COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                      NUMBER 888   


                                   Konkoly Observatory
                                   Budapest
                                   1974 May 16

                      UZ OCTANTIS



   The variability of UZ Oct (BV 421 = CoD -85d47 = CPD -85d55)
was announced by Strohmeier (IBVS 51, 1964), who also gave the
first photographic light elements (IBVS 54, 1964); Kohler and
Schoffel (IBVS 91, 1965) proved the star to be a W UMa system
instead of an RRc type variable as previously believed; also they
published times of minimum light and the corresponding light 
elements. In this note we present times of minimum derived from 431
photoelectric UBV observations made at the Bosque Alegre station
of Cordoba Observatory with the 1.54 m reflecting telescope. 
Individual minima are listed in Table I together with the older 
photographic ones; they were used to determine the following least 
square linear ephemeris:

      Min. I = JD hel. 2440223.1560 + 1.1493709d * E
                           +/-.0084 +/-.0000053

Weights (W) in Table I were given according to the quality and 
number of the observations for each color; weight unity was assigned
to the photographic observations.

   Using only the photoelectric minima we found:

      Min. I = JD hel. 2442064.44803 + 1.1493549d * E
                           +/-.00022 +/-.0000055

the primed values in Table I correspond to these elements.
   The observations of the system will be completed in the next
observing season; the 431 complete UBV observations at present 
cover well the primary minimum (~12 observations per normal point),
however, secondary minimum and the maxima are not so well covered.
The following depths were found in relation to the comparison star
(CoD -85d49)
   Primary minimum: DeltaV = +0.065m, DeltaB = +0.110m, DeltaU = +0.295m
   Secondary minimum: DeltaV = +0.005m, DeltaB = +0.035m, DeltaU = +0.225m
and the light at maxima: DeltaV = -0.460m, DeltaB = -0.445m, DeltaU = -0.250m
   Secondary minimum shows constant light during an interval of
about 90 minutes indicating it to be an occultation, while primary
minimum shows the effects of a slightly curved transit.

                         Times of minimum
Color   JD hel.         E      W   (O - C)   E'     W'   (O - C)'
        2400000+
Pg      38316.323    -1659.0   1   -0.027
        38374.356    -1608.5   1   -0.037
        38374.401    -1608.5   1   +0.008
        38408.324    -1579.0   1   +0.025
        38427.279    -1562.5   1   +0.015
        38435.314    -1555.5   1   +0.004
        38439.312    -1552.0   1   -0.020
        38439.356    -1552.0   1   +0.024
        38440.449    -1551.0   1   +0.033
        38443.353    -1548.5   1   -0.002
Pg      38443.398    -1548.5   1   +0.043
V       42005.8333   +1551.0   2   +0.0031   -51.0   1    +0.0024
B       42005.8326   +1551.0   2   +0.0024   -51.0   1    +0.0017
U       42005.8326   +1551.0   2   +0.0024   -51.0   1    +0.0017
V       42011.5775   +1556.0   2   +0.0004   -46.0   1    -0.0002
B       4Z011.5779   +1556.0   2   +0.0008   -46.0   1    +0.0002
U       42011.5777   +1556.0   2   +0.0006   -46.0   1     0.0000
V       42012.7270   +1557.0   3   +0.0005   -45.0   2    -0.0001
B       42012.7269   +1557.0   3   +0.0004   -45.0   2    -0.0002
U       42012.7262   +1557.0   3   -0.0003   -45.0   2    -0.0009
V       42066.7461   +1604.0   3   -0.0008   + 2.0   2    -0.0006
B       42066.7462   +1604.0   3   -0.0007   + 2.0   2    -0.0005
U       42066.7469   +1604.0   3    0.0000   + 2.0   2    +0.0002
V       42067.8942   +1605.0   2   -0.0021   + 3.0   1    -0.0019
B       42067.8942   +1605.0   2   -0.0021   + 3.0   1    -0.0019
U       42067.8942   +1605.0   2   -0.0021   + 3.0   1    -0.0019
V       42123.6396   +1653.5   3   -0.0012   +51.5   2    -0.0002
B       42123.6412   +1653.5   3   +0.0004   +51.5   2    +0.0014
U       42123.6407   +1653.5   3   -0.0001   +51.5   2    +0.0009



Cordoba, 7 May 1974.





                       M.E. CASTORE DE SISTERO
                       R.F. SISTERO
                       Observatorio de Cordoba
                       Laprida 854
                       Cordoba, Argentina.