Astrometric and photometric estimators for TYCHO photon counts

Details Astrometric and photometric estimators for TYCHO photon counts Astrometric and photometric estimators for TYCHO photon counts

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...147..227y&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 147, no. 2, June 1985, p. 227-236. Research supported by the Danish Space Boar

Astronomy and Astrophysics

Astronomy

12

Astrometry, Astronomical Photometry, Estimators, Hipparcos Satellite, Spaceborne Astronomy, Computerized Simulation, Cross Correlation, Least Squares Method, Maximum Likelihood Estimates, Variance (Statistics)

Scientific paper

The performance of different astrometric and photometric estimators is studied with the purpose of optimizing the evaluation of photon counts from the TYCHO space astrometry experiment on board the HIPPARCOS satellite. Theoretical values of the performance are confirmed by numerical simulations. A numerical filter method is developed to solve the normal equations of the Maximum-Likelihood method. This method requires orders of magnitude less computing time than the exact method.

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