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IAUC 3438: 1979l; V711 Tau

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IAUC number 

                                                  Circular No. 3438
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 (1979l)
     M. P. Candy, Perth Observatory, Bickley, provides the following
parabolic orbital elements satisfying three observations over a
2-day arc with residuals < 1":

       T = 1979 Dec. 21.488 ET   Peri. = 257.98
                                 Node  = 102.67    1950.0
       q = 0.5382 AU             Incl. = 148.51

     The ephemeris, extended at the Central Bureau, suggests that
the comet may still be as bright as m1 ~ 5 when it becomes
observable from the northern hemisphere at the end of January.

     1979/80 ET  R. A. (1950) Decl.     Delta     r      m1
     Dec. 25    16 18.73    -35 23.5    1.194   0.544    5.2
          27    16 15.96    -36 14.0
          29    16 13.50    -37 07.8    1.063   0.566    5.2
          31    16 11.40    -38 06.1
     Jan.  2    16 09.73    -39 10.5    0.924   0.601    5.1
           4    16 08.56    -40 23.1
           6    16 07.97    -41 46.7    0.779   0.646    5.1
           8    16 08.12    -43 25.2
          10    16 09.21    -45 24.2    0.633   0.699    4.9
          12    16 11.61    -47 52.0
          14    16 16.04    -51 01.0    0.487   0.757    4.7

             m1 = 7.5 + 5 log Delta + 10 log r


V711 TAURI
     E. F. Guinan, G. P. McCook and A. G. Weisenberger, Department
of Astronomy, Villanova University, write: "Photoelectric observations
at 658.5 nm made at Villanova University during Oct.-Dec. reveal
a major change in the nature of the lightcurve of V711 Tau =
HR 1099.  The amplitude has increased from 0.075 mag during 1977/78
to 0.130 mag, and the light minimum has shifted from phase 0.68 to
0.95 (using the ephemeris 1975 Dec. 19.569 UT + 2.83782E).  The
brightness at maximum now is 0.05 mag brighter than during 1977/78.
In addition, on 1979 Nov. 30.2 UT the system appeared to be flaring
and was observed to be 0.06 mag brighter than the mean 1979 lightcurve
with a significant enhancement in net H-alpha emission.  By Dec. 2
the star had returned to its previous level."


1979 December 31               (3438)              Daniel W. E. Green

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