This is planet "HD 106906 B" and it was found in the farthest orbit of a sun yet discovered. Probably because of a combination of it's appearance as well as the 50th anniversary and the revelation that Gallifrey is out there, not surprisingly there is a petition to have the planet named Gallifrey. I don't normally go for petitions, but I signed this one, and I hope enough people do to have it named, as it would be a fitting tribute for the show, as well as a wonderful 50th birthday gift. They are still a number of people away from their goal of signatures, so please go here and sign the petition today.
Here is a Youtube video from the person who started the petition.
We might not get a more perfect opportunity to immortalize Doctor Who in our reality's stars.