V-type asteroid
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A V-type (volcanic-type) asteroid, or Vestoid, is an asteroid whose spectral type is that of 4 Vesta. Approximately 6% of main-belt asteroids are vestoids,[citation needed] with Vesta being by far the largest of them. They are relatively bright, and rather similar to the more common S-type asteroid, which are also made up of stony irons and ordinary chondrites, with V-types containing more pyroxene than S-types.
A large proportion of vestoids have orbital elements similar to those of Vesta, either close enough to be part of the Vesta family, or having similar eccentricities and inclinations but with a semi-major axis lying between about 2.18 AU and the 3:1 Kirkwood gap at 2.50 AU. This suggests that they originated as fragments of Vesta's crust. There seem to be two populations of Vestoids, one created 2 billion years ago and the other 1 billion years ago, coming respectively from the enormous southern-hemisphere craters Veneneia and Rheasilvia.[1] Fragments that ended up in the 3:1 Jupiter resonance were perturbed out of the Kirkwood gap and some fragments eventually hit the earth as HED meteorites.
The electromagnetic spectrum has a very strong absorption feature longward of 0.75 μm, another feature around 1 μm and is very red shortwards of 0.7 μm. The visible wavelength spectrum of the V-type asteroids (including 4 Vesta itself) is similar to the spectra of basaltic achondrite HED meteorites.
A J-type has been suggested for asteroids having a particularly strong 1 μm absorption band similar to diogenite meteorites,[2] likely being derived from deeper parts of the crust of 4 Vesta.
Distribution
[edit]The vast majority of V-type asteroids are members of the Vesta family along with Vesta itself. There are some Mars-crossers such as 9969 Braille, and some Near-Earth objects like 3908 Nyx.
There is also a scattered group of objects in the general vicinity of the Vesta family but not part of it. These include:
- 809 Lundia — Orbits within the Flora family region
- 956 Elisa
- 1459 Magnya — Orbits in the outer asteroid belt, too far from Vesta to be genetically related.[citation needed] May be the remains of a different ancient differentiated body that was shattered long ago.
- 2113 Ehrdni
- 2442 Corbett
- 2566 Kirghizia
- 2579 Spartacus — Contains a significant portion of olivine, which may indicate origin deeper within Vestoid than other V-types.
- 2640 Hallstrom
- 2653 Principia
- 2704 Julian Loewe
- 2763 Jeans
- 2795 Lepage
- 2851 Harbin
- 2912 Lapalma
- 3849 Incidentia
- 3850 Peltier — Orbits within the Flora family region
- 3869 Norton
- 4188 Kitezh
- 4278 Harvey — Member of Baptistina family.
- 4434 Nikulin
- 4796 Lewis
- 4977 Rauthgundis
- 5379 Abehiroshi
V-type near-Earth asteroids
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See also
[edit]References
[edit]- ↑ S. J. Bus & R. P. Binzel (2002). "Phase II of the Small Main-belt Asteroid Spectroscopy Survey: A feature-based taxonomy". Icarus. 158 (1): 146. Bibcode:2002Icar..158..146B. doi:10.1006/icar.2002.6856. S2CID 4880578.
- ↑ R. P. Binzel & S. Xu (1993). "Chips off of asteroid 4 Vesta: Evidence for the parent body of basaltic achondrite meteorites". Science. 260 (5105): 186–91. Bibcode:1993Sci...260..186B. doi:10.1126/science.260.5105.186. PMID 17807177.
External links
[edit]- NEOWISE Diameters and Albedos - NASA Planetary Data System
- MIT Small Main-Belt Asteroid Spectroscopic Survey
- JPL Small-Body Database Browser