129 Antigone
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A three-dimensional model of 129 Antigone based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | Christian Heinrich Friedrich Peters |
| Discovery date | February 5, 1873 |
| Designations | |
Named after | Antigone |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 520.360 Gm (3.478 AU) |
| Perihelion | 337.731 Gm (2.258 AU) |
| 429.045 Gm (2.868 AU) | |
| Eccentricity | 0.213 |
| 1774.045 d (4.86 a) | |
Average orbital speed | 17.39 km/s |
| 110.610° | |
| Inclination | 12.218° |
| 136.437° | |
| 108.207° | |
| Physical characteristics | |
| Dimensions | 119.44 ± 3.91[2] km |
| Mass | (2.65 ± 0.89) × 1018 kg[2] |
Mean density | 2.96 ± 1.04[2] g/cm3 |
| 0.0349 m/s² | |
| 0.0661 km/s | |
| 4.9572[3] h | |
| Temperature | ~164 K |
Spectral type | M |
| 9.71 (brightest?) | |
| 7.07 | |
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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 German-American astronomer 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.[4] A model constructed from these shows Antigone itself to be quite regularly shaped. In 1990, the asteroid was observed from the Collurania-Teramo Observatory, allowing a composite light curve to be produced that showed a rotation period of 4.9572 ± 0.0001 hours and a brightness variation of 0.34 ± 0.01 in magnitude. The ratio of the lengths of the major to minor axes for this asteroid were found to be 1.45 ±0.02.[3]
10µ radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 114 km.[5] Since 1985, a total of three stellar occultations by Antigone have been observed. A favorable occultation of a star on April 11, 1985, was observed from sites near Pueblo, Colorado, allowing a diameter estimate of 113.0 ± 4.2 km to be calculated.[6]
References
- ↑ Yeomans, Donald K., "129 Antigone", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-29.
- 1 2 3 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- 1 2 Dotto, E.; et al. (June 1992), "M-type asteroids - Rotational properties of 16 objects", Astronomy and Astrophysics Supplement Series 95 (2), pp. 195–211, Bibcode:1992A&AS...95..195D.
- ↑ Johnston, Wm. Robert (February 17, 2013), "Other Reports of Asteroid/TNO Companions", Johnston's Archive, retrieved 2013-03-29.
- ↑ Morrison, D.; Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal 204, pp. 934–939, Bibcode:2008mgm..conf.2594S, doi:10.1142/9789812834300_0469.
- ↑ Wasserman, L. H.; et al. (June 1986), "The Occultation of AG + 20° 1138 by 129 Antigone on 11 April 1985", Bulletin of the American Astronomical Society 18, p. 797, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.
External links
- Orbital simulation from JPL (Java)
- Ephemeris
- 129 Antigone at the JPL Small-Body Database
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