We report the discovery of a nearby star with a very large proper motion of 5.06 \pm 0.03 arcsec/yr .
The star is called SO025300.5+165258 and referred to herein as HPMS ( high proper motion star ) .
The discovery came as a result of a search of the SkyMorph database , a sensitive and persistent survey that is well suited for finding stars with high proper motions .
There are currently only 7 known stars with proper motions > 5 arcsec/yr .
We have determined a preliminary value for the parallax of \pi = 0.43 \pm 0.13 arcsec .
If this value holds our new star ranks behind only the Alpha Centauri system ( including Proxima Centauri ) and Barnard ’ s star in the list of our nearest stellar neighbors .
The spectrum and measured tangential velocity indicate that HPMS is a main-sequence star with spectral type M6.5 .
However , if our distance measurement is correct , the HPMS is underluminous by 1.2 \pm 0.7 mag .