6 Hebe
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A three-dimensional model of 6 Hebe based on its light curve
|
|
| Discovery | |
|---|---|
| Discovered by | Karl Ludwig Hencke |
| Discovery date | July 1, 1847 |
| Designations | |
| Pronunciation | /ˈhiːbiː/ HEE-bee |
|
Named after
|
Hēbē |
| 1947 JB | |
| Main belt | |
| Adjectives | Hebean |
| Orbital characteristics | |
| Epoch November 26, 2005 (JD 2453700.5) | |
| Aphelion | 2.914 AU (435.996 Gm) |
| Perihelion | 1.937 AU (289.705 Gm) |
| 2.426 AU (362.851 Gm) | |
| Eccentricity | 0.202 |
| 3.78 a (1379.756 d) | |
|
Average orbital speed
|
18.93 km/s |
| 247.947° | |
| Inclination | 14.751° |
| 138.752° | |
| 239.492° | |
| Proper orbital elements | |
|
Proper semi-major axis
|
2.4252710 AU |
|
Proper eccentricity
|
0.1584864 |
|
Proper inclination
|
14.3511092° |
|
Proper mean motion
|
95.303184 deg / yr |
|
Proper orbital period
|
3.77742 yr (1379.702 d) |
|
Precession of perihelion
|
31.568209 arcsec / yr |
|
Precession of the ascending node
|
−41.829042 arcsec / yr |
| Physical characteristics | |
| Dimensions | 205×185×170 km 186 km (mean) |
| 109 000 km2 | |
| Volume | 3 380 000 km3 |
| Mass | 1.28×1019 kg |
|
Mean density
|
3.81±0.26 g/cm³ |
| ~0.087 m/s2 | |
| ~0.13 km/s | |
| 0.3031 d | |
|
Equatorial rotation velocity
|
22.4 m/s |
| Albedo | 0.268 (geometric) |
| Temperature | ~170 K max: ~269 K (−4°C) |
|
Spectral type
|
S-type asteroid |
| 7.5 to 11.50 | |
| 5.71 | |
| 0.26" to 0.065" | |
6 Hebe (/ˈhiːbiː/ HEE-bee) is a large main-belt asteroid, containing around half a percent of the mass of the belt. However, due to its apparently high bulk density (greater than that of the Moon or even Mars), Hebe does not rank among the top twenty asteroids by volume. This high bulk density suggests an extremely solid body that has not been impacted by collisions, which is not typical of asteroids of its size – they tend to be loosely-bound rubble piles.
In brightness, Hebe is the fifth-brightest object in the asteroid belt after Vesta, Ceres, Iris, and Pallas. It has a mean opposition magnitude of +8.3, about equal to the mean brightness of Titan, and can reach +7.5 at an opposition near perihelion.
Hebe is probably the parent body of the H chondrite meteorites, which account for about 40% of all meteorites striking Earth.
Hebe was discovered on 1 July 1847 by Karl Ludwig Hencke, the sixth asteroid discovered. It was the second and final asteroid discovery by Hencke, after 5 Astraea. The name Hebe, goddess of youth, was proposed by Carl Friedrich Gauss.
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