Table I from Hall and Cannon (1974) Differential UBV Magnitudes of ZZ Cygni (including the visual companion) HJD Phase Vdmag Bdmag Udmag (2400000+) 40096.8387 0.5118 4.255 4.826 5.235 40096.8570 0.5408 4.213 4.769 5.147 40096.8828 0.5818 4.183 4.772 5.226 40097.5865 0.7013 4.156 4.782 5.159 40097.5985 0.7204 4.138 4.775 5.150 40097.6107 0.7398 4.172 4.820 5.178 40097.6249 0.7625 4.135 4.767 5.175 40130.5959 0.2125 4.161 4.812 5.164 40130.6239 0.2570 4.176 4.798 5.167 40130.6477 0.2949 4.135 4.764 5.157 40130.6716 0.3330 4.162 4.773 5.188 40421.8242 0.4963 4.287 4.886 - 40421.8302 0.5059 4.291 4.884 - 40421.8512 0.5393 4.277 4.867 - 40421.8572 0.5488 4.256 4.851 - 40421.8702 0.5695 4.205 4.812 5.222 40421.8772 0.5806 4.213 4.805 5.185 40421.8882 0.5981 4.177 4.806 5.187 40421.8932 0.6061 4.176 4.783 5.175 40422.6003 0.7305 4.144 4.780 5.230 40422.6103 0.7464 4.144 4.762 5.174 40422.6153 0.7544 4.127 4.790 5.194 40422.6483 0.8069 4.162 4.770 5.171 40422.6553 0.8180 4.166 4.788 5.179 40422.6663 0.8355 4.186 4.806 5.178 40422.6713 0.8434 4.182 4.811 5.214 40422.7053 0.8975 4.230 4.876 5.271 40422.7103 0.9055 4.252 4.906 5.303 40422.7183 0.9182 4.326 4.975 5.394 40422.7233 0.9262 4.357 5.011 5.410 40422.7273 0.9325 4.408 5.056 5.461 40422.7313 0.9468 4.528 5.180 5.609 40422.7483 0.9659 4.794 5.458 5.950 40422.7523 0.9723 4.885 5.567 6.017 40422.7613 0.9866 5.115 5.788 6.294 40422.7663 0.9946 5.202 5.899 6.391 40422.7723 0.0041 5.197 5.927 6.390 40422.7783 0.0137 5.077 5.765 6.247 40422.7870 0.0280 4.859 5.527 6.005 40422.7910 0.0343 4.773 5.427 5.858 40422.7990 0.0471 4.658 5.302 5.730 40422.8060 0.0582 4.504 5.137 5.542 40422.8090 0.0630 4.449 5.090 5.473 40422.8140 0.0709 4.386 5.018 5.395 40422.8230 0.0852 4.298 4.926 5.336 40422.8270 0.0916 4.276 4.927 5.355 40422.8320 0.0995 4.266 4.881 5.290 40422.8400 0.1123 4.221 4.838 5.233 40422.8450 0.1202 4.211 4.805 5.170 40422.8510 0.1298 4.223 4.824 5.201 40422.8590 0.1428 4.197 4.818 5.212 40422.8640 0.1505 4.215 4.835 5.243 40422.8730 0.1658 4.198 4.821 5.192 40422.8770 0.1711 4.187 4.810 5.206 40422.8860 0.1855 4.187 4.813 5.194 40422.8910 0.1934 4.182 4.830 5.196 40422.8990 0.2061 4.192 4.826 5.210 40422.9040 0.2141 4.212 4.838 5.147 40432.8704 0.0685 4.397 5.049 5.431 40432.8744 0.0749 4.390 4.977 5.299 40432.8834 0.0892 4.255 4.855 5.284 40432.8884 0.0972 4.249 4.839 5.237 40432.8984 0.1131 4.210 4.819 5.187 40432.9024 0.1194 4.211 4.812 5.176 40432.9144 0.1385 4.235 4.807 5.247 40433.7850 0.5235 4.318 4.937 5.337 40433.7890 0.5298 4.297 4.948 5.332 40433.7974 0.5432 4.289 4.893 5.281 40433.8020 0.5505 4.270 4.895 5.303 40433.8104 0.5639 4.242 4.879 5.304 40433.8600 0.6428 4.219 4.824 5.219 40433.8650 0.6507 4.222 4.774 5.249 40433.8740 0.6651 4.179 4.782 5.224 40433.8790 0.6730 4.207 4.776 5.254 40433.8870 0.6857 4.188 4.836 5.255 40433.8950 0.6985 4.178 4.809 5.252 40433.9030 0.7112 4.204 4.784 5.231 40433.9110 0.7239 4.149 4.754 5.189 40449.6416 0.7480 4.196 4.845 5.237 40449.6476 0.7577 4.184 4.853 5.254 40449.6616 0.7799 4.173 4.839 5.209 40449.6706 0.7942 4.174 4.828 5.200 40449.6796 0.8085 4.192 4.842 5.189 40449.6846 0.8165 4.186 4.839 5.210 40449.6946 0.8324 4.181 4.839 5.210 40449.7036 0.8467 4.194 4.839 5.220 40449.7126 0.8610 4.193 4.835 5.219 40449.7206 0.8737 4.203 4.854 5.222 40449.7256 0.8817 4.188 4.845 5.227 40449.7346 0.8960 4.211 4.845 5.250 40449.7396 0.9039 4.240 4.865 5.251 40449.7436 0.9103 4.272 4.922 5.317 40449.7526 0.9246 4.364 4.959 5.345 40449.7586 0.9342 4.443 5.030 5.444 40449.7636 0.9421 4.532 5.105 5.518 40449.7726 0.9564 4.731 5.316 5.772 40449.7766 0.9628 4.815 5.389 5.878 40449.7826 0.9724 4.959 5.581 6.011 40449.7906 0.9851 5.084 5.770 6.234 40449.7956 0.9930 5.212 5.891 6.369 40449.8016 0.0026 5.227 5.947 6.458 40449.8066 0.0105 5.154 5.860 6.342 40457.5930 0.3970 4.201 4.813 5.251 40457.6020 0.4114 4.212 4.808 5.239 40457.6100 0.4241 4.222 4.835 5.240 40457.6180 0.4368 4.246 4.838 5.262 40457.6230 0.4448 4.247 4.848 5.277 40457.6320 0.4591 4.265 4.854 5.288 40457.6360 0.4654 4.287 4.869 5.279 40457.6440 0.4782 4.283 4.865 5.264 40457.6520 0.4909 4.310 4.886 5.284 40457.6560 0.4973 4.311 4.867 5.300 40457.6640 0.5100 4.294 4.861 5.306 40457.6690 0.5179 4.293 4.883 5.298 40457.6780 0.5323 4.286 4.886 5.265 40457.6830 0.5402 4.277 4.863 5.237 40457.6910 0.5529 4.268 4.860 5.268 40457.6960 0.5609 4.266 4.869 5.318 40457.7030 0.5720 4.257 4.867 5.306 40457.7050 0.5752 4.248 4.863 5.306 40457.7150 0.5911 4.252 4.863 5.282 40457.7200 0.5991 4.253 4.854 5.280 40457.7270 0.6102 4.247 4.857 5.288 40457.7340 0.6213 4.245 4.859 5.308 40457.7420 0.6341 4.214 4.846 5.274 40457.7470 0.6420 4.210 4.794 5.253 40457.7550 0.6547 4.187 4.795 5.238 40457.7610 0.6643 4.221 4.822 5.273 40457.7690 0.6770 4.187 4.804 5.225 40457.7740 0.6850 4.202 4.816 5.232 40457.7810 0.6961 4.219 4.830 5.259 40457.7860 0.7041 4.212 4.840 5.264 40457.7980 0.7231 4.223 4.825 5.262 40457.8020 0.7295 4.203 4.844 5.384 40457.8110 0.7438 4.188 4.781 5.213 40457.8160 0.7518 4.197 4.791 5.210 40457.8240 0.7645 4.207 4.814 5.241 40457.8330 0.7788 4.204 4.808 5.209 40457.8490 0.8043 4.194 4.778 5.203 40459.6867 0.7234 4.212 4.849 5.269 40459.6957 0.7377 4.211 4.874 5.233 40459.7497 0.8236 4.214 4.835 5.213 40459.7587 0.8379 4.202 4.819 5.222 40459.7657 0.8491 4.226 4.805 5.255 40459.7747 0.8634 4.233 4.840 5.191 40459.8017 0.9063 4.298 4.887 5.374 40459.8127 0.9238 4.328 4.922 5.336 40459.8207 0.9366 4.467 5.088 5.467 40459.8287 0.9493 4.590 5.207 5.651 40470.7556 0.3343 4.148 4.756 5.166 40470.7636 0.3487 4.136 4.752 5.116 40470.7716 0.3615 4.146 4.758 5.149 40474.6455 0.5240 4.282 4.883 5.275 40474.6505 0.5320 4.247 4.880 5.272 40474.6575 0.5431 4.262 4.874 5.271 40474.6625 0.5511 4.232 4.866 5.265 40474.6675 0.5590 4.235 4.863 5.246 40474.6745 0.5702 4.234 4.863 5.243 40474.6795 0.5781 4.212 4.852 5.229 40474.6835 0.5845 4.205 4.842 5.238 40474.6905 0.5956 4.201 4.850 5.254 40474.6955 0.6036 4.205 4.841 5.242 40474.6995 0.6100 4.216 4.857 5.259 40474.7075 0.6227 4.218 4.851 5.240 40474.7115 0.6290 4.205 4.846 5.252 40474.7165 0.6370 4.205 4.853 5.257 40475.7335 0.2548 4.214 4.831 5.234 40475.7375 0.2612 4.209 4.833 5.241 40475.7455 0.2738 4.205 4.827 5.224 40475.7535 0.2867 4.191 4.815 5.220 40475.7615 0.2994 4.197 4.803 5.213 40475.7695 0.3121 4.191 4.817 5.220 40475.7795 0.3280 4.188 4.796 5.191 40475.7875 0.3407 4.195 4.827 5.229