The occultation of gamma Geminorum by the asteroid 381 Myrrha

Details The occultation of gamma Geminorum by the asteroid 381 Myrrha The occultation of gamma Geminorum by the asteroid 381 Myrrha

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1553s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 4, p. 1553-1561.

Astronomy and Astrophysics

Astronomy

5

Asteroids, Planetary Structure, Stellar Occultation, Axes Of Rotation, Diameters, Distance, Ellipticity, Position (Location), Shapes, Asteroids, Myrrha, Occultations, Astronomy, Size, Shape, Rotation, Physical Properties, Data, Astrometry, Earth-Based Observations, Calculations, Procedure

Scientific paper

The occultation of Gamma Geminorum by asteroid 381 Myrrha on January 13, 1991, observed in Japan and China, was the brightest event ever seen of a stellar occultation by an asteroid. By the analysis of the timing data of this event measured in Japan, it is shown that the cross section of Myrrha is well fitted with an ellipse of (147.2 +/- 2.4) km x (126.6 +/- 7.9) km. An upper limit of the diameter of Gamma Geminorum is also estimated to be 2.6 milliarcsec. The companion of Gamma Geminorum of about 7.5 mag was sited at separation (64 +/- 8) milliarcsec in the direction P = 129 deg +/- 59 deg, and the relative position of Myrrha to Gamma Geminorum was determined to an accuracy of about 1 milliarcsec. Direct constraints on Myrrha's 3D shape and the direction of its rotation axis are obtained on the assumption of it being a triaxial ellipsoid with isotropic orientation.

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