Asteroid observations with the Hubble Space Telescope. II. Duplicity search and size measurements for 6 asteroids

Details Asteroid observations with the Hubble Space Telescope. II. Duplicity search and size measurements for 6 asteroids Asteroid observations with the Hubble Space Telescope. II. Duplicity search and size measurements for 6 asteroids

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...401..733t&link_type=abstract

Astronomy and Astrophysics, v.401, p.733-741 (2003)

Astronomy and Astrophysics

Astrophysics

10

Minor Planets, Asteroids, Methods: Observational

Scientific paper

We present the results of the observations of five Main Belt asteroids and one Trojan obtained using the Fine Guidance Sensors (FGS) of the Hubble Space Telescope. For each object, estimates of the spin axis orientation, angular size and overall shape, as well as possible indications of a binary structure, are derived. This enables the computation of new physical ephemerides. While the data concerning (63) Ausonia are clearly compatible with a three-axis ellipsoidal model, other objects show more complex shapes. (15) Eunomia, (43) Ariadne and (44) Nysa could in fact be double asteroids, or highly irregular bodies. The data concerning (624) Hektor are not conclusive as to its supposed binary nature, even if they agree with the signal of a single body. The results presented here strongly support the outstanding capabilities of the FGS for asteroid measurements, provided that the observations are performed over a sufficient time interval.
Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc. under contract No. NAS5-26555.
Figures 1 to 12 are only available in electronic form at http://www.edpsciences.org

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