Well, that does seem pretty arbitrary. I used to think a brown dwarf was an object that radiated more than it took in, but I guess not. Thanks, Joe On Friday, October 11, 2013 11:08 PM, "jcarman6@q.com" <jcarman6@q.com> wrote: By arbitrary definition, a brown dwarf's lower limit is 10X the mass of Jupiter.  This star- free planet is less than that, so by definition it is a planet and not a star.  _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options".