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
- p50 Moon formed 4.5Gya / Late Heavy Bombardment 3.9 Gya / life evidence 3.5 Gya / Oxygen 2.4 Gya / Eukariotes 2.0 Gya
- p56 few known NEO until mid 1990s
- p63 Eleanor "Glo" Helin 1932-2009 with Gene Shoemaker at Palomar Schmidt 1973
- p65 Gene and Carolyn Shoemaker to USGS Flagstaff, Helin to JPL
p65 1983 Tom Gehrels and Bob McMillan, Spacewatch at Steward Obsv. near Tucson, 1989 2K*2K CCD
- p69 1998 Spaceguard Goal, 90% of 1-2km NEO over next decad, presumed 14% albedo
p73 NEA discovery graph book as of 2011/08
p75 LSST expected to find 90% of >140m objects over 70 years
p76 WISE 2009/12 to 2010/10, NEOWISE Amy Mainzer discovered 135 NEOs and 21 comets
- p77 hypothetical NEO IR telescope at Venus distance could see more Aten class