11 Parthenope
From Wikipedia, the free encyclopedia
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Discovery
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| Discovered by | Annibale de Gasparis |
| Discovery date | May 11, 1850 |
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Designations
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| Alternative names | none |
| Minor planet category |
Main belt |
| Epoch July 14, 2004 (JD 2453200.5) | |
| Aphelion | 403.494 Gm (2.697 AU) |
| Perihelion | 330.297 Gm (2.208 AU) |
| Semi-major axis | 366.896 Gm (2.453 AU) |
| Eccentricity | 0.100 |
| Orbital period | 1402.891 d (3.84 a) |
| Average orbital speed | 19.02 km/s |
| Mean anomaly | 333.562° |
| Inclination | 4.624° |
| Longitude of ascending node | 125.637° |
| Argument of perihelion | 195.436° |
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Physical characteristics
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| Dimensions | 153.3 km |
| Mass | 5.13×1018 kg[1] |
| Mean density | 2.72 g/cm³[1] |
| Equatorial surface gravity | 0.0578 m/s² |
| Escape velocity | 0.0941 km/s |
| Rotation period | 0.393 d[2] |
| Albedo | 0.180 (geometric) [3] |
| Temperature | ~174 K |
| Spectral type | S-type asteroid |
| Apparent magnitude | 8.62 to 12.10 |
| Absolute magnitude | 6.55 |
| Angular diameter | 0.178" to 0.057" |
11 Parthenope (pronounced /pɑrˈθɛnəpi/, Greek: Παρθενόπη) is a large, bright Main belt asteroid.
Parthenope was discovered by Annibale de Gasparis on May 11, 1850, the second of his nine asteroid discoveries. It was named after one of the Sirens in Greek mythology, said to have founded the city of Naples. De Gasparis "used his utmost endeavours to realise a 'Parthenope' in the heavens, such being the name suggested by Sir John Herschel on the occasion of the discovery of Hygeia in 1849".[4]
There have been two observed Parthenopian occultations, on February 13, 1987, and April 28, 2006.
On August 6, 2008, during a perihelic opposition, Parthenope will shine at an apparent magnitude of 8.8.[5]
[edit] References
- ^ a b [1][dead link]
- ^ [2][dead link]
- ^ [3][dead link]
- ^ De Gasparis, Annibale (May 1850). "The New Planet Parthenope". Monthly notices of the Royal Astronomical Society 10: 144–147.
- ^ Bright Minor Planets 2008. Minor Planet Center. Retrieved on 2008-05-20.
[edit] External links
- Orbital simulation from JPL (Java) / Ephemeris
- IOTA (International Occultation Timing Association) occultation database
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