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IAUC 2748: 1975a

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IAUC number 

                                                  Circular No. 2748
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS


COMET BOETHIN (1975a)
     The following precise positions have been reported:

     1975 UT             R. A. (1950) Decl.        m1    Observer
     Feb.  5.40417     1 13 24.15   +12 20 06.4   10     Urata
           5.40833     1 13 25.24   +12 20 14.3            "
           8.98704     1 29 03.83   +14 09 43.9          McCrosky
           9.06521     1 29 24.75   +14 11 59.4            "
           9.43233     1 31 01.59   +14 23 01.3    9     Saito
          10.74861     1 36 48.94   +15 01 45.7   13     Antal
          10.81250     1 37 05.40   +15 03 36.3            "

T. Urata (Nihondaira Observatory).  15-cm f/6 reflector.  From
   Nihondaira Obs. Circ. No. 631.
R. E. McCrosky (Harvard College Observatory, Agasslz Station).  The
   first position is with the 41-cm refractor, the second with the
   155-cm reflector.  Measurer: C. Y. Shao.
Saito and H. Kosai (Tokyo Astronomical Observatory).  Comet diffuse
   with condensation.  Communicated by K. Osawa.
M. Antal (Skalnate Pleso Observatory).  Comet diffuse without
   condensation.  Coma diameter 0'.7.  Poor observing conditions.

       The following preliminary parabolic elements, by the undersigned,
are based on the above positions as well as on the rough
observations in early January.  It is not impossible that the comet
is of short period.

       T = 1975 Jan. 7.15 ET     Peri. =  13.10
                                 Node  =  24.03   1950.0
       q = 1.1375 AU             Incl. =   6.02

     1975 ET     R. A. (1950) Decl.     Delta     r      m1
     Feb.  7     1 20.39    +13 09.8    1.245   1.240   11.4
          12     1 42.33    +15 37.7
          17     2 04.29    +17 54.2    1.310   1.310   11.8
          22     2 26.16    +19 57.6
          27     2 47.79    +21 47.0    1.403   1.393   12.2
     Mar.  4     3 09.07    +23 22.1
           9     3 29.89    +24 42.9    1.520   1.486   12.6

     Corrigendum.  On IAUC 2745, In the last line of the text, for
slight confirmation  read  slight condensation.


1975 February 12               (2748)              Brian G. Marsden

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