COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 299 Konkoly Observatory Budapest 1968 September 12 MINIMA OF ECLIPSING VARIABLES This report continues the one in IBVS 187, and contains 90 observed minima of 12 eclipsing variable stars. All are visual (v) and photographic (pg) estimates reduced by the tracing-paper method and by fitting the observations to the mean light curve unless otherwise specified. Elements in the General Catalogue of Variable Stars were used to compute O-C's for YY Del, Z Dra, and RW Tau, and for the others the author's elements given below were used. The number of estimates is given under n. J.D.hel. O-C E n (2430000) XZ Andromedae^1) 6609,3259 pg +0,^d0085 97 8 6822,4148 " +0,0022 254 8 6830,5590 " +0,0027 260 14 6898,4231 " +0,0020 310 13 7149,5247 " +0,0041 495 14 7164,4507 " -0,0001 506 11 7172,5959 " +0,0014 512 13 7183,4534 " +0,0005 520 11 7194,3133 " +0,0021 528 7 7198,3813 " -0,0018 531 6 7202,4560 " +0,0010 534 12 7202,4577 v +0,0027 534 21 7213,3260 " +0,0126 542 5 7236,3875 pg +0,0001 559 12 7240,4598 " +0,0005 562 10 7270,3238 " +0,0041 584 4 7506,4864 " -0,0026 758 10 7506,4956 v -0,0034 758 13 7514,6200 v -0,0127 764 4 7548,5610 v -0,0041 789 5 7555,3523 " +0,0007 794 14 7571,6357 pg -0,0034 806 7 7589,2820 v -0,0019 819 4 8258,4297 pg -0,0004 1312 12 8258,4260 v -0,0041 1312 7 8296,4300 " -0,0043 1340 7 8638,4708 pg -0,0017 1592 9 8699,5491 " -0,0016 1637 6 9033,4340 v -0,0112 1883 9 9037,5120 " -0,0050 1886 13 9037,5229 pg +0,0059 1886 8 9356,4830 " +0,0018 2121 7 9367,3425 " +0,0029 2129 8 9675,4430 " -0,0024 2356 10 9709,3752 " -0,0026 2381 4 9713,4460 " -0,0036 2384 6 9781,3140 " -0,0004 2434 9 9785,3883 " +0,0014 2437 16 9808,4550 " -0,0053 2454 8 AB Cassiopeiae 9763,378 pg +0,007 10445 7 9778,413 " +0,006 10456 7 9785,247 " +0.006 10461 6 ZZ Cygni 9666,5395 pg -0,0061 29476 6 9668,4260 " -0,0054 29479 6 9675,3395 " -0,0067 29490 8 9680,3685 " -0,0065 29498 8 TT Delphini 4583,449 pg +0,006 1371 10 4962,432 " +0,003 1503 9 4985,405 " +0,007 1511 4 4988,277 " +0,008 1512 5 5005,492 " -0,003 1518 5 5011,240 " +0,002 1520 4 5700,297 " -0,006 1760 6 7520,570 " -0,015 2394 12 7546,431 " +0,006 2403 17 8967,627 " +0,004 2898 17 9682,533 " +0,004 3147 11 9708,366 " -0,003 3156 6 YY Delphini 9291,470 pg +0,044 17017 12 9341,429 " +0,039 17080 11 9391,392 " +0,038 17143 12 9403,289 " +0,038 17158 15 Z Draconis 9571,296 pg +0,006 4643 9 9617,450 " +0,007 4677 11 9670,387 " +0,004 4716 6 9674,463 " +0,008 4719 7 9708,399 " +0,008 4744 8 RZ Draconis 39666,443 pg -0,005 18548 13 39667,550 " +0,001 18550 4 TU Herculis 39620,527 pg -0,021 952 5 39654,525 " -0,028 967 6 39670,400 " -0,021 974 7 39686,268 " -0,022 981 10 39763,345 " -0,022 1015 8 CC Herculis 39621,523 pg -0,010 7786 15 39654,467 v -0,012 7805 16 39668,342 pg -0,009 7813 10 39680,483 " -0,006 7820 12 39713,423 " -0,011 7839 6 40013,4085 " -0.0053 8012 11 40039,4175 " -0,0061 8027 7 40046,3534 " -0,0062 8031 15 40065,4275 " -0,0059 8042 10 RT Persei^2) 39781,385 pg -0,015 7472 10 39810,262 " -0,017 7506 15 RW Tauri 39022,390 pg +0,012 1661 14 39404,487 " +0,011 1799 11 X Trianguli 39709,5820 pg +0,0103 17485 8 39784,3815 " +0,0018 17562 16 39786,3315 " +0,0087 17564 20 Notes: Elements not contained in the GCVS: XZ And 2436477,6598+1,^d3572944*E AB Cas 2425486,350 +1,3668761*E ZZ Cyg 2421137,4377+0,62861764*E -2,^d961*10^-11*E^2 TT Del 2430647,155 +2,871107*E RZ Dra 2429448,787 +0,55087668*E TU Her 2437462,3909+2,2669718*E CC Her 2426120,718 +1,733986*E RT Per 2433434,6624+0,84940272*E X Tri 2422722,3107+0,97153337*E 1) Studii si Cercetari de Astronomie vol. 12 (1967) nr. 1, p. 47 2) Acta Astronimica vol. 18 (1968) nr. 1, p. 62 IOAN TODORAN Astronomical Observatory Cluj, Rumania