HD 177808
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 04m 57.87471s |
| Declination | +31° 44′ 38.6552″ |
| Apparent magnitude (V) | 5.63 |
| Characteristics | |
| Spectral type | M0III |
| B−V color index | 1.548±0.003 |
| Astrometry | |
| Radial velocity (Rv) | 3.47±0.14 km/s |
| Proper motion (μ) | RA: +75.049 mas/yr Dec.: −76.913 mas/yr |
| Parallax (π) | 5.8624±0.0556 mas |
| Distance | 556 ± 5 ly (171 ± 2 pc) |
| Absolute magnitude (MV) | −0.75 |
| Details | |
| Mass | 4.8 M☉ |
| Radius | 48 R☉ |
| Luminosity | 637 L☉ |
| Surface gravity (log g) | 1.17 cgs |
| Temperature | 4,452 K |
| Other designations | |
| BD+31°3453, GC 26266, HD 177808, HIP 93718, HR 7237, SAO 67782 | |
| Database references | |
| SIMBAD | data |
HD 177808 is a 6th magnitude star in the constellation Lyra, approximately 556 light years away from Earth. It is a solitary red giant star of the spectral type M0III, meaning it possesses a surface temperature of around 3,940 kelvins. It is therefore much larger and brighter than the Sun, yet cooler in comparison.