[Comm2011] CCD93

[Olaf Iwert]

Dear all,

For the time being, the conclusion is a broken video cable on the 
outside of the cryostat.
Therefore I think for the time being studying further exposures is not 
necessary.

With best wishes
Olaf

-- 
Olaf Iwert
ESO - European Organisation for Astronomical Research in the Southern Hemisphere
Karl-Schwarzschild-Strasse 2,  D-85748 Garching bei Muenchen,  Germany
Email: oiwert at eso.org    Tel: +49 89 32006353    Fax: +49 89 32006489


On 13.09.2011 16:08, Konrad Kuijken wrote:
> Hi Ewout,
>
> I had just come to the same conclusion.
> Olaf, I hope this helps your diagnosis...
>
> K
>
> On Sep 13, 2011, at 15:58, Ewout M. Helmich wrote:
>
>> Hi Koen,
>>
>> I hope it's visible in the attachment. I simply plotted the USNO on the top of CCD93. It seems to me that the stars are where they should be, but that the pixel values are somehow inverted. So, it's not crosstalk as such.
>>
>> Regards,
>> Ewout
>>
>> On 09/13/2011 03:34 PM, Konrad Kuijken wrote:
>>> I took a quick look at the negative crosstalk that is now evident in ccd93 since the problems began. Bizarly it does not seem to come from CCD 94, 95 or 96! As an example I looked at
>>> OMEGA.2011-09-12T02:36:26.148.fits.fz, which is a 5-sec r band exposure on sky. Lots of negative stars in ccd93, but none correspond to the positions of objects on 94,95,96.
>>> I have not had a chance to look if it corresponds to another ccd, or whether the pattern is shifted somehow.
>>>
>>> K
>>>
>>>
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>> <ccd93_stars.jpg>