Definitions for absolute magnitude
ab·so·lute mag·ni·tude

Princeton's WordNetRate this definition:4.0 / 2 votes

1. absolute magnitudenoun

   (astronomy) the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth

WiktionaryRate this definition:0.0 / 0 votes

1. absolute magnitudenoun

   The intrinsic luminosity,x that a celestial body would have if viewed from a distance of 10 parsecs.

WikipediaRate this definition:0.0 / 0 votes

1. 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.

ChatGPTRate this definition:0.0 / 0 votes

1. absolute magnitude

   Absolute magnitude is a measure of the intrinsic brightness of a celestial object, such as a star, galaxy, or planet. It is the apparent magnitude the object would have if it were viewed from a standard distance of 10 parsecs or approximately 32.6 light-years away, assuming no light is absorbed or scattered between the object and the observer. This measure allows astronomers to compare the relative luminosities of celestial objects. It differs from apparent magnitude, which is the brightness of an object as observed from Earth.

WikidataRate this definition:0.0 / 0 votes

1. Absolute magnitude

   Absolute magnitude is the measure of a celestial object's intrinsic brightness. It is the apparent magnitude an object would have if it were at a standard luminosity distance away from the observer, in the absence of astronomical extinction. It allows the true brightnesses of objects to be compared without regard to distance. Bolometric magnitude is luminosity expressed in magnitude units; it takes into account energy radiated at all wavelengths, whether observed or not. The absolute magnitude uses the same convention as the visual magnitude: a factor of 100.4 ratio of brightness corresponds to a difference of 1.0 in magnitude. The Milky Way, for example, has an absolute magnitude of about −20.5. So a quasar at an absolute magnitude of −25.5 is 100 times brighter than our galaxy. If this particular quasar and our galaxy could be seen side by side at the same distance, the quasar would be 5 magnitudes brighter than our galaxy.

Matched Categories

1. • Astronomy
   • Magnitude

How to pronounce absolute magnitude?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say absolute magnitude in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of absolute magnitude in Chaldean Numerology is: 1

2. Pythagorean Numerology

   The numerical value of absolute magnitude in Pythagorean Numerology is: 9

Examples of absolute magnitude in a Sentence

1. Sam Deen:

   Based on the given absolute magnitude, and given how exceptionally red it looked in 2014 precovery images from CFHT (the g - r color was 0.9, and r - i was 0.5!) I would estimate at an albedo of 0.01-0.08 a diameter of 130-370 kilometers (nominally 160) which puts it on a similar scale, if not larger than, Sarabat's huge comet C/1729 P1, and almost undoubtedly the largest Oort Cloud object ever discovered- almost in dwarf planet territory! i have little doubt in my mind that as this gets closer to the sun, it will begin displaying the coma and tail typical of every other object yet seen in its orbit.

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=absolute magnitude
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Absolute_Magnitude
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Absolute_Magnitude
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=absolute magnitude