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IAUC 4214: 1986e; 1986d; R CrB

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IAUC number 

                                                  Circular No. 4214
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 MACHHOLZ (1986e)
     Donald E. Machholz, San Jose, CA, reports his discovery of a
comet.  The following observations are available:

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

      May  12.453     0 40.8    +38 36     11.0    Machholz
           13.434     0 34.4    +39 15             Morris
           13.453     0 33.8    +39 16     10.8    Machholz
           13.476     0 34.2    +39 14      9.7    Morris

D. E. Machholz (Loma Prieta, CA).  29 x 130 binoculars.  Object
   diffuse without condensation, no tail.
C. S. Morris (near Mt. Wilson, CA).  0.25-m reflector.  Coma
   diameter 2'5, some condensation.  A visual estimate by A. Hale
   (same time and location, 0.20-m reflector) gave m1 = 9.8.


PERIODIC COMET SINGER BREWSTER (1986d)
     The following precise positions have been reported:

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

    May   8.30486   14 47 54.57   - 5 45 12.8        Tatum
          8.52307   14 47 48.71   - 5 42 59.8   16   Gilmore
          8.54280   14 47 48.34   - 5 42 48.4          "
          9.19961   14 47 30.17   - 5 36 51.4        Schwartz

J. B. Tatum (University of Victoria).
A. C. Gilmore and P. M. Kilmartin (Mount John Observatory).
G. Schwartz (Oak Ridge Observatory).  Measurer: C.-Y. Shao.

     Further computations confirm that this is a short-period
comet.  A close approach to Jupiter in 1976 is indicated.

          T = 1986 May 28.721 ET
      Peri. =  40.394                    e =   0.41372
      Node  = 192.916   1950.0           a =   3.32827 AU
      Incl. =   9.285                    n =   0.162322
          q =   1.95130 AU               P =   6.07 years


R CORONAE BOREALIS
     Visual magnitude estimates by R. Ducoty, Capitola, CA: Mar.
19.55 UT, 7.1; Apr. 8.43, 6.2.


1986 May 13                    (4214)              Brian G. Marsden

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