HST/FGS High Angular Resolution Observations of Binary Asteroids

Details HST/FGS High Angular Resolution Observations of Binary Asteroids HST/FGS High Angular Resolution Observations of Binary Asteroids

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6508h&link_type=abstract

American Astronomical Society, DPS meeting #38, #65.08; Bulletin of the American Astronomical Society, Vol. 38, p.615

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Binary or multiple asteroids are important bodies that provide insight into the physical properties of asteroids in general. The knowledge of the components orbit in a binary provides the total mass with high accuracy and generally permits a rough bulk-density estimate [1,2]. We have observed 10 selected binary or multiple asteroids (22 Kalliope, 45 Eugenia, 87 Sylvia, 90 Antiope, 107 Camilla, 121 Hermione, 283 Emma, 379 Huenna, 617 Patroclus, 762 Pulcova) with the HST/FGS interferometer in order to obtain high resolution data on the size and shape of their primaries (HST proposal ID 10614). All these systems except the Jupiter Trojan 617 Patroclus are located in the main-belt of asteroids. Combining these HST/FGS data to topographic models obtained from lightcurve inversion [3,4] yields the volume and hence the bulk density of these bodies with unprecedented accuracy [5]. This work will allow us to obtain important information on their internal structure, and insight into the possible gravitational re-accumulation process after a catastrophic disruptive collision [e.g. 6,7,8].In particular, one can see whether or not the surfaces of theses bodies closely follow an effective equipotential surface, and under what circumstances such a correspondence is or is not attained .
We will present the preliminary results for the data reduction and the size and bulk density determination.
[1] Merline et al. (2003). In: Asteroids III, pp 289.
[2] Marchis et al. (2005) ACM 2005, Buzios, Brazil.
[3] Kaasalainen et al. (2002) Icarus 159, 359.
[4] Torppa et al. (2003) Icarus 164, 346.
[5] Hestroffer et al. (2003) ACM 2002, ESA-SP 500, 493.
[6] Michel et al. (2004) P&SS 52, 1109.
[7] Durda et al. (2004) Icarus 167, 342.
[8] Paolicchi et al. (1993) Cel. Mech., 57, 49.

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