Spitzer observations of spacecraft target 162173 (1999 JU3) H. Campins, J. P. Emery, M. Kelley, Y. Fernández, J. Licandro, M. Delbó, A. Barucci and E. Dotto A&A, 503 2 (2009) L17-L20 Published online: 27 July 2009 DOI: 10.1051/0004-6361/200912374