Characteristics

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**Sirius**  is the brightest star in the night sky with a visual apparent magnitude of −1.46, almost twice as bright as Canopus, the next brightest star. Sirius appears bright due to both its complicated luminosity and its closeness to the Earth. At a distance of 8.6 light-years, the Sirius system is one of our near neighbors.But still that means to go there traveling on light it would take 8.7 years. Sirius A is about twice as massive as the Sun and has an absolute visual magnitude 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. The system is between 200 and 300 million years old. It was originally composed of two bright bluish stars. The more massive of these, Sirius B, consumed its resources and became a red giant before shedding its outer layers and collapsing into its current state as a white dwarf around 120 million years ago.

 Epoch J2000.0 Equinox J2000.0 (ICRS) || Dec.: −1223.1 || (Sirius B) || (secondary) || 147.3° || 25,200 (B) K ||  
 * ~ Observation data
 * ~ Characteristics ||
 * **Spectral type** || A1V (A) ||
 * **U-B color index** || −0.05 (A) ||
 * **B-V color index** || 0.01 (A) ||
 * ~ Astrometry ||
 * **Radial velocity (Rv) ** || −7.6 ||
 * **Proper motion (μ) ** || RA: −546.05 mas/yr
 * **Parallax (π) ** || 379.21 ± 1.58 ||
 * **Distance** || 8.6 ± 0.04 ly ||
 * **Absolute magnitude (MV) ** || 1.42 (A) ||
 * **Orbit** ||
 * **Companion** || α CMa B
 * **Period (P) ** || 50.09 yr ||
 * **Semimajor axis (a) ** || 7.56" ||
 * **Eccentricity (e) ** || 0.592 ||
 * **Inclination (i) ** || 136.5° ||
 * **Longitude of the node (Ω) ** || 44.6° ||
 * **Periastron epoch (T) ** || 1894.13 ||
 * **Argument of periastron (ω) **
 * ~ Details ||
 * ~ [[image:http://www.atlantis-motherland.com/images/SiriusOrbit.jpg width="397" height="227" align="right"]] ||
 * **Mass** ||  ||
 * **Radius** || 1.711 ||
 * **Surface gravity (log //g//) ** || 4.33 ||
 * **Luminosity** || 25.7 ||
 * **Temperature** || 9,940[9 (A)
 * **Metallicity** || [Fe/H] =0.50[11 (A) ||
 * **Rotation** || 16 km/s[12 (A) ||
 * **Age** || 2-3 × 108 [7 years ||

 

