19P/Borrelly
periodic comet
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.
 | |
| Discovery | |
|---|---|
| Discovered by | Alphonse Borrelly |
| Discovery date | December 28, 1904 |
| Designations | |
| 1905 II; 1911 VIII; 1918 IV; 1925 VIII; 1932 IV; 1953 IV; 1960 V; 1967 VIII; 1974 VII; 1981 IV; 1987 XXXIII; 1994 XXX | |
| Orbital characteristics | |
| Epoch September 8, 2001 (JD 2452160.5) | |
| Aphelion | 5.83 AU |
| Perihelion | 1.35 AU (February 1, 2022)[1] |
| 3.59 AU | |
| Eccentricity | 0.624 |
| 6.8 a | |
| Inclination | 30.3° |
| Physical characteristics | |
| Dimensions | 8×4×4 km[2] |
Mean radius | 2.4 km[3] |
| Mass | 2×1013 kg[4] |
Mean density | 0.3 g/cm³[5] |
| Albedo | Albedo: 0.03[6] |
References
change- ↑ MPC
- ↑ 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. S2CID 122186063. Archived from the original on 2020-05-10. Retrieved 2008-12-16.
- ↑ "19P/Borrelly: Facts & Figures". Archived from the original on 2014-08-09. Retrieved 2014-08-08.
- ↑ 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" (PDF). Lunar and Planetary Science XXXVII. Archived (PDF) 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.
