Sirio
9Alp CMa
Sirio is a A-type (White) star located in the constellation Canis Major. It carries the designation 9Alp CMa.
At a distance of approximately 8.60 light-years, Sirio is one of the Sun's closest stellar neighbors. Light that we observe from Sirio today left the star roughly 8 years ago, making it a near neighbor in galactic terms.
Sirio is classified as a spectral class A star (A-type (White)) on the Harvard spectral classification system.
With an apparent magnitude of -1.44, Sirio is one of the brightest stars in the entire night sky. It is easily visible to the naked eye from virtually any location on Earth where it rises above the horizon, and it can even be glimpsed in moderate light pollution. Observers will note its blue-white hue, which corresponds to a B-V color index of +0.009.
Propiedades físicas
| Clase Espectral | Class A — A-type (White) |
| Índice de color (B−V) | 0,009 |
Observación
| Magnitud Aparente | -1.44 |
| Magnitud Absoluta | 1,45 |
| Distancia | 8.6 ly |
| Constelación | Canis Major |
Posición
| Ascensión recta | 6h 45,15m |
| Declinación | -16° 42,97′ |
Related Chemistry
Explore the chemical elements connected to Sirio on our sister site ChemFYI.
A-type stars show the strongest hydrogen Balmer absorption lines
Second most abundant element in Sirius's atmosphere
Detectable absorption lines in A-type stellar spectra
Part of the Science FYI Family