NNo       GCVS          J2000.0        Type       Max       Min I        Min II      Epoch(JD24..) Year        Period        M-m/D    Spectrum       References  Other design. 
------------------------------------------------------------------------------------------------------------------------------------------------------------------
710171 |FG    Sge *|201156.1+202004 |*         |  9.45   |  13.6      |            |B |            |     |                    |     |B4Ieq-K2Ib       |09717 05665|
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______________The positional information: ___________________________
  NNo     GCVS            J2000.0         p.m.(as/yr) Epoch     Ident.
----------------------------------------------------------------------
710171 |FG    Sge |201156.06 +202004.4 |+0.000 -0.009|2000.0  | |Hip
----------------------------------------------------------------------


_______________Cross-identifications:_______________
FG    Sge     = AN   1943.0377                |     
FG    Sge     = GSC  1626.00619               |     
FG    Sge     = He   2-457                    |     
FG    Sge     = He   3-1844                   |     
FG    Sge     = Hip  099527                   |     
FG    Sge     = IRAS 20097+2010               |     
FG    Sge     = S    03702                    |     
____________________________________________________

      Reference to a chart or photograph:
05665. G.H.Herbig, A.A.Boyarchuk, ApJ 153, 397, 1968.

      Reference to a study of the star:
09717. V.P.Arkhipova, Perem Zvezdy 21, N5, 617, 1982.

__________________________________________________________________
      Remark:         
    VB A (B 14.2m, 8", 100deg). The central star of the
    planetry nebula PK 60deg (diameter 36", the age about 6000
    years). The brightness of the star steadily increased from
    13.6 pg in 1894 to the maximum in 1967, and then is
    steadily decreasing. In 1982 it was 11.0 B. In 1967 the
    strong absorption lines of rare earth elements appeared
    in the spectrum. The spectral class steadily becomes
    later. The signes of new planetary nebula ejection were
    observed. In 1962 the star entered the instability
    strip in the Mv, B-V diagram and began to pulsate
    with a small amplitude and increasing period: Min(V) =
    2442629 + 59.83d*E + 1.126d*E**2 (JD2442600 - 44530).
    In twenty years the period increased from 50d to 134d,
    the amplitude of pulsations changed from 0.2mV to 0.5mV;
    now it decreased again to 0.2mV, and the period is only
    90d [09780].

----The End----