Apollo asteroid 2005 UD: split nucleus of (3200) Phaethon? K. Ohtsuka, T. Sekiguchi, D. Kinoshita, J.-I. Watanabe, T. Ito, H. Arakida and T. Kasuga A&A, 450 3 (2006) L25-L28 Published online: 19 April 2006 DOI: 10.1051/0004-6361:200600022