The BAA Observers' Workshops: An introduction to astrometry

Details The BAA Observers' Workshops: An introduction to astrometry The BAA Observers' Workshops: An introduction to astrometry

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jbaa..114...29j&link_type=abstract

Journal of the British Astronomical Association, vol.114, no.1, p.29-31

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To determine the orbit of an asteroid or any other solar system body we need to measure its position on the sky very accurately. Usually we need at least three well-spaced astrometric positions before we can compute the orbit. Astrometry is the process of making these accurate measurements at a given time. Good amateur astrometry has errors of less than one arcsecond in each coordinate, and an accuracy of 0.3 arcseconds is achievable with common amateur equipment and careful observation. This corresponds to the apparent diameter of a 10p piece placed almost 10 miles away! In this short introduction I will concentrate on the astrometry of asteroids, but similar techniques can be applied to comets and many other astronomical objects.

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