(121514) 1999 UJ7: A primitive, slow-rotating Martian Trojan G. Borisov, A. A. Christou, F. Colas, S. Bagnulo, A. Cellino and A. Dell’Oro A&A, 618 (2018) A178 Published online: 24 October 2018 DOI: 10.1051/0004-6361/201732466