COMMISSION 27 OF THE I.A.U.
               INFORMATION BULLETIN ON VARIABLE STARS
                            Number 1479

                                                      Konkoly Observatory
                                                      Budapest
                                                      1978 September 28


             TWENTY LONG-PERIOD VARIABLES

The twenty Mira or SR type variable stars listed in Table I
have been examined on Nantucket plates to ascertain if any of
them have changing periods. The arrangement in the table is by
right ascension. The periods given in the General Catalogue of
Variable Stars for the named variables in Sagittarius had been
obtained from Harvard plates spanning the interval 1924-1953. The
new period-determinations have incorporated these earlier observations. 
None of the periods has changed significantly in the interval 
indicated in the penultimate column; the new periods are
simply improvements over the previous values and they satisfy
the old observations as well as the new.
   The initials in the final column indicate who determined the
new periods: SB, Sara Beck; DC, Deborah Crocker; DH, Dorrit Hoffleit;
SS, Stephen Sands; and WW, Wendy Whiting.
   This work was accomplished under a welcome grant from the
U.S. National Science Foundation, No. AST78-07405.


                               DORRIT HOFFLEIT

                               Maria Mitchell Observatory
                               Nantucket, Mass. 02554,
                               U.S.A.


                   Table I.

         Long Period Tested for Changes

Variable     JDo       Periods       Time Span  Comp.
                    GCVS     New

V1671 Sgr   39030    191     190.5   1924-1978   DC
V1672       43750    235     236       "   "     DH
V1674       43310    195     Same      "   "     DC
New A*      43330    ---     283     1957-1978   SB
V1676 Sgr   41140    256     257     1924-1978   SB
V1677       41950    238     239       "   "     DH
V1678       42650    213     212       "   "     SB
V1679       42330    292     Same      "   "     DC
V1681       41100    223     222       "   "     SB
V1682       42310    192.25  Same      "   "     SB
V1685       43350    266     Same      "   "     DH
V1687       43375    186     186.3     "   "     DH
V1688       42250    320     321       "   "     SB
V1690       42580    291     Same      "   "     DH
New B*      42275    -       232     1957-1978   SB
AA Sct      43700    153     263     1926-1978   WW
AP Sct      42960    104.6   Same      "   "     WW
V540 Cyg    43250    -       361     1930-1978   SS
FP Lyr      43370    270:    278       "   "     DC
CSV4713     43380    -       187.5     "   "     SS

A, Discovered by Sara Beck at 18h25m26s - 26d42.8', 13.0-[15.2pg
B,    "       "   "    "    " 18 30 31  - 25 29.5,  14.6-[16.1