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IAUC 2786: AL Com; 1975d; P/SCHWASSMANN-WACHMANN 1

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IAUC number 

                                                  Circular No. 2786
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


AL COMAE BERENICES
     H. E. Bond and A. U. Landolt, Department of Physics and
Astronomy, Louisiana State University, write that a plate (103a-O +
GG385 filter) taken by Landolt with the L.S.U. 91-cm reflector on
Apr. 16.190 UT showed AL Com at B = 15.26 +/- 0.05, using Bertola's
(1964, Ann. d'Astrophys. 27, 298) sequence.  On May 2.3 Bond found
the star to be at the visual limit of the 213-cm reflector at the
Kitt Peak National Observatory, around magnitude 18.


COMET BRADFIELD (1975d)
     Further precise positions have been reported as follows:

     1975 UT             R. A. (1950) Decl.        Observer
     May   5.37396     4 59 15.39   - 8 42 56.8    Herald
           8.35208     5 11 56.66   - 7 43 11.1      "
           8.37014     5 12 01.45   - 7 42 47.8      "
          14.36944     5 36 51.53   - 5 45 23.5      "
          14.37500     5 36 53.13   - 5 45 15.1      "
          15.72083     5 42 19.19   - 5 19 37.0    Hers
          18.71111     5 54 12.15   - 4 24 16.5      "
          22.69583     6 09 34.86   - 3 13 47.5      "

D. Herald (Woden, near Canberra).  m1 ~ 11 on May 19.
J. Hers (Randburg, near Johannesburg).  Images very poor and
   difficult to measure.  Haze and bright moonlight on May 22.


PERIODIC COMET SCHWASSMANN-WACHMANN 1
     The following precise positions have been reported:

     1974 UT             R. A. (1950) Decl.        Observer
     Oct.  6.12143    23 07 03.51   + 1 16 26.8    Torres
           9.11368    23 05 57.17   + 1 10 06.9      "
     Dec. 18.94808    23 07 01.87   + 0 53 23.9    McCrosky

C. Torres (Department of Astronomy, University of Chile).  Cerro El
   Roble Station, Maksutov astrograph.  Fan-type coma.
R. E. McCrosky and G. Schwartz (Harvard College Observatory,
   Agassiz Station).  155-cm reflector.  Measurer: J. H. Bulger.


1975 June 2                    (2786)              Brian G. Marsden

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