Multiple questions.
See related questions.
Brightness can be looked at in two ways. How it seen to us and how bright it really is.
Looking at the Magnitude (comparative brightness) the Sun is the leader. However when people say "star" they often exclude the the Sun because it shines during the "daylight" hours and they mean stars which are visible at night. In that case Sirius is the brightest star in the night sky. On an absolute basis (how bright it is, not how bright it seems in comparison to other stars in the night sky) Cygnus OB2-12 (a very bright blue hypergiant) is the winner. It is more than 6 million times brighter than the Sun, but is 5000 light-years away .
The Sun seems bright to us because it is so close (only 93 million miles away). Sirius is bigger (See Link for comparison of sizes of the sun and other stars) The Sun is called a yellow dwarf to indicate its small size and cool temperature. Sirius is 2.6 parsecs (8.6 light-years) from Earth and twice as massive as the Sun. It is 25 times more luminous than the Sun.
Interestingly Sirius used to have a companion star that was equally as bright but it has now changed to a white dwarf.
Sirius A is 2.02 times the mass of our Sun. Sirius B (a dwarf star) is 0.978 times the mass of our Sun. Data from Wikipedia.
Sirius A is 2.02 times the mass of our Sun. Sirius B (a dwarf star) is 0.978 times the mass of our Sun. Data from Wikipedia.
Sirius A is 2.02 times the mass of our Sun. Sirius B (a dwarf star) is 0.978 times the mass of our Sun. Data from Wikipedia.
Sirius A is 2.02 times the mass of our Sun. Sirius B (a dwarf star) is 0.978 times the mass of our Sun. Data from Wikipedia.
We can. Alpha Centauri is one of the brightest stars in the sky. Because of its position in the sky, however, it is not visible to most of the northern hemisphere. Proxima Centauri is not visible from Earth because it is too dim.
Alpha Centauri is actually a three-star system. Two of the stars, Alpha Centauri B and C are dimmer than the sun while Alpha Centauri A is about 50% brighter. Altogether the system is about twice the luminosity of the sun.
Of the stars within 10 light years, it's the most intrinsically bright.
On the grand scale, it's not particularly noteworthy, but because it's so close, it appears to outshine ... slightly ... real standouts like Rigel and Canopus (which are much further away).
Sirius A is the brightest star in the sky after our sun. Its not the closest star, but is one of the closest. It also has a high luminosity, with a white spectral class and surface temperature of around 10,000 Kelvin. Its a combination of its proximity and its actual brightness that makes it the brightest star when viewed from earth (after the sun). There are closer stars, but most in our neighbourhood are red dwarfs which burn much less brightly.
A combination of it's close distance and it's luminosity. It's one of the closest stars to us at around 8.6 light years (there are actually two stars, Sirius A is the bright one though). There are closer stars to us than this star system, but most of these are dim red dwarfs. Compared with the sun, sirius A is around 25 times brighter (absolute magnitude) and twice as massive. It is a hot, brightly burning white star, with a temperature of around 25,000 kelvin at the surface.
So 1.711 x 109 gives about 186.5 times larger than the Earth.
Alpha Centauri is a star system containing 3 stars.
A star system
Operation Alpha Centauri happened in 1986.
Sid Meier's Alpha Centauri happened in 1999.
Alpha Centauri is a binary star system, commonly known as Alpha Centauri ABAlpha Centauri A is about the same size and age as our Sun with a spectral type of G2VAlpha Centauri B is about 14% smaller that our Sun and a lot cooler having a spectral type of K1VThere is a third star, not surprisingly called Alpha Centauri C or Proxima Centauri which is the closest star to Earth.See related link for more information.
Alpha centauri is not part of the solar system.
Alpha Centauri is a star, it cannot have satellites. Satellites orbit planets.
Proxima Centauri Alpha Centauri A Alpha Centauri B
Alpha Centauri A has an apparent magnitude of -0.01
A star system
Alpha Centauri does not orbit the sun.
No, Proxima Centauri and Alpha Centauri do not revolve around each other.
Alpha Centauri has a mass of 1.1 solar masses.
Alpha Centauri is a multiple-star system.
Operation Alpha Centauri happened in 1986.
Alpha Centauri is the nearest star system. Its a binary star system of Alpha Centauri A and Alpha Centauri B. If someone asks you what is the nearest star ? then the answer will be "proxima centauri" in my opinion. nearest star: proxima centauri nearest star system: Alpha centauri A and B. Some people believe that its a triple star system of Prixma, Alpha A and Alpha B. centauri.
Alpha Centauri is a triple star system. Alpha Centauri A, B & C or Proxima Centauri. Alpha Centauri A & B are 4.37 light years from the Earth whereas Alpha Centauri C is 4.243 light years.
Alpha Centauri is the brightest star in the Centaurus constellation, the "Centaur".