COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 425

                                Konkoly Observatory
                                Budapest
                                1970 March 31


         PHOTOGRAPHIC OBSERVATIONS OF UV Ceti
             (October, 3-18, 1969)

      According to the program published in the Inf.Bull.
IAU Comm. 27 (1) photographic observations of UV Ceti have
been carried out at Abastumani Astrophysical Observatory
from 3- to 18 October 1969. Through the use of a special
automatic camera adjusted at the primary focus of the telescope 
almost continuous photography of the star was performed.
      The photographs were obtained on KH-3 film without
a filter, the exposures, in most cases, being 4 minutes.
Time intervals are given in the table below, when continuous
observations were carried out over 9 nights.



  8.10.69       19h53m-21h48m           13.10.69        00h00m-00h24m
                22 06 -22 46            14.10           19 00 -24 00
  9.10          19 10 -20 22            15.10           00 00 -01 04 
 10.10          18 58 -24 00                            18 53 -24 00   
 11.10          00 00 -01 04            16.10           00 00 -01 00 
                19 28 -21 32                            19 00 -24 00
                21 54 -22 12            17.10           00 00 -00 58
 12.10          19 00 -20 00                            19 22 -24 00
                20 09 -24 00            18.10           00 00 -00 34


      The total length of continuous observations amounts
to 40h51m. More than 600 photonegatives are obtained, A
flash at 23h38m ((U.T.), 12 October with an amplitude about 0.3
magn. and a flare at 22h06m, 16 October with an amplitude
of about 1 magn. have been fixed.
      Mean moments of exposure are indicated here, for
the cases of greatest brightness. Microphotometry of the
photographs, obtained at the moments near to flares, has
been done.
       The comparison stars were used from (2). The results
of microphotometric estimations of magnitudes are given in
table and on the diagram (see figure).

			[FIGURE 1]


         16.10.1969                     12.10.1969

No      U.T.    m_pv              No      U.T.    m_pv

 1    21h54m   12.68m              1    23h26m   12.46m
 2    21 58    12.69               2    23 30    12.44
 3    22 02    12.58               3    23 34    12.26 
 4    22 06    11.61               4    23 38    12.14
 5    22 10    12.18               5    23 42    12.21
 6    22 14    11.99               6    23 46    12.20
 7    22 18    11.91               7    23 50    12.24
 8    22 22    12.14               8    23 54    12.26
 9    22 26    12.22               9    23 58    12.43
10    22 30    12.23
11    22 34    12.35

 Mean square error of one estimation equals to +-0.05m.

References

1. A.D. Andrews, P.F. Chugainov, V.S. Oskanian
  Comm.27, IAU Inf.Bull.Var.Stars, 1968, No.318
2. W.J. Luyten, AphJ 109, 532, 1949. [BIBCODE 1949ApJ...109..532L ]

                           L. N. MOSIDZE
                           A. D. CHUADZE