Rosetta flyby of Asteroid Steins, 5th September 2008 |
Rosetta flyby of Asteroid Steins, 5th September 2008 |
Jun 19 2008, 06:53 AM
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#1
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Member Group: Members Posts: 568 Joined: 20-April 05 From: Silesia Member No.: 299 |
Only 78 days to Stein encounter ! I can't believe I forgot about this event.
-------------------- Free software for planetary science (including Cassini Image Viewer).
http://members.tripod.com/petermasek/marinerall.html |
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Jun 29 2008, 10:15 AM
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#2
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Newbie Group: Members Posts: 3 Joined: 28-June 08 Member No.: 4245 |
Around 15% or even more of the NEAs are suspected to be binary. Up to now more than 30 are confirmed out of 5000+ NEAs and most of them are less than 1500m in diameter. It seems the smaller the asteroid the better the chance it is a double.
The YORP effect is maybe the main forming mechanism of binary NEAs as most of them are very tiny. Other more uncommon forming mechanisms are collisions and tidal disruptions due to planetary close-encounter. |
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