ASTR 3 Lecture Notes - Lecture 11: Orbital Speed, Orbital Period

55 views1 pages
16 Jan 2019
School
Department
Course
Professor

Document Summary

Contrast: a sun-like star is about a billion times brighter than the light reflected from its planets. Angular separation: planets are very close to their stars, relative to the distance from us to the star. There are two basic techniques used to search for extrasolar planets: Direct: pictures or spectra of the planets themselves. Two indirect methods are the astrometric and doppler techniques. For the solar system, the center of mass is just outside the surface of the sun. The sun"s motion around the solar system"s center of mass depends on gravitational tugs from all the planets. Easier way to use the gravitational tug of a planet on the star it is orbiting is through the doppler effect. The star moves alternaely slightly toward and away from us as part of its tiny orbital motions. So the star"s spectral lines will shift alternately to the blue and towards the red.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related Documents