Adaptive optics observations of the binary system (22) Kalliope: a three dimensional orbit solution

Details Adaptive optics observations of the binary system (22) Kalliope: a three dimensional orbit solution Adaptive optics observations of the binary system (22) Kalliope: a three dimensional orbit solution

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500..725m&link_type=abstract

In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed

Computer Science

1

Asteroids: Composition, Infrared Observations, Interiors, Orbits

Scientific paper

We carried out new observations of the binary asteroid (22) Kalliope (S/2001 (22)) with the Shane 3-m telescope of the Lick observatory in October and November 2001. With a FWHM (full width at half maximum) of 0".2, Kalliope (apparent size of about 0".15) was not resolved but it was possible to separate the secondary from its primary. As observations spanned a few days time, they are well distributed along the secondary's orbit allowing us to accurately estimate its orbit. The satellite orbits (22) Kalliope in a retrograde manner, on a highly inclined (i = 160°±2) and eccentric orbit (e = 0.28±0.06) with an orbital period of 3.57±0.14 days. The semimajor axis is 1024±40 km. Using Kalliope's diameter as determined from IRAS data, the M-type asteroid's bulk density is about 2.19±0.20 g/cm3, suggestive of a highly porous body. The measured precession rate of the secondary's orbit is much higher than expected from Kalliope's oblateness, assuming a homogeneous body (constant density). This suggests that Kalliope may be more elongated than presently believed or/and that its internal structure is maybe highly inhomogeneous, perhaps caused by macroscopic porosity characteristics of a rubble-pile body.

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