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 |
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.