Near Earth Objects
Finding Them Before They Find Us
Donald K. Yeomans 2013 Princeton 523.44 Yeo Tigard
Manager of NASA's Near-Earth Object Program Office at JPL. He was the Radio Science Team Chief for the Near-Earth Asteroid Rendezvous (NEAR) mission and currently he is the US Project Scientist for the Japanese Hayabusa.
- xiii 2013 Feb 15 Asteroid 2012 DA L-class, carbon dominated with calcium and aluminum inclusions, .44 albedo, 20x40m
- xiii 2013 Feb 15 Chelyabinsk fireball 23 km altitude 18m diameter 10000 tonnes
- xiii 1km asteroid every 500K years
p11 Amor: per 1.017 to 1.3 AU, ap < Mars ~ 1.5 AU
Apollo: per < 1.017 AU, semi > 1 AU
Aten: ap > 0.983 AU, semi < 1 AU
Atiras: ap < 0.983 AU, semi < 1 AU
p19 Neptune 30 AU, Kuiper 35AU to 50 AU (<0.1 Me), Oort >1K to 100K AU (1.6 LY) (4 to 80 Me)
- p33 Nice model of planetary formation/migration
- p44 Yarkowski, prograde rotation outward
- p45 YORP, uneven radiation changes rotation