proper motion concept from the Astronomy knowledge base

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proper motion

subject fact

proper motion has definition Apparent angular rate of motion of a star across the line of sight on the celestial sphere. has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:29:52.0
has definition The apparent movement of a star, year after year, caused by the star's velocity across the line of sight. If the star's distance is known, this velocity-called the tangential velocity, can be computed. The star with the largest proper motion is Barnard's Star, whose proper motion is 10.3 arc-seconds per year. has source: Croswell, K. 1995 The Alchemy of the Heavens, Anchor Books, 2001-09-27 09:29:52.0
has definition The projection onto the celestial sphere of the space motion of a star relative to the solar system; thus the transverse component of the space motion of a star with respect to the solar system. Proper motion is usually tabulated in star catalogs as changes in right ascension and declination per year or century. has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:29:52.0
is a kind of motion

physical process has domain physics 2001-09-27 09:29:38.0

Kinds of proper motion :

reduced proper motion (2 facts) - The observed proper motion of a star (in seconds of arc per year) reduced to absolute proper motion (in kilometers per second).

proper motion	has definition Apparent angular rate of motion of a star across the line of sight on the celestial sphere.
	has definition The apparent movement of a star, year after year, caused by the star's velocity across the line of sight. If the star's distance is known, this velocity-called the tangential velocity, can be computed. The star with the largest proper motion is Barnard's Star, whose proper motion is 10.3 arc-seconds per year.
	has definition The projection onto the celestial sphere of the space motion of a star relative to the solar system; thus the transverse component of the space motion of a star with respect to the solar system. Proper motion is usually tabulated in star catalogs as changes in right ascension and declination per year or century.
	is a kind of motion
physical process	has domain physics