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IAUC 3375: 1979c; EK Tri AUSTRALIS

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IAUC number 

                                                  Circular No. 3375
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758


COMET BRADFIELD (1979c)
     The following additional precise positions have been obtained
by D. Herald, Kambah, near Canberra:

     1979 UT             R. A. (1950) Decl.         m1
     June 28.33583     8 38 45.78   + 3 13 56.6    10
          29.36200     8 39 01.31   + 4 23 25.6    11

     M. P. Candy, Perth Observatory, Bickley, provides the following
parabolic orbital elements, evidently based on the four Kambah
observations June 25-29, which leave residuals of up to +/- 5".  The
ephemeris, extended at the Central Bureau, suggests that the comet
will become observable from the northern hemisphere in early August
(R.A. ~ 8h, Decl. ~ +40o, m1 ~ 8-9), attain Decl. ~ +60o in early September
and pass opposition near Delta = 0.4 AU in mid-September (R.A. ~ 23h, Decl. ~
+40o, m1 ~ 10).

       T = 1979 July 23.405 ET   Peri. =  51.91
                                 Node  = 164.75    1950.0
       q = 0.3925 AU             Incl. = 134.89

     1979 ET     R. A. (1950) Decl.     Delta     r      m1
     June 26     8 37.98    + 0 32.8    1.180   0.794   10.4
     July  1     8 39.32    + 6 13.1
           6     8 39.26    +11 35.4    1.293   0.602    9.4
          11     8 31.23    +16 47.5

              m1 = 11.0 + 5 log Delta + 10 log r


EK TRIANGULI AUSTRALIS
     N. Vogt, European Southern Observatory, telexes that during a
recent bright outburst of this dwarf nova three pronounced peaks in
the lightcurve were observed, on June 20.1701, 20.2351 and 21.140:
(heliocentric) UT.  The shape of the lightcurve resembles that of
other dwarf novae of the SU UMa subgroup (e.g., VW Hyi and V436
Cen), showing periodic superhumps during sustained eruptions.  The
superhump period of EK TrA is 0.0645 day, and the hump amplitudes
are 0.24 magnitude in V and B and 0.22 magnitude in U (on June 20).
The observations were made photoelectrically with the 100-cm
telescope at La Silla.


1979 July 2                    (3375)              Brian G. Marsden

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