390 Alma
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| Discovery A | |
|---|---|
| Discoverer | Guillaume Bigourdan |
| Discovery date | March 24, 1894 |
| Alternate designations B |
1894 BC; 1930 QW; 1950 BV; 1950 CH; 1953 YB; 1963 DF |
| Category | Main belt (Eunomia family) |
| Orbital elements C | |
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| Eccentricity (e) | 0.129 |
| Semi-major axis (a) | 396.89 Gm (2.653 AU) |
| Perihelion (q) | 345.512 Gm (2.31 AU) |
| Aphelion (Q) | 448.268 Gm (2.996 AU) |
| Orbital period (P) | 1578.364 d (4.32 a) |
| Mean orbital speed | 18.21 km/s |
| Inclination (i) | 12.144° |
| Longitude of the ascending node (Ω) |
305.342° |
| Argument of perihelion (ω) |
190.074° |
| Mean anomaly (M) | 258.381° |
| Physical characteristics D | |
| Dimensions | 24 km[1] |
| Mass | ~2×1016 kg (estimate) |
| Density | ~2.7 g/cm³ (estimate)[3] |
| Surface gravity | ~0.009 m/s² (estimate) |
| Escape velocity | ~0.015 km/s (estimate) |
| Rotation period | 0.156 d [2] |
| Spectral class | S-type asteroid |
| Absolute magnitude | 10.39 |
| Albedo (geometric) | 0.219 |
| Mean surface temperature |
~165 K max: 250 K (-23 °C) |
390 Alma is a typical medium sized Main belt asteroid.
It was Guillaume Bigourdan's only asteroid discovery. He discovered it on March 24, 1894 in Paris.
[edit] References
- PDS lightcurve data
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G. A. Krasinsky et al Hidden Mass in the Asteroid Belt, Icarus, Vol. 158, p. 98 (2002).
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