COMMISSION 27 OF THE I. A. U.
            INFORMATION BULLETIN ON VARIABLE STARS
                           Number 964

                                         Konkoly Observatory
                                         Budapest
                                         1975 February 17


        PHOTOELECTRIC MINIMA OF ER Ori AND XY Leo

     In the next tables four minima of two eclipsing binaries are
given. The photoelectric observations in V light were carried out
using the 40 cm refractor of the Teramo Observatory. The heliocentric 
times of the minima and the mean errors were obtained with
the method of Hertzsprung. In the third column (N) is reported the
number of the single observations used in computing the time of
minimum.

           J.D. hel.      m.e.      N     E          (O-C)
          (2400000+)
  ER Ori   42023.35162 +-0d.00002   15  13024.5    -0d.0185
           42030.55008     .00001   13  13041.5    -  .0179

     The comparison and check stars of ER Ori are BD -8deg1051 and
BD -8deg1056, respectively. (O-C)'s were computed  from the elements
of the "1973 Rocznik Astronomiczny".

                                    E^I     (O-C)^I     E^II     (O-C)^II
XY Leo  42051.61956  .00003   20  24131.0    0.1198    23117.0    0.0329
        42099.48964  .00001   27  24299.5     .1175    23285.5     .0320

     The comparison star is BD 18deg2306. The E^I and (O-C)^I have
been computed from the elements of Koch (1960); the E^II and (O-C)^II
from those of Tempesti - De Carlo (1968), since the "1973 Rocznik
Astronomiczny" gives, the initial epoch of Koch and the period of
Tempesti - De Carlo.


Teramo Astronomical Observatory
I - 64100 Teramo

                                            R. BURCHI
                                            F. ZAVATTI

References:
Koch R.H., 1960, Astron.Journ. 65, 374 [BIBCODE 1960AJ.....65..374K ]
Tempesti P., De Carlo R., 1968, Note e Comunicazioni dell'Osservatorio
                                di Teramo n. 45