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tokens: ACKNOWLEDGEMENTS The authors HB, DB, MM, AK, SBP, and PW acknowledges support through the National Research Foundation of South Africa. AK acknowledges the Russian Science Foundation (project no. 14-50-00043). VL and EG acknowledges support of the Development Program of M.V. Lomonosov Moscow State University and the Russian Science Foundation 16-12-00085. MASTER-SAAO is supported by the Russian Foundation for Basic Research (RFBR) 17-52-80133. Some observations reported in this paper were obtained with the South African Large Telescope under programme 2014-2-DDT-002. We thank Prof. Jules Halpern of Columbia University, who kindly obtained a short time series in 2017 March from MDM. We also thank the students of the 2015 Dartmouth Astronomy Foreign Study Program for assistance at the telescope; they are MacKenzie Carlson, Z. Edrei Chua, Robert Cueva, Natalie Drozdoff, John French, Emma Garcia, Zoe Guttendorf, Rachel McKee, Krystyna Miles, Jack Neustadt, Samuel Rosen, Marie Schwalbe, and Nicholas Suntzeff, and graduate assistants Erek Alper and MacKenzie Jones. Finally, we thank the anonymous referee, whose comments and suggestions have lead to greater understanding, and significantly improved the quality of this work.