Investigations of oscillations in the brightness of Asteroid 1620 Geographer during its approach to the Earth in 1994

Details Investigations of oscillations in the brightness of Asteroid 1620 Geographer during its approach to the Earth in 1994 Investigations of oscillations in the brightness of Asteroid 1620 Geographer during its approach to the Earth in 1994

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997astl...23..758p&link_type=abstract

Astronomy Letters, Volume 23, Issue 6, November 1997, pp.758-767; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 870

Astronomy and Astrophysics

Astronomy

5

Scientific paper

Comprehensive investigations were conducted of Asteroid 1620 Geographer during its approach to the Earth in 1994. A frequency analysis of fine photometric effects and oscillations in its brightness was performed using data from a catalog of photometric observations of asteroids. This analysis confirms the monolithic nature of the very elongated body of the asteroid. In addition to the known rotation period of the asteroid, periods of 0.8d and 2.8d are detected, as well as multiples of these periods.The observed periodicity suggests that the first of these periods is associated with free precession of the rotation axis of the asteroid, while the second is due to forced precession with precession angle 3d +/- 1d. The free precession could have arisen either during the formation of the asteroid or during a collision with another body. The presence of forced precession and the fact that Geographer is associated with a meteor shower is consistent with the possible existence of modest-sized companions.

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