|Discovered by||Alphonse Borrelly|
|Alternative names||1905 II; 1911 VIII; 1918 IV;
1925 VIII; 1932 IV; 1953 IV;
1960 V; 1967 VIII; 1974 VII;
1981 IV; 1987 XXXIII; 1994 XXX
|Epoch September 8, 2001 (JD 2452160.5)|
|Semi-major axis||3.59 AU|
|Orbital period||6.8 a|
|Mean density||0.3 g/cm³|
Deep Space 1 flyby
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.
- Weaver, H. A.; Stern, S.A.; Parker, J. Wm. (2003). "Hubble Space Telescope STIS Observations of Comet 19P/BORRELLY during the Deep Space 1 Encounter". The American Astronomical Society 126 (1): 444–451. Bibcode:2003AJ....126..444W. doi:10.1086/375752. Retrieved 2008-12-16.
- Using the volume of an ellipsoid of 8x4x4km * a rubble pile density of 0.3 g/cm³ yields a mass (m=d*v) of 2.0E+13 kg.
- D. T. Britt; G. J. Consol-magno SJ; W. J. Merline (2006). "Small Body Density and Porosity: New Data, New Insights". Lunar and Planetary Science XXXVII. Archived from the original on 17 December 2008. Retrieved 2008-12-16.
- Robert Roy Britt (2001-11-29). "Comet Borrelly Puzzle: Darkest Object in the Solar System". Space.com. Archived from the original on 22 January 2009. Retrieved 2008-12-16.
|Periodic comets (by number)|
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