Logo
Unionpedia
Communication
Get it on Google Play
New! Download Unionpedia on your Android™ device!
Install
Faster access than browser!
 

Luminosity

+ Save concept

In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object. [1]

90 relations: AB magnitude, Absolute magnitude, Absorption (electromagnetic radiation), Angular diameter, Apparent magnitude, Astronomical object, Astronomical radio source, Astronomy, Astrophysical maser, Atmosphere of Earth, Australia Telescope National Facility, Bandwidth (signal processing), Beta Draconis, Betelgeuse, Black body, Bolometer, Bolometric correction, Cambridge University Press, Circumstellar dust, Deneb, Denebola, Earth, Effective temperature, Energy, Extinction (astronomy), Flux, Galaxy, HD 113766, HD 149382, HD 40307, Hertzsprung–Russell diagram, HIP 13044, Hipparchus, Institute for Advanced Study, International System of Units, Interstellar medium, Inverse-square law, Isotropy, Jansky, Joule, K band (infrared), K correction, Kelvin, Lambda Pegasi, List of brightest stars, List of most luminous stars, Logarithmic scale, Luminosity distance, Magnitude (astronomy), Main sequence, ..., Mass–luminosity relation, Milky Way, N. R. Pogson, Neutrino, O-type main-sequence star, Orders of magnitude (power), Parallax, Parsec, Passband, Photometric system, Photometry (astronomy), Pleione (star), Power (physics), R136a1, Radiant energy, Radius, Redshift, Rest frame, Solar luminosity, Spectral flux density, Spectral index, Sphere, Springer Science+Business Media, Star, Stefan–Boltzmann constant, Stefan–Boltzmann law, Stellar classification, Stellar parallax, Sun, Synonym, Telescope, Time, UBV photometric system, University of Chicago Press, Vega, Very-long-baseline interferometry, Watt, Wavelength, Wolf–Rayet star, 54 Piscium. Expand index (40 more) »

AB magnitude

The AB magnitude system is an astronomical magnitude system.

New!!: Luminosity and AB magnitude · See more »

Absolute magnitude

Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.

New!!: Luminosity and Absolute magnitude · See more »

Absorption (electromagnetic radiation)

In physics, absorption of electromagnetic radiation is the way in which the energy of a photon is taken up by matter, typically the electrons of an atom.

New!!: Luminosity and Absorption (electromagnetic radiation) · See more »

Angular diameter

The angular diameter, angular size, apparent diameter, or apparent size is an angular measurement describing how large a sphere or circle appears from a given point of view.

New!!: Luminosity and Angular diameter · See more »

Apparent magnitude

The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.

New!!: Luminosity and Apparent magnitude · See more »

Astronomical object

An astronomical object or celestial object is a naturally occurring physical entity, association, or structure that exists in the observable universe.

New!!: Luminosity and Astronomical object · See more »

Astronomical radio source

Astronomical radio sources are objects in outer space that emit strong radio waves.

New!!: Luminosity and Astronomical radio source · See more »

Astronomy

Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.

New!!: Luminosity and Astronomy · See more »

Astrophysical maser

An astrophysical maser is a naturally occurring source of stimulated spectral line emission, typically in the microwave portion of the electromagnetic spectrum.

New!!: Luminosity and Astrophysical maser · See more »

Atmosphere of Earth

The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity.

New!!: Luminosity and Atmosphere of Earth · See more »

Australia Telescope National Facility

The Commonwealth Scientific and Industrial Research Organisation (CSIRO)'s radio astronomy observatories are collectively known as the Australia Telescope National Facility (ATNF), with the facility supporting Australia's research in radio astronomy.

New!!: Luminosity and Australia Telescope National Facility · See more »

Bandwidth (signal processing)

Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies.

New!!: Luminosity and Bandwidth (signal processing) · See more »

Beta Draconis

Beta Draconis (β Draconis, abbreviated Beta Dra, β Dra) is a binary star and the third-brightest star in the northern circumpolar constellation of Draco.

New!!: Luminosity and Beta Draconis · See more »

Betelgeuse

Betelgeuse, also designated Alpha Orionis (α Orionis, abbreviated Alpha Ori, α Ori), is the ninth-brightest star in the night sky and second-brightest in the constellation of Orion.

New!!: Luminosity and Betelgeuse · See more »

Black body

A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.

New!!: Luminosity and Black body · See more »

Bolometer

A bolometer is a device for measuring the power of incident electromagnetic radiation via the heating of a material with a temperature-dependent electrical resistance.

New!!: Luminosity and Bolometer · See more »

Bolometric correction

In astronomy, the bolometric correction is the correction made to the absolute magnitude of an object in order to convert its visible magnitude to its bolometric magnitude.

New!!: Luminosity and Bolometric correction · See more »

Cambridge University Press

Cambridge University Press (CUP) is the publishing business of the University of Cambridge.

New!!: Luminosity and Cambridge University Press · See more »

Circumstellar dust

Circumstellar dust is cosmic dust around a star.

New!!: Luminosity and Circumstellar dust · See more »

Deneb

Deneb, also designated α Cygni (Latinised alpha Cygni, abbreviated Alpha Cyg, α Cyg), is the brightest star in the constellation of Cygnus.

New!!: Luminosity and Deneb · See more »

Denebola

Denebola, also designated Beta Leonis (β Leonis, abbreviated Beta Leo, β Leo) is the second-brightest star in the zodiac constellation of Leo, although the two components of the γ Leonis double star, which are unresolved to the naked eye, have a combined magnitude brighter than it.

New!!: Luminosity and Denebola · See more »

Earth

Earth is the third planet from the Sun and the only astronomical object known to harbor life.

New!!: Luminosity and Earth · See more »

Effective temperature

The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation.

New!!: Luminosity and Effective temperature · See more »

Energy

In physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object.

New!!: Luminosity and Energy · See more »

Extinction (astronomy)

In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.

New!!: Luminosity and Extinction (astronomy) · See more »

Flux

Flux describes the quantity which passes through a surface or substance.

New!!: Luminosity and Flux · See more »

Galaxy

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.

New!!: Luminosity and Galaxy · See more »

HD 113766

HD 113766 is a binary star system located 424 light years from Earth in the direction of the constellation Centaurus.

New!!: Luminosity and HD 113766 · See more »

HD 149382

HD 149382 is a star in the constellation of Ophiuchus with an apparent visual magnitude of 8.943.

New!!: Luminosity and HD 149382 · See more »

HD 40307

HD 40307 is an orange (K-type) main-sequence star located approximately 42 light-years away in the constellation of Pictor (the Easel), taking its primary name from its Henry Draper Catalogue designation.

New!!: Luminosity and HD 40307 · See more »

Hertzsprung–Russell diagram

The Hertzsprung–Russell diagram, abbreviated H–R diagram, HR diagram or HRD, is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

New!!: Luminosity and Hertzsprung–Russell diagram · See more »

HIP 13044

HIP 13044 is a red horizontal-branch star about 2,300 light years (700 pc) from Earth in the constellation Fornax.

New!!: Luminosity and HIP 13044 · See more »

Hipparchus

Hipparchus of Nicaea (Ἵππαρχος, Hipparkhos) was a Greek astronomer, geographer, and mathematician.

New!!: Luminosity and Hipparchus · See more »

Institute for Advanced Study

The Institute for Advanced Study (IAS) in Princeton, New Jersey, in the United States, is an independent, postdoctoral research center for theoretical research and intellectual inquiry founded in 1930 by American educator Abraham Flexner, together with philanthropists Louis Bamberger and Caroline Bamberger Fuld.

New!!: Luminosity and Institute for Advanced Study · See more »

International System of Units

The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.

New!!: Luminosity and International System of Units · See more »

Interstellar medium

In astronomy, the interstellar medium (ISM) is the matter and radiation that exists in the space between the star systems in a galaxy.

New!!: Luminosity and Interstellar medium · See more »

Inverse-square law

The inverse-square law, in physics, is any physical law stating that a specified physical quantity or intensity is inversely proportional to the square of the distance from the source of that physical quantity.

New!!: Luminosity and Inverse-square law · See more »

Isotropy

Isotropy is uniformity in all orientations; it is derived from the Greek isos (ἴσος, "equal") and tropos (τρόπος, "way").

New!!: Luminosity and Isotropy · See more »

Jansky

The jansky (symbol Jy) is a non-SI unit of spectral flux density, or spectral irradiance, used especially in radio astronomy.

New!!: Luminosity and Jansky · See more »

Joule

The joule (symbol: J) is a derived unit of energy in the International System of Units.

New!!: Luminosity and Joule · See more »

K band (infrared)

In infrared astronomy, the K band is an atmospheric transmission window centered on 2.2 μm (in the near-infrared 136 THz range).

New!!: Luminosity and K band (infrared) · See more »

K correction

K correction is a correction to an astronomical object's magnitude (or equivalently, its flux) that allows a measurement of a quantity of light from an object at a redshift z to be converted to an equivalent measurement in the rest frame of the object.

New!!: Luminosity and K correction · See more »

Kelvin

The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.

New!!: Luminosity and Kelvin · See more »

Lambda Pegasi

Lambda Pegasi (λ Peg, λ Pegasi) is a fourth-magnitude star in the constellation Pegasus.

New!!: Luminosity and Lambda Pegasi · See more »

List of brightest stars

This is a list of the brightest naked eye stars to +2.50 magnitude, as determined by their maximum, total, or combined apparent visual magnitudes as seen from Earth.

New!!: Luminosity and List of brightest stars · See more »

List of most luminous stars

Below is a list of stars arranged in order of decreasing luminosity (increasing bolometric magnitude).

New!!: Luminosity and List of most luminous stars · See more »

Logarithmic scale

A logarithmic scale is a nonlinear scale used when there is a large range of quantities.

New!!: Luminosity and Logarithmic scale · See more »

Luminosity distance

Luminosity distance DL is defined in terms of the relationship between the absolute magnitude M and apparent magnitude m of an astronomical object.

New!!: Luminosity and Luminosity distance · See more »

Magnitude (astronomy)

In astronomy, magnitude is a logarithmic measure of the brightness of an object in a defined passband, often in the visible or infrared spectrum, but sometimes across all wavelengths.

New!!: Luminosity and Magnitude (astronomy) · See more »

Main sequence

In astronomy, the main sequence is a continuous and distinctive band of stars that appear on plots of stellar color versus brightness.

New!!: Luminosity and Main sequence · See more »

Mass–luminosity relation

In astrophysics, the mass–luminosity relation is an equation giving the relationship between a star's mass and its luminosity, first noted by Jakob Karl Ernst Halm.

New!!: Luminosity and Mass–luminosity relation · See more »

Milky Way

The Milky Way is the galaxy that contains our Solar System.

New!!: Luminosity and Milky Way · See more »

N. R. Pogson

Norman Robert Pogson, CIE (23 March 1829 – 23 June 1891) was an English astronomer who worked in India at the Madras observatory.

New!!: Luminosity and N. R. Pogson · See more »

Neutrino

A neutrino (denoted by the Greek letter ν) is a fermion (an elementary particle with half-integer spin) that interacts only via the weak subatomic force and gravity.

New!!: Luminosity and Neutrino · See more »

O-type main-sequence star

An O-type main-sequence star (O V) is a main-sequence (core hydrogen-burning) star of spectral type O and luminosity class V. These stars have between 15 and 90 times the mass of the Sun and surface temperatures between 30,000 and 50,000 K. They are between 40,000 and 1,000,000 times as luminous as the Sun.

New!!: Luminosity and O-type main-sequence star · See more »

Orders of magnitude (power)

This page lists examples of the power in watts produced by various sources of energy.

New!!: Luminosity and Orders of magnitude (power) · See more »

Parallax

Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.

New!!: Luminosity and Parallax · See more »

Parsec

The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.

New!!: Luminosity and Parsec · See more »

Passband

A passband is the range of frequencies or wavelengths that can pass through a filter.

New!!: Luminosity and Passband · See more »

Photometric system

In astronomy, a photometric system is a set of well-defined passbands (or filters), with a known sensitivity to incident radiation.

New!!: Luminosity and Photometric system · See more »

Photometry (astronomy)

Photometry is a technique of astronomy concerned with measuring the flux, or intensity of an astronomical object's electromagnetic radiation.

New!!: Luminosity and Photometry (astronomy) · See more »

Pleione (star)

Pleione, designated 28 Tauri and BU Tauri (abbreviated 28 Tau or BU Tau), is a binary star and the seventh-brightest star in the Pleiades star cluster (Messier 45).

New!!: Luminosity and Pleione (star) · See more »

Power (physics)

In physics, power is the rate of doing work, the amount of energy transferred per unit time.

New!!: Luminosity and Power (physics) · See more »

R136a1

RMC 136a1 (usually abbreviated to R136a1) is a Wolf–Rayet star located at the center of R136, the central condensation of stars of the large NGC 2070 open cluster in the Tarantula Nebula.

New!!: Luminosity and R136a1 · See more »

Radiant energy

In physics, and in particular as measured by radiometry, radiant energy is the energy of electromagnetic and gravitational radiation.

New!!: Luminosity and Radiant energy · See more »

Radius

In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length.

New!!: Luminosity and Radius · See more »

Redshift

In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum.

New!!: Luminosity and Redshift · See more »

Rest frame

In special relativity the rest frame of a particle is the coordinate system (frame of reference) in which the particle is at rest.

New!!: Luminosity and Rest frame · See more »

Solar luminosity

The solar luminosity,, is a unit of radiant flux (power emitted in the form of photons) conventionally used by astronomers to measure the luminosity of stars, galaxies and other celestial objects in terms of the output of the Sun.

New!!: Luminosity and Solar luminosity · See more »

Spectral flux density

In spectroscopy, spectral flux density is the quantity that describes the rate at which energy is transferred by electromagnetic radiation through a real or virtual surface, per unit surface area and per unit wavelength.

New!!: Luminosity and Spectral flux density · See more »

Spectral index

In astronomy, the spectral index of a source is a measure of the dependence of radiative flux density (that is, radiative flux per unit of frequency) on frequency.

New!!: Luminosity and Spectral index · See more »

Sphere

A sphere (from Greek σφαῖρα — sphaira, "globe, ball") is a perfectly round geometrical object in three-dimensional space that is the surface of a completely round ball (viz., analogous to the circular objects in two dimensions, where a "circle" circumscribes its "disk").

New!!: Luminosity and Sphere · See more »

Springer Science+Business Media

Springer Science+Business Media or Springer, part of Springer Nature since 2015, is a global publishing company that publishes books, e-books and peer-reviewed journals in science, humanities, technical and medical (STM) publishing.

New!!: Luminosity and Springer Science+Business Media · See more »

Star

A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.

New!!: Luminosity and Star · See more »

Stefan–Boltzmann constant

The Stefan–Boltzmann constant (also Stefan's constant), a physical constant denoted by the Greek letter ''σ'' (sigma), is the constant of proportionality in the Stefan–Boltzmann law: "the total intensity radiated over all wavelengths increases as the temperature increases", of a black body which is proportional to the fourth power of the thermodynamic temperature.

New!!: Luminosity and Stefan–Boltzmann constant · See more »

Stefan–Boltzmann law

The Stefan–Boltzmann law describes the power radiated from a black body in terms of its temperature.

New!!: Luminosity and Stefan–Boltzmann law · See more »

Stellar classification

In astronomy, stellar classification is the classification of stars based on their spectral characteristics.

New!!: Luminosity and Stellar classification · See more »

Stellar parallax

Stellar parallax is the apparent shift of position of any nearby star (or other object) against the background of distant objects.

New!!: Luminosity and Stellar parallax · See more »

Sun

The Sun is the star at the center of the Solar System.

New!!: Luminosity and Sun · See more »

Synonym

A synonym is a word or phrase that means exactly or nearly the same as another word or phrase in the same language.

New!!: Luminosity and Synonym · See more »

Telescope

A telescope is an optical instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light).

New!!: Luminosity and Telescope · See more »

Time

Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future.

New!!: Luminosity and Time · See more »

UBV photometric system

The UBV photometric system (Ultraviolet, Blue, Visual), also called the Johnson system (or Johnson-Morgan system), is a wide band photometric system for classifying stars according to their colors.

New!!: Luminosity and UBV photometric system · See more »

University of Chicago Press

The University of Chicago Press is the largest and one of the oldest university presses in the United States.

New!!: Luminosity and University of Chicago Press · See more »

Vega

Vega, also designated Alpha Lyrae (α Lyrae, abbreviated Alpha Lyr or α Lyr), is the brightest star in the constellation of Lyra, the fifth-brightest star in the night sky, and the second-brightest star in the northern celestial hemisphere, after Arcturus.

New!!: Luminosity and Vega · See more »

Very-long-baseline interferometry

Very-long-baseline interferometry (VLBI) is a type of astronomical interferometry used in radio astronomy.

New!!: Luminosity and Very-long-baseline interferometry · See more »

Watt

The watt (symbol: W) is a unit of power.

New!!: Luminosity and Watt · See more »

Wavelength

In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.

New!!: Luminosity and Wavelength · See more »

Wolf–Rayet star

Wolf–Rayet stars, often abbreviated as WR stars, are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of highly ionised helium and nitrogen or carbon.

New!!: Luminosity and Wolf–Rayet star · See more »

54 Piscium

54 Piscium is an orange dwarf star approximately 36 light-years away in the constellation of Pisces.

New!!: Luminosity and 54 Piscium · See more »

Redirects here:

Bolometric luminosities, Bolometric luminosity, Luminocity, Luminosities, Luminosity (astronomy), Lumunosity, Stellar Luminosity, Stellar luminosity, Superluminous.

References

[1] https://en.wikipedia.org/wiki/Luminosity

OutgoingIncoming
Hey! We are on Facebook now! »