Sirius

<--- HD 48914 | **HD 48915** | HD 48916 --->
Sirius, Also Named **Alpha Canis Majoris**, **HD 48915**, **BD -16° 1591** or **IRAS 06429-1639**, is a Binary Star System in The Constellation Canis Major

Sirius A is a White Main Sequence Stars in The Constellation Canis Major, The Star is Located at 8.6 Light Years Away From Earth

Sirius B is a White Dwarf Stars in The Constellation Canis Major, The Star is Located at 8.71 Light Years Away From Earth

Also, Sirius is the brightest stars in the night sky, the second brightest stars in the night sky was Canopus, the third and fourth brightest stars in the night sky was Arcturus and Alpha Centauri, and the fifth brightest stars in the night sky was Vega

The name HD 48915 derives directly from the fact that the star is the 48,915th stars in the Henry Draper catalogue, and The name HR 2491 derives directly from the fact that the star in the 2,491st stars in the Bright Star catalogue

The name HIP 32349 derives directly from the fact that the star is the 32,349th stars in the Hipparcos catalogue, and The name SAO 151881 derives directly from the fact that the star is the 151,881st stars in the Smithsonian Astrophysical Star catalogue

## Information

* Right Ascension (for Sirius A): 06h 45m 08.91728s
* Declination (for Sirius A): -16° 42' 58.0171"
* Apparent Magnitude (V): -1.46 (Sirius A), +8.44 (Sirius B)

### Sirius A

* Mass: 2.118 Solar Masses
* Radius: 1.731 Solar Radius
* Luminosity: 26.22 Solar Luminosities
* Temperature: 9,926 Kelvin (9,653 °C; 17,407 °F)
* Spectral Type: A0V
* Age: 345 Million Years

### Sirius B

* Mass: 1.013 Solar Masses
* Radius: 0.0086 Solar Radius
* Luminosity: 3.041 Solar Luminosities
* Temperature: 82,161 Kelvin (81,888 °C; 147,430 °F)
* Spectral Type: DA1.6 or O8VII-O9VII
* Age: 180 Million Years
* Date of Discovery: January 31, 1862 (by Avlan Graham Clark)

### Other Designations

* Sirius A: Dog Star, Alpha Canis Majoris, 9 Canis Majoris, HD 48915, HR 2491, HIP 32349, SAO 151881, BD -16° 1591, IRAS 06429-1639, IRC -20105, TYC 5949-2777-1, 2MASS J06450887-1642566
* Sirius B: HD 48915 B, HR 2491 B, HIP 32349 B, SAO 151881 B, BD -16° 1591 B, EGGR 49, WD 0642-163

## See Also

* Altair
* Vega
* Aldebaran
* Rigel
* Betelgeuse

**Sirius** - Canopus - Alpha Centauri - Arcturus - Vega
**Top 6-10**
Capella - Rigel - Procyon - Achernar - Betelgeuse
**Top 11-15**
Hadar - Altair - Acrux - Aldebaran - Antares
**Top 16-25**
Spica - Pollux - Fomalhaut - Deneb - Mimosa - Regulus - Adhara - Shaula - Castor - Gacrux

Sun (Nearest star) - Proxima Centauri (Nearest star except sun) - Earendel (Most distant star) - HD 140283 or HE 1523-0901 (Oldest star)
**Brightness, power, size and mass**
**Sirius** (Brightest star) - R136a1 (Most luminous star) - 2MASS J0523-1403 (Least luminous star) - WR 102 (Hottest star) - S Cassiopeiae (Coldest star) - WISE J0855-0714 (Coldest brown dwarf star) - R Doradus (Largest apparent size star) - Stephenson 2-18 or NML Cygni (Largest star) - EBLM J0555-57Ab (Smallest star) - BAT99-98 or R136a1 (Most massive star) - SCR 1845-6357 (Least massive star)
**Motion**
Barnard's Star (Highest proper motion) - EY Aquarii (Lowest radial velocity) - VFTS 102 or Achernar (Highest rotational speed) - S5-HVS1 (Fastest velocity)