UGS 303 Lecture Notes - Lecture 3: Proper Motion, W. M. Keck Observatory
3 Sep 2015
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Document Summary
The basic properties of motion of a star are parallax (apparent motion), proper motion (actual motion), and radial velocity (doppler effect/shift) Discovered in 1916 due to its proper motion (10"" per year). Van de kamp collected tens of thousands of photographic plates for over 40 years. Suspected interference in motion due to orbiting planet. Parameters of a planet changed significantly over the years. The first believed detection of a planet was around a pulsar. Measured with very accurate time measurements; planet imparts a small pull on the pulsar which can be detected by a pulse signal. First pulsar planet presented in 1994, but retracted in 1995. First pulsar planet confirmed came from data in 1991, and confirmed in 1995. Today, there are a handful of confirmed pulsar planets. The first group to present results from a planet search around normal stars was the. Geneva group (mayor and company) in 1995; the star is called 51peg.
