Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sass...28...85v&link_type=abstract
The Society for Astronomical Sciences 28th Annual Symposium on Telescope Science. Held May 19-21, 2009 at Big Bear Lake, CA. Pub
Astronomy and Astrophysics
Astronomy
Scientific paper
Our knowledge of an asteroid starts with determination of its position over time using astrometry, calculation of orbital parameters, and collection of time-series photometry data to reveal its lightcurve, rotational period, and amplitude. Selectively, radar studies are performed by Arecibo and Goldstone to obtain orbital, size, shape, and surface data. Further insight into asteroid populations, general taxonomic class, albedos, estimated diameters and shape require knowledge of their absolute magnitude (H) and phase slope parameter (G) values. The H-G values are determined through reduced photometric data as the asteroid passes through its opposition or 0° phase angle. Collection of these data is ideally suited to smaller observatories since the time required is considerable and therefore costly for larger facilities. The H-G parameters were determined for 901 Brunsia and 946 Poesia thereby yielding new insight into their absolute magnitudes, albedos, diameter, and general taxonomic classification.
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