19P/Borrelly

Perihelion distance at recent epochs<ref name=MPC/>
Epoch	Perihelion (AU)
2028	1.310<ref name="Horizons2028"/>
2022	1.306
2015	1.349
2008	1.355

Comet Borrelly Template:IPAc-en or Borrelly's Comet (official designation: 19P/Borrelly) is a comet with a period of 6.85 years that was visited by the spacecraft Deep Space 1 in 2001. The comet last came to perihelion (closest approach to the Sun) on February 1, 2022<ref name=MPC/><ref name="Yoshida"/> and will next come to perihelion on December 11, 2028.<ref name="Horizons2028"/>

19P/Borrelly closest Earth approach on 2028-Dec-05

Date & time of closest approach	Earth distance (AU)	Sun distance (AU)	Velocity wrt Earth (km/s)	Velocity wrt Sun (km/s)	Uncertainty region (3-sigma)	Reference
2028-Dec-05 19:12 ± 6 min	Template:Convert	Template:Convert	17.3	33.3	± 35 thousand km	Horizons

Deep Space 1 returned images of the comet's nucleus from 3400 kilometers away. At 45 meters per pixel, it was the highest resolution view ever seen of a comet up until that time.<ref>Template:Cite web</ref>

Discovery

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

Exploration

Deep Space 1 flyby

File:Animation of Deep Space 1 trajectory.gif

Animation of Deep Space 1Template:'s trajectory from 24 October 1998 to 31 December 2003
Template:Legend2Template:·Template:Legend2Template:·Template:Legend2Template:·Template:Legend2

On September 21, 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. Template:Clear

File:Orbits of periodic comets.svg

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

External links

• Template:JPL Small Body
• http://jcometobs.web.fc2.com/pcmtn/0019p.htm
• 19P – Gary W. Kronk's Cometography
• Elements and Ephemeris for 19P/Borrelly – Minor Planet Center