129 Antigone

Metallic main-belt asteroid September 2018 yes #D6D6D6 129 Antigone 129 Antigone.png A three-dimensional model of 129 Antigone based on its light curve on the top and an image of the asteroid on the bottom. Christian Heinrich Friedrich Peters 5 February 1873 (129) Antigone A873 CA; 1878 CA;1907 BA æ n ' t ɪ g ə n iːNoah Webster (1884) A Practical Dictionary of the English Language Antigone Main belt 31 July 2016 (JD 2457600.5) 2.87038 AU Gm on 2.26344 AU Gm on 3.4773 AU Gm on on 0.21145 4.86 yr (1776.3 d) 12.262° 135.703° 111.076° 97.3536° 17.39 km/s 119.44 ± 3.91 km (composite estimate)113 (2.65 ± 0.89) × 1018 kg (composite estimate)5.17 0.34 18 kgCalculated from its standard gravitational parameter GM = 0.345 0.023 km3 s2. 2.96 ± 1.04 g/cm3 (composite estimate)4.93 0.48 g/cm3Assuming a diameter of 126 ± 3 km. 0.0349 m/s2 0.0661 km/s 4.9572 h d on on M 9.71 (brightest?) 7.07 0.164 ~164 K 0.202672 ms / day 112.47 yr (41080 d) 0 1.2837 AU Gm on 1.7487 AU Gm on 3.232 129 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. Notes References Donald K. Yeomans 129 Antigone JPL Small-Body Database Browser NASA Jet Propulsion Laboratory https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=129 12 May 2016 . B. Carry Density of asteroids Planetary and Space Science 73 98–118 December 2012 10.1016/j.pss.2012.03.009 2012P&SS...73...98C . 1203.4336 See Table 1. Johnston Wm. Robert Other Reports of Asteroid/TNO Companions Johnston's Archive February 17, 2013 http://www.johnstonsarchive.net/astro/asteroidmoonsq.html 2013-03-29 . Wasserman L. H. Millis R. L. Franz O. 1 The Occultation of AG + 20° 1138 by 129 Antigone on 11 April 1985 Bulletin of the American Astronomical Society 18 797 June 1986 2012P&SS...73...98C . 1203.4336 10.1016/j.pss.2012.03.009 Dotto E. Barucci M. A. Fulchignoni M. di Martino M. Rotundi A. Burchi R. di Paolantonio A. 1 M-type asteroids - Rotational properties of 16 objects Astronomy and Astrophysics Supplement Series 95 2 195–211 June 1992 1992A&AS...95..195D . Morrison D. Chapman C. R. Radiometric diameters for an additional 22 asteroids Astrophysical Journal 204 934–939 March 1976 10.1142/9789812834300_0469 2008mgm..conf.2594S . Fuentes-Muñoz Oscar Farnocchia Davide Giorgini Jon D. Park Ryan S. 2025-12-01 Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release The Astronomical Journal 170 6 353 10.3847/1538-3881/ae0cc9 0004-6256 free 2025AJ....170..353F 283347135 External links 129 128 Nemesis 129 130 Elektra 000129 000129 000129 Category:Discoveries by Christian Peters Category:Named minor planets 000129 18730205