Astronomy 1021 Lecture 21: Comets, Meteors, + More! (November 29, 2016 - Astronomy) *Lots of Graphics*
29 Nov 2016
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Document Summary
Constellation of the week: lynx: zigzag line named after the animal, six star systems found to contain planets, ngc 2419 ngc 2770 apm 08279+5255, lynx supercluster. Asteroids have a number infront of them, moons do not. Most famous comet: halley"s co(cid:373)et, periodicity realized by edmund halley, 75 to 76-year period, seen since at least 240 bc (ancient chinese records, next observable: 2061, peri/aphelion: 0. 6 au - 35 au. Other recent comets: hale-bopp (1997, mcnaught (2007, holmes (2007-2008) Includes all wavelengths of electromagnetic radiation coming from the sun: solar wind. Electrons, protons, ions) released from upper atmosphere of sun. Comet components: nucleus: the dirty snowball (ice + rock, coma: vaporized gases around nucleus, plasma tail: (a. k. a. gas or ion tail) ionized gas (fro(cid:373) su(cid:374)"s uv) pushed directly outward by solar wind. 2: dust tail: left behind in comets wake, and pushed by radiation pressure (sunlight, coma and tails are only produced when comet gets closer to the sun and starts melting.
