HD 177808 is a 6th magnitude star in the constellation Lyra, approximately 610 light years away from Earth. It is a solitary[5] 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.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 04m 57.87462s[1] |
| Declination | +31° 44′ 38.6538″[1] |
| Apparent magnitude (V) | 5.63[2] |
| Characteristics | |
| Spectral type | M0III[3] |
| B−V color index | 1.548±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | 3.47±0.14[2] km/s |
| Proper motion (μ) | RA: +74.989[1] mas/yr Dec.: −76.884[1] mas/yr |
| Parallax (π) | 5.9150 ± 0.0831 mas[1] |
| Distance | 551 ± 8 ly (169 ± 2 pc) |
| Absolute magnitude (MV) | −0.75[2] |
| Details | |
| Radius | 42.27+1.26 −4.39[1] R☉ |
| Luminosity | 387.9±6.8[1] L☉ |
| Temperature | 3,940+233 −58[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |