Epsilon Cygni
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Epsilon Cygni A (53 Cygni) / B (52 Cygni) |
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Cygnus |
| Right ascension | 20h 46m 12.7s |
| Declination | +33° 58′ 12.9″ |
| Apparent magnitude (V) | 2.50/13.40 |
| Characteristics | |
| Spectral type | K0 III/M3 |
| U-B color index | 0.87 |
| B-V color index | 1.03/1.66 |
| Variable type | ? |
| Astrometry | |
| Radial velocity (Rv) | −11.5 km/s |
| Proper motion (μ) | RA: 356.16 mas/yr Dec.: 330.28 mas/yr |
| Parallax (π) | 45.26 ± 0.53 mas |
| Distance | 72.1 ± 0.8 ly (22.1 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.08/11.99 |
| Visual binary orbit | |
| Companion | Epsilon Cygni B (52 Cygni) |
| Details | |
| Mass | 2–4 M☉ |
| Radius | 12–16 R☉ |
| Luminosity | 40–61 L☉ |
| Temperature | 4,675 K |
| Metallicity | 70% Sun |
| Age | 1.5 × 109 years |
| Other designations | |
| Database references | |
| SIMBAD | data |
Epsilon Cygni (ε Cyg / ε Cygni) is a star in the constellation Cygnus. Its traditional name is Gienah, however Gamma Corvi has an identical traditional name.
Epsilon Cygni is a cool orange giant star that is, as many visible stars tend to be, well along in terms of its stellar evolution. While young in comparison to the Sun its larger mass gives it a much shorter lifespan, and the star is in the beginning stages of its death. It's 72 light-years from the earth.
The name "Gienah" derives from the Arabic word for wing, جناح janāħ.
[edit] See Also
[edit] External links
- http://www.tcaep.co.uk/astro/constell/20460042.htm
- http://www.skyhound.com/sh/archive/aug1/NGC_6960.html
- http://www.pbase.com/mcrowle/image/81902791
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