From Wikipedia, the free encyclopedia
Star in the constellation Lyra
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 .
Properties
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]
Companion
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]
See also
References
^
a
b
c
d
e
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S2CID
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Gaia DR3 record for this source at
VizieR .
^
a
b
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^
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^
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The Astrophysical Journal Supplement Series . 262 (21): 21.
arXiv :
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doi :
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S2CID
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^
a
b
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S2CID
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^
a
b Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008), "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics", The Astrophysical Journal , 687 (2): 1264–1293,
arXiv :
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S2CID
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^
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Centre de données astronomiques de Strasbourg . Retrieved 2009-12-13 .
^ Thalmann, C.; et al. (2009), "Discovery of the Coldest Imaged Companion of a Sun-Like Star", The Astrophysical Journal Letters , 707 (2): L123–L127,
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^
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^ Janson, M.; Carson, J.; Thalmann, C.; McElwain, M. W.; Goto, M.; Crepp, J.; Wisniewski, J.; Abe, L.; Brandner, W.; Burrows, Adam; Egner, S.; Feldt, M.; Grady, C. A.; Golota, T.; Guyon, Olivier; Hashimoto, J.; Hayano, Y.; Hayashi, M.; Hayashi, S.; Henning, T.; Hodapp, K. W.; Ishii, M.; Iye, M.; Kandori, R.; Knapp, G. R.; Kudo, T.; Kusakabe, N.; Kuzuhara, M.; Matsuo, T.; Mayama, S.; Miyama, S.; Morino, J.-I.; Moro-Martín, A.; Nishimura, T.; Pyo, T.-S.; Serabyn, E.; Suto, H.; Suzuki, R.; Takami, M.; Takato, N.; Terada, H.; Tofflemire, B.; Tomono, D.; Turner, E. L.; Watanabe, M.; Yamada, T.; Takami, H.; Usuda, T.; Tamura, M. (2011), "Near-infrared Multi-band Photometry of the Substellar Companion GJ 758 B", The Astrophysical Journal , 728 (2): 85,
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External links