Norwegian Astronomical Society - Variable Star Section CCD observations by observers of NAS.VSS (Report 1999v-014): Object YYMMDD(UT) Mag Obs Instrum Notes PERGK 990220.794 12.2C TOL C610+CCD AAVSO seq. PERGK 990220.796 11.8C TOL C610+CCD PERGK 990220.805 12.1C TOL C610+CCD PERGK 990220.808 12.0C TOL C610+CCD PERGK 990220.810 12.0C TOL C610+CCD PERGK 990220.817 12.2C TOL C610+CCD PERGK 990220.821 11.9C TOL C610+CCD PERGK 990220.829 12.0C TOL C610+CCD PERGK 990220.876 12.1C TOL C610+CCD PERGK 990220.879 12.0C TOL C610+CCD PERGK 990220.886 12.0C TOL C610+CCD PERGK 990220.893 12.1C TOL C610+CCD PERGK 990220.905 12.1C TOL C610+CCD PERGK 990220.913 12.0C TOL C610+CCD PERGK 990220.920 11.9C TOL C610+CCD PERGK 990220.923 11.9C TOL C610+CCD PERGK 990220.938 12.2C TOL C610+CCD TOL = Odd Trondal (Oslo, Norway). Instrument: 61-cm cassegrain reflector + unfiltered ST-4 CCD (C610+CCD). Exposure times were 15 seconds. Comparison stars of GK Per: AAVSO 126 and 136.