11 Parthenope
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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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| Alternate name(s) | none |
| Minor planet category |
Main belt |
| Adjective | Parthenopean, Parthenopian |
| 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 ± 3.1 km (IRAS)[1] |
| Mass | 6.15×1018 kg[2] |
| Mean density | 3.28 ± 0.20 g/cm³[2] |
| Equatorial surface gravity | 0.0578 m/s² |
| Escape velocity | 0.0941 km/s |
| Rotation period | 0.3929 d (9.43 h)[1][3] |
| Albedo | 0.180 (geometric) [1] |
| Temperature | ~174 K |
| Spectral type | S-type asteroid[1] |
| Apparent magnitude | 8.68[4] to 12.16 |
| Absolute magnitude (H) | 6.55[1] |
| Angular diameter | 0.178" to 0.057" |
11 Parthenope (
/pɑrˈθɛnəpiː/ par-THEN-ə-pee; 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".[5]
There have been two observed Parthenopian occultations, on February 13, 1987, and April 28, 2006.
On August 6, 2008, during a perihelic opposition, Parthenope had an apparent magnitude of 8.8.
[edit] Mass
In 2007, Baer and Chesley calculated a higher mass and density for Parthenope based on perturbations by the 90 km asteroid 17 Thetis. Baer and Chesley calculated a mass of 6.3×1018 kg[6] with a density of 3.3 g/cm³.[6] 2008 estimates by Baer suggest a mass of 6.15×1018.[2] The 1997 and 2001 estimates by Viateau and Rapaport were closer to 5×1018 kg with a density of 2.7 g/cm³.[6]
[edit] Notes
- ^ a b c d e f "JPL Small-Body Database Browser: 11 Parthenope". 2008-08-04 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=11. Retrieved 2008-11-13.
- ^ a b c Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. http://home.earthlink.net/~jimbaer1/astmass.txt. Retrieved 2008-12-06.
- ^ "Lightcurves and Map Data on Numbered Asteroids N° 1 to 52225". AstroSurf. Archived from the original on 2005-11-27. http://web.archive.org/web/20051127063200/http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm. Retrieved 2008-11-03.
- ^ "AstDys (11) Parthenope Ephemerides". Department of Mathematics, University of Pisa, Italy. http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.1&n=11&oc=500&y0=2031&m0=7&d0=29&h0=00&mi0=00&y1=2031&m1=7&d1=29&h1=00&mi1=00&ti=1.0&tiu=days. Retrieved 2010-06-26.
- ^ De Gasparis, Annibale (May 1850). "The New Planet Parthenope". Monthly notices of the Royal Astronomical Society 10: 144–147. Bibcode 1850MNRAS..10..145..
- ^ a b c Baer, James; Steven R. Chesley (2008). "Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris" (PDF). Celestial Mechanics and Dynamical Astronomy (Springer Science+Business Media B.V. 2007) 100 (2008): 27–42. Bibcode 2008CeMDA.100...27B. doi:10.1007/s10569-007-9103-8. http://www.springerlink.com/content/h747307j43863228/fulltext.pdf. Retrieved 2008-11-13.
[edit] External links
- Orbital simulation from JPL (Java)
- Ephemeris
- IOTA (International Occultation Timing Association) occultation database
- 2011-Jan-26 Occultation / (2011 Asteroidal Occultation Results for North America)
- "Elements and Ephemeris for (11) Parthenope". Minor Planet Center. http://scully.cfa.harvard.edu/cgi-bin/returnprepeph.cgi?d=b2011&o=00011. (displays Elong from Sun and V mag for 2011)
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