Long-term spot monitoring of the young solar analogue V889 Herculis T. Willamo, T. Hackman, J. J. Lehtinen, M. J. Käpylä, I. Ilyin, G. W. Henry, L. Jetsu, O. Kochukhov and N. Piskunov A&A, 622 (2019) A170 Published online: 15 February 2019 DOI: 10.1051/0004-6361/201834562