Electronic Telegram No. 5206 Central Bureau for Astronomical Telegrams Mailing address: Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbatiau@eps.harvard.edu (alternate cbat@iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network GK PERSEI GK Per is undergoing an outburst for the first time since 2018. The following selected visual magnitude estimates were supplied mostly by E. O. Waagen, AAVSO: 2022 Dec. 16.11 UT, 13.2 (B. Cudnik, Houston, TX, USA); 16.762, 12.9 (E. Muyllaert, Oostende, Belgium); 17.359, 12.9 (M. Linnolt, Naalehu, HI, USA); 17.781, 13.0 (G. Poyner, Birmingham, UK); 18.963, 12.4 (J. Manzorro, Chiclana de la Frontera, Spain); 19.791, 12.5 (Muyllaert); 20.806, 12.1 (Poyner); 22.927, 11.8 (Manzorro); 23.774, 11.9 (Muyllaert); 25.084, 11.3 (Cudnik); 26.756, 11.7 (Muyllaert); 28.772, 11.5 (Poyner); 2023 Jan. 2.808, 11.2 (A. Glez-Herrera, Ferrol, Spain); 3.783, 10.8 (J. Ripero, Madrid, Spain); 5.762, 11.2 (E. Fabrigat, Velaux, France); 6.773, 10.9 (Ripero); 10.031, 11.0 (Poyner); 11.79, 11.3 (S. J. O'Meara, Maun, Botswana; 12.746, 10.6 (Fabrigat). O'Meara also reports photovisual magnitude 10.9 on Jan. 12.8. CCD magnitudes from Cudnik (via Waagen): Jan. 6.042, V = 11.39, B = 11.89; 6.986, V = 11.07, B = 11.55; 7.174, V = 11.35; 7.175, B = 11.85; 10.020, B = 11.67; 10.021, V = 11.2; 11.005, V = 10.97; 11.674, B = 11.67. V magnitudes from F. Dubois, Zillebeke, Belgium (via Waagen): 2022 Dec. 26.717, 11.41; 29.800, 11.25; 2023 Jan. 2.723, 11.30; 4.804, 11.28; 8.724, 11.26; 9.812, 11.22. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2023 CBAT 2023 January 14 (CBET 5206) Daniel W. E. Green