[Comm2011] Fwd: DomeFlats / ColdPixels report

[Konrad Kuijken]

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
>
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> sikkema at astro.rug.nl
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>
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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                         |
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