The astrometric Gaia-FUN-SSO observation campaign of 99942 Apophis W. Thuillot, D. Bancelin, A. Ivantsov, J. Desmars, M. Assafin, S. Eggl, D. Hestroffer, P. Rocher, B. Carry, P. David et al. (64 more) A&A, 583 (2015) A59 Published online: 28 October 2015 DOI: 10.1051/0004-6361/201425603