Misplaced Pages

129 Antigone

Article snapshot taken from[REDACTED] with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
Main-belt asteroid

129 Antigone
A three-dimensional model of 129 Antigone based on its light curve.
Discovery
Discovered byChristian Heinrich Friedrich Peters
Discovery date5 February 1873
Designations
MPC designation(129) Antigone
Pronunciation/ænˈtɪɡəniː/
Named afterAntigone
Alternative designationsA873 CA; 1878 CA;
1907 BA
Minor planet categoryMain belt
Orbital characteristics
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc112.47 yr (41080 d)
Aphelion3.4773 AU (520.20 Gm)
Perihelion2.26344 AU (338.606 Gm)
Semi-major axis2.87038 AU (429.403 Gm)
Eccentricity0.21145
Orbital period (sidereal)4.86 yr (1776.3 d)
Average orbital speed17.39 km/s
Mean anomaly97.3536°
Mean motion0° 12 9.619 / day
Inclination12.262°
Longitude of ascending node135.703°
Argument of perihelion111.076°
Earth MOID1.2837 AU (192.04 Gm)
Jupiter MOID1.7487 AU (261.60 Gm)
TJupiter3.232
Physical characteristics
Dimensions113
119.44 ± 3.91 km
Mass(2.65 ± 0.89) × 10 kg
Mean density2.96 ± 1.04 g/cm
Equatorial surface gravity0.0349 m/s
Equatorial escape velocity0.0661 km/s
Synodic rotation period4.9572 h (0.20655 d)
Geometric albedo0.164
Temperature~164 K
Spectral typeM
Apparent magnitude9.71 (brightest?)
Absolute magnitude (H)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 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

  1. Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ Yeomans, Donald K., "129 Antigone", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
  3. ^ Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
  4. ^ Dotto, E.; et al. (June 1992), "M-type asteroids - Rotational properties of 16 objects", Astronomy and Astrophysics Supplement Series, vol. 95, no. 2, pp. 195–211, Bibcode:1992A&AS...95..195D.
  5. Johnston, Wm. Robert (17 February 2013), "Other Reports of Asteroid/TNO Companions", Johnston's Archive, retrieved 29 March 2013.
  6. Morrison, D.; Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal, vol. 204, pp. 934–939, Bibcode:2008mgm..conf.2594S, doi:10.1142/9789812834300_0469.
  7. 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, vol. 18, p. 797, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.

External links

Minor planets navigator
Small Solar System bodies
Minor planets
Asteroid
Distant minor planet
Comets
Other
Categories:
129 Antigone Add topic