COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                   Number 2156

                                Konkoly Observatory
                                Budapest
                                1982 June 3

                                HU ISSN 0374-0676



      NEW PHOTOELECTRIC TIMES OF MINIMA OF W URSAE MAJORIS





  Using the 75 cm telescope of the Wilhelm Foerster Observatory Berlin,
we observed W UMa during 12 nights between 1976 and 1982. The telescope is
equipped with a single channel, uncooled photometer with an 1P21 
photomultiplier, usual UBV filters and a conventional DC amplifier. As 
comparison stars, we used AGK_3 +55d696 and +56d764. We determined 9 
times of minima from
our measurements by the Pogson method, they are given in Table I, n is the





                   Table I

               Heliocentric Times of Minima of W UMa

Jul. Date_hel      m.e.       n        O-C    Colour   Remarks

24 42816.5501d +-0.0014d   54\                V        Min.II
   42816.5494     .0014    49/    -0.0036d    B        "
   42840.5708     .0008   147     .0045       V        "
   43559.3948     .0009   136     .0034       V
   43604.4370     .0008   102     .0023       V
   43608.4378     .0007   101\                V
   43608.4390     .0013    77/    .0046       B
   43930.4012     .0005    93     .0024       V
   44691.4269     .0010    65\                V
   44691.4267     .0006    62/    .0049       B
   45020.3929     .0021    13 \               V
   45020.3922     .0014    13 /   .0061       B
   45061.4291     .0007    88\                V
   45061.4311     .0010    88/    .0060       B


number of individual measurements. The O-C values are calculated with
Rigterink's elements (1972).





            U. HOPP, S. WITZIGMANN, M. KIEHL
            Wilhelm Foerster Observatory
            Munsterdamm 90
            D 1000 Berlin 41, FRG





Reference:

Rigterink, P.V.: 1972, Astron. J. 77. 230 [BIBCODE 1972AJ.....77..230R ]