absolute magnitude - ορισμός. Τι είναι το absolute magnitude
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Τι (ποιος) είναι absolute magnitude - ορισμός

LOGARITHMIC MEASURE OF THE LUMINOSITY OF A CELESTIAL OBJECT
Bolometric magnitude; Absolute brightness; Absolute Visual Magnitude; Absolute Magnitude; Absolute bolometric magnitude; Intrinsic brightness; Absolute luminosity; Absolute visual magnitude; Absolute magnitude (H)
  • Phase integrals for various values of G
  • Dawn]] spacecraft at phase angles of 0°, 7° and 33°. The strong difference in brightness between the three is real. The left image at 0° phase angle shows the brightness surge due to the [[opposition effect]].
  • Brightness with phase for diffuse reflection models. The sphere is 2/3 as bright at zero phase, while the disk can't be seen beyond 90 degrees.
  • Diffuse reflection on sphere and flat disk
  • The phase angle <math>\alpha</math> can be calculated from the distances body-sun, observer-sun and observer-body, using the [[law of cosines]].
  • Relation between the slope parameter <math>G</math> and the opposition surge. Larger values of <math>G</math> correspond to a less pronounced opposition effect. For most asteroids, a value of <math>G = 0.15</math> is assumed, corresponding to an opposition surge of <math>0.3\text{ mag}</math>.

absolute magnitude         
¦ noun Astronomy the magnitude (brightness) of a celestial object as it would be seen at a standard distance of 10 parsecs.
Absolute magnitude         
Absolute magnitude () is a measure of the luminosity of a celestial object on an inverse logarithmic astronomical magnitude scale. An object's absolute magnitude is defined to be equal to the apparent magnitude that the object would have if it were viewed from a distance of exactly , without extinction (or dimming) of its light due to absorption by interstellar matter and cosmic dust.
Absolute Magnitude (magazine)         
SCIENCE FICTION MAGAZINE
Absolute magnitude (magazine)
Absolute Magnitude is an American discontinued, semi-professional science fiction magazine started in Spring/Summer 1993 issue under the name Harsh Mistress. However, in 1994 after only two issues the name was changed to Absolute Magnitude.

Βικιπαίδεια

Absolute magnitude

Absolute magnitude (M) is a measure of the luminosity of a celestial object on an inverse logarithmic astronomical magnitude scale. An object's absolute magnitude is defined to be equal to the apparent magnitude that the object would have if it were viewed from a distance of exactly 10 parsecs (32.6 light-years), without extinction (or dimming) of its light due to absorption by interstellar matter and cosmic dust. By hypothetically placing all objects at a standard reference distance from the observer, their luminosities can be directly compared among each other on a magnitude scale.

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). Absolute magnitudes are denoted by a capital M, with a subscript representing the filter band used for measurement, such as MV for absolute magnitude in the V band.

The more luminous an object, the smaller the numerical value of its absolute magnitude. A difference of 5 magnitudes between the absolute magnitudes of two objects corresponds to a ratio of 100 in their luminosities, and a difference of n magnitudes in absolute magnitude corresponds to a luminosity ratio of 100n/5. For example, a star of absolute magnitude MV = 3.0 would be 100 times as luminous as a star of absolute magnitude MV = 8.0 as measured in the V filter band. The Sun has absolute magnitude MV = +4.83. Highly luminous objects can have negative absolute magnitudes: for example, the Milky Way galaxy has an absolute B magnitude of about −20.8.

An object's absolute bolometric magnitude (Mbol) represents its total luminosity over all wavelengths, rather than in a single filter band, as expressed on a logarithmic magnitude scale. To convert from an absolute magnitude in a specific filter band to absolute bolometric magnitude, a bolometric correction (BC) is applied.

For Solar System bodies that shine in reflected light, a different definition of absolute magnitude (H) is used, based on a standard reference distance of one astronomical unit.