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For example, a star of absolute magnitude M V = 3.0 would be 100 times as luminous as a star of absolute magnitude M V = 8.0 as measured in the V filter band. The Sun has absolute magnitude M V = +4.83. [1] Highly luminous objects can have negative absolute magnitudes: for example, the Milky Way galaxy has an absolute B magnitude of about −20 ...
Epsilon Cassiopeiae or ε Cassiopeiae, officially named Segin (/ ˈ s ɛ ɡ ɪ n /), [10] [11] is a single [12] star in the northern constellation of Cassiopeia.With an apparent visual magnitude of 3.4, this is one of the brightest stars in the constellation.
Visual magnitude (m V) Proper name [8] Bayer designation Distance Spectral type Celestial Hemisphere 0 −26.74 Sun: 0.0 G2 V 1 −1.46 Sirius: α CMa 8.6 A0mA1 Va, DA2 Southern 2 −0.74 Canopus: α Car 310 A9 II Southern 3 −0.27 (0.01 + 1.33) Rigil Kentaurus & Toliman: α Cen 4.34 G2 V, K1 V Southern 4 −0.05 Arcturus
The absolute magnitude M, of a star or astronomical object is defined as the apparent magnitude it would have as seen from a distance of 10 parsecs (33 ly). The absolute magnitude of the Sun is 4.83 in the V band (visual), 4.68 in the Gaia satellite's G band (green) and 5.48 in the B band (blue).
First-magnitude stars are the brightest stars in the night sky, with apparent magnitudes lower (i.e. brighter) than +1.50. [1] [2] Hipparchus, in the 1st century BC, introduced the magnitude scale. He allocated the first magnitude to the 20 brightest stars and the sixth magnitude to the faintest stars visible to the naked eye.
The brightest-known M class main-sequence star is Lacaille 8760, class M0V, with magnitude 6.7 (the limiting magnitude for typical naked-eye visibility under good conditions being typically quoted as 6.5), and it is extremely unlikely that any brighter examples will be found.
Because the orbit of Mars is considerably eccentric its brightness at opposition can range from magnitude −3.0 to −1.4. [14] The minimum brightness is about magnitude +1.6 [14] when Mars is on the opposite site of the Sun from the Earth. Rotational variations can elevate or suppress the brightness of Mars by 5% and global dust storms can ...
Phi Herculis (φ Her) is a binary star [4] system in the northern constellation of Hercules.Based upon an annual parallax shift of 15.99 mas as seen from Earth, [1] it is located around 204 light years from the Sun.