PartnerObserving Log for 2007 June 23-24

Observer: J. Hill
LBC Support: A. DiPaola, R. Speziali
Telescope Operator: D. Gonzalez

Last night of technical observing before summer telescope engineering activities. Running with the optical fiber Profibus connection to LBC-Blue for the first time in many months.

02:44 0.2 sec test dome flat in U

02:47 Open Dome - T=14degC D=-2degC Wind 3.6m/sec from WSW. Sky clear above 10 deg elevation.

02:47 - 5 bias

B Sky Flats

02:58 - SkyFlatTestB [52000]
02:59 - SkyFlatTestB x1.5 [58000]
03:00 - SkyFlatB_5 x1.5 [46000, ......., 25000]
03:04 - SkyFlatBrot90_5 x2 [25000, ......,14000]
03:09 - SkyFlatBrot180_5 x8 [42000, ......., 24000]
03:13 - SkyFlatBrot270_5 x16 [37000, ......., 21000]
03:20 - SkyFlatB_5 x30 [......14000]

Move to PG1323; Clear Active Optics Corrections from previous nights.

03:31 - Vfastextra: (too bright)
03:34 - Vfastextra: (still too bright, maybe the moon?)

Move to M81

03:42 - Vfastextra (no good pupils) Z4=-2000, Z7=-1000, Z11=+300 manually
03:45 - Vfastextra: (no good pupils) Z4=-2000, Z7=-1000, Z11=+100 manually
03:48 - Vfastextra: (no good pupils) Z4=-2000, Z7=-500, Z8=+500, Z11=+100 manually
03:51 - Vfastextra: (no good pupils) Z4=+4000 (I was going the wrong way!)
03:55 - Vfastextra x2: 5863 0 0 0 0 0 sent
03:57 - Vfastextra x2: -111 274 -747 -474 1315 1000 sent
03:59 - Vfastextra x2: -1418 274 -498 56 -745 -23 sent

04:02 - M81V at EL=36.0 deg - [5000 counts background] Image 1 has 1.2 arcsec seeing at 1.7 airmasses. Later 1.4 - 1.5 arcsec.

04:11 - Vfastextra: -814 62 318 490 25 -153 sent

04:13 - M81V at EL=35.3 deg - [5000 counts background] Image 1 is 1.1 arcsec at 1.74 airmasses.

Move to A2199 at EL=73 for Vfastextra versus Bfastextra

04:26 - Vfastextra: -581 -1207 474 176 -480 -30 sent
04:28 - Vfastextra: 148 -374 179 35 -156 -42 sent 62.13 pix
04:30 - Vfastextra: -30 271 233 77 -64 -53 sent 61.14 pix
04:31 - Vfastextra: -177 -321 -214 9 57 26 sent 60.33 pix

04:33 - Bfastextra**: -586 106 244 44 -62 -142 (not sent) 58.07 pix
04:35 - Bfastextra**: -709 73 207 -21 -157 20 (not sent) 57.40 pix
04:36 - Bfastextra**: -644 -204 147 9 -20 -118 (not sent) 57.76 pix

04:37 - Vfastextra: -373 21 -286 12 -152 -51 sent 59.25 pix
04:39 - Vfastextra: -31 169 405 17 44 -6 sent 61.14 pix

04:41 - Vsuperfoc pos=0 (finefoc for all chips) to confirm last night's measurements.

SX Xt=-2.020 Yt=-0.348 Zt=0.204 RXt=18.2 RYt=30 at EL=76.6
derived from Xg=0 Yg=0.566 Zg=-0.900 RXg=+20 RYg=0

04:45 - Vsuperfoc pos=180

04:51 -V5sec x20 still on A2199 (887,3395)

set SX dRY=-40 arcsec dX=+1.784 making the total:
Xt=-0.292 Yt=-0.269 Zt=+0.056 RX=17.8 RY=-10 at el=79.2

04:59 - V5sec x20 still on A2199 (1000, 3547)

set azoffset = +120 (maybe 1.20 arcsec by mistake?)

05:07 - V5sec x20 still on A2199 (1011, 3542)

Pointing Stars for Co-Pointing Work on Red and Blue

First we figure out which way various motions move the star image.

Move to pointing star at Az=167 El=76

05:21 - V1sec (890,2998) [Blue center is 1048, 2957]

azoffset=0 (the default)

05:26 - V1sec (888, 2986)

05:29 - V1sec (888, 2980)

SX RYg=0 Xg=0 (reversing the changes from above)

05:33 - V1sec (1070, 2972) at Rot=0 Az=180

05:39 Edit LBCLEFTpointingmodel.dat to change CA from +24.5743 to +0.5743 arcsec/radian. Stop and start PCS on lbtmu104 to implement the change.

05:42 - V1sec (1172, 3002)

SX RYg=-40 arcsec Xg=+1.784 (This is the right direction to move Blue toward Red pointing.)

05:46 - V1sec (991, 2980) at Rot=11 Az=194 El=76.0

SX RYg=-30 Xg=+1.338 (We overcorrected the effect of dropping the CA term, so back down a bit.)

05:51 - V1sec (1031, 2990)

Move to pointing star Az=162 El=40

05:55 - V1sec (1028, 2954)

Move to pointing star Az=172 El=31

06:05 - V1sec (1029, 2950)

Move to pointing star Az=168.7 El=19.2

06:09 - V1sec (1035, 2946) with globular cluster!

set azoffset=150

06:27 - V1sec (1657, 2861) >>> Red centroid (393,288) [Red Center is 550,220] [Red rotator angle is + or - 90. Stars drift from top to bottom.]

SX Xt=0.973 Yt=0.198 Zt=2.227 RX=27 RY=0

Move to pointing star Az=168.5 El=59.8

Strategy: Adjust MCSPU azoffset to place the star near (~100 pixels) the Red rotator center on the Electrim. Then repoint Sx/Blue to approach that pointing with the BLue rotator center.

set azoffset=180

06:50 -V1sec (1436, 2908) >>> Red centroid (275,232)

Move to pointing star Az=6 El=85

set azoffset=720

07:02 - V1sec (838, 2866) >>> Red centroid (301,197)

Xg=0.0 RYg=0 results in:
SX Xt=-2.197 Yt=-0.052 Zt=-0.354 RX=16.7 RY=30

07:11 - V1sec (683, 2966) He was fooled by being in North where rotator angle is 180! Went wrong way.

Xg=+3.568 RYg=80 = This setting makes RED and BLUE point within an arcminute at high elevation! results in:
SX Xt=1.373 Yt=-0.056 Zt=-0.351 RX=16.8 RY=-50

07:17 - V1sec (1007, 2907)

set azoffset = 0

07:21 - V1sec (1226, 2768)

Pointing Model CA back to its normal +24.5743

07:24 - V1sec (1288, 2683)

Move to field of HETE J1900.1-2455

Can't get to Xt position here (because of +2.6 m limit) with Xg=3.568 RY=-80 at EL=31.6, so change back to Xg=2.676 RY=-60

07:33 - Vfastextra: -3262 0 0 0 0 0 sent
07:36 - Vfastextra: -320 584 -270 390 486 -3 sent
07:39 - Vfastextra: 147 574 -633 187 226 25 sent

07:42 - HETEJ1900 - We are at 1.9 airmasses. Image is bouncing around all over the place while changing from 1.5 to 3 arcsec. First dither is 1.8 arcsec at 1.9 airmasses. Second dither is 1.5 arcsec FWHM. Guiding failed on dither 5, but it can't be for lack of stars. Dither 5 was 1.4 arcsec at 1.87 airmasses.

08:03 - HETEJ1900 pass 2 - Dither 3 was 1.2 arcsec.

08:24 - Vfastextra: -807 296 107 137 -55 -34 sent

SX Xt=2.126 Yt=-0.007 Zt=1.556 RX=25.5 RY=-30 at EL=31.6

LBC-Blue Filter Hardware Failure at 08:27:10 - Timeout error on motion. Filter is more than 10 times the maximum.... Turn LBC off and back on.

08:33 - HETEJ1900 pass 3 - Dither 1 is 1.1 arcsec at 1.9 airmasses!

08:54 - HETEJ1900 pass 4 - Dither 1 is 1.3 arcsec at 1.9 airmasses.

Move to the field of M92

09:21 - Vfastextra: 171 -697 500 436 -178 -138 sent
09:23 - Vfastextra: -136 2 126 4 -46 -160 sent

09:26 - M92_deepU_F2_7 - Seeing was sub-arcsec, but blows up to 2.5 arcsec 2/3 of the way through the first exposure. Net image size was 1.4 arcsec FWHM at 1.25 airmasses. The primary was not refocussed mid-exposure.

10:00 - Vfastextra: 328 -254 -430 -36 160 -26 sent

10:04 - M92_deepR_F2_7 - Guider is struggling to cancel the image motion. Dither 1 is 1.4 arcsec FWHM at 1.4 airmasses. Had to pause and restart the third dither when the telescope stopped tracking (the first such event of the night). See Issue 703. Lost 5 minutes.

10:24 - M92_deepR_F2_6 - Seeing and image motion have settled down now. Dither 3 is 1.5 arcsec.

LBC UI had a soft freeze at 10:30:17.

Move to Asteroid 17081 @ El=48

10:47 - Vfastextra: -25 79 133 -52 -30 -62 sent

10:50 - JT_20070624 = Asteroid 17081, 60sec by 10-dither. Images are ~1.2 arcsec at 1.3 airmasses. The asteroid is at (766,3083) on the first frame. Twilight background is rising, so we'll just keep going with flats on this same field.

Dither Offsets for the above images (for a star near the field center):
Image Xpix Ypix FWHM Xarcsec Yarcsec
105010 796.53 3682.25 5.97 0.0 0.0
105152 527.99 3156.15 4.88 -60.7 -118.9
105350 1060.93 4206.28 5.16 59.8 118.4
105541 267.32 3948.21 5.39 -119.6 60.1
105743 1317.69 3416.16 5.81 117.8 -60.1
105931 921.81 3809.29 4.57 28.3 28.7
110117 1180.37 3280.26 5.20 86.7 -90.8
110311 655.45 4339.83 6.52 -31.9 148.6
110458 389.01 3550.47 7.13 -92.1 -29.8
Where the dithers were even multiples of 30 arcsec.

R Sky Flats

11:09 - SkyFlatR_5 x60 [7000, ......, 16000]
11:18 - SkyFlatRrot90_5 x60 [23000, ....., saturated]
11:29 - SkyFlatRrot180_5 x20 [37000, ...... then drop to x10 ....., 49000]
11:36 - SkyFlatRrot270_5 x5 [40000, ....., then drop to x2 ....., 34000]
11:41 - SkyFlatR_5 x1 [22000, ....., 43000]

Close

11:48 Close Dome - T=11.5 degC, D=-2.3degC Wind 1.3 m/sec from West. Photometric.

25 bias

Next Activity for LBC-Blue

Roberto S. dismounted the shutter and took it back to Rome to be rebuilt, so no LBC observing until September.

Next Activity for Co-Pointing:

After I build a new SX collimation model based on this data, then we need to make a pointing model for both mirrors (or at least update the zeropoints for now). Oops, we should have observed at least one star field with the pointing log on. Then we'll want to make another iteration on the collimation models after studying the field aberrations of both Red and Blue (in September).

-- JohnHill - 24 Jun 2007
Topic revision: r7 - 21 Jul 2009, NormCushing
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