Accurate FASTT Positions and Magnitudes of Asteroids: 1997-1999 Observations

Details Accurate FASTT Positions and Magnitudes of Asteroids: 1997-1999 Observations Accurate FASTT Positions and Magnitudes of Asteroids: 1997-1999 Observations

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....120.2708s&link_type=abstract

The Astronomical Journal, Volume 120, Issue 5, pp. 2708-2720.

Astronomy and Astrophysics

Astronomy

5

Astrometry, Minor Planets, Asteroids

Scientific paper

This paper presents 56,256 positions of 1940 asteroids determined in 1997-1999. The CCD observations were taken with the Flagstaff Astrometric Scanning Transit Telescope (FASTT) and were reduced differentially to ICRF equatorial positions using reference stars taken from the ACT star catalog. Accuracies of +/-0.06" were achieved in each coordinate for well-exposed images which degrade to about +/-0.20" for the faintest asteroids observed (V~17.5). Similarly, magnitudes were determined with accuracies ranging from +/-0.03 to +/-0.11 mag. These observations provide a large database of accurate and homogeneously determined positions and magnitudes for most of the first 2000 numbered asteroids and other specially selected objects which can be used to calculate dynamical masses for asteroids, support spacecraft missions such as Near Earth Asteroid Rendezvous and Deep Space 1, significantly improve the accuracies of occultation predictions, and by using the photometry, investigate the shapes, binary statuses, precessions, and opposition effects for a large number of asteroids. This is an ongoing observational project, and some early results are reported. In particular, asteroids with diameters smaller than 75 km appear to be more irregular in shape than their larger counterparts.

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