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87 Sylvia

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87 Sylvia
Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)
Discoverer Norman Robert Pogson
Discovery date May 16, 1866
Alternate
designations
A909 GA B (http://cfa-www.harvard.edu/iau/MPDes.html)
Category Main belt (Cybele)
Orbital elements C (http://asteroid.lowell.edu/)
Epoch July 14, 2004 (JD 2453200.5)
Eccentricity (e) 0.080
Semi-major axis (a) 522.137 Gm (3.490 AU)
Perihelion (q) 480.594 Gm (3.213 AU)
Aphelion (Q) 563.679 Gm (3.768 AU)
Orbital period (P) 2381.697 d (6.52 a)
Mean orbital speed 15.94 km/s
Inclination (i) 10.855
Longitude of the
ascending node
(Ω)
73.342
Argument of
perihelion
(ω)
266.195
Mean anomaly (M) 352.763
Physical characteristics
Dimensions 260.9 km
Mass 1.91019 kg
Density 2.0 g/cm
Surface gravity 0.0729 m/s
Escape velocity 0.1379 km/s
Rotation period 0.216 d 1 (http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm)
Spectral class X (Bus & Binzel, 2002)
Absolute magnitude 6.94
Albedo 0.0435 2 (http://www.psi.edu/pds/archive/astdata/ALBEDOS/albedos.tab)
Mean surface
temperature
~151 K

87 Sylvia (sil'-vee-a) is one of the largest main belt asteroids. It is very dark in color and has probably very primitive composition. It orbits beyond most of the main belt asteroids, so it was classed as one of the Cybeles (See Minor planet groups).

Sylvia was discovered by N. R. Pogson on May 16, 1866 from Madras (Chennai), India. The reason for its name remains uncertain. In the article (MNRAS, 1866) annoncing the discovery of this asteroid, Pogson explained that he selected the name in reference to Rhea Silvia, mother of Romulus and Remus. It has been claimed that it honours the first wife of astronomer Camille Flammarion, but there is no strong evidence for this.

A companion of Sylvia was discovered on February 18, 2001 from the Keck II telescope by Michael E. Brown and Jean-Luc Margot. It is 15 km in diameter and orbits at distance of 1370 km. No official name has been assigned to the satellite yet. [1] (http://cfa-www.harvard.edu/iauc/07500/07588.html)

The discovery of the satellite made possible an accurate measurement of the mass and density of Sylvia. Its density was found to be very low, indicating that the asteroid is probably very porous.

External links


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The minor planets
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(For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system)
(For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.)
de:Sylvia (Asteroid)

es:(87) Silvia fr:(87) Sylvia

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