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Enhancing MOS Relative Astrometry through 2MASS Cross-Correlation Techniques

This document discusses the advancements in relative astrometry for the MOS at EPIC. The goal is to improve the metrology by analyzing CCD offsets using cross-correlation with the 2MASS source list, which provides NIR data with an astrometric accuracy of less than 0.2". We aim to tune the new BORESIGHT CCF (v17) to identify potential systematic errors in both absolute and relative astrometry between EPICs. Observations suggest hints of systematic astrometry residuals and a potential offset between MOS1 and MOS2, possibly due to thermal bending effects.

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Enhancing MOS Relative Astrometry through 2MASS Cross-Correlation Techniques

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  1. EPIC astrometry update EPIC CAL/OPS meeting Vilspa, 23-24 March 2003 B. Altieri Bruno Altieri -- SCI-SDX

  2. 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. Bruno Altieri -- SCI-SDX

  3. Bruno Altieri -- SCI-SDX

  4. Bruno Altieri -- SCI-SDX

  5. Bruno Altieri -- SCI-SDX

  6. Systematic shift in MOS1 CCD6 MOS1 MOS2 Bruno Altieri -- SCI-SDX

  7. 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 Bruno Altieri -- SCI-SDX

  8. No residuals with old BORESIGHT CCF Bruno Altieri -- SCI-SDX

  9. Astrometry: an old job ! Nebra sky disc: “The oldest concrete representation of the stars in the world” 2002, Nebra, Germany, 3600 yr old Bruno Altieri -- SCI-SDX

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