It has a mass of and a radius of .

The sun is the brightest star.

The sun is the most brilliant star.

The other bright star in Chamaeleon is Delta Chamaeleontis, a wide double star.

Altair has a magnitude of 0.76.

Sirius is the brightest star in the night sky.

In systems where the brightnesses are different, the fainter star is bluer if the brighter star is a giant star, and redder if the brighter star belongs to the main sequence.

And there is a bright star called Deneb. So let's select Deneb.

But that bright star there is actually one of the stars in the galaxy.

The brighter star of a visual binary is the primary star, and the dimmer is considered the secondary.

The brightest member, which is the third brightest star in the constellation Cygnus, is actually a close binary itself.

The second brightest star, the yellow white subgiant star Alpha Trianguli (3.41m) with a close dimmer companion, is also known as Caput Trianguli or Ras al Muthallath, and is at the apex of the triangle.

The brighter star is Delta2 Chamaeleontis, a blue hued star of magnitude 4.4, 364 light years from Earth.

The brightest member is the white giant star Beta Trianguli of apparent magnitude 3.00, lying 127 light years distant from Earth.

The bright southern star Acrux, in the Southern Cross, was discovered to be double by Father Fontenay in 1685.

Its brightest star is MQ Trianguli Australis at apparent magnitude 7.1.

The primary is a yellow star of magnitude 3.4 and the secondary is a blue star of magnitude 6.7.

The brightest star is Alpha Sculptoris, an SX Arietis type variable star with a spectral type B7IIIp and an apparent magnitude of 4.3.

This means that a first magnitude star ( 1.00) is about 2.5 times brighter than a second magnitude ( 2.00) star, and approximately 100 times brighter than a sixth magnitude star ( 6.00).

Capella is the brightest star in the constellation Auriga, the sixth brightest in the night sky and the third brightest in the northern celestial hemisphere, after Arcturus and Vega.

Polaris ( UMi, Ursae Minoris, Alpha Ursae Minoris, commonly North Star, Northern Star or Pole Star, also Lodestar, sometimes Guiding Star) is the brightest star in the constellation Ursa Minor, and the 45th brightest star in the night sky.

Aldebaran (α Tau, α Tauri, Alpha Tauri) is an orange giant star located about 65 light years away in the zodiac constellation of Taurus.

Betelgeuse (, , or ), also known by its Bayer designation Alpha Orionis (shortened to α Orionis or α Ori), is the ninth brightest star in the night sky and second brightest in the constellation of Orion.

Algol gives its name to its class of eclipsing variable, known as Algol variables.

Alpha Persei (Alpha Per, α Persei, α Per) is the brightest star in the northern constellation of Perseus, just outshining the constellation's best known star, Algol.

This is caused by the passage of the dimmer member of the pair in front of the brighter star.

It is the 19th brightest star in the night sky, with an apparent magnitude of 1.25.

It is the brightest star in the constellation with an apparent magnitude of 2.7.

Maia is a blue giant of spectral type B8 III, and a mercury manganese star.

Rigel, also known by its Bayer designation Beta Orionis (β Ori, β Orionis), is the brightest star in the constellation Orion and the seventh brightest star in the night sky, with visual magnitude 0.13.

Spica ( α Vir, α Virginis, Alpha Virginis) is the brightest star in the constellation Virgo, and the 15th brightest star in the night sky.

Alpha Andromedae (Alpha And, α And, α Andromedae), which has the traditional names Alpheratz (or Alpherat) and Sirrah (or Sirah), is the brightest star in the constellation of Andromeda.

On both apparent and absolute magnitude scales, the smaller the magnitude number, the brighter the star the larger the magnitude number, the fainter.

Alpha Trianguli Australis, known as Atria, is a second magnitude orange giant and the brightest star in the constellation, as well as the 42nd brightest star in the night sky.

Alpha Horologii, the brightest, is an orange giant of magnitude 3.9, 117 light years from Earth.

From Proxima Centauri, the Sun would appear as a bright 0.4 magnitude star in the constellation Cassiopeia.

The constellation's brightest star is Alpha Pictoris, a white main sequence star of apparent (visual) magnitude 3.3 around 97 light years away from Earth.

Sirius, the brightest star in the night sky as seen from Earth, is approximately 23 times more luminous than the Sun, while Canopus, the second brightest star in the night sky with an absolute magnitude of 5.53, is approximately 14,000 times more luminous than the Sun.

What they have in common is a moderate increase in size and luminosity compared to main sequence stars of the same mass or temperature, and are hot enough to be called blue, meaning spectral class O, B, and sometimes early A.

Pictor is a small faint constellation in the Southern Celestial Hemisphere, located between the brilliant star Canopus and the Large Magellanic Cloud.

In these three cases the secondary star was much dimmer than the primary and so was not previously detected.

The red or pinkish glow originates from hydrogen gas predominantly behind the nebula, ionized by the nearby bright star Sigma Orionis.

Gamma Pegasi (γ Peg) is a star in the constellation of Pegasus, located at the southwest corner of the asterism known as the Great Square.

This in turn causes the star to become more luminous (from 1,000 10,000 times brighter) and expand the degree of expansion outstrips the increase in luminosity, causing the effective temperature to decrease.

The brighter component, termed Sirius A, is a main sequence star of spectral type A1V, with an estimated surface temperature of 9,940 K. Its companion, Sirius B, is a star that has already evolved off the main sequence and become a white dwarf.