XMM Bruno Altieri -- SCI-SDX EPIC astrometry update EPIC CAL/OPS meeting Vilspa, 23-24 March 2003 B....
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Transcript of XMM Bruno Altieri -- SCI-SDX EPIC astrometry update EPIC CAL/OPS meeting Vilspa, 23-24 March 2003 B....
Bruno Altieri -- SCI-SDX
XMM
EPIC astrometry update
EPIC CAL/OPS meeting
Vilspa, 23-24 March 2003
B. Altieri
XMM-Newton
2
Bruno Altieri -- SCI-SDX
MOS metrology & astrometry
• Goal: improve MOS relative astrometry – MOS metrology in LINCOORD CCF : relative CCD offsets
• How : cross-correlate EPIC source list with 2MASS (NIR)– 2MASS astrometric accuracy < 0.2”
• Tune new BORESIGHT CCF (v17) for possible systematics in absolute astrometry and relative astrometry between EPICs.
XMM-Newton
7
Bruno Altieri -- SCI-SDX
Hint of systemic astrometry residuals
•Global astrometry shift tends to be in same direction in S/C frame
•But statistics is poor (nobs=14)
•Hint of offset between MOS1 and MOS2
•But correlation is not very good thermal bending effect ?or reaching limit of measurement accuracy