Comet Borrelly

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Comet Borrelly Nucleus.jpg
Discovered by Alphonse Borrelly
Other 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
Reference date September 8, 2001 (JD 2452160.5)
Longest distance from the Sun 5.83 AU
Shortest distance from the Sun 1.35 AU
(May 28, 2015)[1]
Longest distance from the center of its orbital path
("semi-major axis")
3.59 AU
How long it takes to complete an orbit 6.8 a
Angle above the reference plane
Size and other qualities
Measurements 8×4×4 km[2]
Average radius 2.4 km[3]
Mass 2×1013 kg[4]
Average density 0.3 g/cm³[5]
How much light it reflects 0.03[6]

Comet Borrelly is a periodic comet. Periodic comets can only be seen from earth once every few years or decades. It was visited by the spacecraft Deep Space 1. Comet Borrelly was last seen from earth in September 2001 and will likely be seen again in July 2008.

References[change | change source]

  1. Seiichi Yoshida (2014-08-10). "19P/Borrelly". Seiichi Yoshida's Comet Catalog. Retrieved 2014-10-29.
  2. 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. doi:10.1086/375752. Retrieved 2008-12-16.
  4. Using the volume of an ellipsoid of 8x4x4km * a density of 0.3 g/cm³ yields a mass (m=d*v) of 2.0E+13 kg.
  5. 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.
  6. Robert Roy Britt (2001-11-29). "Comet Borrelly Puzzle: Darkest Object in the Solar System". Archived from the original on 22 January 2009. Retrieved 2008-12-16.