COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 795 Konkoly Observatory Budapest 1973 May 21 MINIMA OF ECLIPSING VARIABLES (XI) This report revives the series of minima of eclipsing variables the last of which was published in IBVS No. 247. Given here are 676 observed heliocentric minima of 48 eclipsing variable stars. All are visual timings reduced by the tracing-paper method, except where noted. Linear elements in the 1969 General Catalogue of Variable Stars were used to compute the O - C values unless otherwise specified. This is a change from previous reports of this series which used the 1958 edition as the prime reference. The number of estimates used for each minimum is given under n. J.D. hel. (2400000+) E O-C n Observer ------------------------------------------------ RT Andromedae ------------- 39699.767 10203 +0.009 5 T. Cragg 39772.706 10319 -0.008 20 M. Baldwin 39801.637 10365 -0.008 14 R. Swanberg 39801.640 10365 -0.005 14 M. Baldwin 39813.596 10384 0.000 17 J. Bortle 39813.603 10384 +0.008 17 A. Dobrowski 39821.766 10397 -0.005 17 M. Baldwin 39823.648 10400 -0.010 20 M. Baldwin 39826.799 10405 -0.004 12 M. Baldwin 39828.691 10408 +0.002 9 T. Cragg 39830.584 10411 +0.007 15 Carl Anderson 39833.716 10416 -0.005 12 H. Peterson 39833.717 10416 -0.004 13 H. Swanberg 39847.558 10438 +0.001 14 H. Blake 39862.639 10462 -0.013 7 M. Baldwin 39891.582 10508 -0.001 16 J. Bortle 39908.555 10535 -0.009 13 J. Bortle 40008.557 10694 -0.007 17 A. Dobkowski 40025.562: 10721 +0.017: 15 A. Dobkowski 40030.581 10729 +0.004 15 A. Dobkowski 40094.724 10831 -0.003 15 M. Baldwin 40096.612 10834 -0.002 16 J. Bortle 40096.619 10834 +0.005 9 L. Hazel 40099.753 10839 -0.006 9 M. Baldwin 40108.556 10853 -0.008 17 J. Bortle 40113.594 10861 -0.001 18 J. Bortle 40113.597 10861 +0.002 13 K. Simons 40116.733 10866 -0.007 14 H. Peterson 40116.736 10866 -0.004 13 M. Baldwin 40118.625 10869 -0.002 19 J. Bortle 40128.686 10885 -0.003 10 M. Baldwin 40135.610 10896 +0.002 13 J. Bortle 40145.668 10912 -0.002 13 H. Peterson 40184.661 10974 -0.003 12 M. Baldwin 40196.614 10993 0.000 16 J. Bortle 40208.559 11012 -0.005 13 J. Bortle 40211.704 11017 -0.004 8 M. Baldwin 40245.666 11071 -0.005 9 M. Baldwin 40411.698 11335 -0.010 16 Carl Anderson 40436.865 11375 0.000 15 M. Baldwin 40443.777 11386 -0.007 11 M. Baldwin 40455.727 11405 -0.007 14 Carl Anderson 40457.625 11408 +0.005 12 D. Ortwein 40470.816 11429 -0.012 10 M. Baldwin 40486.563 11454 +0.011 14 D. Ortwein 40491.584 11462 +0.001 13 D. Ortwein 40503.538 11481 +0.005 11 D. Ortwein 40513.591 11497 -0.004 12 J. Bortle 40513.612 11497 +0.017 15 D. Ortwein 40528.683 11521 -0.006 14 M. Baldwin 40547.554 11551 -0.003 14 J. Bortle 40547.557 11551 0.000 15 D. Ortwein 40557.609 11567 -0.012 10 M. Baldwin 40557.618 11567 -0.003 11 R. Swanberg 40562.643 11575 -0.009 8 M. Baldwin TW Andromedae ------------- 40475.747 4954 +0.013 22 M. Baldwin 40512.860 4963 +0.022 21 M. Baldwin WZ Andromedae ------------- 39799.591 6791 +0.009 7 D. Livingston 39826.700 6830 -0.014 17 M. Baldwin 39826.705 6830 -0.009 13 F. Chapman 39854.546 6870 +0.006 15 L. Hazel 40116.798 7247 -0.006 12 M. Baldwin 40128.621 7264 -0.009 14 L. Hazel 40151.579 7297 -0.009 19 J. Bortle 40151.583: 7297 -0.005: 11 D. Livingston 40178.718 7336 0.000 11 M. Baldwin 40208.625 7379 -0.006 20 J. Bortle 40215.571: 7389 -0.017: 6 K. Simmons 40436.805 7707 -0.004 14 M. Baldwin 40443.750 7717 -0.015 20 M. Baldwin 40583.576 7918 -0.018 12 L. Hazel XZ Andromedae ------------- 39801.676 476 -0.001 18 M. Baldwin 39805.747 479 -0.001 14 W. Lowder 39820.677 490 -0.002 14 S. Cook 39820.679 490 0.000 13 H. Blake 49820.679 490 0.000 15 L. Hazel 39839.678 504 -0.003 28 R. Swanberg 39854.610 515 -0.001 23 F. Chapman 39854.610 515 -0.001 11 W. Lowder 39892.614 543 -0.002 11 W. Lowder 39892.616 543 0.000 17 M. Baldwin 39896.687 546 -0.001 21 M. Baldwin 39915.685 560 -0.004 18 R. Swanberg 39915.689 560 -0.001 18 M. Baldwin 40120.635 711 -0.006 15 L. Hazel 40124.711 714 -0.002 14 H. Peterson 40128.782 717 -0.003 20 M. Baldwin 40128.790 717 +0.005 12 L. Hazel 40147.789 731 +0.002 10 T. Cragg 40196.647 767 -0.003 19 J. Bortle 40268.584 820 -0.003 24 J. Bortle 40436.887 944 -0.004 16 M. Baldwin 40447.746 952 -0.004 19 M. Baldwin 40451.815 955 -0.006 15 L. Hazel 40466.748 966 -0.004 26 M. Baldwin 40470.820 969 -0.004 20 M. Baldwin 40512.898 1000 -0.002 12 M. Baldwin 40538.685 1019 -0.004 10 L. Hazel 40557.684 1033 -0.006 10 M. Baldwin 40557.689 1033 -0.002 16 R. Swanberg 40587.542 1055 -0.009 10 L. Hazel AB Andromedae ------------- 39772.673 11037 +0.011 10 M. Baldwin 39786.617 11079 +0.016 9 W. Lowder 39787.612 11082 +0.015 9 W. Lowder 39790.599 11091 +0.015 10 H. Blake 39793.585 11100 +0.014 17 F. Chapman 39793.589 11100 +0.018 21 D. Livingston 39793.602: 11100 +0.031: 14 H. Blake 39793.745 11100.5 +0.008 15 F. Chapman 39794.574: 11103 +0.008: 9 H. Blake 39794.575 11103 +0.009 22 F. Chapman 39797.729 11112.5 +0.009 16 M. Baldwin 39799.559 11118 +0.014 11 J. Bortle 39800.551 11121 +0.011 14 J. Bortle 39800.717 11121.5 +0.010 17 M. Baldwin 39801.717 11124.5 +0.015 10 M. Baldwin 39820.637 11181.5 +0.017 14 J. Bortle 39821.627 11184.5 +0.011 6 M. Baldwin 39822.613: 11187.5 +0.001: 14 A. Dobkowski 39822.626 11187.5 +0.014 15 J. Bortle 39823.601 11190.5 -0.006 16 C. Ricker 39823.619 11190.5 +0.012 10 M. Baldwin 39826.603 11199.5 +0.009 5 M. Baldwin 39829.590 11208.5 +0.009 15 F. Chapman 39829.592 11208.5 +0.011 11 J. Bortle 39842.537 11247.5 +0.012 11 J. Bortle 39844.533 11253.5 +0.017 9 J. Bortle 39845.527 11256.5 +0.015 10 J. Bortle 39845.534 11256.5 +0.022 19 D. Livingston 39848.516 11265.5 +0.017 15 D. Livingston 39851.659 11275 +0.007 13 J. Bortle 39851.659 11275 +0.007 14 M. Baldwin 39854.660 11284 +0.021 10 H. Peterson 39855.660 11287 +0.025 19 H. Peterson 39859.630 11299 +0.012 8 M. Baldwin 39861.618 11305 +0.009 13 J. Bortle 39862.616 11308 +0.012 15 H. Peterson 39867.586 11323 +0.003 24 A. Dobkowski 39867.588 11323 +0.005 16 F. Chapman 39876.541 11350 -0.003 16 A. Dobkowski 39877.550 11353 +0.011 13 J. Bortle 39882.530 11368 +0.012 11 J. Bortle 39885.684 11377.5 +0.013 6 T. Cragg 39890.645 11392.5 -0.004 17 A. Dobkowski 40056.772 11893 +0.011 14 M. Baldwin 40058.765 11899 +0.013 14 M. Baldwin 40059.761 11902 +0.014 11 M. Baldwin 40063.742 11914 +0.011 11 M. Baldwin 40064.737 11917 +0.011 12 M. Baldwin 40069.719 11932 +0.015 8 M. Baldwin 40070.714 11935 +0.014 8 M. Baldwin 40080.673 11965 +0.017 13 J. Bortle 40081.670 11968 +0.018 13 J. Bortle 40084.653 11977 +0.014 12 J. Bortle 40087.642 11986 +0.016 15 J. Bortle 40094.779 12007.5 +0.017 8 M. Baldwin 40095.606 12010 +0.014 16 J. Bortle 40096.601 12013 +0.014 15 J. Bortle 40103.573 12034 +0.016 13 J. Bortle 40116.681 12073.5 +0.014 7 M. Baldwin 40117.688 12076.5 +0.026 16 H. Peterson 40128.637 12109.5 +0.022 17 J. Bortle 40128.796 12110 +0.015 9 M. Baldwin 40134.606 12127.5 +0.017 17 J. Bortle 40135.600 12130.5 +0.015 17 J. Bortle 40137.592 12136.5 +0.016 14 J. Bortle 40146.716 12164 +0.013 11 H. Peterson 40156.676 12194 +0.016 13 M. Baldwin 40157.675 12197 +0.019 15 J. Bortle 40160.658 12206 +0.016 19 J. Bortle 40161.653 12209 +0.015 19 J. Bortle 40180.569 12266 +0.013 15 J. Bortle 40181.561 12269 +0.009 14 J. Bortle 40187.707 12287.5 +0.016 18 H. Peterson 40196.666 12314.5 +0.013 16 J. Bortle 40197.664 12317.5 +0.015 16 J. Bortle 40200.652 12326.5 +0.016 16 J. Bortle 40208.614 12350.5 +0.013 19 J. Bortle 40215.588: 12371.5 +0.017: 5 K. Simmons 40219.563 12383.5 +0.010 10 K. Simmons 40220.563 12386.5 +0.014 13 J. Bortle 40256.559 12435 0.000 15 A. Dobkowski 40436.789 13038 +0.013 11 M. Baldwin 40437.780 13041 +0.008 10 T. Cragg 40443.763 13059 +0.017 13 M. Baldwin 40447.745 13071 +0.016 11 M. Baldwin 40449.734 130?7 +0.014 11 M. Baldwin 40451.732 13083 +0.021 11 M. Baldwin 40457.701 13101 +0.016 9 M. Baldwin 40470.810 13140.5 +0.015 10 M. Baldwin 40471.806 13143.5 +0.015 6 M. Baldwin 40478.599 13164 +0.005 15 D. Ortwein 40483.590 13179 +0.017 9 J. Bortle 40513.619 13269.5 +0.010 17 F. Chapman 40513.624 13269.5 +0.015 10 M. Baldwin 40528.723 13315 +0.013 10 M. Baldwin 40556.604 13399 +0.015 12 M. Baldwin RY Aquarii ---------- 40446.811 3343 -0.062 13 R. Monske 40454.688 3347 -0.051 14 L. Hazel 40456.674 3348 -0.032 20 R. Monske CX Aquarii ---------- 39732.760 5898 +0.004 12 T. Cragg 40094.710 6549 +0.008 8 M. Baldwin 40099.715 6558 +0.009 9 M. Baldwin 40113.615 6583 +0.009 17 K. Simmons 40129.731 6612 +0.002 12 M. Baldwin 40178.661 6700 +0.004 11 M. Baldwin 40437.753 7166 +0.007 13 T. Cragg 40446.649 7182 +0.007 12 R. Monske 40447.760 7184 +0.007 15 M. Baldwin 40456.656 7200 +0.007 16 R. Monske 40457.766 7202 +0.005 11 M. Baldwin OO Aquilae ---------- 39659.743 11315 -0.002 15 Curtis Anderson 39661.775 11319 +0.003 13 Curtis Anderson 39678.739 11352.5 -0.011 10 Curtis Anderson 39685.846: 11366.5 +0.001: 9 Curtis Anderson 39694.709 11384 -0.004 10 M. Baldwin 39696.738 11388 -0.002 11 Curtis Anderson 39699.779 11394 -0.003 6 T. Cragg 39699.786 11394 +0.004 11 Curtis Anderson 39701.805 11398 -0.004 10 M. Baldwin 39715.750 11425.5 +0.004 11 S. Cook 39729.676 11453 -0.007 8 Curtis Anderson 39730.685 11455 -0.011 10 Curtis Anderson 39734.746 11463 -0.005 9 Curtis Anderson 39737.783 11469 -0.008 14 M. Baldwin 39743.625 11480.5 +0.006 11 Curtis Anderson 39757.808 11508.5 -0.001 11 M. Baldwin 39764.659 11522 +0.007 10 Curtis Anderson 39765.658 11524 -0.006 10 Curtis Anderson 39800.623 11593 -0.010 11 M. Baldwin 39801.637 11595 -0.010 15 M. Baldwin 40046.677 12078.5 -0.005 9 Curtis Anderson 40047.688 12080.5 -0.008 13 Curtis Anderson 40048.701 12082.5 -0.008 11 Curtis Anderson 40052.751 12090.5 -0.012 7 Curtis Anderson 40053.771 12092.5 -0.006 11 T. Cragg 40054.782 12094.5 -0.008 6 T. Cragg 40056.811 12098.5 -0.006 13 M. Baldwin 40058.834 12102.5 -0.011 14 M. Baldwin 40066.681 12118 -0.019 14 Curtis Anderson 40066.686 12118 -0.014 12 R. Monske 40067.702 12120 -0.012 13 R. Monske 40069.728 12124 -0.013 10 M. Baldwin 40070.740 12126 -0.015 15 M. Baldwin 40081.648 12147.5 -0.003 24 J. Bortle 40096.588 12177 -0.013 18 J. Bortle 40113.575 12210.5 -0.004 10 K. Simmons 40115.596 12214.5 -0.010 16 J. Bortle 40126.748 12236.5 -0.007 8 T. Cragg 40128.775 12240.5 -0.008 14 M. Baldwin 40134.605 12252 -0.006 19 J. Bortle 40151.580 12285.5 -0.008 15 J. Bortle 40156.644 12295.5. -0.012 14 M. Baldwin 40417.648 12810.5 -0.007 15 J. Bortle 40418.660 12812.5 -0.009 5 W. Hampton 40418.660 12812.5 -0.009 14 J. Bortle 40439.667 12854 -0.033 11 R. Monske 40442.722 12860 -0.019 12 M. Baldwin 40443.736 12862 -0.019 13 M. Baldwin 40447.780 12870 -0.029 14 M. Baldwin 40453.625 12881.5 -0.012 14 Carl Anderson 40454.639 12883.5 -0.012 13 J. Bortle 40455.655 12885.5 -0.010 10 R. Monske 40455.661 12885.5 -0.004 9 W. Hampton V342 Aquilae ------------ 39674.630 1) 1192 +0.006 16 M. Baldwin 39701.751 1200 -0.001 26 M. Baldwin 40525.758: 2) 1443 +0.003: 5 T. Cragg V343 Aquilae ------------ 40084.710 6311 +0.004 18 L. Hazel V346 Aquilae ------------ 39706.757 7572 -0.012 8 T. Cragg 40070.760 7901 -0.003 16 M. Baldwin 40454.667 8248 -0.004 16 J. Bortle 40455.775 8249 -0.003 15 R. Monske 40465.721 8258 -0.014 15 T. Cragg 40465.728 8258 -0.007 16 M. Baldwin 40475.686 8267 -0.007 11 M. Baldwin WW Aurigae ---------- 39828.744 2726 +0.003 10 S. Cook 39852.724 2735.5 -0.005 6 T. Cragg 39852.7308 2735.5 +0.0014 20pe L. Kalish 39857.7790 2737.5 -0.0004 28pe L. Kalish 39876.723 2745 +0.006 11 S. Cook 39890.618 2750.5 +0.014 16 M. Baldwin 39905.753 2756.5 -0.002 9 S. Cook 39910.766: 2758.5 -0.039: 5 T. Cragg 39919.658 2762 +0.015 11 S. Cook 40184.781: 2867 +0.011: 18 R. Nolthenius 40186.037: 2867.5 +0.005: 16 R. Nolthenius 40203.707 2874.5 0.000 15 R. Nolthenius 40208.751: 2876.5 -0.006: 20 M. Baldwin 40208.765: 2876.5 +0.008: 1.5 R. Nolthenius 40213.816: 2878.5 +0.009: 15 R. Nolthenius 40227.657 2884 -0.038 14 T. Cragg 40251.688: 2893.5 +0.006: 14 R. Nolthenius 40280.719 2905 -0.001 15 M. Baldwin 40289.559 2908.5 +0.001 19 J. Bortle 40318.591 2920 -0.005 12 J. Bortle 40554.683 3013.5 -0.002 15 M. Baldwin 40583.716 3025 -0.006 17 M. Daw 40583.717 3025 -0.005 15 J. Green 40583.722 3025 0.000 14 R. Sweetsir 40583.724 3025 +0.002 12 D. Ortwein AR Aurigae ---------- 39859.657 3172.5 +0.012 12 M. Baldwin 39890.680 3180 +0.026 17 M. Baldwin 39892.738 3180.5 +0.016 14 M. Baldwin 40539.821 3337 +0.024 20 M. Baldwin Y Camelopardalis ---------------- 39940.594 1221 +0.011 14 J. Bortle SV Camelopardalis ----------------- 39635.802 9878 +0.014 12 Curtis Anderson 39647.654 9898 +0.005 29 D. Livingston 39692.732 9974 +0.010 12 Curtis Anderson 39772.785 10109 -0.002 10 M. Baldwin 39794.731 10146 0.000 11 F. Sanner 39797.701 10151 +0.005 14 M. Baldwin 39800.657 10156 -0.005 17 M. Baldwin 39800.667 10156 +0.005 13 F. Sanner 39803.627 10161 0.000 13 F. Sanner 39803.629 10161 +0.002 9 W. Hampton 39803.634 10161 +0.007 17 J. Bortle 39820.829 10190 +0.003 12 F. Sanner 39822.611 10193 +0.005 19 J. Bortle 39826.756 10200 -0.001 13 M. Baldwin 39835.652 10215 -0.001 11 S. Cook 39844.546 10230 -0.003 27 A. Dobkowski 39844.552 10230 +0.003 14 J. Bortle 39848.712 10237 +0.012 13 S. Cook 39851.665 10242 -0.001 14 M. Baldwin 39854.619 10247 -0.012 11 F. Sanner 39854.634 10247 +0.003 10 S. Cook 39857.597 10252 +0.001 13 F. Sanner 39861.751 10259 +0.003 12 F. Sanner 39861.754 10259 +0.006 8 M. Baldwin 39880.732 10291 +0.005 10 S. Cook 39892.593 10311 +0.005 17 J. Bortle 39895.544 10316 -0.009 18 A. Dobkowski 39896.749 10318 +0.009 11 M. Baldwin 39908.608 10338 +0.007 19 J. Bortle 39911.567 10343 +0.001 14 A. Dobkowski 39912.756 10345 +0.004 13 M. Baldwin 39915.717 10350 -0.001 18 M. Baldwin 39918.688 10355 +0.005 15 S. Cook 39918.689 10355 +0.006 15 M. Baldwin 39921.649 10360 0.000 17 A. Dobkowski 39927.581 10370 +0.002 15 J. Bortle 39934.701 10382 +0.005 14 S. Cook 39937.664 10387 +0.003 11 M. Baldwin 39940.624 10392 -0.003 13 F. Sanner 39940.629 10392 +0.002 18 J. Bortle 39943.586 10397 -0.006 13 F. Sanner 39946.569 10402 +0.011 15 J. Bortle 39962.564 10429 -0.006 17 A. Dobkowski 39969.690 10441 +0.003 9 S. Cook 39972.649 10446 -0.004 19 F. Chapman 39994.600 10483 +0.004 10 W. Hampton 40013.584 10515 +0.009 13 J. Bortle 40080.590 10628 -0.001 14 J. Bortle 40096.605 10655 +0.001 17 J. Bortle 40112.619 10682 +0.011 19 J. Bortle 40115.586 10687 +0.003 19 J. Bortle 40116.772 10689 +0.003 16 M. Baldwin 40118.551 10692 +0.003 17 J. Bortle 40125.671 10704 +0.006 11 M. Baldwin 40128.629 10709 -0.002 12 M. Baldwin 40128.633: 10709 +0.002: 19 J. Bortle 40134.566 10719 +0.005 19 J. Bortle 40147.613 10741 +0.004 19 J. Bortle 40160.662 10763 +0.006 19 J. Bortle 40186.758 10807 +0.007 16 M. Baldwin 40208.700 10844 +0.005 18 M. Baldwin 40211.664 10849 +0.004 13 M. Baldwin 40220.555 10864 -0.001 16 J. Bortle 40227.680: 10876 +0.007: 9 T. Cragg 40278.678 10962 +0.001 9 M. Baldwin 40306.542 11009 -0.010 13 A. Dobkowski 40319.598 11031 -0.002 17 J. Bortle 40323.753 11038 +0.002 12 M. Baldwin 4033?.653 11053 +0.006 18 R. Sweetsir 40332.654 11053 +0.007 21 J. Bortle 40338.582 11063 +0.004 15 J. Bortle 40339.772 11065 +0.008 14 R. Sweetsir 40348.663 11080 +0.003 18 J. Bortle 40380.691 11134 +0.005 20 J. Bortle 40447.704 11247 +0.001 10 M. Baldwin 40466.680 11279 -0.002 13 M. Baldwin 40470.837 11286 +0.004 10 M. Baldwin 40510.568 11353 0.000 13 J. Bortle 40561.572 11439 -0.001 11 J. Bortle AL Camelopardalis ----------------- 40296.590 10453 -0.002 23 J. Bortle 40369.652 10508 +0.002 18 J. Bortle 40373.635 10511 0.000 18 J. Bortle 40454.660 10572 -0.003 16 J. Bortle R Canis Majoris --------------- 39822.846 3792 +0.007 14 F. Sanner 39863.738 3828 +0.005 18 F Sanner 39870.531 3834 -0.018 21 A. Dobkowski 39872.817 3836 -0.003 6 S. Cook 39896.670 3857 -0.005 21 M. Baldwin 39904.632 3864 +0.005 19 J. Bortle 39905.772 3865 +0.010 9 S. Cook 39912.577 3871 -0.001 18 R. Thompson 39912.592 3871 +0.014 15 J. Bortle 39912.5843 3) 3871 +0.0060 59pe A. Stokes 39929.637 3886 +0.019 14 R. Sweetsir 39954.596 3908 -0.012 15 A. Dobkowski 40288.578 4202 +0.004 12 J. Bortle 40313.571 4224 +0.007 14 R. Sweetsir 40582.783 4461 +0.001 7 R. Sweetsir RZ Cassiopeiae -------------- 39694.646 2134 0.000 12 M. Baldwin 39701.810 2140 -0.008 15 M. Baldwin 39737.675 2170 0.000 12 M. Baldwin 39768.752 2196 +0.001 19 F. Sanner 39774.723 2201 -0.004 16 F. Sanner 39793.849 2217 -0.003 17 F. Sanner 39810.587 2231 +0.002 19 J. Bortle 39817.750 2237 -0.006 15 S. Cook 39822.545 2241 +0.008 16 F. Sanner 39830.892: 2248 -0.012: 8 T. Cragg 39835.673 2252 -0.012 10 T. Cragg 39835.686 2252 +0.001 14 S. Cook 39847.640 2262 +0.002 21 R. Swanberg 39856.005 2269 0.000 15 F. Sanner 39859.591 2272 +0.001 8 M. Baldwin 39860.776 2273 -0.009 13 F. Sanner 39860.784 2273 -0.001 11 S. Cook 39872.740 2283 +0.002 12 S. Cook 39878.712 2288 -0.003 13 S. Cook 39884.685 2293 -0.005 14 S. Cook 39884.689 2293 -0.001 9 T. Cragg 39884.692 2293 +0.002 16 M. Baldwin 39890.665 2298 -0.002 20 D. Lucas 39890.669 2298 +0.002 24 M. Baldwin 39896.647 2303 +0.004 18 M. Baldwin 39902.605 2308 -0.014 13 A. Dobkowski 39908.585 2313 -0.011 19 R. Thompson 39908.598 2313 +0.002 19 J. Bortle 39915.766 2319 -0.001 18 M. Baldwin 39945.642 2344 -0.006 17 F. Sanner 39945.646 2344 -0.002 28 R. Thompson 39957.582 2354 -0.019 14 A. Dobkowski 39963.577 2359 0.000 19 T. Balonek 40037.682 2421 0.000 19 T. Balonek 40056.807 2437 +0.001 20 M. Baldwin 40080.707 2457 -0.004 20 T. Balonek 40098.639 2472 -0.001 19 J. Bortle 40098.641 2472 +0.001 18 T. Balonek 40098.649 2472 +0.009 13 L. Hazel 40116.575 2487 +0.007 10 A. Heasley 40117.764: 2488 0.000: 7 R. Nolthenius 40129.715 2498 -0.001 16 R. Swanberg 40129.720 2498 +0.004 20 M. Baldwin 40147.647 2513 +0.002 13 L. Hazel 40147.649 2513 +0.004 14 M. Baldwin 40178.720 3539 -0.001 18 R. Nolthenius 40178.722 2539 +0.001 18 M. Baldwin 40184.699 2544 +0.001 16 R. Swanberg 40196.6523 2554 +0.0024 21pe H. Landis 40196.654 2554 +0.004 19 J. Bortle 40202.6291 2559 +0.0022 17pe H. Landis 40208.6055 2564 -0.0031 23pe H. Landis 40208.609 2564 +0.007 19 J. Bortle 40220.550 2574 -0.005 11 K. Simmons 40220.557 2574 +0.002 19 J. Bortle 40227.732 2580 +0.005 17 T. Cragg 40233.712 2595 +0.009 20 R. Sweetsir 40245.658 2595 +0.003 16 M. Baldwin 40270.760 2616 +0.005 21 M. Baldwin 40282.710 2626 +0.002 14 T. Cragg 40294.664 2636 +0.003 16 M. Baldwin 40318.568 2656 +0.003 9 J. Bortle 40429.707: 2749 -0.016: 25 R. Swanberg 40429.722 2749 -0.001 19 T. Balonek 40436.897 2755 +0.003 18 M. Baldwin 40442.874 2760 +0.003 15 M. Baldwin 40447.650 2764 -0.002 18 R. Balonek 40453.624 2769 -0.004 21 T. Balonek 40453.629 2769 +0.001 15 L. Hazel 40453.633 2769 +0.005 22 Carl Anderson 40454.820 2770 -0.003 18 T. Balonek 40454.822 2770 -0.001 13 R. Sweetsir 40466.776 2780 0.000 19 M. Baldwin 40502.635 2810 +0.002 17 D. Ortwein 40533.713 2836 +0.003 17 J. Green 40533.713 2836 +0.003 18 R. Sweetsir 40539.687 2841 +0.001 13 M. Baldwin 40557.6139 2856 -0.0007 11pe H. Landis 40557.614 2856 0.000 15 R. Swanberg 40557.615 2856 +0.001 12 M. Baldwin TV Cassiopeiae -------------- 39831.682 10876 -0.013 12 S. Cook 39851.626 10887 -0.007 12 S. Cook 39860.675 10892 -0.022 13 S. Cook 39869.747 10897 -0.013 12 S. Cook 40161.580 11058 -0.010 22 J. Bortle 40219.591 11090 -0.002 11 K. Simmons 40219.599 11090 +0.006 13 R. Sweetsir 40228.657 11095 +0.001 16 T. Cragg 40248.586 11106 -0.009 18 J. Bortle 40585.732: 11292 -0.009: 18 T. Cragg ZZ Cassiopeiae -------------- 40418.658 5614 +0.002 17 J. Bortle AB Cassiopeiae -------------- 39734.678 4476 +0.009 18 L. Hazel 39801.654 4525 +0.008 22 M. Baldwin 39917.836 4610 +0.006 9 M. Baldwin 40125.604 4762 +0.008 12 L. Hazel 40129.705 4765 +0.009 18 M. Baldwin 40151.577 4781 +0.011 23 J. Bortle 40211.718 4825 +0.009 23 M. Baldwin 40233.588 4841 +0.010 19 J. Bortle 40274.592 4871 +0.007 20 J. Bortle 40278.693 4874 +0.008 13 M. Baldwin 40289.628 4882 +0.008 14 J. Bortle 40293.732 4885 +0.010 13 M. Baldwin 40323.800 4907 +0.008 16 M. Baldwin 40412.651 4972 +0.012 14 J. Bortle 40442.719 4994 +0.008 13 M. Baldwin 40446.814 4997 +0.003 17 R. Monske 40453.646 5002 +0.001 14 L. Hazel 40457.757 5005 +0.011 11 M. Baldwin 40468.691 5013 +0.009 13 M. Baldwin 40554.804 5076 +0.009 19 M. Baldwin 40561.640 5081 +0.011 16 J. Bortle 40572.573 5089 +0.009 14 J. Bortle 40587.607 5100 +0.007 12 L. Hazel IV Cassiopeiae -------------- 40097.716 8672 +0.027 14 L. Hazel U Cephei -------- 39834.688 619 -0.006 15 S. Cook 39839.674 621 -0.007 13 S. Cook 39844.666 623 0.000 15 S. Cook 39849.650 625 -0.002 20 S. Cook 39854.629: 627 -0.009: 13 S. Cook 39859.622 629 -0.003 17 M. Baldwin 40178.733 757 -0.001 19 M. Baldwin 40380.672 838 +0.001 25 J. Bortle 40512.809 891 +0.008 20 M. Baldwin 40557.681 909 +0.005 24 M. Baldwin 40562.663 911 +0.001 22 M. Baldwin XX Cephei --------- 39821.582 785 +0.005 9 M. Baldwin 40237.617 963 -0.003 22 J. Bortle 40473.660 1064 -0.028 12 L. Hazel ZZ Cephei --------- 40528.668 5883 +0.008 22 M. Baldwin EG Cephei --------- 40028.659 24052 -0.004 12 L. Hazel 40095.664 24175 +0.012 16 J. Bortle 40107.646 24197 +0.013 19 J. Bortle 40113.636 24208 +0.012 19 J. Bortle 40137.595 24252 +0.008 17 J. Bortle 40156.652 24287 +0.003 20 J. Bortle 40161.561 24296 +0.010 19 J. Bortle 40253.601 24465 +0.010 14 J. Bortle 40296.623 24544 +0.007 18 J. Bortle 40302.620 24555 +0.013 18 J. Bortle 40363.611 24667 +0.007 18 J. Bortle 40369.606 24678 +0.011 14 J. Bortle 40412.630 24757 +0.010 18 J. Bortle 40418.622 24768 +0.011 14 J. Bortle 40455.648 24836 +0.002 14 R. Monske 40456.733 24838 -0.001 15 R. Monske 40468.727 24860 +0.011 14 M. Baldwin 40473.623 24869 +0.006 9 L. Hazel 40491.603 24902 +0.013 10 J. Bortle 40528.632 24970 +0.008 11 M. Baldwin 40552.600 25014 +0.012 7 J. Bortle EK Cephei --------- 39706.741 159 +0.001 14 S. Cook XY Ceti ------- 39878.701 9454 -0.009 11 S. Cook RZ Comae Berenices ------------------ 40323.588 16207 +0.001 19 J. Bortle 40324.598 16210 -0.005 21 J. Bortle 40338.638 16251.5 -0.012 17 J. Bortle 40346.597 16275 -0.008 18 J. Bortle 40347.617 16278 -0.005 20 J. Bortle 40348.631 16281 -0.006 19 J. Bortle 40369.621 16343 -0.003 15 J. Bortle 40380.625 16375.5 -0.001 14 J. Bortle Y Cygni ------- 40093.767 10199 -0.154 8 M. Baldwin 40129.703 10211 -0.174 13 M. Baldwin 40150.696: 10218 -0.155: 7 T. Cragg 40156.693 10220 -0.151 14 M. Baldwin SW Cygni -------- 39640.669 1417 +0.066 20 L. Hazel 39704.708 1431 +0.084 25 L. Hazel 40079.715 1513 +0.105 16 L. Hazel 40454.685 1595 +0.089 12 L. Hazel ZZ Cygni -------- 39679.744 29497 -0.028 19 L. Hazel 39701.747 29532 -0.027 15 L. Hazel 39703.637 29535 -0.023 15 L. Hazel 39725.634 29570 -0.028 16 L. Hazel 39764.611 29632 -0.025 13 W. Lowder 39786.611 29667 -0.026 7 W. Lowder 39982.740 29979 -0.026 15 L. Hazel 40028.635 30052 -0.020 11 L. Hazel 40038.692 30068 -0.021 13 L. Hazel 40060.693 30103 -0.021 12 L. Hazel 40145.555 30238 -0.023 15 L. Hazel 40160.640 30262 -0.025 19 J. Bortle 40363.689 30585 -0.019 17 J. Bortle 40380.658 30612 -0.023 16 J. Bortle 40446.660 30717 -0.026 13 R. Monske 40456.720 30733 -0.024 13 R. Monske 40466.778 30749 -0.023 10 M. Baldwin 40471.802 30757 -0.029 12 M. Baldwin 40473.685 30760 -0.031 14 L. Hazel 40478.711 30768 -0.034 10 L. Hazel 40512.664 30822 -0.027 12 M. Baldwin 40524.611 30841 -0.024 12 L. Hazel BR Cygni -------- 40081.642 4970 +0.011 24 J. Bortle 40113.629 4994 +0.016 23 J. Bortle 40137.610 5012 +0.011 18 J. Bortle 40145.611 5018 +0.017 20 J. Bortle 40161.595 5030 +0.010 22 J. Bortle 40197.571 5057 +0.007 19 J. Bortle 40466.750 5259 +0.008 26 M. Baldwin 40470.751 5262 +0.012 23 M. Baldwin V477 Cygni ---------- 40525.613 3272 -0.007 10 L. Hazel W Delphini ---------- 40459.296 5) 4663 +0.099 26 M. Baldwin TT Delphini ------------ 40147.681 658 +0.026 10 M. Baldwin 40460.632 767 +0.028 22 D. Lucas TY Delphini ----------- 39701.717 9807 -0.005 17 M. Baldwin 39707.672 9812 -0.006 11 M. Baldwin 39757.698 9854 -0.008 11 M. Baldwin 40069.770 10116 -0.009 14 M. Baldwin 40081.672 10126 -0.018 15 L. Hazel 40087.626 10131 -0.020 12 L. Hazel 40112.655 10152 -0.004 19 J. Bortle 40118.613 10157 -0.002 19 J. Bortle 40143.598 10178 -0.030 11 L. Hazel 40411.631 10403 -0.001 14 J. Bortle 40443.788 10430 -0.003 18 M. Baldwin 40449.738 10435 -0.008 15 M. Baldwin YY Delphini ----------- 40455.728 1387 +0.013 15 R. Monske 40524.692 1474 -0.021 10 D. Lucas FZ Delphini ----------- 40094.746 11198 +0.004 15 M. Baldwin 40116.677 11226 +0.005 14 M. Baldwin 40145.650 11263 -0.001 12 D. Lucas 40156.616 11277 0.000 14 M. Baldwin 40416.640 11609 -0.003 11 D. Lucas 40466.771 11673 +0.003 18 M. Baldwin 40470.690 11678 +0.006 9 M. Baldwin Z Draconis ---------- 39686.685 4728 +0.001 19 M. Baldwin 39762.701 4784 0.000 20 M. Baldwin 39800.709 4812 0.000 16 M. Baldwin 39906.597 4890 +0.007 18 D. Livingston 39910.663 4893 +0.001 13 M. Baldwin 39918.804 4899 -0.003 23 M. Baldwin 39948.667 4921 -0.003 14 L. Hazel 39948.667 4921 -0.003 11 H. Blake 39948.669 4921 -0.001 17 F. Chapman 39948.670 4921 0.000 31 D. Livingston 39952.741 4924 -0.002 17 L. Hazel 39963.597 4932 -0.005 24 F. Chapman 39963.599 4932 -0.003 26 D. Livingston 39963.599 4932 -0.003 16 L. Hazel 40001.610 4960 -0.001 16 L. Hazel 40168.571 5083 -0.004 35 A. Dobkowski 40442.775 5285 -0.004 16 M. Baldwin 40457.709 5296 -0.001 14 M. Baldwin TW Draconis ----------- 40324.604 2293 -0.001 15 J. Bortle 40338.630 2298 -0.009 16 J. Bortle 40439.672 2334 -0.015 19 R. Monske TZ Draconis ----------- 40347.584 2813 -0.002 11 L. Hazel UZ Draconis ----------- 40363.607 6419 +0.007 13 J. Bortle 40376.650 6423 +0.005 15 J. Bortle 40513.632 6465 +0.012 19 J. Bortle 40557.650 6478.5 +0.003 17 M. Baldwin AI Draconis ----------- 39722.761 555 +0.007 14 S. Cook 40107.575 876 +0.002 16 J. Bortle 40108.768 877 -0.004 8 R. Nolthenius 40113.571 881 +0.004 19 J. Bortle 40113.571 881 +0.004 15 K. Simmons 40126.756: 892 +0.002: 10 R. Nolthenius 40313.779 1048 +0.011 18 R. Sweetsir 40337.752 1068 +0.007 16 R. Sweetsir 40427.653 1143 -0.003 21 J. Bortle 40439.643 1153 -0.001 15 R. Monske 40445.649 1158 +0.011 15 R. Monske 40469.620 1178 +0.005 16 R. Simkins 40469.622 1178 +0.007 14 K. Simmons YY Eridani ---------- 40200.638 20476.5 +0.001 19 J. Bortle 40208.679 20501.5 +0.004 18 J. Bortle 40232.624 20576 -0.002 18 J. Bortle 40233.586 20579 -0.004 19 J. Bortle 40237.613 20591.5 +0.004 19 J. Bortle 40556.691 21584 -0.003 11 M. Baldwin AS Eridani ---------- 40566.710 4515 -0.002 16 M. Baldwin RW Geminorum ------------ 40587.629 7777 +0.004 14 L. Hazel SX Geminorum ------------ 39922.607 15284 -0.011 14 L. Hazel 39948.577 15303 -0.011 15 L. Hazel This work is sponsored by the American Assiciation of Variable Star Observers, with the writer as program coordinator. The reductions were made by the writer except where otherwise noted. MARVIN E. BALDWIN AAVSO 187 Concord Ave. Cambridge, MA 02138, USA 1) Only the second half of the eclipse was observed. Data was fitted to observations of JD 2439701 to measure time of minimum. 2) Only the first half of the eclipse was observed. Data was fitted to M. Baldwin's observations of JD 2439701 to measure time of minimum. 3) Geocentric time of minimum determined by the observer. Heliocentric correction and O-C calculated by the writer. 4) In keeping with the introductory remarks only the linear elements were used in calculating the O-C residuals. 5) Time of minimum determined from observations of the last half of the eclipse of JD 2440449 and the first half of the eclipse of JD 2440468.