re: Here's an artist's depiction. -Thanks, Phil!
But, honestly, I miss the images that were done with brushes and paint. :}
Space.com movie of Gl581 system: http://www.space.com/php/video/player.php?video_id=070424_HabitableZone
Orbits animation from Solstation.com. Of course, you can get most the info here.
It could be possible that 'c' does rotate, but very slowly.
