Astronomy and astrophysics Spherical astronomy and astrometry Concept
Apparent magnitude
Summary
The apparent magnitude of a celestial object measures how bright it looks from the Earth, on a reversed logarithmic scale. A difference of magnitudes is a factor of exactly in received flux, and brighter objects have smaller magnitudes. It is the basic photometric quantity of observational astronomy.
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| Tag | R8BRMEQ4DN |
|---|---|
| URI | m2://R8BRMEQ4DN |
| Kind | concept |
| Writing | W0 stub |
| MSC | 85A04 |
| Same as | |
| Changed | 3 November 2026 |
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