Meteorites and Their Parent Planets

Meteoroid - orbiting object in space
Meteor - object passing through atmosphere
Meteorite - recovered fragment
Chondrite - 86%, silicate and oxide minerals, looser sediment
Achondrite - 8%, igneous rock, partial melting and crystalization
Iron - 5%, nickle-iron
Stony Iron - 1%, mixed iron and rock
Willamette Stone - 12700 kg iron
maximum 72 km/s retrograde, typically 10 to 30 km/s prograde
p22 fig 1.13: meteors carried through blue ice to ablate in katabatic winds in front of mountains, a few thousands to a million years later
Amor outside Earth's radius, or overlap Apollo > 1 year Aten < 1 year
p43 Rubidium to strontium isotope ratios yield age
p48 Element ratios the same as the Sun, though less gasses and more lithium

-p79 1959 Pribam near Prague tracked by several cameras intended for satellite tracking
1964-1974 Smithsonian's Prarie Network, 16 cameras in 500 km radius of SE Nebraska
- tracked hundreds, recovered "Lost City" in Oklahoma
Canadian network recovered "Innisfree" in Alberta
Asteroid types: S - chondrites, C - carbonaceous, D, P - dark
p120 ultramafic, like earth mantle basalt, olivine and pyroxene, rich in Mg and Fe
p192 iron phase diagram. Kamacite lower temperature BCC crystal, Taenite higher temperature (or more nickel) FCC crystal
- Widmanstätten patterns from crystal growth
p243 Fig 8.6, spall ejecta from planets Jay Melosh