18 Melpomene

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18 Melpomene
Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)
Discoverer John Russell Hind
Discovery date June 24, 1852
Alternate
designations
  B (http://cfa-www.harvard.edu/iau/MPDes.html)
Category Main belt
Orbital elements C (http://asteroid.lowell.edu/)
Epoch October 22, 2004 (JD 2453300.5)
Eccentricity (e) 0.218
Semi-major axis (a) 343.443 Gm (2.296 AU)
Perihelion (q) 268.472 Gm (1.795 AU)
Aphelion (Q) 418.414 Gm (2.797 AU)
Orbital period (P) 1270.552 d (3.48 a)
Mean orbital speed 19.42 km/s
Inclination (i) 10.126°
Longitude of the
ascending node
(Ω)
150.547°
Argument of
perihelion
(ω)
227.975°
Mean anomaly (M) 205.245°
Physical characteristics
Dimensions 140.6 km (150×125)1 (http://web.media.mit.edu/~win/hstpub.pdf)
Mass 2.9×1018 kg
Density 2.0? g/cm³
Surface gravity 0.0393 m/s²
Escape velocity 0.0743 km/s
Rotation period 0.482 21 d (11.573 h) 2 (http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm)
Spectral class S
Absolute magnitude 6.51
Albedo 0.223 3 (http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html)
Mean surface
temperature
~189 K

18 Melpomene (mel-pom'-a-nee) is a large, bright Main belt asteroid. It is composed of silicates and metals.

It was discovered by J. R. Hind on June 24, 1852 and named after Melpomene, the Muse of tragedy in Greek mythology.

Melpomene occulted the star SAO 114159 on December 11, 1978. A possible satellite with a diameter at least 37 km was detected. The satellite candidate received a premilinary designation S/1978 (18) 1 [1] (http://cfa-www.harvard.edu/iauc/03300/03315.html).

Melpomene was observed with the Hubble Space Telescope in 1993. It was able to resolve the asteroid's slightly elongated shape, but no satellites were detected [2] (http://web.media.mit.edu/~win/hstpub.pdf).


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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.)
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