ES+2232F_Asteroids

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Western University *

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2232

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Astronomy

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Oct 30, 2023

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35

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ES 2232F: Exploring the Planets An Introduction to Planetary Science Lecture: Asteroids
ES 2232F - Exploring the Planets Eros The Nebular Theory v Accretion: v The process of growing by colliding and sticking. v The Planetesimals Hypothesis: v Planetesimals = “Pieces of Planets”. v Growing objects formed by accretion. v Planetesimal > 1km v attract each other growing v Protoplanets = v > moon-sized planetesimals.
ES 2232F - Exploring the Planets Asteroids Solid, rocky bodies that orbit the Sun: – Irregularly shaped to spherical – Sizerange ~1 km to 950 km – Often pitted or cratered Left over remnants from formation of Solar System More than ½million known – Probably many more unknown (NASA/JPL-Caltech/UCLA/MPS/DLR/IDA) (NASA/JPL/JHUAPL) Vesta Eros
ES 2232F - Exploring the Planets Asteroids Eros Credits: Michel et al. (2011) MarcoPolo-R near earth asteroid sample return mission
Asteroids with moons? Asteroid-moon systems – Over 150 have satellites – Ida wasthe first discovered – Somehave two Binary asteroid systems – Twobodies of equal size orbit each other – Also triple asteroid systems Ida Dactyl ES 2232F - Exploring the Planets
Asteroids with moons? Ida Dactyl ES 2232F - Exploring the Planets Learn more about the DART mission: https://dart.jhuapl.edu/ Credits: Smallstars 2020 / DART Space X NASA ( https://youtu.be/bFI--8sP0OEb) DART Impact 2022 NASA ( https://youtu.be/N-OvnVdZP_8 )
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