GSU ASTR 1010 - Comets, Asteroids, and Meteors (2 pages)

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Comets, Asteroids, and Meteors



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Comets, Asteroids, and Meteors

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Comets, Asteroids, and Meteors are discussed


Lecture number:
22
Pages:
2
Type:
Lecture Note
School:
Georgia State University
Course:
Astr 1010 - Astronomy of the Solar System
Edition:
1

Unformatted text preview:

ASTR 1010 1st Edition Lecture 22 Outline of Last Lecture I Saturn A Atmosphere B Properties C Magnetic Properties D Internal Structure E Satellites II Uranus III Neptune IV Pluto Outline of Current Lecture I Comets II Asteroids III Meteors Current Lecture I Comets 1 Nucleus Diameter 1 10 km Mass 0 1 0 01 Mass of Moon Composition Probably aggregates of ice and stones 2 Coma Head First visible at approx 5 AU Composition Gas and dust Size Approx the diameter of Earth Sun 3 Tail First Approx 2 AU Grows in length as it approaches the sun L 1 AU Always points away from the sun due to solar wind components Ion tail straight II III Dust tail curved 4 Orbits Random 50 Retrograde 50 Direct All inclinations Short period comets Assoc with Jupiter or Saturn Halley s Comet 76 year period 5 Origin Kuiper Belt Oort Cloud Asteroids 1 Size Ceres 780 km Pallas 490 km Juno 200 km Vesta 390 km 2 Orbits Most lie between Mars and Jupiter Kirkwood Division Trojan Asteroids Apollo Asteroids Distance 1 AU Icarus 1 08 AU Eros 1 4 AU 14 000 000 MI Amor Asteroids Cross Mars orbit Meteors 1 Types Sporadic asteroid origin Showers cometary debris Geminids Perseids 2 Nomenclature a Meteor visible phenomenon in the atmosphere b Meteoroid physical object in space c Meteorite object that is recoverable on Earth d Bolide meteor that produces a noise e Fireball unusually bright meteor 3 Composition Iron 8 of total 75 that are recovered Stone 35 of total Less than 10 recovered Stony Iron same as stones Tektites black glossy objects Moondrops



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