small short-period comet
period of 5.4 years. It was the original target for close investigation by the orbital with a current comet46P/Wirtanen is a small short-period Rosetta spacecraft, planned by the European Space Agency, but an inability to meet the launch window caused Rosetta to be sent to 67P/Churyumov–Gerasimenko instead. It belongs to the Jupiter family of comets, all of which have aphelia between 5 and 6 AU. Its diameter is estimated at 1.2 kilometers (0.75 mi).