Spots on 4-VESTA and 7-IRIS - Large Areas or Little Patches

Details Spots on 4-VESTA and 7-IRIS - Large Areas or Little Patches Spots on 4-VESTA and 7-IRIS - Large Areas or Little Patches

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as..101..621h&link_type=abstract

Astronomy and Astrophysics Supplement, Vol.101, NO. 3/NOVI, P. 621, 1993

Astronomy and Astrophysics

Astrophysics

4

Asteroids

Scientific paper

A composite lightcurve of (4) Vesta is presented which has been observed during the 1987/88 opposition. Some of its fine structures, which remained visible over the several months covered by observations, are identified and compared with earlier data from the literature. Similarly, lightcurves of the asteroid (7) Iris obtained in 1989 and 1991 are studied and compared with published photometric results at different aspect geometries. By the determination of lightcurve derivatives the distribution of the reflectivity over the surface is investigated, which is a powerful tool to distinguish the different scales of irregular structures on the surface of an asteroid. The 1991 observations cover an aspect geometry that has not been observed in detail for (7) Iris, and confirm earlier indications of a larger area of high reflectivity in the northern hemisphere of this object. Albedo markings are concentrated on both objects in larger regions but do not seem to be contiguous.

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