Galileo support observations of Asteroid 951 Gaspra

Details Galileo support observations of Asteroid 951 Gaspra Galileo support observations of Asteroid 951 Gaspra

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1503g&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Oct. 1991, p. 1503-1509.

Astronomy and Astrophysics

Astronomy

14

Asteroids, Astrometry, Galileo Spacecraft, Astronomical Photometry, Olivine, Planet Ephemerides, Planetary Composition, Pyroxenes

Scientific paper

Observations of 951 Gaspra in support of the Galileo spacecraft encounter are reported. Photometric observations of the asteroid yield a synodic rotational period of 7.042 46 and a slope parameter G of 0.285 + or - 0.005. It is inferred from data obtained on May 18, 1990, that the subearth latitude was higher at that time than it was earlier in the opposition. This places a limit on the possible pole orientation of the asteroid. A slope parameter of 0.25 is proposed on the basis of a comparison of the present result for the slope parameter with that of Barucci et al. (1990). A low-quality 0.8-2.5-micron spectrum of 951 Gaspra suggests a high olivine/pyroxene ratio, which is indicative of a source region in the lower mantle of a differentiated asteroid, and similarities to 8 Flora and particularly 15 Eunomia.

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