Bd+20 2457 B (Paperback)

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. BD]20 2457 b is a brown dwarf located between 320 to 980 light years away in the constellation of Leo, orbiting the 10th magnitude K-type bright giant star BD+20 2457. It has mass 21.42 times more massive than Jupiter and the orbit takes 4% longer than Earth's to go around the star. The other companion in this system BD+20 2457 c, is a very massive planet (massing at least 12.47 times greater than Jupiter), meaning it is likely that the other companion may also be a brown dwarf. This brown dwarf was discovered on June 10, 2009, using the Hobby-Eberly Telescope.