Spitzer Space Telescope observations of bilobate comet 8P/Tuttle O. Groussin, P. L. Lamy, M. S. P. Kelley, I. Toth, L. Jorda, Y. R. Fernández and H. A. Weaver A&A, 632 (2019) A104 Published online: 11 December 2019 DOI: 10.1051/0004-6361/201936458