234 Barbara
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| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery date | August 12, 1883 |
| Designations | |
| Alternative names |
1942 RL1, 1953 RE, 1975 XP |
| Minor planet category | Main belt |
| Orbital characteristics[1] | |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 444.054 Gm (2.968 AU) |
| Perihelion | 269.817 Gm (1.804 AU) |
| Semi-major axis | 356.935 Gm (2.386 AU) |
| Eccentricity | 0.244 |
| Orbital period | 1346.128 d (3.69 a) |
| Average orbital speed | 19.28 km/s |
| Mean anomaly | 333.976° |
| Inclination | 15.352° |
| Longitude of ascending node | 144.648° |
| Argument of perihelion | 192.212° |
| Physical characteristics | |
| Dimensions | 45.62 ± 1.93[2] km |
| Mass | (0.44 ± 1.45) × 1018[2] kg |
| Rotation period | 26.5 h |
| Albedo | 0.227 |
| Spectral type | S |
| Absolute magnitude (H) | 9.02 |
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234 Barbara is a main belt asteroid that was discovered by German-American astronomer Christian Heinrich Friedrich Peters on August 12, 1883 in Clinton, New York. It is classified as a stony S-type asteroid based upon its spectrum. The mean diameter is estimated as 45.6 km.[2]
Polarimetric study of this asteroid reveals anomalous properties that suggests the regolith consists of a mixture of low and high albedo material. This may have been caused by fragmentation of an asteroid substrate with the spectral properties of CO3/CV3 carbonaceous chondrites.[3]
In 2009, it was discovered that 234 Barbara might be a double asteroid.[4]
References
- ↑ Yeomans, Donald K., "234 Barbara", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-30.
- ↑ 2.0 2.1 2.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98-118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ↑ Gil-Hutton, R. et al. (April 2008), "New cases of unusual polarimetric behavior in asteroids", Astronomy and Astrophysics 482 (1): 309–314, Bibcode:2008A&A...482..309G, doi:10.1051/0004-6361:20078965.
- ↑ http://www.astronews.com/news/artikel/2009/02/0902-006.shtml (in German)
External links
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
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