1991 DA: an asteroid in a bizarre orbit

Details 1991 DA: an asteroid in a bizarre orbit 1991 DA: an asteroid in a bizarre orbit

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992acm..proc..573s&link_type=abstract

In Lunar and Planetary Inst., Asteroids, Comets, Meteors 1991 p 573-576 (SEE N93-19113 06-90)

Physics

3

Asteroids, Celestial Mechanics, Imaging Techniques, Inclination, Planetary Orbits, Atmospheric Attenuation, Comets, Numerical Integration, Spectroscopy

Scientific paper

Asteroidal object 1991 DA has an orbit of high inclination, crossing the planets from Mars to Uranus. This is unique for an asteroid, but not unusual for a comet of the Halley-type: it therefore seems likely that 1991 DA is an extinct or dormant comet. Previous CCD imaging has shown no indication of a coma; spectroscopic observations of 1991 DA which lack any evidence of strong comet-like emissions are reported. Numerical integrations of the orbit of this object were performed which show that is has been remarkably stable for the past approximately 20,000 yr, but chaotic before that. This may allow a new estimate to be made of the physical lifetimes of comets.

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