COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                      Number 1396

                                    Konkoly Observatory
                                    Budapest
                                    1978 March 22




                      KO Aur


   KO Aur = Wr 122 = BD +48d1340 was discovered by Weber, R. in
1963. He classified this star as an eclipsing binary (1). Weber
also gives the first elements obtaining a period of 0.428949d (2).
   I observed the star on 117 plates of the Hartha sky-patrol
(JD.2437300-38800) and searched on Sonneberg sky-patrol plates.
   The obtained minima, listed below, show that the elements of
Weber are not correct.
   The following improved elements could be derived: 
      Min.(hel.) = JD.2436607.472+ 1.31793028d E.
Observed minima:

JD.(hel.)             Epoch    O-C

2435762.655          - 641    -0.024d
  36607.450              0    - .022
  37639.459          + 783    + .048
    730.356            852    + .007 
    940.545           1011.5  - .013
  38406.478           1365    + .031
    495.380           1432.5  - .027
    651.610           1551    + .028
    849.311           1701    + .040
  39070.627           1869    - .057
  40205.425           2730    + .003
  41592.495           3782.5  - .048
    689.379           3856    - .032
    957.556           4059.5  - .054
  42697.573           4621    - .055
    866.368           4749    + .045
    870.323           4752    + .046

   Using the improved elements the observations of Weber, R.
and Diethelm, R.(3) can be exhibited.
   KO Aur is an eclipsing binary (10.45m-11.30m ph). Comparison
stars are published in (1). The secondary minimum seems to be
of the same depth as the primary minimum.
   Further particulars will be published in "Mitteilungen der
Bruno-H.-Burgel-Sternwarte Hartha" Heft 12.





                       TH. BERTHOLD
                   Bruno-H.-Burgel-Sternwarte
                      DDR-7302,Hartha


References:
(1) Weber, R. 1963 Inf.Bull.Var.Stars No. 21
(2) Weber, R. 1964 Bulletin de la station astrophotographique
           de Mainterne No. 4 p. 15
(3) Diethelm, R. 1976 BBSAG Bull. 26