234 Barbara
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery date | 12 August 1883 |
| Designations | |
|
1942 RL1, 1953 RE, 1975 XP | |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 131.26 yr (47944 d) |
| Aphelion | 2.97153 AU (444.535 Gm) |
| Perihelion | 1.79939 AU (269.185 Gm) |
| 2.38546 AU (356.860 Gm) | |
| Eccentricity | 0.24569 |
| 3.68 yr (1345.7 d) | |
Average orbital speed | 19.28 km/s |
| 16.9454° | |
| 0° 16m 3.05s / day | |
| Inclination | 15.3746° |
| 144.553° | |
| 192.344° | |
| Earth MOID | 0.790978 AU (118.3286 Gm) |
| Jupiter MOID | 2.40797 AU (360.227 Gm) |
| Jupiter Tisserand parameter | 3.447 |
| Physical characteristics | |
| Dimensions |
43.75±1.0 km[1] 45.62 ± 1.93 km[2] |
| Mass | (0.44 ± 1.45) × 1018 kg[2] |
| 26.4744 h (1.10310 d) | |
| 0.2276±0.011 | |
| S | |
| 9.02 | |
|
| |
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]
Possible Binary Nature
Observations made in 2009 with ESO's Very Large Telescope Interferometer (VLTI) suggested that 234 Barbara may be a binary asteroid,[4] although a paper published in 2015 states that "the VLTI observations can be explained without the presence of a large satellite"[5]
References
- 1 2 Yeomans, Donald K., "234 Barbara", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
- 1 2 3 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 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), pp. 309–314, Bibcode:2008A&A...482..309G, doi:10.1051/0004-6361:20078965.
- ↑ "Powerful New Technique to Measure Asteroids' Sizes and Shapes". European Southern Observatory. Archived from the original on 19 December 2015. Retrieved 19 December 2015.
- ↑ Tanga, P; et al. "The non-convex shape of (234) Barbara, the first Barbarian". arXiv:1502.00460.
External links
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
- 234 Barbara at the JPL Small-Body Database
