Solar luminosity

luminosity of the SunSun's luminosityluminositysolar luminositiesof the SunSunas the Sunluminous as the Sunthat of the Sunthe Sun
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.wikipedia
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Luminosity

luminousbolometric luminosityluminosities
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.
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 (M bol ) 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.

Solar cycle

solar activitysunspot cyclesolar variation
The Sun is a weakly variable star, and its actual luminosity therefore fluctuates.
Satellite monitoring of solar luminosity revealed a direct relationship between the Schwabe cycle and luminosity with a peak-to-peak amplitude of about 0.1%.

Solar mass

mass of the SunSun's masssolar masses
Solar mass
Most of this energy eventually radiates away from the Sun.

Triple-alpha process

helium fusionhelium burningtriple alpha process
Triple-alpha process
During the core flash, the star's energy production can reach approximately 10 11 solar luminosities which is comparable to the luminosity of a whole galaxy, although no effects will be immediately observed at the surface, as it is hidden by the star's overlying layers.

Solar radius

radius of the SunSun's radiussolar radii
Solar radius
Solar luminosity

Future of Earth

end of life on Earthfuture of the Earthred giant star
These include the chemistry at Earth's surface, the rate of cooling of the planet's interior, the gravitational interactions with other objects in the Solar System, and a steady increase in the Sun's luminosity.

Megamaser

megamasers
Megamasers have typical luminosities of 10 3 solar luminosities, which is 100 million times brighter than masers in the Milky Way, hence the prefix mega.

Faint young Sun paradox

this modelfaint young SunFaint Young Sun period
With the predicted solar luminosity 4 billion (4 × 10 9 ) years ago and with greenhouse gas concentrations the same as are current for the modern Earth, any liquid water exposed to the surface would freeze.

Dorado Group

All together, the group has an overall luminosity of 7.8 ± 1.6 L ⊙.

Earth

terrestrialworldGlobal
In this model, atmospheric "greenhouse gases" kept the oceans from freezing when the newly forming Sun had only 70% of its current luminosity.

Sagittarius B2

Sgr B2
The 5-parsec-wide core of the cloud is a star-forming region that is emitting about 10 million times the luminosity of the Sun.

Kapteyn's Star

Kapteyn
Its diameter is 30% of the Sun's, but its luminosity just 1.2% that of the Sun's.

Epsilon Piscis Austrini

ε PsAε Piscis Austrini
The star has 4.1 times the mass of the Sun and is radiating 661 times the solar luminosity from its photosphere at an effective temperature of 11,066 K.

Lambda Piscis Austrini

λ PsAλ Piscis Austrini
It is radiating 249 times the solar luminosity from its photosphere at an effective temperature of 12,023 K.

FSC15307+3253

FSC15307+3253 (or IRAS F15307+3252) is an ultraluminous infrared galaxy (ULIRG), with a luminosity between 8 and 1000 µm of approximately 2 L ⊙, possibly the highest currently known.

Rare Earth hypothesis

how improbableis truly aloneRare Earth:Why Complex Life is Uncommon in the Universe
The Sun has a low 0.1% luminosity variation.

NGC 1553

1553
NGC 1553 is an early type galaxy with a luminosity of 4 L ⊙ . It has been detected in H I but has an H I mass to B-band luminosity ratio (M HI /L B ) of less than 0.01.

NGC 3621

3621
The galaxy is around 93000 ly across and is inclined at an angle of 25° from being viewed edge on. It shines with a luminosity equal to 13 billion times that of the Sun.

Global warming

climate changeglobal climate changeanthropogenic climate change
Examples of external forcings include changes in the composition of the atmosphere (e.g., increased concentrations of greenhouse gases), solar luminosity, volcanic eruptions, and variations in Earth's orbit around the Sun.

Centaurus

Cena picture of himselfCentaur
It is also the most luminous globular cluster in the Milky Way, at over one million solar luminosities.

HD 179949

V5652 Sgr
Its photosphere is shining with 1.95 times the solar luminosity at an effective temperature of 6,220 K.

Gamma Serpentis

γ Serγ SerpentisGamma
Gamma Serpentis is an ordinary F-type main sequence star with a stellar classification of F6 V. It is larger and more massive than the Sun, with three times the solar luminosity.

Red dwarf

redred dwarf starsred dwarfs
Even the largest red dwarfs (for example HD 179930, HIP 12961 and Lacaille 8760) have only about 10% of the Sun's luminosity.

Procyon

Canis minorProcyon Aα CMi
It is 1.5 times the solar mass, twice the solar radius, and has 7 times the Sun's luminosity.