ASTA01 @ UTSC – Lecture 13. Chapter 12 The Origin of the Solar System Asteroids Comets Meteors and meteoroids The story of planet formation: ages. Comets.
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bright comet is
(mV= -14m !)
The nucleus remains frozen and inactive while it is far from the Sun.
Comet Hale-Bopp in 1995
3 different terms:
A 60 m body hit over Siberia and disintegrated 7-8 km above almost unpopulated Taiga forest on June 30, 1908. No meteorite found on the ground near river Podkamennaya Tunguska
prof. L. Kulik's 1927 expedition photo
Tunguska catastrophe – originally thought due to a small comet, however, both comets & asteroids can provide the required energy: 1986
Tunguska event was caused by a smaller asteroid of a type similar to a stony asteroid Itokawa
60 m (Tunguska asteroid)
500 x 300 x 250 m (Itokawa)
ZL1 passed relatively close, but not
dangerously close to Earth