HD 177809
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 04m 58.2870s |
| Declination | +30° 44′ 00.257″ |
| Apparent magnitude (V) | 6.07 |
| Characteristics | |
| Evolutionary stage | AGB |
| Spectral type | M3- IIIab |
| B−V color index | +1.575 |
| Astrometry | |
| Radial velocity (Rv) | −19.35 km/s |
| Proper motion (μ) | RA: +31.265 mas/yr Dec.: −25.486 mas/yr |
| Parallax (π) | 4.9114±0.0698 mas |
| Distance | 664 ± 9 ly (204 ± 3 pc) |
| Absolute magnitude (MV) | −0.39 |
| Details | |
| Mass | 1.3 M☉ |
| Radius | 50 R☉ |
| Luminosity | 477 L☉ |
| Surface gravity (log g) | 1.81 cgs |
| Temperature | 3,798 K |
| Metallicity [Fe/H] | −0.22 dex |
| Other designations | |
| BD+30°3409, GC 26264, HD 177809, HIP 93720, HR 7238, SAO 67781 | |
| Database references | |
| SIMBAD | data |
HD 177809 is a 6th magnitude star in the constellation Lyra, approximately 664 light years away from Earth. It is a red giant star of the spectral type M3- IIIab<, meaning it possesses a surface temperature of under 4,000 K. In comparison to the Sun, it is much larger and brighter, but its surface is cooler.