(18) Melpomene
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Asteroid (18) Melpomene 
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| Properties of the orbit ( animation ) | |
| Orbit type | Main belt asteroid |
| Major semi-axis | 2.297 AU |
| eccentricity | 0.2177 |
| Perihelion - aphelion | 1.797 AU - 2.797 AU |
| Inclination of the orbit plane | 10.13 ° |
| Length of the ascending node | 150.4 ° |
| Argument of the periapsis | 228.0 ° |
| Time of passage of the perihelion | March 19, 2020 |
| Sidereal period | 3 a 175 d |
| Mean orbital velocity | 19.4 km / s |
| Physical Properties | |
| Medium diameter | approx. 140 km |
| Dimensions | 150 × 125 km |
| Dimensions | 2.9 x 10 18 kg |
| Albedo | 0.18 |
| Medium density | approx. 2 g / cm³ |
| Rotation period | 11.57 h |
| Absolute brightness | 6.51 mag |
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Spectral class (according to Tholen) |
S. |
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Spectral class (according to SMASSII) |
S. |
| history | |
| Explorer | John R. Hind |
| Date of discovery | June 24, 1852 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(18) Melpomene is an asteroid of the main asteroid belt discovered on June 24, 1852 as the eighteenth asteroid by John Russel Hind .
The celestial body was named after Melpomene , the muse of tragic poetry and funeral song.
Melpomene moves in an elliptical orbit around the sun . The asteroid is 1.8 AU away from the Sun in perihelion and 2.8 AU in aphelion . The orbit is inclined 10.1 ° to the ecliptic , the orbital eccentricity is 0.22.
Melpomene has a diameter of around 140 km. It has a relatively light, silicate-rich surface with an albedo of 0.22. During the opposition , Melpomene reaches a brightness of 10.6 mag .
Observations suggest that Melpomene is accompanied by a smaller asteroid.
See also
Individual evidence
- ↑ International Astronomical Union Circular No. 3315 , Retrieved June 19, 2010