Astronomy and astrophysics Spherical astronomy and astrometry Concept
Proper motion
Summary
The proper motion of a star is the rate at which its direction on the celestial sphere changes. The effects of the observer's motion are removed first. It is the angular part of the star's real motion through space, seen from the Sun. It is measured in arcseconds or milliarcseconds per year, and with the distance it gives the star's velocity across the line of sight.
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| Tag | K38DHGRW6D |
|---|---|
| URI | m2://K38DHGRW6D |
| Kind | concept |
| Writing | W0 stub |
| MSC | 85A04 |
| Same as | |
| Changed | 3 November 2026 |
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