COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                      NUMBER 507
                     		 	Konkoly Observatory
                       			Budapest
                       			1971 January 18



       A NEW ECLIPSING BINARY IN SAGITTARIUS


      An eclipsing binary at 18h 01m 25s and -28d 25.1'
was discovered at the Maria Mitchell Observatory using the
positive-negative method. Approximately 800 Nantucket and
Harvard plates taken between JD 2425847 and D 2440815 were
used to determine the period, MIN = 2430094.536 + 30.636 N
satisfied all of the observations (Figure 1). The duration
of the eclipse is 1.225 days. No secondary minimum was 
observed. The star is magnitude 10.9 (pg.) at maximum and
14.1 during an eclipse, The magnitudes were derived from
Harvard-Groningen Selected Area 158 and the Harvard variable
star sequences in VSF 193.

      I am indebted to the U.S. National Science Foundation 
for the grant to the Maria Mitchell Observatory supporting 
this work.



January 8, 1971   	   	MARCIA J. KEYES
                 	  	Nantucket, Massachusetts


                    [FIGURE 1]