COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 2402

                                      Konkoly Observatory
                                      Budapest
                                      20 September 1983

                                      HU ISSN 0374-0676


            A NEW RR - TYPE VARIABLE IN LEO


  On about 210 photographs taken from 1978 to 1983, centered at Omicron
Leonis, a new RR type variable was found. Two cameras of focal lengths 50
and 85 cm were used with Tri-X emulsion and yellow-green filter which give
the brightness very close to visual magnitude. The position of the star is
measured as

          alpha : 9h40m21s  delta : +10d32.6' (1950.0)

 The derived elements of the variable are as follows:

    Max. = J.D. 244 3877.25 (+-0.01d) + 0.402132d (+0.000002d) * E.

The mean light curve in 1982/83 season is shown in Figure 1. The type is
apparently RRa, and the amplitude is 12.6m-13.7m(v).


                           [FIGURE 1]

 Figure 1. The mean light curve in 1982/83 observational season


  The change of period is examined using the mean light curves for each 
observational season, but no change could be recognized in this relatively
short observational. period, having no O-C's larger than 0.02d.
  The finding chart is shown in Figure 2.


                            [FIGURE 2]

                      Figure 2. Finding chart




                 MASAAKI HURUHATA
                 Hodozawa 88,
                 Gotemba-shi,
                 412 Japan