Alpha Herculis
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 14m 38.80s |
| Declination | +14° 23′ 25.0″ |
| Apparent magnitude (V) | 3.48 / 5.4 |
| Spectral Characteristics | |
| Spectral type | M5 Ib-II / (G5III+F2V) |
| U-B color index | |
| B-V color index | 1.44 |
| Variable type | Semiregular |
| Other designations | |
| Database references | |
| SIMBAD | data |
Alpha Herculis (α Her / α Herculis) is a star in the constellation Hercules. It also has the traditional name Ras Algethi or Rasalgethi, and the Flamsteed designation 64 Herculis.
There are two components, α1 and α2. α1 is a double star system with a primary relatively massive red supergiant or bright giant star and a closer companion. α2 is a double star system with a primary yellow giant star and a secondary F dwarf star.
This star's mass is on the border that explodes as a supernova or not.
The traditional name comes from Arabic Rasalgethi from Rās al-Jathi "head of the kneeling one".
Ras Algethi has a diameter approximately 460 times greater than the Sun, and is located at a distance of 550 LY | (169 pc) .
[edit] See also
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