2MASS J04414489+2301513

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2MASS J04414489+2301513
Brown dwarf 2M J044144 and planet.jpg
2MASS J04414489+2301513 is a brown dwarf with a companion about 5–10 times the mass of Jupiter.
Observation data
Epoch J2000      Equinox
Constellation Taurus
Right ascension 04h 41m 44.89s
Declination 23° 01′ 51.3″
Mass 0.02 M
Age Myr
Other designations
Database references

2MASS J04414489+2301513 (often abbreviated to 2M J044144) is a young brown dwarf approximately 450 light years away with an orbiting companion about 5–10 times the mass of Jupiter. The mass of the primary brown dwarf is roughly 20 times the mass of Jupiter and its age is roughly one million years.[1][2]

It is not clear whether this companion object is a sub-brown dwarf or a planet. The companion is very large with respect to its parent brown dwarf, and must have formed within 1 million years or so. This seems to be too big and too fast to form like a regular planet from a disk around the central object.[2]

The 2MASS J04414489+2301513 system
Companion Mass Observed separation
Discovery year
b 7.5 ± 2.5 MJ 15 ± 0.6 2010

See also[edit]


  1. ^ "Hubble spots giant planet orbiting tiny star". Content.usatoday.com. 2010-04-07. Retrieved 2013-02-24. 
  2. ^ a b Todorov, K.; Luhman, K. L.; McLeod, K. K. (2010). "Discovery of a Planetary-Mass Companion to a Brown Dwarf in Taurus". The Astrophysical Journal. 714: L84. arXiv:1004.0539v1Freely accessible. doi:10.1088/2041-8205/714/1/L84.