390 Alma
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A three-dimensional model of 390 Alma based on its light curve.
|
|
| Discovery | |
|---|---|
| Discovered by | Guillaume Bigourdan |
| Discovery date | 24 March 1894 |
| Designations | |
|
Named after
|
Alma River |
| 1894 BC; 1930 QW; 1950 BV; 1950 CH; 1953 YB; 1963 DF |
|
| Main belt (Eunomia family) | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 122.02 yr (44568 d) |
| Aphelion | 3.00211 AU (449.109 Gm) |
| Perihelion | 2.29906 AU (343.934 Gm) |
| 2.65059 AU (396.523 Gm) | |
| Eccentricity | 0.13262 |
| 4.32 yr (1576.2 d) | |
|
Average orbital speed
|
18.21 km/s |
| 136.953° | |
| 0° 13m 42.229s / day | |
| Inclination | 12.1645° |
| 305.223° | |
| 190.194° | |
| Earth MOID | 1.31305 AU (196.429 Gm) |
| Jupiter MOID | 2.06833 AU (309.418 Gm) |
| Jupiter Tisserand parameter | 3.346 |
| Physical characteristics | |
| Dimensions | 23.74±1.4 km[1] 24 km[2] |
| Mass | ~2×1016 kg (estimate) |
|
Mean density
|
~2.7 g/cm³ (estimate)[3] |
|
Equatorial surface gravity
|
~0.009 m/s² (estimate) |
|
Equatorial escape velocity
|
~0.015 km/s (estimate) |
| 3.74 h (0.156 d)[1] 0.156 d[4] |
|
| 0.2190±0.029 | |
| Temperature | ~165 K max: 250 K (-23 °C) |
| S-type asteroid | |
| 10.39 | |
390 Alma is a typical medium-sized Eunomian asteroid.[citation needed][original research?] It was Guillaume Bigourdan's only asteroid discovery. He discovered it on March 24, 1894 in Paris.
References[edit]
- ^ a b c "390 Alma (1894 BC)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 10 May 2016.
- ^ "Supplemental IRAS Minor Planet Survey".
- ^ G. A. Krasinsky; et al. (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158: 98. doi:10.1006/icar.2002.6837.
- ^ "PDS lightcurve data".
External links[edit]
- 390 Alma at the JPL Small-Body Database
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