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11: Photographic Astrometry

[ "article:topic-guide", "authorname:tatumj", "Astrometry", "showtoc:no" ]
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  • Astrometry is the art and science of measuring positions of celestial objects, and indeed the first step in determining the orbit of a new asteroid or comet is to obtain a set of good astrometric positions. For much of the twentieth century, most astrometric positions were determined photographically.

    Thumbnail: Motion of barycenter of solar system relative to the Sun. Carl Smith derivative work: Rubik-wuerfel