid 2011 SD173 (-5 to -7 on the Torino scale)

12:09 Play N2403 for 2011 SD173 without guiding

The moon has just set. Sky is photometric. We didn't refocus for this object. Seeing is 0.8 on the DIMM.

queue NSI for asteroid 2011 SD173 (-5 to -7 on the Torino scale)

12:19 Play N2403 for 2011 SD173 without guiding

Blinking images 121111 and 122003 clearly shows that the telescope is accurately tracking this fast moving asteroid. Non-sidereal LBC imaging is ready for prime time (w/o guiding). see the attached MPEG of two frames taken 10 min apart blinking. The asteroid is the one that does not move.

12:27 LBC RPC error on Red.

Close

12:30 Close for impending dawn. T=1.9degC.

-- JohnHill - 10 Oct 2011
Topic attachments
I Attachment Action Size Date Who Comment
DXPMLBCCollimation.datdat DXPMLBCCollimation.dat manage 1 K 10 Oct 2011 - 21:43 JohnHill DX collimation file for LBC
SD173.mpgmpg SD173.mpg manage 24 K 10 Oct 2011 - 12:52 JohnHill Two frames 10 minutes apart on asteroid 2011 SD173
SXPMLBCCollimation.datdat SXPMLBCCollimation.dat manage 2 K 10 Oct 2011 - 21:44 JohnHill SX Collimation file for LBC-Blue
Topic revision: r4 - 10 Oct 2011, JohnHill
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