COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1040


                                  Konkoly Observatory
                                  Budapest
                                  1975 August 28



               PERIOD FOR BV 1634


    The discovery of BV 1634 was reported by B.S. Carter in
IBVS 994, where the type of variation was still undetermined.
This star occurs at an extreme corner of the Maria Mitchell 
Observatory plates on a Sagittarius region. We have made estimates 
of its brightness on over 500 plates taken with the 7.5-
inch Cooke triplet between 1957 and 1975. The variable appears
to be a typical Mira type, but it presumably has an unresolved
companion of about 13.5m pg.
    The composite light curve shown in the Figure is based
on the elements

              Max = JD 2436420+254 n.

     This represents 27 cycles with 9 observed maxima on the
Nantucket plates taken from JD 35695 through 42574, and one
early maximum found on a Harvard plate taken with the 8-inch
Bache telescope on JD. 29811.



                           MARIENNE HIBBERT
                           DORRIT HOFFLEIT
                       Maria Mitchell Observatory
                       Nantucket, Mass., U.S.A.


                       [FIGURE 1]