COMMISSION 27 OF THE I. A. U.
           INFORMATION BULLETIN ON VARIABLE STARS
                        Number 2595
                                           Konkoly Observatory
                                           Budapest
                                           28 September 1984

                                           HU ISSN 0374 - 0676


              PHOTOELECTRIC MINIMA TIMES OF ER ORIONIS

   The short period (P = 0.4234d) eclipsing binary ER Orionis was observed
photoelectrically during 1982 and 1983. The observations were made using the
two-beam, multi-mode, nebular-stellar photometer attached to the 48 inch
Cassegrain reflector at the Kryonerion Astronomical Station of the National
Observatory of Athens.
   During our observations six new minima times were obtained. They are
presented in the following Table, the successive columns of which give: the
Hel. J.D. of the six minima, the residuals (O-C), the mean error sigma and the
type of minimum.
                         Table I
Hel.J.D.      (O-C)       sigma    Min.
2440000+      days        days     Type

5310.4163     -0.0277   +-0.0003   I
5311.4771     -0.0244   +-0.0004   II
5312.3233     -0.0250   +-0.0004   II
5312.5322     -0.0278   +-0.0003   I
5380.2774     -0.0268   +-0.0003   I
5667.5369     -0.0248   +-0.0004   II

   The residuals (O-C) have been computed using Kukarkin's et al. (1976)
ephemeris formula:

      Min I = (Hel.J.D.) 2436508.7851 + 0.4234009d E
while the times of minima and the mean errors have been calculated using
Kwee and Van Woerden's method (1956).


      P. ROVITHIS                               H. ROVITHIS-LIVANIOU
      National Observatory                      Astronomy Department
      of Athens, Athens 11810                   Athens University
      Greece                                    Panepistimiopolis
                                                GR-157 71 Zografos
                                                Greece

References:

Kukarkin, B.V. et al., 1976, Third Suppl. to the third Edition of the General
   Catalogue of Variable Stars, Moscow. [BIBCODE 1976tstt.book.....K ]
Kwee, K.K., and Van Woerden, H., 1956, Bull. Astr. Inst. Neth., 12, 327. [BIBCODE 1956BAN....12..327K ]