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2. Magnitude (astronomy) - Wikipedia

   en.wikipedia.org/wiki/Magnitude_(astronomy)

   An illustration of light sources from magnitude 1 to 3.5, in 0.5 increments. In astronomy, magnitude is a measure of the brightness of an object, usually in a defined passband. An imprecise but systematic determination of the magnitude of objects was introduced in ancient times by Hipparchus. Magnitude values do not have a unit.

3. List of nearest stars - Wikipedia

   en.wikipedia.org/wiki/List_of_nearest_stars

   Many brown dwarfs are not listed by visual magnitude but are listed by near-infrared J band apparent magnitude due to how dim (and often invisible) they are in visible color bands (U, B or V). Absolute magnitude (with electromagnetic wave, 'light' band denoted in subscript) is a measurement at a 10-parsec distance across imaginary empty space ...

4. List of common astronomy symbols - Wikipedia

   en.wikipedia.org/wiki/List_of_common_astronomy...

   Download QR code; Print/export ... This is a compilation of symbols commonly used in astronomy, particularly professional astronomy. ... - Absolute magnitude, ...

5. Apparent magnitude - Wikipedia

   en.wikipedia.org/wiki/Apparent_magnitude

   The absolute magnitude M, of a star or astronomical object is defined as the apparent magnitude it would have as seen from a distance of 10 parsecs (33 ly). The absolute magnitude of the Sun is 4.83 in the V band (visual), 4.68 in the Gaia satellite's G band (green) and 5.48 in the B band (blue).

6. Celestial cartography - Wikipedia

   en.wikipedia.org/wiki/Celestial_cartography

   Field Guide to the Stars and Planets – Jay M. Pasachoff, Wil Tirion charts (stars to magnitude 7.5) SkyGX (still in preparation) – Christopher Watson (stars to magnitude 12) The Great Atlas of the Sky – Piotr Brych (2,400,000 stars to magnitude 12, galaxies to magnitude 18).

7. Photographic magnitude - Wikipedia

   en.wikipedia.org/wiki/Photographic_magnitude

   Photographic magnitude (m ph or m p) is a measure of the relative brightness of a star or other astronomical object as imaged on a photographic film emulsion with a camera attached to a telescope. An object's apparent photographic magnitude depends on its intrinsic luminosity , its distance and any extinction of light by interstellar matter ...

8. Absolute magnitude - Wikipedia

   en.wikipedia.org/wiki/Absolute_magnitude

   As with all astronomical magnitudes, the absolute magnitude can be specified for different wavelength ranges corresponding to specified filter bands or passbands; for stars a commonly quoted absolute magnitude is the absolute visual magnitude, which uses the visual (V) band of the spectrum (in the UBV photometric system).

9. List of brightest stars - Wikipedia

   en.wikipedia.org/wiki/List_of_brightest_stars

   For example, Betelgeuse has the K-band apparent magnitude of −4.05. [5] Some stars, like Betelgeuse and Antares, are variable stars, changing their magnitude over days, months or years. In the table, the range of variation is indicated with the symbol "var". Single magnitude values quoted for variable stars come from a variety of sources.