 Discovery image of Gliese 758 B, taken with Subaru HiCIAO in the near infrared | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 23m 34.013166s[1] |
| Declination | +33° 13′ 19.078368″[1] |
| Apparent magnitude (V) | 6.36[2] |
| Characteristics | |
| Spectral type | G8V[3]+T7[4] |
| U−B color index | +0.455[2] |
| B−V color index | +0.799[2] |
| Astrometry | |
| Radial velocity (Rv) | −21.62±0.12[1] km/s |
| Proper motion (μ) | RA: 81.966±0.013 mas/yr[1] Dec.: 160.158±0.016 mas/yr[1] |
| Parallax (π) | 64.0703 ± 0.0154 mas[1] |
| Distance | 50.91 ± 0.01 ly (15.608 ± 0.004 pc) |
| Absolute magnitude (MV) | 5.37[5] |
| Orbit[6] | |
| Primary | Gliese 758 A |
| Companion | Gliese 758 B |
| Period (P) | 131.276+15.078 −12.080 yr |
| Semi-major axis (a) | 25.409+1.944 −1.626 AU |
| Eccentricity (e) | 0.365+0.079 −0.082 |
| Inclination (i) | 38.080+5.438 −4.808° |
| Longitude of the node (Ω) | 349.680+5.776 −6.263° |
| Periastron epoch (T) | 2,421,289.845+3,708.120 −4,680.545 |
| Argument of periastron (ω) (secondary) | 175.102+11.951 −14.709° |
| Semi-amplitude (K1) (primary) | 0.139318+0.009603 −0.008036 km/s |
| Details | |
| Gliese 758 A | |
| Mass | 0.93±0.03[6] M☉ |
| Radius | 0.88[7] R☉ |
| Surface gravity (log g) | 4.55[7] cgs |
| Temperature | 5305[1] K |
| Metallicity [Fe/H] | 0.18[3] dex |
| Age | 7.7–8.7[8] Gyr |
| Gliese 758 B | |
| Mass | 36.387+1.210 −1.081[6] MJup |
| Surface gravity (log g) | 4.3 ±0.5[4] cgs |
| Temperature | 741 ±25[4] K |
| Other designations | |
| Database references | |
| SIMBAD | A |
| B | |
Gliese 758 is a star in the northern constellation of Lyra. At about magnitude 6 it is a challenge to view with the naked eye even in good seeing conditions, but can be easily seen through a small telescope or binoculars. Parallax measurements from the Hipparcos mission give it an estimated distance of around 50.9 light-years (15.6 parsecs) from Earth.
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