| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 23m 51.6206s |
| Declination | +32° 11' 24.619" |
| Apparent magnitude (V) | 4.436 |
| Characteristics | |
| Spectral type | K3III |
| U−B color index | +1.50 |
| B−V color index | +1.33 |
| Astrometry | |
| Radial velocity (Rv) | -14.6 km/s |
| Proper motion (μ) | RA: 35.71 mas/yr Dec.: -5.81 mas/yr |
| Parallax (π) | 12.77 ± 0.62 mas |
| Distance | 260 ± 10 ly (78 ± 4 pc) |
| Other designations | |
39 Cygni (39 Cyg) is a star in the constellation Cygnus, approximately 260 light years away from Earth. It is an orange star of the spectral type K3III, meaning it has a surface temperature of 3,500 to 5,000 kelvins. It is cooler, but much larger and brighter, than our Sun.[1]
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