Gliese 777
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| A | |
| Right ascension | 20h 03m 37.405s |
| Declination | +29° 53′ 48.49″ |
| Apparent magnitude (V) | +5.73 |
| B | |
| Right ascension | 20h 03m 26.581s |
| Declination | +29° 51′ 59.53″ |
| Apparent magnitude (V) | +14.4 |
| Characteristics | |
| A | |
| Evolutionary stage | main sequence |
| Spectral type | G6IV |
| B | |
| Evolutionary stage | main sequence |
| Spectral type | M4.5V |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −45.34±0.12 km/s |
| Proper motion (μ) | RA: +683.196 mas/yr Dec.: −525.501 mas/yr |
| Parallax (π) | 62.4865±0.34 mas |
| Distance | 52.2 ± 0.3 ly (16.00 ± 0.09 pc) |
| Absolute magnitude (MV) | +4.73 |
| B | |
| Radial velocity (Rv) | −44.02±0.40 km/s |
| Proper motion (μ) | RA: +681.116 mas/yr Dec.: −525.863 mas/yr |
| Parallax (π) | 62.5269±0.0225 mas |
| Distance | 52.16 ± 0.02 ly (15.993 ± 0.006 pc) |
| Absolute magnitude (MV) | +13.3 |
| Details | |
| A | |
| Mass | 0.991+0.039 −0.040 M☉ |
| Radius | 1.142±0.009 R☉ |
| Luminosity | 1.114±0.007 L☉ |
| Surface gravity (log g) | 4.292±0.012 cgs |
| Temperature | 5,557±22 K |
| Metallicity [Fe/H] | 0.17±0.04 dex |
| Rotation | 40 days |
| Rotational velocity (v sin i) | 2.8 km/s |
| Age | 4.79 Gyr |
| B | |
| Mass | 0.21 M☉ |
| Radius | 0.24 R☉ |
| Luminosity | 0.0044 L☉ |
| Surface gravity (log g) | 4.84 cgs |
| Temperature | 3.169 K |
| Metallicity [Fe/H] | 0.06 dex |
| Rotational velocity (v sin i) | 7.1 km/s |
| Age | 2.5 Gyr |
| Other designations | |
| GJ 777 | |
| A: BD+29°3872, HD 190360, HIP 98767, HR 7670, LHS 3510 | |
| B: G 125-55, LHS 3509 | |
| Database references | |
| SIMBAD | A |
| B | |
| Exoplanet Archive | data |
| ARICNS | data |
| data2 | |
Gliese 777, also known as HD 190360, is a binary star system approximately 52 light-years away in the constellation of Cygnus. The system is made up of two stars and possibly a third. Three exoplanets are known to orbit the primary star.