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Comets and Asteroids

SNC1D0 - ISU january 2013

farrah mehmood

on 11 January 2013

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Transcript of Comets and Asteroids

By Ramlah, Katerina & Farrah Comets and Asteroids What is an asteroid? What is a comet? A chunk of ice and dust that travels a very long orbit around the sun. Range in size Originate from spherical cloud of debris farther away than Pluto and takes more than 200 years to travel around the sun outer surface of a comet begins to sublimate (change state from solid to gas) when it gets closer to the sun and the icy nucleus heats up gaseous tail forms when the comet approaches the sun a small celestial object within the solar system composed of rock and metal orbit the sun but too small to be considered a planet Found in the asteroid belt located in the solar system between the orbit of Mars and Jupiter Vary in size, Can have a diameter of up to 950 km Mostly irregularly shaped. larger ones are often round take years to almost travel around the sun less than 100 km - more than 40km Most comets are named after their discoveries Long period comet: Short period comets: Originate from region just beyond orbit of Neptune and takes less than 200 years to orbit the sun gases and dusts escape when this occurs gases and dust form a cloud around the nucleus called a coma which can be thousands of km wide radiation and solar wind exert a force on the coma dust tail forms in direction from which the radiation and solar wind is exerting the force Comets can be pulled in by planets' gravity if it gets too close Comet - shoemaker - crashed into Jupiter July 1994 satellites that survey the sun have captured comets falling into the sun Famous comets Ceres
Chiron Recent discoveries on Asteroids there is a large asteroid belt around the star "vega"
it has an inner warm belt and outer cool belt seperated by a gap.
planets are maintaining the gap

it is just like the asteroid belt between mars and Jupiter.
Jupiter is maintained by the gravity if terrestrial planets and gas giant planets Asteroid 4176 recently tumbled past earth on December 12 2012 Recent discoveries about comets New mineral found in comets
manganese silicide named brownleeite

Disvcovered within an interplanetary dust particle

material was surrounded by many other minerals that also have been reported only in extraterrestrial rocks Famous Asteroids 1904 - Borelli
1847 - D'arrest
1786 - Encke
1900 - Giacoboni
- Zinner
- Halley
1966 - Hyakutake
1965 - shoemaker-Levx 9
1862 - Swift Tuttle
1867 - Temple 1
1873 -Temple 2
1978 - wild 2 Unique facts about comets Comets were perceived as " long-haired" stars Each comet has a tiny frozen part called nucleus. They are no bigger than a few km across Comets have two tails A dust tail, and a plasma (ionized gas) tail *NASA's stardust mission successfully flew within the nucleus of comet wild 2 collecting cometary particles and interstellar dust for a sample in 2006* Tails can be spotted from earth if it is close enough Properties of an asteroid Physical: • Appear bright ( depending on size and distance) •Come in different sizes and composition • Irregular shape ( because of their low density ) •Shiny •Airless •Rocky •minus 100 degrees F (minus 73 degrees C ) average temperature•greyish•stay unchanged for billions of years Properties of an asteroid Chemical: •rock
•metal Properties of a comet Physical: •Icy •Dust •Nucleus might have a small rocky core.
•Low density •Low temperature Properties of a comet Chemical: •Composed of gases such as carbon monoxide and dioxide, methane and ammonia. •organic compounds •2009, it was confirmed that the amino acid glycine had been found in the comet dust recovered by NASA's Stardust mission. •freezing point 32 °C •Has ions
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