[Comm2011] Fwd: DomeFlats / ColdPixels report

[Jeffrey Bout]

In the hercules field is a magn 6.7 star:
http://www.flickr.com/photos/61231240@N02/5577038894/
http://www.flickr.com/photos/61231240@N02/5576453147/
this images are in r-band
Jeffrey


2011/3/30 Konrad Kuijken <kuijken at strw.leidenuniv.nl>:
> Great we can have this remote support!
> The FF gradients are slight shadows from the strips that cover the CCD
> bond wires. Not a serious concern I think. Were they any smaller we
> would get light reflecting off these shiny parts of the CCDs.
>
> Speaking of reflections: take a look at
> OMEGA.2011-03-28T06:12:56.124.fits      169.779167      13.31139        300.0000
> OMEGA.2011-03-28T06:19:35.168.fits      169.779167      13.31139        300.0000
> OMEGA.2011-03-28T06:26:25.942.fits      169.779167      13.31139        300.0000
> (Leo galaxy triplet)
> in which a V=7 star fell on he edge of the B and V filter cross
> covering the edges of the segments. I am actually quite amazed in
> general at the low level of ghosting we seem to be getting.
>
> Took the first KiDS field tonight, at RA,dec=120000, 000000. ugri, 5pt
> dithers each, nominal integration times. No guiding, but tracking is
> not bad. exposures with ORIGFILE names OBS089_0028 to 0047.
>
> Now back to collecting focusing runs etc to try to figure out how to
> (further) improve telescope optical quality.
>
> Koen
>
>
> On Mar 30, 2011, at 9:52, Gijs Verdoes Kleijn wrote:
>
>> Hi Ewout, FYI,
>>
>> Gijs
>>
>> -------- Originele bericht --------
>> Onderwerp:
>> DomeFlats / ColdPixels report
>> Datum:
>> Tue, 29 Mar 2011 18:36:03 +0200
>> Van:
>> G. Sikkema <sikkema at astro.rug.nl>
>> Aan:
>> Gijs Verdoes Kleijn <g.verdoes at astro.rug.nl>, "John P. McFarland" <mcfarland at astro.rug.nl
>> >, Jeffrey Bout <bout at astro.rug.nl>
>>
>>
>> report
>> DomeFlats:
>> -) chips 66 87 89 and 90 show some irregular patters. (in g)
>> -) all chips show a gradient near the border on one ore sometimes 2
>> sided with a gradient going from 1.00 --> 0.87
>>
>> ColdPixels:
>> counts coldpixels < 19000 for all chips.
>>
>> --
>> dr. Gert Sikkema
>>
>> Kapteyn Institute
>> Zernike Building, room 133
>> P.O. Box 800
>> 9700 AV Groningen
>> sikkema at astro.rug.nl
>> homepage: http://www.astro.rug.nl/~sikkema
>> 31-50-3634548
>> MSN: add: cubensi at hotmail.com to your MSN
>>
>> * Popular lectures on:
>> - Einstein's theory of Relativity
>> - Globular Clusters
>>
>>
>> --
>> --------------------------------------------------------------------
>> |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        |
>> |mobile: +31-654658050          |   postal address:                |
>> |                               |   Kapteyn Astronomical Institute |
>> |                               |   Postbus 800, 9700 AV, Groningen|
>> |                               |   The Netherlands                |
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