アークトゥルス
16Alp Boo
アークトゥルス is a K-type (Orange) star. It carries the designation 16Alp Boo.
アークトゥルス 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.
アークトゥルス is classified as a spectral class K star (K-type (Orange)) on the Harvard spectral classification system.
With an apparent magnitude of -0.05, アークトゥルス 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 orange hue, which corresponds to a B-V color index of +1.239.
物理的特性
| スペクトル型 | Class K — K-type (Orange) |
| 色指数 (B−V) | 1.239 |
観測
| 見かけの等級 | -0.05 |
| 絶対等級 | -0.31 |
| 距離 | 36.7 ly |
位置
| 赤経 | 14h 15.66m |
| 赤緯 | 19° 10.94′ |
Related Chemistry
Explore the chemical elements connected to アークトゥルス 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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