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IAUC 3562: 1980t; TT Ari

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IAUC number 

                                                  Circular No. 3562
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 (1980t)
     The following precise position has been measured by E. Bowell
from an exposure by B. Skiff with the 0.33-m photographic telescope
at the Lowell Observatory's Anderson Mesa Station:

     1981 UT             R. A. (1950) Decl.
     Jan.  9.07049    20 22 47.34   - 1 57 47.1

     The following parabolic orbital elements, by B. G. Marsden,
satisfy the six available accurate positions within 1":

       T = 1980 Dec. 29.5423 ET  Peri. = 358.2992
                                 Node  = 114.6596   1950.0
       q = 0.259779 AU           Incl. = 138.5893

     1981 ET     R. A. (1950) Decl.     Delta     r      m1
     Jan.  6    19 55.69    - 6 03.7    0.827   0.356    4.1
          11    20 35.66    - 0 11.3
          16    20 59.72    + 2 43.3    1.195   0.589    7.1
          21    21 15.96    + 4 20.7
          26    21 28.01    + 5 22.8    1.546   0.819    9.1
          31    21 37.60    + 6 07.5
     Feb.  5    21 45.60    + 6 43.2    1.850   1.034   10.5
          10    21 52.50    + 7 14.1
          15    21 58.58    + 7 42.4    2.108   1.234   11.5
          20    22 04.04    + 8 09.5
          25    22 08.98    + 8 35.9    2.325   1.424   12.4

     Selected visual estimates: Jan. 8.01 UT, m1 = 4.1, tail 3o.7
(C. Sherrod, North Little Rock, AR, 10 x 50 bin.); 8.96, m1 = 4.3,
coma 3'.5, tail 5o in p.a. 32o (J. Bortle, Stormville, NY, 10 x 50);
10.95, 5.3, 40' in 20o (D. W. E. Green, Cambridge, MA, 20 x 80).


TT ARIETIS
     D. A. Hanes, Anglo-Australian Observatory; and A. Schwarzenberg-Czerny
and J. A. J. Whelan, Institute of Astronomy, University of
Cambridge, report that this object (cf. IAUC 3541, 3552) was brighter
than B = 14 on 1980 Dec. 26.  The spectrum was then similar to one
obtained on 1980 Aug. 11, when TT Ari was at B ~ 11.5, although the
Balmer emission is possibly now stronger than last August.  An
improved position is R.A. = 2h04m09s.9, Decl. = +15o03'27" (equinox 1950.0).


1981 January 12                (3562)              Brian G. Marsden

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