Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...321..652m&link_type=abstract
Astronomy and Astrophysics, v.321, p.652-659
Astronomy and Astrophysics
Astrophysics
4
Asteroids, Meteorites, Planets: (7) Iris
Scientific paper
Rotationally resolved visible spectroscopy (6000~9500Å) of (7) Iris is presented. Within a few percents, no variation in Iris' visible spectrum over a rotational period has been found. These data suggest that the mineralogic properties of Iris' surface are globally homogeneous, although we cannot exclude the presence of some texture and/or albedo variegation as suggested by previous photometric and polarimetric studies available in the literature. From a dynamical point of view, we estimate the ejection velocity required for collisional fragments from this asteroid to be injected into the surrounding chaotic regions. The resulting velocity values are fairly high, but not incompatible with the values suggested by the present knowledge of catastrophic break-up phenomena and by the observational constraints put by asteroid families. Taking into account the close similarity between Iris' spectrum and that of (6) Hebe, a typical S(IV)-type object according with the most modern spectral classifications, we believe that (7) Iris may be a not negligible source of ordinary chondrite meteorites.
Cellino Alberto
di Martino Mario
Manara Allesandro
Migliorini Fabbio
Zappala Vincent
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