Minor bodies observation from Earth and space: asteroid (2867)Steins
Minor bodies
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Transcript of Minor bodies
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Comets, Meteors, and Asteroids
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Structure of a Comet
To Sun
Ion Tail
Dust Tail
Coma
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Comet Structure
Nucleus10 km “Dirty Snowball”
ComaCloud of evaporated ices and ionsmay be 100,000 km in diameter
TailAlways points away from Sun
Solar Wind and Radiation Pressure
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The Oort Cloud
In 1950 Jan Oort noticed that no comet has been observed with an orbit that
indicates that it came from interstellar space,
there is a strong tendency for aphelia of long period comet orbits to lie at a distance of about 50,000 AU, and
there is no preferential direction from which comets come.
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The Oort Cloud
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Comet Halley
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Bayeaux TapestryNorman Invasion of 1066
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Comet Halley 1910
•Pope Callixtus III excommunicated Halley's Comet in 1456
•In 1910, charlatans sold "comet pills"
Orbit
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Comet Nucleus
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Comet of 1577
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Hyakutake
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Hale-Bopp
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Comet West
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The Cause of Meteor Showers
P55/Tempel-Tuttle
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Why After Midnight is Best
Rotational Velocity
Orbital Velocity
Midnight
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Shower Radiant
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The 1833 storm
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The 1966 storm
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1997 Leonids from Orbit
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Two Showers for Halley
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Sporadic Meteors
Irons Stony-Irons
Chondrites Carbonaceous Chondrite
Achondrite
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Barringer’s Crater
An iron meteorite 100 feet across and 70,000 tons slamed into the Earth at about 43,000mph in the Arizona desert near Flagstaff 40,000 years ago. Barringer Crater is 4,100 feet wide and 571 feet
deep.
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Other Impact Craters
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Tunguska, 1908
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How Much Damage?
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Asteroids
Apollo
Trojans
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Ida - Dactyl
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Gaspra
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Kirkwood Gaps
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Asteroids Elsewhere
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Sedna
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End of Section