Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.576..329w&link_type=abstract
"Proceedings of the Gaia Symposium "The Three-Dimensional Universe with Gaia" (ESA SP-576). Held at the Observatoire de Paris-Me
Astronomy and Astrophysics
Astronomy
Gaia, Motion Detection, Velocity Estimation, Trend Testing, Neo, Asteroid
Scientific paper
Objects that are moving relative to the stars (e.g., NEOs) are potentially detectable in the Gaia field of view. This work investigates, from simulated data, how this detection can be performed in the astrometric field of view on the ground. The objective of this work is twofold: • to provide a `flag' (Boolean) for each astrometric field crossing of each object, indicating whether or not an object is moving. • to provide a first estimate of the velocity of the object at the time of the field crossing. This information is determined from data available onground from the crossing of one astrometric field of view. The work includes a `miniature comparative survey' of an array of applicable statistical methods from the fields of regression and trend testing, and an assessment of the velocity determination as a function of the magnitude and the kind of Solar System object, tested on a population of Main Belt asteroids, and on a simulated NEO population (Bottke et al. 2002). Due to the limited across-scan accuracy owing to the binning, the paper deals solely with along-scan data.
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