HD 177830
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 05m 20.7732s |
| Declination | +25° 55′ 14.373″ |
| Apparent magnitude (V) | 7.175 |
| Characteristics | |
| A | |
| Evolutionary stage | subgiant or giant |
| Spectral type | K2IV |
| B | |
| Evolutionary stage | main sequence |
| Spectral type | M4V |
| Astrometry | |
| Radial velocity (Rv) | −71.86±0.06 km/s |
| Proper motion (μ) | RA: −41.248(12) mas/yr Dec.: −52.580(17) mas/yr |
| Parallax (π) | 16.0063±0.0165 mas |
| Distance | 203.8 ± 0.2 ly (62.48 ± 0.06 pc) |
| Absolute magnitude (MV) | +3.33 |
| Orbit | |
| Period (P) | ~800 yr |
| Semi-major axis (a) | 97 au |
| Details | |
| A | |
| Mass | 1.48 M☉ |
| Radius | 3.6 R☉ |
| Luminosity | 6.3 L☉ |
| Surface gravity (log g) | 3.43 cgs |
| Temperature | 4,824 K |
| Metallicity [Fe/H] | 0.31 dex |
| Rotational velocity (v sin i) | 2.54 km/s |
| Age | 4.4±2.2 Gyr |
| B | |
| Mass | 0.23 M☉ |
| Other designations | |
| BD+25°3719, Gliese 743.2, HIP 93746, GSC 02126-01196, SAO 86791 | |
| Database references | |
| SIMBAD | data |
HD 177830 is a 7th magnitude binary star system located approximately 205 light-years away in the constellation of Lyra. The primary star is slightly more massive than the Sun, but cooler being a type K star. It has evolved away from the main sequence and expanded to 3.6 times the radius of the Sun. In visual light it is over six times brighter than the Sun, but because of its distance, about 204 light years, it is not visible to the unaided eye. With binoculars it is be easily visible.
The primary star is known to have two extrasolar planets orbiting around it.