COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1143

                                 Konkoly Observatory
                                 Budapest
                                 1976 June 18




       PHOTOELECTRIC MINIMA OF ECLIPSING VARIABLES




   The following list contains minima of eclipsing variables 
observed at the "P. Pizzinato" Observatory of Tignano, near Bologna.
All are photoelectric timings reduced using the Kwee and Van
Woerden method.
   The observations were made with the 400 mm diam., f=200 cm 
newtonian reflector and a photometer employing an unrefrigerated
IP21 photomultiplier tube.
   Column "(O-C)I" was determined with elements given in "Rocznik
Astronomiczny Observatorium Krakowskiego" while "(O-C)2" is 
referred to Cester's (1973) elements for W UMa. Column "N" denotes
the number of observations. All are heliocentric minima and 
column "m.e." denotes the mean errors obtained by the above-mentioned 
method.

Star      Filter   J.D. hel     m.e.      (O-C)1     (O-C)2    N
                   2442...
RT And      V      317.3611   +-0.0003   +0.1233              33
VW Cep      V      336.3769      .0003   -0.0172              52
VW Cep      V      353.3802      .0003   +0.0089              48
SW Lac      V      768.2821      .0001   -0.0469              29
W UMa       V      805.3714      .0004   -0.0081    -0.0012   54
W UMa       V      829.3935      .0004   -0.0080    -0.0011   64
W UMa       V      830.3940      .0001   -0.0084    -0.0015   51
W UMa       V      834.3978      .0003   -0.0083    -0.0014   47
W UMa       V      835.3990      .0002   -0.0080    -0.0011   34
W UMa       B      835.3990      .0002   -0.0080    -0.0011   34
W UMa       V      838.4018      .0001   -0.0079    -0.0010   41
W UMa       V      839.4035      .0005   -0.0071    -0.0002   72

Note: The new period of W UMa suggested by Cester (1976) is 
confirmed.

                      L. BALDINELLI, S. GHEDINI
                    Associazione Astrofili Bolognesi
                    Montebello 4-40121 Bologna, Italy

References:

Cester, B., Pucillo, M., 1973, Mem.SAIt, 64, 201 [BIBCODE 1973MmSAI..44..201C ]
Baldinelli, L., Ghedini, S., Turbertini, C., 1975, Giornale AAB, 39, 3
Cester, B., and collaborators, 1976, I.B.V.S., No. 1114