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-------- Original Message --------
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Subject: </th>
<td>An issue with OmegaCAM image quality (IQ) between March 22
- 30</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date: </th>
<td>Mon, 9 Apr 2012 11:02:27 +0200</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">From: </th>
<td>Mark Neeser <a class="moz-txt-link-rfc2396E" href="mailto:mneeser@eso.org"><mneeser@eso.org></a></td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">To: </th>
<td>Gijs Verdoes Kleijn <a class="moz-txt-link-rfc2396E" href="mailto:verdoes@astro.rug.nl"><verdoes@astro.rug.nl></a>,
<a class="moz-txt-link-abbreviated" href="mailto:jelte@strw.leidenuniv.nl">jelte@strw.leidenuniv.nl</a></td>
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<br>
Dear Gijs and Jelte,
<div><br>
</div>
<div><br>
</div>
<div>between about March 22 and 30, 2012 we experienced some severe
IQ degradation within VST/OmegaCAM.</div>
<div><br>
</div>
<div>This was due to a tilt of the focal plane with respect to the
detector, combined with a bad pointing offset (PPRS 044520). </div>
<div>Thomas Szeifert has temporarily solved this by updating the
reference positions for M2. The root cause is probably the M2
error that </div>
<div>occured on March 22 (PPRS 44431). We are investigating this
in order to prevent this from happening in the future.</div>
<div><br>
</div>
<div>In any case keep an eye on the data between these dates.</div>
<div><br>
</div>
<div><br>
</div>
<div>Cheers, and happy easter,</div>
<div><br>
</div>
<div><br>
</div>
<div>Mark</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<br>
<br>
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<div style="margin: 0px;">=======================================</div>
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<div style="margin: 0px;">Dr. Mark J. Neeser</div>
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<div style="margin: 0px; font: 11px Helvetica;
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class="Apple-style-span" style="font-size:
12px;">ESO - European Organisation for
Astronomical Research in the Southern
Hemisphere</span></div>
<div style="margin: 0px;">Karl-Schwarzschild-Strasse
2</div>
<div style="margin: 0px;">D-85748 Garching,
Germany</div>
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<div style="margin: 0px;">Tel: +49-89-3200-6874</div>
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<div style="margin: 0px;">email: <a
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<pre class="moz-signature" cols="72">--
--------------------------------------------------------------------
|dr Gijs Verdoes Kleijn | astronomer |
|e-mail: <a class="moz-txt-link-abbreviated" href="mailto:verdoes@astro.rug.nl">verdoes@astro.rug.nl</a> | OmegaCEN / Kapteyn Institute / |
|www: <a class="moz-txt-link-abbreviated" href="http://www.astro.rug.nl/~verdoes">www.astro.rug.nl/~verdoes</a> | Target |
|tel: +31-50-3638326 | University of Groningen |
|mobile: +31-654658050 | postal address: |
| | Kapteyn Astronomical Institute |
| | Postbus 800, 9700 AV, Groningen|
| | The Netherlands |
--------------------------------------------------------------------</pre>
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