The kinematic of HST-1 in the jet of M 87 M. Giroletti, K. Hada, G. Giovannini, C. Casadio, M. Beilicke, A. Cesarini, C. C. Cheung, A. Doi, H. Krawczynski, M. Kino et al. (2 more) A&A, 538 (2012) L10 Published online: 13 February 2012 DOI: 10.1051/0004-6361/201218794