My CCD observations of GK Per in October-Decameber 2021, remotely using 0.61-m f/6.5 corrected Dall-Kirkham telescope of Burke-Gaffney Observatory (Canada):

PERGK 20211228.29213 13.948B RFD 0.056 PERGK 20211228.29117 13.042V RFD 0.015 PERGK 20211228.29023 11.604I RFD 0.021 PERGK 20211228.28942 12.281R RFD 0.009 PERGK 20211228.28861 14.003B RFD 0.036 PERGK 20211228.28765 13.064V RFD 0.010 PERGK 20211228.28670 11.622I RFD 0.012 PERGK 20211228.28590 12.300R RFD 0.006 PERGK 20211228.28509 14.042B RFD 0.026 PERGK 20211228.28413 13.060V RFD 0.005 PERGK 20211224.19421 13.947B RFD 0.017 PERGK 20211224.19325 13.017V RFD 0.005 PERGK 20211224.19232 11.583I RFD 0.009 PERGK 20211224.19152 12.262R RFD 0.003 PERGK 20211224.19069 13.906B RFD 0.020 PERGK 20211224.18973 13.018V RFD 0.005 PERGK 20211224.18880 11.607I RFD 0.007 PERGK 20211224.18800 12.258R RFD 0.003 PERGK 20211224.18718 13.936B RFD 0.017 PERGK 20211224.18622 13.042V RFD 0.005 PERGK 20211222.04469 13.962B RFD 0.016 PERGK 20211222.04374 13.108V RFD 0.005 PERGK 20211222.04280 11.665I RFD 0.008 PERGK 20211222.04200 12.360R RFD 0.004 PERGK 20211222.04118 14.029B RFD 0.020 PERGK 20211222.04022 13.102V RFD 0.005 PERGK 20211222.03928 11.656I RFD 0.007 PERGK 20211222.03848 12.322R RFD 0.004 PERGK 20211222.03766 13.989B RFD 0.018 PERGK 20211222.03671 13.076V RFD 0.005

PERGK 20211118.07089 11.673I RFD 0.020 PERGK 20211118.07009 12.411R RFD 0.008 PERGK 20211118.06927 14.137B RFD 0.027 PERGK 20211118.06831 13.158V RFD 0.006 PERGK 20211118.06737 11.672I RFD 0.009 PERGK 20211118.06657 12.386R RFD 0.004 PERGK 20211118.06575 14.086B RFD 0.026 PERGK 20211118.06479 13.160V RFD 0.006 PERGK 20211115.24458 13.811B RFD 0.015 PERGK 20211115.24362 12.949V RFD 0.006 PERGK 20211115.24268 11.547I RFD 0.008 PERGK 20211115.24187 12.209R RFD 0.004 PERGK 20211115.24107 13.831B RFD 0.019 PERGK 20211115.24010 12.965V RFD 0.004 PERGK 20211115.23917 11.522I RFD 0.009 PERGK 20211115.23837 12.192R RFD 0.003 PERGK 20211115.23755 13.821B RFD 0.015 PERGK 20211115.23659 12.954V RFD 0.004 PERGK 20211112.03169 14.051B RFD 0.015 PERGK 20211112.03073 13.168V RFD 0.005 PERGK 20211112.02978 11.699I RFD 0.008 PERGK 20211112.02898 12.407R RFD 0.004 PERGK 20211112.02816 14.102B RFD 0.018 PERGK 20211112.02720 13.140V RFD 0.004 PERGK 20211112.02626 11.716I RFD 0.007 PERGK 20211112.02546 12.390R RFD 0.003 PERGK 20211112.02464 14.050B RFD 0.017 PERGK 20211112.02368 13.140V RFD 0.005 PERGK 20211109.02392 14.079B RFD 0.019 PERGK 20211109.02296 13.113V RFD 0.005 PERGK 20211109.02202 11.640I RFD 0.007 PERGK 20211109.02123 12.350R RFD 0.004 PERGK 20211109.02042 14.088B RFD 0.018 PERGK 20211109.01946 13.097V RFD 0.007 PERGK 20211109.01852 11.638I RFD 0.008 PERGK 20211109.01772 12.333R RFD 0.004 PERGK 20211109.01690 14.075B RFD 0.019 PERGK 20211109.01594 13.116V RFD 0.006 PERGK 20211107.02351 13.875B RFD 0.014 PERGK 20211107.02255 12.998V RFD 0.005 PERGK 20211107.02161 11.554I RFD 0.006 PERGK 20211107.02081 12.251R RFD 0.004 PERGK 20211107.02000 13.924B RFD 0.019 PERGK 20211107.01904 13.009V RFD 0.006 PERGK 20211107.01810 11.552I RFD 0.007 PERGK 20211107.01730 12.242R RFD 0.005 PERGK 20211107.01648 13.904B RFD 0.023 PERGK 20211107.01552 13.001V RFD 0.005 PERGK 20211105.94961 13.888B RFD 0.020 PERGK 20211105.94865 13.030V RFD 0.005 PERGK 20211105.94771 11.581I RFD 0.008 PERGK 20211105.94691 12.262R RFD 0.004 PERGK 20211105.94609 13.890B RFD 0.019 PERGK 20211105.94513 13.008V RFD 0.007 PERGK 20211105.94419 11.591I RFD 0.008 PERGK 20211105.94338 12.273R RFD 0.004 PERGK 20211105.94256 13.885B RFD 0.021 PERGK 20211105.94160 13.023V RFD 0.006 PERGK 20211102.30894 13.788B RFD 0.014 PERGK 20211102.30799 12.884V RFD 0.004 PERGK 20211102.30704 11.495I RFD 0.005 PERGK 20211102.30624 12.151R RFD 0.003 PERGK 20211102.30543 13.725B RFD 0.010 PERGK 20211102.30447 12.893V RFD 0.003 PERGK 20211102.30352 11.499I RFD 0.007 PERGK 20211102.30273 12.150R RFD 0.003 PERGK 20211102.30191 13.755B RFD 0.011 PERGK 20211102.30095 12.859V RFD 0.004

PERGK 20211030.28234 13.681B RFD 0.017 PERGK 20211030.28139 12.849V RFD 0.004 PERGK 20211030.28044 11.462I RFD 0.008 PERGK 20211030.27964 12.115R RFD 0.004 PERGK 20211030.27883 13.734B RFD 0.026 PERGK 20211030.27786 12.854V RFD 0.009 PERGK 20211030.27692 11.496I RFD 0.010 PERGK 20211030.27612 12.150R RFD 0.005 PERGK 20211030.27531 13.724B RFD 0.023 PERGK 20211030.27434 12.905V RFD 0.009 PERGK 20211025.10814 13.848B RFD 0.015 PERGK 20211025.10718 12.976V RFD 0.004 PERGK 20211025.10624 11.544I RFD 0.010 PERGK 20211025.10543 12.235R RFD 0.003 PERGK 20211025.10462 13.852B RFD 0.013 PERGK 20211025.10365 12.995V RFD 0.004 PERGK 20211025.10271 11.543I RFD 0.008 PERGK 20211025.10191 12.221R RFD 0.004 PERGK 20211025.10109 13.806B RFD 0.017 PERGK 20211025.10013 12.985V RFD 0.005 PERGK 20211021.05131 13.921B RFD 0.026 PERGK 20211021.05035 13.029V RFD 0.007 PERGK 20211021.04941 11.558I RFD 0.009 PERGK 20211021.04861 12.245R RFD 0.003 PERGK 20211021.04779 13.812B RFD 0.027 PERGK 20211021.04684 12.989V RFD 0.006 PERGK 20211021.04589 11.559I RFD 0.009 PERGK 20211021.04509 12.233R RFD 0.004 PERGK 20211021.04427 13.840B RFD 0.023 PERGK 20211021.04331 12.946V RFD 0.009 PERGK 20211019.11514 13.688B RFD 0.018 PERGK 20211019.11418 12.822V RFD 0.004 PERGK 20211019.11324 11.450I RFD 0.006 PERGK 20211019.11244 12.132R RFD 0.004 PERGK 20211019.11162 13.690B RFD 0.021 PERGK 20211019.11066 12.852V RFD 0.005 PERGK 20211019.10972 11.490I RFD 0.011 PERGK 20211019.10892 12.186R RFD 0.003 PERGK 20211019.10810 13.797B RFD 0.018 PERGK 20211019.10714 12.903V RFD 0.005 PERGK 20211016.13413 13.541B RFD 0.025 PERGK 20211016.13317 12.754V RFD 0.007 PERGK 20211016.13223 11.380I RFD 0.007 PERGK 20211016.13143 12.025R RFD 0.003 PERGK 20211016.13061 13.612B RFD 0.020 PERGK 20211016.12965 12.736V RFD 0.004 PERGK 20211016.12872 11.332I RFD 0.006 PERGK 20211016.12792 11.968R RFD 0.003 PERGK 20211016.12709 13.438B RFD 0.013 PERGK 20211016.12613 12.675V RFD 0.003 PERGK 20211013.03495 13.937B RFD 0.024 PERGK 20211013.03400 13.022V RFD 0.006 PERGK 20211013.03307 11.584I RFD 0.010 PERGK 20211013.03226 12.282R RFD 0.006 PERGK 20211013.03145 13.883B RFD 0.023 PERGK 20211013.03049 13.035V RFD 0.009 PERGK 20211013.02955 11.597I RFD 0.010 PERGK 20211013.02875 12.276R RFD 0.004 PERGK 20211013.02793 13.893B RFD 0.027 PERGK 20211013.02697 13.035V RFD 0.008 PERGK 20211009.27030 13.944B RFD 0.014 PERGK 20211009.26934 13.030V RFD 0.005 PERGK 20211009.26840 11.589I RFD 0.006 PERGK 20211009.26760 12.287R RFD 0.003 PERGK 20211009.26678 13.977B RFD 0.015 PERGK 20211009.26582 13.050V RFD 0.004 PERGK 20211009.26488 11.608I RFD 0.007 PERGK 20211009.26409 12.300R RFD 0.003 PERGK 20211009.26327 13.988B RFD 0.014 PERGK 20211009.26231 13.076V RFD 0.004 PERGK 20211008.18994 13.830B RFD 0.016 PERGK 20211008.18898 12.958V RFD 0.005 PERGK 20211008.18804 11.526I RFD 0.007 PERGK 20211008.18725 12.203R RFD 0.003 PERGK 20211008.18642 13.774B RFD 0.018 PERGK 20211008.18546 12.903V RFD 0.004 PERGK 20211008.18452 11.529I RFD 0.007 PERGK 20211008.18373 12.196R RFD 0.003 PERGK 20211008.18291 13.758B RFD 0.027 PERGK 20211008.18194 12.908V RFD 0.004 PERGK 20211007.04043 13.889B RFD 0.028 PERGK 20211007.03947 13.029V RFD 0.006 PERGK 20211007.03853 11.609I RFD 0.007 PERGK 20211007.03773 12.299R RFD 0.005 PERGK 20211007.03691 13.905B RFD 0.025 PERGK 20211007.03595 13.075V RFD 0.007 PERGK 20211007.03501 11.646I RFD 0.010 PERGK 20211007.03421 12.327R RFD 0.006 PERGK 20211007.03339 14.008B RFD 0.048 PERGK 20211007.03243 13.075V RFD 0.011 PERGK 20211005.23523 13.857B RFD 0.016 PERGK 20211005.23427 12.959V RFD 0.005 PERGK 20211005.23333 11.533I RFD 0.008 PERGK 20211005.23253 12.216R RFD 0.003 PERGK 20211005.23171 13.844B RFD 0.013 PERGK 20211005.23076 12.967V RFD 0.004 PERGK 20211005.22982 11.541I RFD 0.012 PERGK 20211005.22902 12.223R RFD 0.005 PERGK 20211005.22821 13.848B RFD 0.025 PERGK 20211005.22725 12.986V RFD 0.007

GK Persei  (NA+UGSS+NLDQ) Orbital period: 1.996872(9) d White dwarf spin period: 0.00406634 d = 5.85530 min = 351.332 s https://www.aavso.org/vsx/index.php?view=detail.top&oid=25717 https://asd.gsfc.nasa.gov/Koji.Mukai/iphome/systems/gkper.html

Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curve and data: https://asas-sn.osu.edu/sky-patrol/coordinate/888406e4-164d-447d-9a21-20d8fc...

AAVSO data: https://app.aavso.org/webobs/results/?star=000-BBG-044

Confirmation and follow-up observations are urgently required.

Clear skies, Patrick ------- T. Kato wrote (vsnet-alert 26646): GK Per rising Maeda-san has pointed out that GK Per is rising.

PERGK 20220309.4908912 125cG Mdy.VSOLJ rising#