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129 Antigone
Main-belt asteroid
Main-belt asteroid
| Field | Value |
|---|---|
| minorplanet | yes |
| background | #D6D6D6 |
| name | 129 Antigone |
| image | 129 Antigone.png |
| caption | A three-dimensional model of 129 Antigone based on its light curve on the top and an image of the asteroid on the bottom. |
| discoverer | Christian Heinrich Friedrich Peters |
| discovered | 5 February 1873 |
| mpc_name | (129) Antigone |
| alt_names | A873 CA; 1878 CA; |
| 1907 BA | |
| pronounced | |
| named_after | Antigone |
| mp_category | Main belt |
| epoch | 31 July 2016 (JD 2457600.5) |
| orbit_ref | |
| semimajor | 2.87038 AU |
| perihelion | 2.26344 AU |
| aphelion | 3.4773 AU |
| eccentricity | 0.21145 |
| period | 4.86 yr (1776.3 d) |
| inclination | 12.262° |
| asc_node | 135.703° |
| arg_peri | 111.076° |
| mean_anomaly | 97.3536° |
| avg_speed | 17.39 km/s |
| dimensions | 113 |
| 119.44 ± 3.91 km | |
| mass | (2.65 ± 0.89) × 1018 kg |
| density | 2.96 ± 1.04 g/cm3 |
| surface_grav | 0.0349 m/s2 |
| escape_velocity | 0.0661 km/s |
| rotation | 4.9572 h |
| spectral_type | M |
| magnitude | 9.71 (brightest?) |
| abs_magnitude | 7.07 |
| albedo | 0.164 |
| single_temperature | ~164 K |
| mean_motion | / day |
| observation_arc | 112.47 yr (41080 d) |
| uncertainty | 0 |
| moid | 1.2837 AU |
| jupiter_moid | 1.7487 AU |
| tisserand | 3.232 |
1907 BA 119.44 ± 3.91 km
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. 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.
10μ radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 114 km. 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.
References
References
- Noah Webster (1884) ''A Practical Dictionary of the English Language''
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