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] |
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 |
Temperature | 600±100 [4] K |
Other designations | |
Database references | |
SIMBAD | A |
B | |
Extrasolar Planets Encyclopaedia | data |
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.
This is a Sun-like star with 97% of the Sun's mass and 88% of the radius of the Sun. The spectrum matches a stellar classification of G8V, [3] identifying it as a G-type main-sequence star that is generating energy through the nuclear fusion of hydrogen at its core. It is radiating this energy into space from its outer envelope at an effective temperature of 5,425 K. [3] Estimates of its age put it at about 7.7–8.7 billion years old, [8] although some measurements give it an age as low as 720 million years. [7] The abundance of elements other than hydrogen and helium, what astronomers term the star's metallicity, are 51% higher than in the Sun. [3]
In November 2009, a team using the HiCIAO instrument of the Subaru Telescope imaged a substellar companion orbiting the star. This brown dwarf, designated Gliese 758 B, was estimated to be of approximately 10 to 40 Jupiter masses. A second candidate object was also detected, which was given the designation Gliese 758 C. [10] [11] [12] Follow-up studies of the system refined the mass range of Gliese 758 B, indicating it to be a companion with approximately 30 to 40 Jupiter masses, and revealed that Gliese 758 C is a background star which is not physically associated with the Gliese 758 system. [13] On the other hand, a younger age was suggested from the kinematic stellar grouping.
The most recent parameters for Gliese 758 B as of 2022 come from a combination of data from radial velocity, astrometry, and imaging, [14] [15] [6] showing that it is about 36 times the mass of Jupiter, and on an eccentric orbit with a semi-major axis of about 25.4 astronomical units and an orbital period of about 131 years. [6]
Gliese 570 is a quaternary star system approximately 19 light-years away. The primary star is an orange dwarf star. The other secondary stars are themselves a binary system, two red dwarfs that orbit the primary star. A brown dwarf has been confirmed to be orbiting in the system. In 1998, an extrasolar planet was thought to orbit the primary star, but it was discounted in 2000.
Gliese 229 is a binary system composed of a red dwarf and the first brown dwarf seen by astronomers, 18.8 light years away in the constellation Lepus. The primary component has 58% of the mass of the Sun, 69% of the Sun's radius, and a very low projected rotation velocity of 1 km/s at the stellar equator.
Gliese 674(GJ 674) is a small red dwarf star with an exoplanetary companion in the southern constellation of Ara. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 9.38 and an absolute magnitude of 11.09. The system is located at a distance of 14.8 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −2.9 km/s. It is a candidate member of the 200 million year old Castor stream of co-moving stars.
HD 28185 is a yellow dwarf star similar to the Sun located 128 light-years away from Earth in the constellation Eridanus. The designation HD 28185 refers to its entry in the Henry Draper catalogue. The star is known to possess one long-period extrasolar planet.
Gliese 105 is a triple star system in the constellation of Cetus. It is located relatively near the Sun at a distance of 23.6 light-years. Despite this, even the brightest component is barely visible with the unaided eye (see Bortle scale). No planets have yet been detected around any of the stars in this system.
Pi Mensae, also known as HD 39091, is a yellow dwarf star in the constellation of Mensa. This star has a high proper motion. The apparent magnitude is 5.67, which can be visible to the naked eye in exceptionally dark, clear skies. It is nearly 60 light-years away. The star is slightly larger than the Sun in terms of mass, size, luminosity, temperature and metallicity, and is about 730 million years younger. It hosts three known planets.
Gliese 849, or GJ 849, is a small, solitary star in the equatorial constellation of Aquarius. It has a reddish hue and is invisible to the naked eye with an apparent visual magnitude of 10.41. The distance to this star is 28.8 light-years based on parallax, but it is drifting closer to the Sun with a radial velocity of −15.3 km/s. It has a pair of confirmed gas giant companions.
Gliese 86 is a K-type main-sequence star approximately 35 light-years away in the constellation of Eridanus. It has been confirmed that a white dwarf orbits the primary star. In 1998 the European Southern Observatory announced that an extrasolar planet was orbiting the star.
HD 115404 is a binary star system located in the constellation Coma Berenices. Parallax measurements made by Hipparcos put the system at 36 light-years, or 11 parsecs, away. The combined apparent magnitude of the system is 6.52, with the magnitudes of the components being 6.66 and 9.50.
36 Ursae Majoris is a double star in the northern constellation of Ursa Major. With an apparent visual magnitude of 4.8, it can be seen with the naked eye in suitable dark skies. Based upon parallax measurements, this binary lies at a distance of 42 light-years from Earth.
Gliese 433 is a dim red dwarf star with multiple exoplanetary companions, located in the equatorial constellation of Hydra. The system is located at a distance of 29.6 light-years from the Sun based on parallax measurements, and it is receding with a radial velocity of +18 km/s. Based on its motion through space, this is an old disk star. It is too faint to be viewed with the naked eye, having an apparent visual magnitude of 9.81 and an absolute magnitude of 10.07.
Gliese 806 is a star in the northern constellation of Cygnus, located about a degree to the southeast of the bright star Deneb. It is invisible to the naked eye with an apparent visual magnitude of +10.79. The star is located at a distance of 39.3 light years from the Sun based on stellar parallax. It is drifting closer with a radial velocity of −24.6 km/s, and is predicted to come to within 30.1 light-years in ~198,600 years. The star hosts two known planetary companions.
Gliese 521 is a double star in the northern constellation of Canes Venatici. The system is located at a distance of 43.6 light-years from the Sun based on parallax measurements, but is drawing closer with a radial velocity of −65.6 km/s. It is predicted to come as close as 15.70 light-years from the Sun in 176,900 years. This star is too faint to be visible to the naked eye, having an apparent visual magnitude of +10.26 and an absolute magnitude of 10.24.
Gliese 163 is a faint red dwarf star with multiple exoplanetary companions in the southern constellation of Dorado. Other stellar catalog names for it include HIP 19394 and LHS 188. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 11.79 and an absolute magnitude of 10.91. This system is located at a distance of 49.4 light-years from the Sun based on parallax measurements. Judging by its space velocity components, it is most likely a thick disk star.
Gliese 754 is a dim star in the southern constellation of Telescopium. It has an apparent visual magnitude of 12.25, which requires a telescope to view. The star is located at a distance of 19.3 light-years from the Sun based on parallax, and it is drifting further away with a radial velocity of +7 km/s. It is one of the hundred closest stars to the Solar System. Calculations of its orbit around the Milky Way showed that it is eccentric, and indicate that it might be a thick disk object.
Gliese 880 is a red dwarf star in the northern constellation of Pegasus that may host an exoplanetary companion. No stellar companions to Gliese 880 have been discovered as of 2020.
Gliese 569 is a ternary star system composed of a main-sequence star orbited by a pair of brown dwarfs in the constellation of Boötes about 32 light years away.
Gliese 514, also known as BD+11 2576 or HIP 65859, is a M-type main-sequence star, in the constellation Virgo 24.85 light-years away from the Sun. The proximity of Gliese 514 to the Sun was known exactly since 1988.