A three-dimensional model of 129 Antigone based on its light curve.
|Discovered by||Christian Heinrich Friedrich Peters|
|Discovery date||5 February 1873|
|Epoch 31 July 2016 (JD 2457600.5)|
|Uncertainty parameter 0|
|Observation arc||112.47 yr (41080 d)|
|Aphelion||3.4773 AU (520.20 Gm)|
|Perihelion||2.26344 AU (338.606 Gm)|
|2.87038 AU (429.403 Gm)|
|4.86 yr (1776.3 d)|
Average orbital speed
|0° 12m 9.619s / day|
|Earth MOID||1.2837 AU (192.04 Gm)|
|Jupiter MOID||1.7487 AU (261.60 Gm)|
119.44 ± 3.91 km
|Mass||(2.65 ± 0.89) × 1018 kg|
|2.96 ± 1.04 g/cm3|
Equatorial surface gravity
Equatorial escape velocity
|4.9572 h (0.20655 d)|
Antigone (minor planet designation: 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.
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