Mid-infrared evolution of η Carinae from 1968 to 2018 A. Mehner, W.-J. de Wit, D. Asmus, P. W. Morris, C. Agliozzo, M. J. Barlow, T. R. Gull, D. J. Hillier and G. Weigelt A&A, 630 (2019) L6 Published online: 30 September 2019 DOI: 10.1051/0004-6361/201936277