| Proper Name | Borrelly | | Designation | 19P | | Orbital inclination to the ecliptic | 31.0° | | Orbital Period | 6 years, 285 days | | Distance from the Sun | Semi-Major Axis: 535,884,000 km (3.58 AU)
Perihelion: 197,180,000 km (1.32 AU)
Aphelion: 874,587,000 km (5.85 AU) | | Eccentricity | 3.5822 | | Notes | As a comet of the inner Solar System, the outward path of Comet Borrelly carries it barely beyond the orbit of Jupiter before it begins its return journey toward the Sun. This is one of very few comets that have visited by spacecraft, in this case the Deep Space 1 mission in the year 2001, which revealed the comet's nucleus to be a highly elongated and irreglar body measuring some eight kilometres along its longest axis. |
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