COMMISSIONS 27 AND 42 OF THE IAU
            INFORMATION BULLETIN ON VARIABLE STARS
                         Number 3885

                                            Konkoly Observatory
                                            Budapest
                                            27 May 1993

                                            HU ISSN 0374 - 0676


     NEW ELEMENTS OF THE SMALL AMPLITUDE CEPHEID V1726 Cyg


Variability of V1726 Cyg was discovered by Platais (1979), who determined the
elements:

         Max JD hel=2442884.996+4.2388d * E       (1)

Platais and Shugarov (1981) observed this star photoelectrically and improved
the elements:

         Max JD hel=2444105.39+4.2359d * E        (2)

Szabados (1991), having Berdnikov's (1986) photoelectric observations, derived
new elements:

         Max JD hel=2444105.697+4.236978d * E     (3)

Recently we have obtained new observations (Berdnikov, 1992a) of V1726 Cyg, and
now the time-base of the available photometric observations is sufficient for
improvement of the elements (3).  With this aim all above-mentioned
photoelectric observations have been analysed with Hertzsprung's method;
Berdnikov's (1992a) light curve served as the standard curve, and computer
version of this method (Berdnikov, 1992b) was used.  Moments of normal maxima in
filter V together with their errors are presented in Table 1; N is the number
of utilised observations.  On the base of this data, the following elements
have been derived (using the least squares method with weights being inversely
proportional to error squares):

        Max JD hel=2444105.214 + 4.2370487d * E        (4)
                       +-0.001 +-0.0000006

                    Table 1

Max JD hel   Error  N     E      O-C        Reference
2444105.214  0.019  33    0     0.000      Platais and Shugarov (1981)
2444622.075  0.039  22  358    -0.002      Berdnikov (1986)
2448511.744  0.018  21 1040     0.000      Berdnikov (1992a)

The corresponding epochs E and O-C residuals in Table 1 are calculated with
elements (4).



                          L. N. BERDNIKOV
                          Sternberg Astronomical Institute,
                          13, University Avenue,
                          Moscow 119899,
                          Russia,
                          Saratov University, Saratov,
                          Russia

References:

Berdnikov, L. N., 1986, Perem. Zvezdy, 22, 369 [BIBCODE 1986PZ.....22..369B ]
Berdnikov, L. N., 1992a, Pisma v Astron. Zh., 18, 325 [BIBCODE 1992SvAL...18..130B ]
Berdnikov, L. N., 1992b, Pisma v Astron. Zh., 18, 519 [BIBCODE 1992SvAL...18..207B ]
Platais, I., 1979, Astron. Tsirk., No. 1049, 4 [BIBCODE 1979ATsir1049....4P ]
Platais, I. and Shugarov, S., 1981, Inf. Bull. Var. Stars, No. 1982
Szabados, L., 1991, Commun. Konkoly Obs. Hung. Acad. Sci., Budapest, No. 96, 125 [BIBCODE 1991CoKon..96..123S ]
						[CoKon No. 96]