Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..749m&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
ISO observed between 1995 and 1998 more than 40 asteroids in great detail including some complete spectra from 2 to 200 micron and large samples of photometric measurements. The main results included the first direct measurement of the asteroid size-frequency distribution the establishment of meteorite-asteroid connections via characteristic mineralogic features and an improved thermophysical description of asteroids and their surfaces.
Through a recently developed thermophysical model the ISO observations were combined with visual photometry lightcurves close-up observations and direct measurement. In this way many applications were possible ranging from simple diameter and albedo determination of serendipitously seen asteroids to sophisticated studies of mineralogic aspects and regolith properties like emissivity roughness or thermal inertia for well-known asteroids. The possibility to combine all sources of information in one single model lead also to a better understanding and description of thermophysical effects like beaming or the before/after opposition effect. Thus the mineralogic signatures can be recognized easier and asteroid data from infrared surveys and individual IR photometry can be interpreted more accurately even in cases where shape or rotational behaviour are not known. Some well-studied asteroids are now even considered as excellent far-infrared calibrators.
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