[Comm2011] OCAM2 daily log day 3

[Gijs Verdoes Kleijn]

Dear Jeffrey, Ewout, Gert, John,

Thanks John for the nightlog.
Jeffrey, could you inspect the 3x3 grid data? Answers we are looking for 
in order of priority:
-is the 3x3 grid of 5-point dithers as you expect?
and then:
-what is the astrometric quality of the coadd: talk to Kor and Erik Deul 
how to do this. And John, you might have advice how to proceed.
and finally:
-non-photomeric indeed?: come talk to Ewout/me if needed.

Ewout+Gert is looking into the 32 offsets. I propose Gert takes the lead 
in this so Ewout can concentrate on the polar field analysis.
Questions here are:
-32 positionings in order?
-exptime ok: enough standard stars.
-should data be repeated: data useful at all given non-photometric 
conditions?

Best wishes, Gijs

John P. McFarland wrote:
> Hi All,
>
> Tonight was quite a productive night.  Unfortunately the Toelner is 
> still not responding, so no new quick checks (despite the 51 test 
> quick checks) or 4-angle dome flats.  The problem will hopefully be 
> solved today.  Andrea, Koen, and Dietrich arrived tonight and worked 
> until around midnight when I took over.
>
> The conditions were relatively good with mostly excellent 0.5-0.7 
> arcsec seeing, but somewhat poor transparency.  It is difficult to say 
> which observations will be photometrically useful.  Several polar 
> field observations were obtained, so the variable conditions should be 
> seen there as well.  Complete 32 CCD offset observations in z and g 
> were obtained for SA107.  These are almost perfect compared to the 
> last nights' sets, but there was still some very light cirrus visible 
> on the all-sky cam during these.  Also, please check the 32 CCDs 
> exposures overlap for the center of the field.  The center was placed 
> on all the CCDs in the order that they are stored in the RawFitsData.
>
> A donut template was attempted for the VST people (requested by Koen), 
> but failed due to some template keyword error (Andrea and Koen will 
> have to investigate this).  Nonetheless, the focus offsets were done 
> and the required data secured.
>
> Following this, the night was wrapped up with a 3x3 grid from the 
> newest plate system centered on about the SA113 field, taken with 
> dither,N=5 in r for 60 seconds per exposure.  Please check these out 
> to make sure all the offsets were done correctly.
>
> Cheers,
>
>
> -=John
> ------------------------------------------------------------------------
>
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|dr Gijs Verdoes Kleijn         |   astronomer                     |
|e-mail: verdoes at astro.rug.nl   |   OmegaCEN / Kapteyn Institute / |
|www: www.astro.rug.nl/~verdoes |   Target                         |
|tel: +31-50-3638326            |   University of Groningen        |
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