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IAUC 2743: SN IN NGC 2207; GK Per; SATURN; VENUS; 1974f; Obs OF COMETS

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                                                  Circular No. 2743
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


SUPERNOVA IN NGC 2207
     Dr. M. Schmidt, Hale Observatories, communicates the following
photoelectric observations of supernova 1975A in the system NGC
2207, obtained by R. Green with the 152-cm telescope at Palomar.
The observations show the supernova increasing in brightness and
getting redder.

     1975 UT          V     B - V   U - B
     Jan. 17.260    14.90   -0.05   -0.36
          18.281    14.72   -0.03   -0.29
          20.278    14.66   +0.08   -0.14


GK PERSEI
     Mrs. Janet Mattei, Director of the American Association of
Variable Star Observers, communicates the following visual magnitude
estimates: Jan. 29.01 UT, 11.5 (P. 0. and M. J. Taylor); Feb.
1.02, 11.3 (C. Scovil); 2.0, 10.8 (J. E. Bortle); 3.0, 10.8
(Bortle); 3.10, 10.8 (E. Mayer).


SATURN
     T. Encrenaz, M. Combes, L. Vapillon, J. Berezne and Y. Zeau,
Planetary Group, Meudon Observatory, report: "We obtained spectra
of Saturn between 700 and 1300 cm**-1 (with 2.5 cm**-1 resolution) with
the 152-cm telescope at the European Southern Observatory in Nov.
1974.  C2H6 and C2H4 are visible in emission, and there may be a
weak emission due to C2H2.  At 1100 to 1150 cm**-1 there is an
absorption identified as CH3D."


VENUS
     Dr. J. E. Hansen writes: "Several observers are planning to
coordinate measurements of Venus during the interval May 1 to 15.
Included are ultraviolet photographs and polarization maps,
near-infrared radiance and polarization, CO2 and H2O absorption lines
and thermal infrared maps.  Additional measurements and observers
are encouraged.  Some measurements will be extended to June 15, and
measurements as a function of phase angle over the full range are
desirable.  The main objective is to study physical differences
between ultraviolet light and dark areas.  Further information can be
obtained from me at the address Goddard Institute for Space Studies,
2880 Broadway, New York, NY 10025, or from F. W. Taylor, Jet
Propulsion Laboratory, Pasadena, CA 91103, U.S.A.


PERIODIC COMET HONDA-MRKOS-PAJDUSAKOVA (1974f)
     The following precise positions have been reported:

     1974/75 UT          R. A. (1950) Decl.        m1    Observer
     Nov. 10.95497    18 35 16.07   -12 48 00.0          McCrosky
     Dec. 11.95374    20 00 18.83   -14 30 06.8            "
          14.70494    20 09 06.00   -14 50 59.4    9.0   Mrkos
          14.70963    20 09 07.34   -14 51 00.5            "
          21.70486    20 31 12.16   -16 16 49.2    8.2   Petrovicova
          21.71597    20 31 13.99   -16 16 56.7            "
     Jan.  2.38889    21 02 54.81   -21 53 58.1    6     Seki
           2.40139    21 02 56.37   -21 54 28.7            "
           7.44601    21 13 00.14   -26 21 24.2    8.1   Herald
          11.44178    21 19 11.26   -31 03 36.1    8.3     "
          11.44497    21 19 11.60   -31 03 52.6            "
          12.39778    21 20 26.90   -32 21 22.3    9.6   Gilmore

R. E. McCrosky (Harvard College Observatory, Agassiz Station).
   155-cm reflector.  Measurers: C. Y. Shao and J. H. Bulger.
A. Mrkos and Ruzena Petrovicova (Klet Observatory).
T. Seki (Kochi Observatory, Geisei Station).
D. Herald (Woden, near Canberra).  31-cm reflector.
A. C. Gilmore (Carter Observatory). 10-cm f/10 astrograph.
   Measurer: Pamela M. Kilmartin.


OBSERVATIONS OF COMETS
     Mr. T. Seki (Geisei), provides the following precise positions
of comets P/Gunn (1969 II), P/Borrelly (1973m) and van den Bergh
(1974g), obtained by N. Kojima (Ishiki) and himself:

   Comet    1974/75 UT          R. A. (1950) Decl.        m1    Observer
   1969 II  Dec. 12.80764    12 30 09.09   + 7 36 41.2   17     Seki
                 12.83264    12 30 10.65   + 7 36 34.5   17       "
                 16.82361    12 33 39.42   + 7 23 37.0            "
            Jan. 17.72569    12 54 56.26   + 6 37 07.0            "
                 17.84201    12 54 59.69   + 6 37 13.0          Kojima
   1973m    Jan. 23.79653    14 25 28.21   +19 48 36.1   18     Seki
                 23.81528    14 25 28.86   +19 48 41.1            "
   1974g    Dec. 16.50347     1 26 30.64   +25 47 56.4   18       "
            Jan. 14.40486     1 31 17.39   +22 26 11.7   18       "


1975 February 10               (2743)              Brian G. Marsden

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