2MASS J18352154−3123385
binary Red dwarf system
2MASS J18352154−3123385, often shortened to be 2MASS J1835, is a binary red dwarf system about 56 light-years from the Earth. It was first reported due to its high proper motion in 2010 by J. D. Kirkpatrick et al. It was then independently discovered from its X-ray radiation on June 10, 2015. Further investigation has shown the star to be a binary star with components of spectral type M6.5 and M8. They orbit each other in 1,400-1,800 years, and reached their closest point in mid-1968 assuming a constant proper motion. During their closest approach, they were separated by less than 0.1 arcsecond, compared to their current separation of 2 arcseconds.
Despite the fact that A and B are magnitude 12.5 and 13, respectively, their vicinity to the Earth was not noticed until 2015 due to the fact that it is in front of a relatively dense star field less than 15 degrees away from the Galactic Center.
2MASS J1835A may be a flare star, due to many similar low-mass stars known to flare. It has not been observed to flare directly by 2015, however.
A 19th-magnitude star at 18h 35m 22.76s −31° 23′ 27.7″ has been seen in the vicinity, with a similar proper motion to 2MASS J1835, but is probably not related as its proper motion is not as high as 2MASS J1835.
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