vB10b, a 6 Jupiter mass giant, was discovered using astrometry in May this year. The planet orbits at roughly the same distance as Mercury does in our Solar System and although being this close to its parent star, it is in fact as cold as Jupiter is. The reason being, vB10 is tiny...weighing in at 0.08 solar masses and has a temp' of 2600K (M8V). It is actually the smallest star discovered to have a planet in orbit. The planet, though less massive, is as large as the star. The system, which is part of the binary Gliese752 lies about 19ly away. vB10 shines at around mag +19.
http://innumerableworlds.wordpress.c...ia-astrometry/