Absolute Visual Magnitude
Absolute Visual Magnitude
Intrinsic brightness of a star; the apparent visual magnitude the star would have if it were 10 Parsecs away from earth.
Absolute Zero ...
Our Sun has an absolute visual magnitude of 4.8.
Finding the Distance to Stars - Distance Modulus ...
In astronomy, absolute magnitude (also known as absolute visual magnitude when measured in the standard V phometric band) measures a celestial object's intrinsic brightness.
Sirius A has an absolute visual magnitude of 1.42 and Sirius B, 11.18. The age of the star system is estimated to be between 200 and 300 million years.
heat index The difference between the absolute visual magnitude of a star and the absolute radiometric magnitude (Mv - Mr).
To compare true visual luminosities, astronomers calculate the ~ (M), the apparent magnitude the star would have were it at a distance of 32.6 light years (10 parsecs, where the parsec is the professional unit of distance, equal to 3.26 light years).
Facts and figures about the 25 brightest stars, including apparent and ~, distance and spectral type.
The 30 closest stars
Facts and figures about the 30 closest stars to Earth, including apparent and ~, distance and spectral type.
Normally one must state the frequency range over which the measurement is made. The Sun has an ~ of 4.83, and the brightest star in the sky, Sirius, has an ~ of 1.4 and an apparent magnitude of -4.6.
Its integrated ~ has been estimated to be âˆ'20.9. Most of the mass of the Galaxy is thought to be dark matter, forming a dark matter halo of an estimated 600-3000 billion solar masses (Mâ˜‰) which is spread out relatively evenly.
Galactic center ...
For the M95 distance modulus (30 mag), this corresponds to an ~ of -3 mag.
38,000 times brighter than the sun. ~, Mv =-6.7
Where to View:
Located in the constellation of Cepheus (Star Map) ...
This table shows the apparent and ~s of some stars and their distances:
Classical ellipticals (E galaxies), with their bright compact nuclei and steep brightness gradients, range from ~ MV ~ -23 down to MV ~ -16 mag.
6 parsecs (the Sirius system is one of Earth's near neighbors. Sirius A is about twice as massive as the Sun and has an ~ of 1.42. It is 25 times more luminous than the Sun but has a significantly lower luminosity than other bright stars such as Canopus or Rigel.
034 magnitudes, and an ~ of 17.47 +/- 0.04 (A.O. abstract) -- "in excellent agreement with those of the U.S Naval Observatory (Conrad Dahn, private communications." Useful catalogue numbers for this star include: SO025300.5+165258, SO25300.5+165258, SO J025300.
See also: What is the meaning of Star, Visual magnitude, Magnitude, Earth, Sun?