234 Barbara

234 Barbara
Discovery
Discovered by C. H. F. Peters
Discovery date 12 August 1883
Designations
MPC designation (234) Barbara
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)
19.28 km/s
16.9454°
0° 16m 3.05s / day
Inclination 15.3746°
144.553°
192.344°
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

    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. 1 2 Yeomans, Donald K., "234 Barbara", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    2. 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.
    3. ↑ 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.
    4. ↑ "Powerful New Technique to Measure Asteroids' Sizes and Shapes". European Southern Observatory. Archived from the original on 19 December 2015. Retrieved 19 December 2015.
    5. ↑ Tanga, P; et al. "The non-convex shape of (234) Barbara, the first Barbarian". arXiv:1502.00460.


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