If that wasn’t enough, the spooky skull-shaped asteroid that passed by on Halloween is coming back round for another pass on Sunday.
Had me worried for a minute until I saw it was Halloween
2015.
An earth crossing asteroid with a period of 9 days would have been unusual.
An earth crossing asteroid with a period of 9 days would be in orbit -- around the earth, possibly in an earth - moon orbit (not sure about the physics of that one!)
I do not know how big an Earth orbiting rock or chunk of ice has to be to be called a "moon".