6 Hebe

6 Hebe
Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)
Discoverer Karl Ludwig Hencke
Discovery date July 1, 1847
Alternate
designations
1947 JB B (http://cfa-www.harvard.edu/iau/MPDes.html)
Category Main belt
Orbital elements C (http://asteroid.lowell.edu/)
Epoch July 14, 2004 (JD 2453200.5)
Eccentricity (e) 0.201
Semi-major axis (a) 362.959 Gm (2.426 AU)
Perihelion (q) 289.958 Gm (1.938 AU)
Aphelion (Q) 435.960 Gm (2.914 AU)
Orbital period (P) 1380.373 d (3.78 a)
Mean orbital speed 19.12 km/s
Inclination (i) 14.765°
Longitude of the
ascending node
(Ω)
138.846°
Argument of
perihelion
(ω)
239.059°
Mean anomaly (M) 118.017°
Physical characteristics
Dimensions 185.2 km
Mass 6.7×1018 kg
Density 2 ? g/cm³
Surface gravity 0.0518 m/s²
Escape velocity 0.0979 km/s
Rotation period 0.3031 d1 (http://www.psi.edu/pds/archive/lc.html)
Spectral class S-type asteroid
Absolute magnitude 5.71
Albedo 0.268 2 (http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html)
Mean surface
temperature
~171 K

6 Hebe (hee'-bee) is a very large Main belt asteroid. It has a bright surface and composition of nickel-iron metals and silicate rocks.

Hebe was the sixth asteroid discovered, on July 1, 1847. It was the second and final asteroid discovery by Karl Ludwig Hencke, who had previously found 5 Astraea. The name "Hebe" was proposed by Carl Friedrich Gauss, and refers to the Greek goddess of youth, cupbearer for the gods of Mount Olympus until she was married to Heracles, at which point she was succeeded by the Trojan prince Ganymede.

On March 5, 1977 Hebe occulted Kaffaljidhma (γ Ceti), a moderately bright 3rd magnitude star. No other observed occultations by Hebe have been reported.

As a result of that occultation, a small satellite was reported by Paul D. Maley (4 (http://www.johnstonsarchive.net/astro/asteroidmoonsq.html)). It was nicknamed "Jebe" (see Heebie Jeebies). However, the discovery has not been confirmed.

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.)
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