11 Parthenope

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11 Parthenope 11 Parthenope symbol.svg
Discovered by Annibale de Gasparis
Discovery date 11 May 1850
Pronunciation /pɑrˈθɛnəp/ par-THEN-ə-pee
Minor planet category Main belt
Adjectives Parthenopean /ˌpɑrθɨnəˈpən/,
Parthenopian /pɑrθɨˈnpiən/[1]
Orbital characteristics[2]
Epoch 14 July, 2004 (JD 2453200.5)
Aphelion 403.494 Gm (2.697 AU)
Perihelion 330.297 Gm (2.208 AU)
366.896 Gm (2.453 AU)
Eccentricity 0.100
1402.891 d (3.84 a)
19.02 km/s
Inclination 4.624°
Physical characteristics
Dimensions 153.3 ± 3.1 km (IRAS)[2]
Mass 6.15×1018 kg[3]
Mean density
3.28 ± 0.20 g/cm³[3]
0.0578 m/s²
0.0941 km/s
13.7204[2] h
Albedo 0.180 (geometric[2]
Temperature ~174 K
Spectral type
S-type asteroid[2]
8.68[4] to 12.16
0.178" to 0.057"

11 Parthenope[5] is a large, bright main-belt asteroid.

Parthenope was discovered by Annibale de Gasparis on 11 May 1850, the second of his nine asteroid discoveries. It was named after Parthenopē, 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 Hygiea in 1849".[6]

There have been two observed Parthenopian occultations, on 13 February 1987, and 28 April 2006.

On August 6, 2008, during a perihelic opposition, Parthenope had an apparent magnitude of 8.8.

In 1988 a search for satellites or dust orbiting this asteroid was performed using the UH88 telescope at the Mauna Kea Observatories, but the effort came up empty.[7]

Based upon a light curve that was generated from photometric observations of this asteroid at Pulkovo Observatory, it has a rotation period of 13.722 ± 0.001 hours and varies in brightness by 0.10 ± 0.0s in magnitude. The light curve displays three maxima and minima per cycle.[8] The JPL Small-Body Database lists a rotation period of 13.7204 hours.[2]


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[9] with a density of 3.3 g/cm³.[9] 2008 estimates by Baer suggest a mass of 6.15×1018.[3] The 1997 and 2001 estimates by Viateau and Rapaport were closer to 5×1018 kg with a density of 2.7 g/cm³.[9]

See also[edit]


  1. ^ "Parthenopean". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. , "Parthenopian". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. 
  2. ^ a b c d e f g "JPL Small-Body Database Browser: 11 Parthenope" (2008-08-04 last obs). Retrieved 2008-11-13. 
  3. ^ a b c Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. Retrieved 6 December 2008. 
  4. ^ "AstDys (11) Parthenope Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2010-06-26. 
  5. ^ Stressed on the second syllable, /pɑrˈθɛnəp/ par-THEN-ə-pee.
  6. ^ De Gasparis, Annibale (May 1850). "The New Planet Parthenope". Monthly notices of the Royal Astronomical Society 10: 144–147. Bibcode:1850MNRAS..10..145. 
  7. ^ Gradie, J.; Flynn, L. (March 1988), "A Search for Satellites and Dust Belts Around Asteroids: Negative Results", Abstracts of the Lunar and Planetary Science Conference 19: 405–406, Bibcode:1988LPI....19..405G. 
  8. ^ Pilcher, Frederick (October 2011), "Rotation Period Determinations for 11 Parthenope, 38 Leda, 111 Ate 194 Prokne, 217 Eudora, and 224 Oceana", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 38 (4): 183–185, Bibcode:2011MPBu...38..183P. 
  9. ^ 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. Retrieved 13 November 2008. 

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