COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 1200 Konkoly Observatory Budapest 1976 November 5 PHOTOELECTRIC MINIMA OF ECLIPSING VARIABLES The photoelectric minima of eclipsing binaries listed below were observed with the 60 cm reflector of the Konkoly Observatory (with one exception). The observations were made with an EMI 9502B type photomultiplier (unrefrigerated) combined with 2 mm UG1; 1 mm BG12 + 2 mm GG13, and 2 mm GG11 filters. Linear elements given in the Second (II) and Third (III) Supplements of the 1969 General Catalogue of Variable Stars were used for computing the O-C values. N denotes the number of observations (each consisting of six individual measurements). Star J.D. hel O-C_II O-C_III N Colour Remark U Peg 2442347.3879 -.0007 24 B,V 2442741.2810 -.0028 52 B,V VW Cep 2442679.4272 -.0035 36 B,V Min. II 2442680.3996 -.0052 48 B,V 2442693.4799 -.0058 60 U,B,V 2442989.4692 -.0057 38 B,V Min. II AB Cas 2442714.4627 -.0056 64 B,V RT Per 2442742.3944 +.0002 40 B,V 2442743.2445 +.0009 26 B,V TW Cas 2442742.5460 -.0003 54 U,B,V 2442775.3942 -.0035 56 U,B,V VV UMa 2442815.6107 -.0017 76 B,V 2442831.4191* -.0028 51 U,B,V 2442840.3562 -.0016 42 B,V SW Lyn 2442786.4493 +.0005 62 B,V RW CrB 2442908.4455 -.0001 25 B,V * Observed with the 1 m RCC telescope of the Konkoly Observatory. L. PATKOS Konkoly Observatory Budapest