1. Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA
2. LESIA, Observatoire de Paris, PSL University, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, F-92195 Meudon, France
3. Department of Physics, Engineering Physics & Astronomy, Queen’s University, Kingston, ON K7L 3N6, Canada
4. Department of Physics and Space Physics, Royal Military College of Canada, PO Box 17000 Kingston, ON K7K 7B4, Canada
5. Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
6. Nicolaus Copernicus Astronomical Center, Bartycka 18, PL-00-716 Warszawa, Poland
7. Center for Computational Astrophysics, Flatiron Institute, 162 5th Avenue, New York, NY 10010, USA
8. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA
9. Department of Physics and Astronomy, Swarthmore College, Swarthmore, PA 19081, USA
10. Département de Physique et d’Astronomie, Université de Moncton, Moncton, NB E1A 3E9, Canada
11. Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120, Uppsala, Sweden
12. Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, 05508-900 São Paulo, SP, Brazil
13. Physics Department, Mount Allison University, Sackville, NB E4L 1E6, Canada
14. AAVSO Headquarters, 49 Bay State Rd., Cambridge, MA 02138, USA
15. Penn State Scranton, 120 Ridge View Drive, Dunmore, PA 18512, USA