We report a late M-type , common proper motion companion to a nearby young visual binary HIP 115147 ( V368 Cep ) , separated by 963 arcseconds from the primary K0 dwarf .
This optically dim star has been identified as a candidate high proper motion , nearby dwarf LSPM J2322+7847 by Lépine in 2005 .
The wide companion is one of the latest post-T Tauri low mass stars found within 20 pc .
We obtain a trigonometric parallax of 51.6 \pm 0.8 mas , in good agreement with the Hipparcos parallax of the primary star ( 50.7 \pm 0.6 mas ) .
Our BVRI photometric data and near-infrared data from 2MASS are consistent with LSPM J2322+7847 being brighter by 1 magnitude in K _ { s } than field M dwarfs at V - K _ { s } = 6.66 , which indicates its pre-main sequence status .
We conclude that the most likely age of the primary HIP 115147 and its 11-arcsecond companion HIP 115147B is 20-50 Myr .
The primary appears to be older than its close analog PZ Tel ( age 12-20 Myr ) and members of the TWA association ( 7 Myr ) .