Measurement of radiant electromagnetic power emitted by an object
For other uses, see Luminosity (disambiguation).
The Sun has an intrinsic luminosity of 3.83×1026 watts. In astronomy, this amount is equal to one solar luminosity, represented by the symbol L⊙. A star with four times the radiative power of the Sun has a luminosity of 4 L⊙.
Luminosity is an absolute measure of radiated electromagnetic energy (light) per unit time, and is synonymous with the radiant power emitted by a light-emitting object.[1][2] In astronomy, luminosity is the total amount of electromagnetic energy emitted per unit of time by a star, galaxy, or other astronomical objects.[3][4]
In SI units, luminosity is measured in joules per second, or watts. In astronomy, values for luminosity are often given in the terms of the luminosity of the Sun, L⊙. Luminosity can also be given in terms of the astronomical magnitude system: the absolute bolometric magnitude (Mbol) of an object is a logarithmic measure of its total energy emission rate, while absolute magnitude is a logarithmic measure of the luminosity within some specific wavelength range or filter band.
In contrast, the term brightness in astronomy is generally used to refer to an object's apparent brightness: that is, how bright an object appears to an observer. Apparent brightness depends on both the luminosity of the object and the distance between the object and observer, and also on any absorption of light along the path from object to observer. Apparent magnitude is a logarithmic measure of apparent brightness. The distance determined by luminosity measures can be somewhat ambiguous, and is thus sometimes called the luminosity distance.
^"Luminosity | astronomy". Encyclopedia Britannica. Retrieved 24 June 2018.
^"* Luminosity (Astronomy) - Definition, meaning - Online Encyclopedia". en.mimi.hu. Retrieved 24 June 2018.
^Hopkins, Jeanne (1980). Glossary of Astronomy and Astrophysics (2nd ed.). The University of Chicago Press. ISBN 978-0-226-35171-1.
^Morison, Ian (2013). Introduction to Astronomy and Cosmology. Wiley. p. 193. ISBN 978-1-118-68152-7.
units, luminosity is measured in joules per second, or watts. In astronomy, values for luminosity are often given in the terms of the luminosity of the...
solar luminosity (L☉) is a unit of radiant flux (power emitted in the form of photons) conventionally used by astronomers to measure the luminosity of stars...
The Eddington luminosity, also referred to as the Eddington limit, is the maximum luminosity a body (such as a star) can achieve when there is balance...
object's apparent distance and luminosity distance. Another way to express the luminosity distance is through the flux-luminosity relationship, F = L 4 π D...
Martinelli joined Luminosity on September 11. On September 12, 2019, Luminosity dropped its second Brazilian roster. On January 11, 2015, Luminosity picked up...
is the luminosity function, dimensionless; λ is the wavelength, in nanometres. Formally, the integral is the inner product of the luminosity function...
Luminosity Movement, (Turkish: Aydınlık çevresi), is the name of the group that published the Turkish Left and Socialist Luminosity magazines after the...
very large distances (outside the Milky Way) the luminosity distance dL (distance defined using luminosity measurements) must be used instead of d, because...
times the solar luminosity. At metallicity Z=0.01 the luminosity is 1.34 times solar luminosity. At metallicity Z=0.04 the luminosity is 0.89 times the...
the definition of spectral luminosity classes, with class I referring to supergiant stars. The same system of MK luminosity classes is still used today...
older Harvard spectral classification, which did not include luminosity) and a luminosity class using Roman numerals as explained below, forming the star's...
investigations on bright nebulae. One part of this work is the Hubble luminosity law for reflection nebulae, which makes a relationship between the angular...
as will the star's temperature and luminosity. The Sun, for example, is estimated to have increased in luminosity by about 40% since it reached the main...
Tibetan do not mention luminosity (pabhaṃ) and even the various Pali editions do not agree that this verse mentions luminosity, sometimes using pahaṃ...
radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature. They lie above the main sequence (luminosity class V in the...
photoelectric photometer allowed astronomers to accurately measure the color and luminosity of stars, which allowed them to predict their temperature and mass. In...
930 °F), resulting in a 48% increase in luminosity from 0.677 solar luminosities to its present-day 1.0 solar luminosity. This occurs because the helium atoms...
processing, thereby reducing costs compared to competitive approaches. The Luminosity Lab is a student-led research and development think tank located on the...
upgrades was to implement the High Luminosity Large Hadron Collider (HL-LHC) project that will increase the luminosity by a factor of 10. LS2 ended in April...
observer on Earth. An object's apparent magnitude depends on its intrinsic luminosity, its distance, and any extinction of the object's light caused by interstellar...
in disturbed water. At least 18 genera of these phytoplankton exhibit luminosity. Luminescent dinoflagellate ecosystems are present in warm water lagoons...
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