Galileo support observations of Asteroid 951 Gaspra
1991; Institute of Physics; Volume: 102; Linguagem: Inglês
10.1086/115976
ISSN1538-3881
AutoresJeffrey D. Goldader, D. J. Tholen, D. P. Cruikshank, W. K. Hartmann,
Tópico(s)Gamma-ray bursts and supernovae
Resumoview Abstract Citations (16) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Galileo support observations of Asteroid 951 Gaspra Goldader, Jeffrey D. ; Tholen, David J. ; Cruikshank, Dale P. ; Hartmann, William K. Abstract 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. Publication: The Astronomical Journal Pub Date: October 1991 DOI: 10.1086/115976 Bibcode: 1991AJ....102.1503G Keywords: Asteroids; Astrometry; Galileo Spacecraft; Astronomical Photometry; Olivine; Planet Ephemerides; Planetary Composition; Pyroxenes; Astronomy full text sources ADS |
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