[Comm2011] Fwd: PPRS-049877-Updated-VST-OMEGACAM-Ellipticity in Atlas OB-Science Operations
Konrad Kuijken
kuijken at strw.leidenuniv.nl
Mon Mar 25 11:09:03 CET 2013
Begin forwarded message:
> From: Paranal_AREmail <esoarspl at eso.org>
> Subject: PPRS-049877-Updated-VST-OMEGACAM-Ellipticity in Atlas OB-Science Operations
> Date: March 23, 2013 23:00:27 GMT+01:00
> To: kuijken at strw.leidenuniv.nl
> Reply-To: Paranal_AREmail <esoarspl at eso.org>
>
> Problem number PPRS-049877 in the Paranal PRS has now been updated.
> The new details of the ticket are listed below.
> This is for your information only.
>
>
> Problem Number : PPRS-049877
>
> Creation Date : 2013-03-21 06:38:07 by N Jimenez (vst at eso.org)
> Type : Problem
> Keywords : Ellipticity in Atlas OB
> Priority : Necessary
> Deadline :
> Status : Assigned
>
> ----- Minor Change Section ---------------------
>
> -------------------------------------------------
>
> Location : VST
> Area/Instrument Type : INSTRUMENTS
> System/Instrument : OMEGACAM
> Sub-system : GUIDER & WFS
>
> Assigned to Group : Science Operations
> Assigned to Person : smieske
> CC List :
> Vst_Omega_Notification
> uweilenm at eso.org
> msterzik at eso.org
> vst at eso.org
> par-vst at eso.org
> acarlier at eso.org
> akaufer at eso.org
> par-tios at eso.org
> rholzloe at eso.org
> kuijken at strw.leidenuniv.nl
> Vst_all
>
> Telescope Downtime : 01:26
> Workload (hrs.) : 0
> Detailed Description :
> Doing OB 637837 with good stars selected and good AO corrections the IQ script resolved grade C and D due to ellipticity. Concatenation aborted and repeated with no problems. at the beginning, but then again the problem appeared. Target changed. Trying to acquire high air mass standard it was not posible to get adecuate corrections, coma was above 1500 and defocus near 800, so I decided to reset m2 values and do m2 init at about 04:25
> After reinitialization of m2 it performed fairly well concerning ellipticity and AO corrections. Other feature is that stars are constnatly drifting to out of rtd window when corrections are applied
> Time lost 01:26
> Thanks
> NJI
>
> 2013-03-21T03:16:52 637837 i_SDSS 0.92",10 1.08",19 1.10",20 0.90",10 0 1.00" -- 18.6 - 14.1 - - - - - - - - (637836) OT=0.93
> 2013-03-21T03:18:17 637837 i_SDSS 0.87", 4 0.92",12 0.92",14 0.86", 4 0 0.89" 0.94" 5.3 11.9 8.3 11.2 A B B A A A B (637836) 1.4 0.94 11.9 11.2 OT=0.83
> 2013-03-21T03:19:49 637840 i_SDSS 1.21",14 1.40",29 1.41",28 1.20",16 4 1.30" -- 15.2 - 21.5 - - - B - - - B (637836) OT=1.21 (DIMM=0.95) !?
> 2013-03-21T03:21:14 637840 i_SDSS 1.38",23 1.72",33 1.72",29 1.40",24 7!! 1.54" 1.42" 22.6 18.9 27.7 24.6 B B D A A A D (637836) 1.4 1.18 15.4 17.9 OT=1.43
>
> 2013-03-21T03:56:46 637849 i_SDSS 0.85", 8 1.03",20 1.08",22 0.88",13 2 0.96" -- 20.1 - 14.8 - - - B - - - B (637836) OT=0.92
> 2013-03-21T03:58:11 637849 i_SDSS 0.78", 6 0.92",15 0.92",16 0.79", 8 0 0.86" 0.91" 15.5 17.8 10.5 12.7 A B B A A A B (637836) 1.4 0.93 9.4 11.0 OT=0.82
> 2013-03-21T03:59:40 637852 i_SDSS 0.84", 9 0.94",20 1.02",22 0.86",15 2 0.92" -- 15.3 - 15.5 - - - B - - - B (637836) OT=0.88
> 2013-03-21T04:01:05 637852 i_SDSS 0.91",16 1.11",25 1.14",25 0.96",20 4 1.03" 0.97" 20.8 18.0 20.2 17.9 A B C A A A C (637836) 1.4 0.93 10.1 11.6 OT=0.98
> 2013-03-21T04:02:31 637855 i_SDSS 0.64", 3 0.71",10 0.72", 9 0.64", 6 0 0.69" -- 8.7 - 7.0 - - - - - - - - (637836) OT=0.66
> 2013-03-21T04:03:57 637855 i_SDSS 0.67", 6 0.78",12 0.79",12 0.68", 6 0 0.74" 0.71" 13.3 11.0 8.7 7.8 A B A A A A B (637836) 1.4 0.92 10.2 11.3 OT=0.71
> 2013-03-21T04:05:25 637858 i_SDSS 0.77", 9 0.98",19 1.02",23 0.79",12 1 0.89" -- 25.1 - 14.4 - - - B - - - B (637836) OT=0.85
> 2013-03-21T04:06:50 637858 i_SDSS 1.03",14 1.38",25 1.41",24 1.08",18 5!! 1.20" 1.04" 31.2 28.2 19.8 17.1 A B D A A A D (637836) 1.4 0.93 11.5 11.7 OT
> 2013-03-21T03:22:39 637843 i_SDSS 1.23",13 1.40",24 1.41",22 1.25",15 4 1.33" -- 14.1 - 18.8 - - - B - - - B (637836) OT=1.23
> 2013-03-21T03:24:04 637843 i_SDSS 1.18",10 1.33",22 1.32",24 1.21",12 4 1.26" 1.29" 11.8 12.9 17.2 18.0 A B C A A A C (637836) 1.4 1.22 14.6 17.9 OT=1.17
> 2013-03-21T03:25:33 637846 i_SDSS 1.07",12 1.32",29 1.31",28 1.07",18 4 1.19" -- 20.3 - 21.5 - - - B - - - B (637836) OT=1.10
> 2013-03-21T03:26:59 637846 i_SDSS 1.20", 9 1.33",27 1.28",22 1.15",12 4 1.23" 1.21" 11.7 16.0 17.7 19.6 A B C A A A C (637836) 1.4 1.21 14.9 18.4 OT=1.14
> 20
>
> ----- Worklog & Comments Section ---------------
>
> Worklog and Comments :
> 2013-03-21 12:22:00 fsalgado
> Assignee changed: smieske
> Assigned to Group Changed: Science Operations
> Status Changed: Assigned
> Modified By: fsalgado
> Modified Date: 2013-03-21 12:22:00
> Assignee changed: smieske
> Assigned to Group Changed: Science Operations
> Status Changed: Assigned
> Modified By: fsalgado
> Modified Date: 2013-03-21 12:22:00
> 2013-03-21 15:20:14 vst
> Here the log of the corrections measured and sent by OmegaCAM during the 'events'. The aquisitions converged slowly. Then, after the first Ob at 03:19:05 a last corrections is sent as measured during the science exposure. That one send a relatively large negative Coma, and leads then to a IQ degradation as is seen from the QC0 logs submitted by Nestor.
>
> When Nestor enforces an additional IA in the aquisition at 03:29, due to the degradation he sees, the system indeed measures a large positive coma value of 1500nm.
>
> The next correction in the aquisition at 03:42 again measures a huge defocus and coma, even though the science images between 03:30 and 03:42 were not affected by IQ degradation.
>
> It converges well around 03:45, but then IQ degradation restart around 03:56
>
> Mar 21 03:13:34 wocam seqWish: 2013-03-21 03:13:34.667468 wocam seq bob_ins 133 0 IA Iter 0: focmod=536.9, comamod=1148.6
> Mar 21 03:14:14 wocam seqWish: 2013-03-21 03:14:14.617877 wocam seq bob_ins 133 0 IA Iter 1: focmod=301.6, comamod=273.9
> Mar 21 03:14:56 wocam seqWish: 2013-03-21 03:14:56.566904 wocam seq bob_ins 133 0 IA Iter 2: focmod=395.5, comamod=481.8
> Mar 21 03:15:57 wocam seqWish: 2013-03-21 03:15:57.101787 wocam seq bob_ins 133 0 IA Iter 0: focmod=113.9, comamod=661.7
> Mar 21 03:16:39 wocam seqWish: 2013-03-21 03:16:39.047652 wocam seq bob_ins 133 0 IA Iter 1: focmod=16.3, comamod=431.0
> Mar 21 03:19:05 wocam seqWish: 2013-03-21 03:19:05.011756 wocam seq bob_ins 133 0 about to send WRTABER 0 289.0 0.0 0 0 -688.4 0 -203.0 0 0 -157.8 0 0.0 0 0 0 0 0, 0 0 0 0 0 -142.6 0 -74.8 0 0 -66.0 0 0.0 0 0 0 0 0
> Mar 21 03:29:50 wocam seqWish: 2013-03-21 03:29:50.327933 wocam seq bob_ins 133 0 IA Iter 0: focmod=141.3, comamod=1450.9
> Mar 21 03:30:31 wocam seqWish: 2013-03-21 03:30:31.529177 wocam seq bob_ins 133 0 IA Iter 1: focmod=443.8, comamod=148.3
> Mar 21 03:31:13 wocam seqWish: 2013-03-21 03:31:13.426351 wocam seq bob_ins 133 0 IA Iter 2: focmod=361.9, comamod=80.0
> Mar 21 03:32:12 wocam seqWish: 2013-03-21 03:32:12.498164 wocam seq bob_ins 133 0 IA Iter 0: focmod=10.0, comamod=200.7
> Mar 21 03:33:12 wocam seqWish: 2013-03-21 03:33:12.673557 wocam seq bob_ins 133 0 about to send WRTABER 0 81.5 0.0 0 0 -147.8 0 -78.6 0 0 -7.6 0 0.0 0 0 0 0 0, 0 0 0 0 0 -8.9 0 167.8 0 0 160.0 0 0.0 0 0 0 0 0
> Mar 21 03:42:34 wocam seqWish: 2013-03-21 03:42:34.514667 wocam seq bob_ins 133 0 IA Iter 0: focmod=1097.3, comamod=515.5
> Mar 21 03:43:17 wocam seqWish: 2013-03-21 03:43:17.460699 wocam seq bob_ins 133 0 IA Iter 1: focmod=304.3, comamod=1047.6
> Mar 21 03:43:59 wocam seqWish: 2013-03-21 03:43:59.412521 wocam seq bob_ins 133 0 IA Iter 2: focmod=182.7, comamod=691.8
> Mar 21 03:44:53 wocam seqWish: 2013-03-21 03:44:53.932228 wocam seq bob_ins 133 0 IA Iter 0: focmod=38.9, comamod=357.9
> Mar 21 03:47:21 wocam seqWish: 2013-03-21 03:47:21.616084 wocam seq bob_ins 133 0 about to send WRTABER 0 -56.0 0.0 0 0 -395.4 0 -67.7 0 0 -36.8 0 0.0 0 0 0 0 0, 0 0 0 0 0 -80.3 0 7.9 0 0 9.8 0 0.0 0 0 0 0 0
>
> Looking at the donut ocmiaxx.fits images (e.g. ocmia52.fits at the aquisition), the impression is that the flux of the star is relatively low, and one also sees that the donut is passing the limit of the box. I noted that the box size for IA star was 64x64. This should be 128x128.
>
> Will submit a separate ticket to have this kept at 128x128.
>
> Under investigation.
>
> Steffen
>
> 2013-03-23 18:48:15 vst
> I include Ronald Holzloehner from TEC into CC. He is interested / working in the optical modelling of the VST/OCAM system. This particular case of defocus would be the typical use case of when during open loop a degradation happens, partially because of slow focus drift, and also possibly because of a slight inaccuracy in the original alignment.
>
> I will make Ronald available the image analysis fits files, and the science data taken during that time.
>
> Further info to Ronald via email.
>
> Steffen
>
> Meaning of the IQ parameters as listed in the ticket worklog:
>
> DATE OB_ID filter FWHM,ellipticity[chips 65 76 85 96] NumberofChipsWithEllipticity>0.20 AvgFWHM IQvariation[outside_vs_inside] avgellipticity
> 2013-03-21T03:16:52 637837 i_SDSS 0.92",10 1.08",19 1.10",20 0.90",10 0 1.00" -- 18.6 - 14.1 - - - - - - - - (637836) OT=0.93
>
> Note that the pipeline reduces only 8 chips due to performance issues. The results thus refer to those 8 chips: 65,72,76,77,84,85,89,96
>
> The full QC0 script output [including the list as in the ticket text] is also available on
>
> par2gar at odyssey4:~OmegaCAM/QC0_logs/
>
> Date 2013-03-20
>
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