P/2006 VW139: a main-belt comet born in an asteroid collision?
Article first published online: 3 JUL 2012
© 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Monthly Notices of the Royal Astronomical Society
Volume 424, Issue 2, pages 1432–1441, August 2012
How to Cite
Novaković, B., Hsieh, H. H. and Cellino, A. (2012), P/2006 VW139: a main-belt comet born in an asteroid collision?. Monthly Notices of the Royal Astronomical Society, 424: 1432–1441. doi: 10.1111/j.1365-2966.2012.21329.x
- Issue published online: 13 JUL 2012
- Article first published online: 3 JUL 2012
- Accepted 2012 May 16. Received 2012 April 29; in original form 2012 March 21
- comets: general;
- comets: individual: P/2006 VW139;
- minor planets, asteroids: general;
- minor planets, asteroids: individual: 300163
In this paper, we apply different methods to examine the possibility that a small group of 24 asteroids dynamically linked to a main-belt comet P/2006 VW139, recently discovered by the Pan-STARRS1 survey telescope, shares a common physical origin. By applying the hierarchical clustering and backward integration methods, we find strong evidence that 11 of these asteroids form a sub-group which likely originated in a recent collision event, and that this group includes P/2006 VW139. The objects not found to be part of the 11-member sub-group, which we designate as the P/2006 VW139 family, were either found to be dynamically unstable or are likely interlopers which should be expected due to the close proximity of the Themis family. As we demonstrated, statistical significance of the P/2006 VW139 family is >99 per cent. We determine the age of the family to be 7.5 ± 0.3 Myr, and estimate the diameter of the parent body to be ∼11 km. Results show that the family is produced by an impact which can be best characterized as a transition from the catastrophic to the cratering regime. The dynamical environment of this family is studied as well, including the identification of the most influential mean motion and secular resonances in the region. Our findings now make P/2006 VW139 the second main-belt comet to be dynamically associated with a young asteroid family, a fact with important implications for the origin and activation mechanism of such objects.