100P/Hartley

Author(s): DaveBowman2001

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100P/Hartley, also known as Hartley 1, is a Jupiter-family comet about 2.4 km in diameter. It has a current orbital period of 6.35 years, which is expected to make a close encounter with Earth by April 2164 at a distance of 0.49 AU

The orbits of 100P/Hartley from 1900 to 2200, with its current position (as of 2025) marked in green.

100P/Hartley as seen by Akimasa Nakamura from Japan in 1997

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