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IAUC 3524: SU Tau; 1980l

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                                                  Circular No. 3524
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


SU TAURI
     J. Mattei, AAVSO, informs us that recent observations indicate
that this R-CrB variable, at minimum for almost one year (cf. IAUC
3407), is now brightening.  Visual magnitude estimates: Aug. 24.5
UT, 14.3 (R. Annal, Barstow, CA); Sept. 11.3, 13.7 (C. Scovil,
Stamford, CT); 18.5, 13.0 (J. Morgan, Prescott, AZ); 19.3, 13.1 (J.
Bortle, Stormville, NY); 20.5, 12.8 (Morgan); 23.5, 12.8 (Morgan);
30.5, 12.5 (Morgan).


COMET RUSSELL (1980l)
     K. S. Russell, U.K. Schmidt Telescope Unit, communicates
further positions, from exposures by A. Savage and M. Hartley:

     1980 UT             R. A. (1950) Decl.
     Sept.15.77130     3 03 11.39   -40 53 07.7
          15.78866     3 03 09.97   -40 53 43.0
          16.74791     3 01 44.44   -41 31 45.4
          19.76425     2 56 46.89   -43 32 26.6
          19.78161     2 56 45.44   -43 33 02.7
     Oct.  1.63321     2 29 10.74   -51 20 44.7

     Improved parabo1ic elements by the undersigned:

       T = 1981 Mar. 6.169 ET    Peri. = 297.106
                                 Node  = 232.066   1950.0
       q =  2.11475 AU           Incl. = 128.696

     1980/81 ET  R. A. (1950) Decl.     Delta     r      m1
     Sept.28     2 39.16    -49 00.7
     Oct.  8     2 07.97    -55 09.6    2.122   2.727   16.5
          18     1 24.76    -60 00.4
          28     0 32.46    -62 55.3    2.199   2.592   T6.3
     Nov.  7    23 39.59    -63 48.0
          17    22 55.07    -63 07.0    2.394   2.469   16.3
          27    22 22.30    -61 33.9
     Dec.  7    22 00.08    -59 40.8    2.618   2.359   16.3
          17    21 45.81    -57 46.8
          27    21 37.09    -56 01.7    2.799   2.266   16.3
     Jan.  6    21 32.15    -54 29.6
          16    21 29.73    -53 12.8    2.891   2.193   16.2


1980 October 8                 (3524)              Brian G. Marsden

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