Origin of asteroid rotation rates in catastrophic impacts

Details Origin of asteroid rotation rates in catastrophic impacts Origin of asteroid rotation rates in catastrophic impacts

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997natur.386..154l&link_type=abstract

Nature, Volume 386, Issue 6621, pp. 154-156 (1997).

Astronomy and Astrophysics

Astrophysics

15

Scientific paper

The rotation rates of asteroids, which are deduced from periodic fluctuations in their brightnesses1, are controlled by mutual collisions2-8. The link between asteroid spin and collision history is usually made with reference to impact experiments on centimetre-scale targets, where material strength governs the impact response2,3,9-11. Recent work, however, indicates that for objects of the size of most observed asteroids (>=1 km in diameter), gravity rather than intrinsic strength controls the dynamic response to collisions12-14. Here we explore this idea by modelling the effect of impacts on large gravitating bodies. We find that the fraction of a projectile's angular momentum that is retained by a target asteroid is both lower and more variable than expected from laboratory experiments, with spin evolution being dominated by 'catastrophic' collisions that eject ~50 per cent of the target's mass. The remnant of an initially non-rotating silicate asteroid that suffers such a collision rotates at a rate of ~2.9 per day, which is close to the observed mean asteroid rotation rate of ~2.5 d-1. Moreover, our calculations suggest that the observed trend in the mean spin frequency for different classes of asteroids4 (2.2 d-1for C-type asteroids, 2.5 d-1 for S-type, and 4.0 d-1 for M-type) is due to increasing mean density, rather than increasing material strength.

Affiliated with

Also associated with

No associations

Rating

Origin of asteroid rotation rates in catastrophic impacts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Origin of asteroid rotation rates in catastrophic impacts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Origin of asteroid rotation rates in catastrophic impacts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-875460