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The Sun is the brightest star as viewed from Earth, at −26.78 mag. The second brightest is Sirius at −1.46 mag. For comparison, the brightest non-stellar objects in the Solar System have maximum brightnesses of: the Moon −12.7 mag [1] Venus −4.92 mag; Jupiter −2.94 mag; Mars −2.94 mag; Mercury −2.48 mag; Saturn −0.55 mag [2]
If this object were 10 parsecs away from Earth it would appear nearly as bright in the sky as the Sun (apparent magnitude −26.744). This quasar's luminosity is, therefore, about 2 trillion (10 12) times that of the Sun, or about 100 times that of the total light of average large galaxies like our Milky Way. (Note that quasars often vary ...
Brightest planet −2.20 [6]: 39 −2.94 [6]: 39 Jupiter: Planet −1.46 Sirius: Binary star system: Brightest night star −0.74 Canopus: Star −0.29 [7] Alpha Centauri AB Binary star system Part of a triple star system with Proxima Centauri: −0.05 Arcturus: Star Brightest Population II star 0.03 −0.02 Vega: Star 0.08 0.03 [8] Capella ...
For example, a magnitude 2.0 star is 2.512 times as bright as a magnitude 3.0 star, 6.31 times as magnitude 4.0, and 100 times magnitude 7.0. The brightest astronomical objects have negative apparent magnitudes: for example, Venus at −4.2 or Sirius at −1.46.
Sirius A is about twice as massive as the Sun (M ☉) and has an absolute visual magnitude of +1.43. It is 25 times as luminous as the Sun, [18] but has a significantly lower luminosity than other bright stars such as Canopus, Betelgeuse, or Rigel. The system is between 200 and 300 million years old. [18]
Fifth brightest star in the night sky. [71] Altair (α Aquilae) 2.01 × 1.57 [104] Twelfth brightest star in the night sky. Sirius (α Canis Majoris A) 1.713 [105] AD The brightest star in the night sky. Rigil Kentaurus (α Centauri A) 1.2175 [106] AD Third brightest star in the night sky. Sun: 1: The largest object in the Solar System.
The Sun has an apparent magnitude of −27 and Sirius, the brightest visible star in the night sky, −1.46. Venus at its brightest is -5. The International Space Station (ISS) sometimes reaches a magnitude of −6.
M bol,⊙ is the bolometric magnitude of the Sun; M bol,★ is the bolometric magnitude of the star. In August 2015, the International Astronomical Union passed Resolution B2 [9] defining the zero points of the absolute and apparent bolometric magnitude scales in SI units for power and irradiance (W/m 2), respectively. Although bolometric ...