Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dda....32.0406m&link_type=abstract
American Astronomical Society, DDA Meeting #32, #04.06; Bulletin of the American Astronomical Society, Vol. 33, p.1190
Astronomy and Astrophysics
Astronomy
Scientific paper
The scanning pattern of observations from a spin-stabilized, precessing astrometric spacecraft constrains the mission astrometric errors through the geometry that determines two distributions on the sky: the distribution of observation density and the distribution of scan angle (the angle of scan direction with respect to an ecliptic meridian through a given location). In this paper, the geometry underlying the distributions is presented. Then, assuming a given single-measurement error, simulated astrometric observations are accumulated on an equal-area grid on the sky. The behaviors of the astrometric error distributions are investigated as functions of the geometry control parameters: spin period, precession period, and precession cone angle (nominal angle between spin axis and Sun direction). Optimal values are determined for the specific case of the NASA MIDEX mission, FAME.
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