BD+29 5007 is a K-type star, located 77 light-years in the constellation Pegasus. It has a large-separation companion that was identified in 2016. The pair was identified to be a possible member of the million years old Argus association (see IC 2391), though this is disputed.
The star has a mass of, a radius of and a temperature of Kelvin. It has a spectral type of K5V.
The companion is 2MASS J23512200+3010540 (short: 2MASS J2351+3010) that was discovered in 2010 and first identified as a possibly young low-mass object in 2014 by the BANYAN II survey. The authors find a L5.5 dwarf with red near-infrared colors. If it is a member of Argus, it should have a mass of 9−11, according to the authors. However, the BANYAN VII survey in 2015 revised the status of 2MASS J2351+3010 to a field object, i.e. not a member of any stellar cluster or association. This is also suggested by measured surface gravity of 2MASS J2351+3010, consistent with that of a field object. This would mean that the companion is too massive to have a planetary mass (i.e. its mass is larger than).
In 2016 it was identified as a possible companion to BD+29 5007. In 2024 it was again identified as an Argus member with a mass of . The same authors calculate that this system has a probability of 1.71% to be a false-positive match. The companion is separated by 935 arcseconds, which translates into 22,100 astronomical units at this distance. This high separation is larger than the 12,000 AU projected separation of Gliese 900 b, currently the planetary-mass object with the longest known orbit, and is similar to brown dwarfs such as UCAC4 328-061594.