COMMISSION 27 OF THE I. A. U.
           INFORMATION BULLETIN ON VARIABLE STARS
                        NUMBER 840


	                                Konkoly Observatory
        	                        Budapest
                	                1973 October 25


	           A NEW U GEMINORUM STAR IN CANCER



    While searching for flare stars on the plates of the Praesepe
region taken by H.C. Chavushian at the Byurakan Astrophysical 
Observatory with the 40" Schmidt telescope on April 27, 1971, I found a
star which was 2.5 magn. brighter than on plates taken two days
before. The position of the object is

         RA = 8h33,4m ; Decl. = 21d31,5' (1950)

                      [FIGURE 1]

The figure presents the identification chart. Later on this object
has been examined on the Byurakan-plates taken in the years 1968,
1969, 1970 and 1971. Only on one of these plates was the star brighter 
than generally.
    During the survey-program for flare stars in the Praesepe 
region until 19 April 1973 the star has shown two more outbursts.

    Table 1 gives the data of observations.



	                    Table 1

No. of	     J.D.	m_pg		m_u		Notes			Observer
outburst  244...			

1.        0326.281   	15.1    	-      	multiple exp.plate with   	Erastova
                                     			10 images
          1066.221   	17.5    	-      	multiple exp_. plates     	Chavushian
          067.231    	17.5    	-
2.        069.263    	14.9
          070.249   	15.0
          1692.391    	 -             16.3 	multiple exp.               	Jankovics
          713.347     	 -             12.6
          715.270    	13.1_B   	-
3.        716.361    	13.8_B	       13.1
          719.326    	14.9_B	       13.6
          720.340    	14.2_B	       13.7
          723.350    	14.7_B 	      (13.6)
          724.384    	14.9_B	       14.4
          733.172    	17.6_B	       16.3
         1792.211      ~17.5     	-      	multiple exp. plates      	Jankovics 
4.        794.246    	15.0    	-



The approximate magnitude and colours of the variable at minimum
are B = 17,6; B-V = +0,2; U-B = -1,3. The star has been observed at
maximum or near the maximum only four times, but nevertheless there
are strong indications, that the variable may be an explosive 
variable of U Geminorum type with a period not longer than three months.





                             I. JANKOVICS
                          Byurakan Observatory,
                           on leave from the
                           Konkoly Observatory