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Donati, Comet (C/1858 L1)


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A long-period comet discovered on 1858 June 2 by the Italian astronomer Giovanni Battista Donati (1826–73); formerly designated 1858 VI. In 1858 September it reached magnitude −1. Perihelion, 0.58 AU, was on 1858 September 30, with closest approach to Earth (0.5 AU) on October 9. Around this time the comet showed a prominent curved dust tail resembling a scimitar, for which it is famous. At best, this dust tail stretched for 60°, with two thin, straight ion tails at a tangent to it. The nucleus threw off shells of material as it rotated. The comet's orbit has a period of nearly 2000 years, eccentricity 0.996, and inclination 117°.0.

Subjects: Astronomy and Astrophysics.


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