129 Antigone
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Discovery
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| Discovered by | Christian Heinrich Friedrich Peters |
| Discovery date | February 5, 1873 |
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Designations
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| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 520.360 Gm (3.478 AU) |
| Perihelion | 337.731 Gm (2.258 AU) |
| Semi-major axis | 429.045 Gm (2.868 AU) |
| Eccentricity | 0.213 |
| Orbital period | 1774.045 d (4.86 a) |
| Average orbital speed | 17.39 km/s |
| Mean anomaly | 110.610° |
| Inclination | 12.218° |
| Longitude of ascending node | 136.437° |
| Argument of perihelion | 108.207° |
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Physical characteristics
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| Dimensions | 125.0 km |
| Mass | 2.0×1018 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0349 m/s² |
| Escape velocity | 0.0661 km/s |
| Rotation period | ? d |
| Albedo | ? |
| Temperature | ~164 K |
| Spectral type | M |
| Apparent magnitude | 9.71 (brightest?) |
| Absolute magnitude | 7.07 |
129 Antigone is a large main belt asteroid. Radar observations indicate that it is composed of almost pure nickel-iron. It and other similar asteroids probably originate from the core of a shattered Vesta-like planetesimal which had a differentiated interior. It was discovered by C. H. F. Peters on February 5, 1873 and named after Antigone, the Theban princess in Greek mythology.
In 1979 a possible satellite of Antigone was suggested based on lightcurve data [1]. A model constructed from these shows Antigone itself to be quite regularly shaped [2].
Since 1985, a total of three stellar occultations by Antigone have been observed.
[edit] External links
- Orbital simulation from JPL (Java) / Ephemeris
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