Gamma Cygni
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- For other uses of "Sadr", see Sadr.
| Observation data Epoch J2000 |
|
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 22m 13.7s |
| Declination | +40° 15′ 24″ |
| Apparent magnitude (V) | 2.23 |
| Spectral Characteristics | |
| Spectral type | F8 Ib |
| U-B color index | 0.53 |
| B-V color index | 0.673 |
| Variable type | Pulsating |
| Astrometry | |
| Radial velocity (Rv) | -7.5 km/s |
| Proper motion (μ) | RA: 2.43 mas/yr Dec.: -0.93 mas/yr |
| Parallax (π) | 2.43 ± 0.51 mas |
| Distance | approx. 1300 ly (approx. 410 pc) |
| Absolute magnitude (MV) | -6.12 |
| Physical Characteristics | |
| Mass | 12 M☉ |
| Radius | 225 R☉ |
| Luminosity | 65,000 L☉ |
| Temperature | 6,500 K |
| Metallicity | ? |
| Rotation | 20 km/s. |
| Age | ? years |
| Other designations | |
Gamma Cygni (γ Cyg / γ Cygni) is a star in the constellation Cygnus. It also has the traditional name Sadr (also spelled Sadir or Sador).
The traditional name comes from the Arabic word صدر şadr, "chest", the same word which gave rise to the star Schedar (Alpha Cassiopeiae).
This star is surrounded by a diffuse nebula called IC1318, or the Gamma Cygni region.
[edit] External links
- Sadr by Jim Kaler.
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