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| colspan="8" style="text-align:center;"|Perihelion distance<br/>at recent epochs

Discovery

The comet was discovered by Alphonse Borrelly during a routine search for comets at Marseille, France on 28 December 1904.

Exploration

Deep Space 1 flyby

thumb|left|Animation of Deep Space 1 trajectory from 24 October 1998 to 31 December 2003<br />

On 21 September 2001 the spacecraft Deep Space 1, which was launched to test new equipment in space, performed a flyby of Borrelly. It was steered toward the comet during the extended mission of the craft, and presented an unexpected bonus for the mission scientists. Despite the failure of a system that helped determine its orientation, Deep Space 1 managed to send back to Earth what were, at the time, the best images and other science data from a comet.

thumb|The orbits of three [[periodic comets, 1P/Halley, 19P/Borrelly and 153P/Ikeya-Zhang, set against the orbits of the outer planets.]]

Notes

References

  • 19P/Borrelly at Gary W. Kronk's Cometography
  • 19P/Borrelly at Kazuo Kinoshita's website
  • Elements and Ephemeris for 19P/Borrelly – Minor Planet Center