Gliese 758

Gliese 758

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]+T8[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]
Distance50.91 ± 0.01 ly
(15.608 ± 0.004 pc)
Absolute magnitude (MV)5.37[5]
Orbit[6]
PrimaryGliese 758 A
CompanionGliese 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
Mass0.93±0.03[6] M☉
Radius0.88[7] R☉
Surface gravity (log g)4.55[7] cgs
Temperature5305[1] K
Metallicity [Fe/H]0.18[3] dex
Age7.7–8.7[8] Gyr
Gliese 758 B
Mass36.387+1.210
−1.081[6] MJup
Temperature600±100[4] K
Other designations
GJ 758, BD+32 3411, HD 182488, HIP 95319, HR 7368, PPM 82821, SAO 68239[9]
Database references
SIMBADA
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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