COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     Number 325


                                   Konkoly Observatory
                                   Budapest
                                   1969 February 5


       VISUAL OBSERVATIONS OF YZ CANIS MINORIS

      The flare star, YZ CMi, was observed visually for
10 hours during the January 1969 international programme
using the Armagh 10-inch refractor. Estimates of brightness
were made at about one minute intervals using Pickering's
fractional method, and the photo-visual sequence given by
Mosidze and Chuadze (Ref.1) was utilized in the magnitude
reductions.
      One flare of 1.7 magnitude and 30 minute duration
was detected on Jan. 19 at 2h0.2m U.T. Extrapolation of the
sequence during the flare maximum was made using the star,
HD 62525, at 8.5m (Ref.2). A visual light curve of the flare
is shown, being the result of two independent observers
(A,P). Hours of coverage are given in the Table, where
parentheses indicate poor sky conditions.

              Hours of Coverage

1969              U.T.                Observers
Jan.14     2325 - 2400                  A,C,P
15         0000 - 0210,(0210 - 0303)    A,C,P
16         (2002 - 2020)                A,H,P
18         1945 - 2033,2048 - 2118,     A,C,J2,P
           2142 - 2219,2238 - 2311,     A,C,J2,P
           2315 - 2326,2332 - 2400      A,C,J2,P
19         0000 - 0251                  A,C,J2,P

Total coverage 9h56m over 3 nights


                   A.D. ANDREWS. P. CORVAN, B. HARDY,
                    P. and W. JOHNSTON, J. PERROTT
                        Armagh Observatory




1) L.N. Mosidze and A.D. Chuadze, Abastumani Obs. Bull. 32,
  p. 21, 1965.
2) A.J. Cannon and E.C. Pickering, Harvard Annals Vol. 93, 1919. [BIBCODE 1919AnHar..93....1C ]

     		   [FIGURE 1]