Two-colour diagrams
type: Concept
preferred label: Two-color diagrams
broader: Apparent magnitude

Photoelectric magnitude
type: Concept
broader: Apparent magnitude

Photovisual magnitude
type: Concept
broader: Apparent magnitude

Period determination
type: Concept
broader: Apparent magnitude

Pogson scale
type: Concept
broader: Apparent magnitude

Limiting magnitude
type: Concept
broader: Apparent magnitude

Variable star period change
type: Concept
broader: Apparent magnitude

Photographic magnitude
type: Concept
broader: Apparent magnitude

Magnitude
type: Concept
narrower: Apparent magnitude

Apparent magnitude
type: Concept
alternative label: Visual magnitude
narrower: Photovisual magnitude
narrower: Two-colour diagrams
narrower: Photoelectric magnitude
narrower: Photographic magnitude
narrower: Period determination
narrower: Variable star period change
narrower: Limiting magnitude
narrower: Pogson scale
modified: 2020-11-03T18:09:53.877Z
modified: 2020-11-03T18:09:41.442Z
definition: A measure of a star's observed brightness (opposed to absolute magnitude); symbol m. It depends on the star's intrinsic brightness, its distance from the observer, and the amount of interstellar absorption. The brightest star Sirius has an apparent magnitude of -1.46, while the weakest stars visible with the naked eye in the most favorable observation conditions have magnitudes of about +6.5. The stars of magnitudes less than +23 are measured by professional observatories, whereas those of magnitudes less than +30 by a telescope such as the Hubble Space Telescope.
broader: Magnitude
contributor: AAS Frey.Katie