comet neat. comets small icy objects that orbit the sun… 1-10 km nucleus of ice coated with dark...
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Comet NEAT
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Comets
Small icy objects that orbit the Sun… 1-10 km
Nucleus of ice coated with dark organic material (dirty snowball)
Short period comets (<200 yr orbit) are in Kuiper Belt
Long-period comets (>200 yrs) are in Oort Cloud
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Comets
Comet warms as it nears the sun.
Develops an atmosphere, or “coma”.
Coma gets blown by solar wind, forming tail.
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Comets
Halley’s Comet - every 76 years (1986 last).
Pictured in Bayeux Tapestry (1066)
Adoration of Magi painting (Bondone - 1303)
Chinese astronomers kept extensive records.
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Halley’s Comet
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Comet Hartley 2
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Tempel 1 (Deep Impact)
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Shoemaker-Levy 9
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Bradfield’s Plunge
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Oort Cloud
Between 5,000 to 100,000 AU (~1 ly) from the sun.
Oort Cloud comets can take 30 million yrs to orbit.
Long-period comets inhabit region.
Not only comets there.
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Sedna
From 76 AU to 960 AU (36x Neptune).
11,000 yr orbit.
Is it Kuiper Belt or first Inner Oort Cloud?
Will likely be confirmed as dwarf planet.
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