2MASS J2126-8140

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2MASS J21265040−8140293
Exoplanet List of exoplanets
Parent star
Star TYC 9486-927-1
Constellation Octans
Right ascension (α)  21h 25m 28.0s[1]
Declination (δ) −81° 38′ 28″[1]
Mass (m) 0.4[1] M
Age 0.027 (± 0.017)[1] Gyr
Physical characteristics
Mass(m)13.3 (± 1.7) [1] MJ
Temperature (T) ~1,800 K (1,530 °C; 2,780 °F)[1]
Orbital elements
Semi-major axis(a) 6,900.0[1] AU
Discovery information
Discovery date 2009 (as a Brown Dwarf), 2016 (as an exoplanet)[1]
Discoverer(s) K. L. Cruz, J. D. Kirkpatrick, A. J. Burgasser [1][2][3]
Discovery method Direct imaging
Discovery status Confirmed

2MASS J21265040−8140293, also known as 2MASS J2126−8140,[3] is an exoplanet[3] orbiting the red dwarf star TYC 9486-927-1 (2MASS J21252752-8138278), 24.75 (± 4.25) parsecs away. It has both the longest (~900 thousand years) and the widest orbit for a planetary mass object known (>4,500AU). Its estimated mass, age, spectral type, and Teff are similar to the well-studied planet β Pictoris b.[3]

Due to its extremely far distance to the star, it is highly likely to not be tidally locked.


  1. ^ a b c d e f g h i "Planet 2MASS J2126-8140". exoplanet.eu. Retrieved 2016-01-27.[permanent dead link]
  2. ^ Cruz, K.L.; Kirkpatrick, J.D.; Murphy, S. (2009). "Young L Dwarfs Identified in the Field: A Preliminary Low-Gravity, Optical Spectral Sequence from L0 to L5". Astron. J. 137 (2): 3445. arXiv:0812.0364. Bibcode:2009AJ....137.3345C. doi:10.1088/0004-6256/137/2/3345.
  3. ^ a b c d N. Deacon; J. Schleider; S. Murphy (2016). "A nearby young M dwarf with a wide, possibly planetary-mass companion". Monthly Notices of the Royal Astronomical Society. 457 (3): 3191. arXiv:1601.06162. Bibcode:2016MNRAS.457.3191D. doi:10.1093/mnras/stw172.