Gliese 758 B

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GJ 758 B
Extrasolar planet List of extrasolar planets
GJ 758 System - Labeled.jpg
Discovery image of GJ 758 B, taken with Subaru HiCIAO in the near infrared.
Parent star
Star GJ 758
Constellation Lyra
Right ascension (α) 19h 23m 34.0s
Declination (δ) +33° 13′ 19.1″
Apparent magnitude (mV) 6.36
Distance 50.55 ly
(15.5 pc)
Spectral type G9V
Orbital elements
Semimajor axis (a) 41.8+37.3
[1] AU
Eccentricity (e) 0.464+0.206
Orbital period (P) 270+433
[1] y
Physical characteristics
Mass (m) ~30–40[1] MJ
Temperature (T) 593+44
Discovery information
Discovery date November 9, 2009
Discoverer(s) Thalmann, et al.
Discovery method Direct imaging
Discovery status Published
Database references
Extrasolar Planets

GJ 758 B is a brown dwarf orbiting the G-type main sequence star GJ 758, located approximately 50 light years away, in the constellation Lyra.

GJ 758 B was detected by direct imaging using the HiCIAO instrument of the Subaru Telescope.[2][3][4] The parameters have subsequently been revised in a follow-up study which also revealed that a putative second substellar object in the system was in fact an unrelated background star.[1]


  1. ^ a b c d e Janson, M.; Carson, J.; Thalmann, C.; McElwain, M. W.; Goto, M.; Crepp, J.; Wisniewski, J.; Abe, L.; Brandner, W.; Burrows, A.; Egner, S.; Feldt, M.; Grady, C. A.; Golota, T.; Guyon, O.; 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). arXiv:1011.5505. Bibcode:2011ApJ...728...85J. doi:10.1088/0004-637X/728/2/85. 
  2. ^ Thalmann, Christian (2009). "Discovery of the Coldest Imaged Companion of a Sun-Like Star". arXiv:0911.1127v1 [astro-ph.EP].
  3. ^ "Possible Planet Around a G-class Star". Centauri Dreams. 2009-12-04. Retrieved 2009-12-04. 
  4. ^ "Discovery of an Exoplanet Candidate Orbiting a Sun-Like Star: Inaugural Observations with Subaru's New Instrument HiCIAO". Subaru Telescope. 2009-12-03. Retrieved 2009-12-04. 

External links[edit]

Animation of GJ 758 B's orbit compared to outer Solar System

Coordinates: Sky map 19h 23m 34.0s, +33° 13′ 19.1″