シリウス
9Alp CMa
シリウス 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, シリウス is one of the Sun's closest stellar neighbors. Light that we observe from シリウス today left the star roughly 8 years ago, making it a near neighbor in galactic terms.
シリウス is classified as a spectral class A star (A-type (White)) on the Harvard spectral classification system.
With an apparent magnitude of -1.44, シリウス 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.
物理的特性
| スペクトル型 | Class A — A-type (White) |
| 色指数 (B−V) | 0.009 |
観測
| 見かけの等級 | -1.44 |
| 絶対等級 | 1.45 |
| 距離 | 8.6 ly |
| 星座 | Canis Major |
位置
| 赤経 | 6h 45.15m |
| 赤緯 | -16° 42.97′ |
Related Chemistry
Explore the chemical elements connected to シリウス 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
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