234 Barbara

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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)
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[edit]

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[edit]

  1. ^ a b Yeomans, Donald K., "234 Barbara", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016. 
  2. ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336Freely accessible, 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:1502.00460Freely accessible. 

External links[edit]