NationMaster - Encyclopedia: 11 Parthenope

**11 Parthenope**
Discovery
Discoverer	Annibale de Gasparis
Discovery Date	May 11, 1850
Alternate Designations
Category	Main belt
Orbital Elements Epoch July 14, 2004 (JD 2453200.5)
Eccentricity (e)	0.100
Semi-Major Axis (a)	366.896 G m (2.453 AU)
Perihelion (q)	330.297 Gm (2.208 AU)
Aphelion (Q)	403.494 Gm (2.697 AU)
Orbital Period (P)	1402.891 d (3.84 a)
Mean Orbital Speed	19.02 km/s
Inclination (i)	4.624�
Longitude of the Ascending Node (Ω)	125.637�
Argument of Perihelion (ω)	195.436�
Mean Anomaly (M)	333.562�
Physical Characteristics
Dimensions	153.3 km
Mass	5.13�10¹⁸ kg ^{1 (http://www.psi.edu/pds/archive/density.html)}
Density	2.72 g/cm� ^{1 (http://www.psi.edu/pds/archive/density.html)}
Surface Gravity	0.0578 m/s�
Escape Velocity	0.0941 km/s
Rotation Period	0.393 d ^{2 (http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm)}
Spectral Class	S-type asteroid
Absolute Magnitude	6.55
Albedo	0.180 ^{3 (http://dorothy.as.arizona.edu/DSN/IRAS/IMPS/diamalb.html)}
Mean Surface Temperature	~240 K

11 Parthenope ("par THEN o pay") is a large, bright Main belt asteroid. It is a mixture of metallic nickel-iron with magnesium- and iron silicates.

Parthenope was discovered by A. de Gasparis on May 11, 1850, his second of many 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 10 Hygiea in 1849" (De Gasparis, Annibale, The New Planet Parthenope, Monthly notices of the Royal Astronomical Society, Vol. 10, pp. 144–147 (May 1850) (http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1850MNRAS..10..145.&db_key=AST&high=40daf3f6f909335)).

There is so far one observed stellar occultation by Parthenope, on February 13, 1987.

This astronomy article is a stub. You can help Wikipedia by expanding it (http://en.wikipedia.org/w/index.php?title=11_Parthenope&action=edit).

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The Minor Planets

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Results from FactBites:

11 Parthenope (161 words)
	11 Parthenope (par-then'-a-pee) is a large, bright Main belt asteroid.
	Parthenope was discovered by A. de Gasparis on May 11, 1850, his second of many asteroid discoveries.
	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 10 Hygiea in 1849" (De Gasparis, Annibale, The New Planet Parthenope, Monthly notices of the Royal Astronomical Society, Vol.

11 Parthenope - Wikipedia, the free encyclopedia (166 words)
	11 Parthenope ( par-then'-a-pee) is a large, bright Main belt asteroid.
	It is a mixture of metallic nickel - iron with magnesium - and iron silicates.
	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 10 Hygiea in 1849 " ( De Gasparis, Annibale, The New Planet Parthenope, Monthly notices of the Royal Astronomical Society, Vol.

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