Arcturus
16Alp Boo
Arcturus is a K-type (Orange) star. It carries the designation 16Alp Boo.
Arcturus lies approximately 36.7 light-years from Earth, placing it within the Sun's local stellar neighborhood. This relatively short cosmic distance means the light reaching us today departed the star only about 36 years ago.
Arcturus is classified as a spectral class K star (K-type (Orange)) on the Harvard spectral classification system.
With an apparent magnitude of -0.05, Arcturus 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 orange hue, which corresponds to a B-V color index of +1.239.
物理特性
| 光谱类型 | Class K — K-type (Orange) |
| 色指数 (B−V) | 1.239 |
观测
| 视星等 | -0.05 |
| 绝对星等 | -0.31 |
| 距离 | 36.7 ly |
位置
| 赤经 | 14h 15.66m |
| 赤纬 | 19° 10.94′ |
Related Chemistry
Explore the chemical elements connected to Arcturus on our sister site ChemFYI.
Metal-poor giant ([Fe/H] ≈ −0.5) — fewer iron-peak elements
Titanium lines visible in K-type giant spectra
Strong Ca II infrared triplet used to measure surface gravity
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