Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://xmm.vilspa.esa.es/sas/8.0.0/doc/omichain/node31.html
Äàòà èçìåíåíèÿ: Wed Jul 2 12:00:24 2008
Äàòà èíäåêñèðîâàíèÿ: Fri Sep 5 20:49:17 2008
Êîäèðîâêà:
Ïîèñêîâûå ñëîâà: annular solar eclipse

Future developments

XMM-Newton Science Analysis System

omichain (omichain-1.51) [xmmsas_20080701_1801-8.0.0]

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Future developments

Presently, the tabulated source positions suffer from an unknown offset in RA and declination, which could be up to 10 arcsecs or more. The program omatt, which calculates the equatorial coordinates of the sources, can in fact calculate these offsets and correct the positions, but only if it has access to a star catalogue. Unfortunately, at present no catalogue is available and hence no correction can be applied. It is hoped that in the near future a catalogue will be provided with each ODF set, enabling an astrometric correction to be made.

**Figure 1:** The OM IMAGING CHAIN
$\begin{figure}\centering\epsfysize =12cm \epsfig{file=figure1.ps, height=12cm}\end{figure}$

**Figure 2:** The Tracking-History and Imagining Pipe-Lines (Part of the OM Imaging Chain)
$\begin{figure}\centering\epsfysize =12cm \epsfig{file=figure2.ps, height=12cm}\end{figure}$

XMM-Newton SOC/SSC -- 2008-07-02