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IAUC 4269: 1986o; SU Tau

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IAUC number 

                                                  Circular No. 4269
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 617-495-7244/7440/7444


COMET URATA-NIIJIMA (1986o)
     T. Seki, Geisei, notes that his observations on Nov. 3 of the
object called 1986 UD on IAUC 4267 show a very faint and diffuse
coma surrounding a central condensation, and T. Urata (who discovered
the object on exposures at Ojima by T. Niijima using a 0.30-m
f/5.8 reflector) now confirms the object's cometary nature.  Further
positions, also by K. Suzuki and T. Urata at Toyota, follow:

    1986 UT           R.A.   (1950.0)  Decl.    m1   Observer

    Oct. 30.60341    2 00 24.29   +18 53 27.5        Niijima
    Nov.  2.54340    1 54 57.47   +21 09 06.0   16   Suzuki
          2.56701    1 54 54.78   +21 10 13.2          "
          3.66354    1 52 51.27   +22 00 26.9   17   Seki
          3.67465    1 52 49.93   +22 00 59.2          "
          4.65000    1 51 00.03   +22 45 24.0   16     "
          4.70069    1 50 54.43   +22 47 37.0          "

     Parabolic orbital elements from 9 observations Oct. 30-Nov. 4:

          T = 1986 Nov. 20.472 ET  Peri. =  18.343
                                   Node  =  31.778   1950.0
          q =   1.63859 AU         Incl. =  32.982

     1986 ET     R.A. (1950.0) Decl.      p        r       m1

     Oct. 22     2 15.22    +12 20.6
          27     2 06.87    +16 07.0    0.678    1.671    16.4
     Nov.  1     1 57.83    +19 58.1
           6     1 48.48    +23 46.3    0.672    1.650    16.3
          11     1 39.23    +27 25.0
          16     1 30.53    +30 48.7    0.699    1.640    16.4
          21     1 22.76    +33 54.3
          26     1 16.23    +36 40.7    0.754    1.640    16.5


SU TAURI
     J. Mattei, AAVSO, reports that this R CrB-type star, which
last had a fading from 1982 Nov. to 1983 Dec., has started another
decline.  Visual magnitude estimates: Oct. 26.34 UT, 10.2 (P.
Collins, Tucson, AZ); 27.18, 10.4 (K. Medway, Southampton,
England); 28.40, 10.3 (Collins); 30.23, 10.5 (E. Mayer, Barberton,
OH); 31.42, 10.8 (Collins); Nov. 2.04, 10.8 (Medway); 2.44, 10.7
(R. Hays, Worth, IL); 3.36, 10.9 (J. Griese, Stamford, CT).


1986 November 5                (4269)              Brian G. Marsden

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