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IAUC 2902: 1975 YA; 1975n; VY CMa; V1500 Cyg

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IAUC number 

                                                  Circular No. 2902
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


1975 YA
     The following precise positions have been reported:

     1975/76 UT          R. A. (1950) Decl.        Observer
     Dec. 27.29722     6 58 49.72   +65 30 57.1    Kowal
          27.30069     6 58 34.07   +65 34 51.7      "
          31.11528    22 04 11.14   +69 12 54.5      "
          31.12222    22 04 01.11   +69 11 12.1      "
     Jan.  2.94583    21 30 32.46   +60 45 48.3    McCrosky
           2.98623    21 30 17.97   +60 40 46.6      "
           4.97309    21 22 02.76   +57 25 10.4      "
           5.05932    21 21 46.49   +57 18 04.8      "

C. Kowal (Hale Observatories).  46-cm Schmidt telescope, Palomar.
R. E. McCrosky and G. Schwartz (Harvard College Observatory, Agassiz
   Station).  155-cm reflector.  Measurer: C. Y. Shao.  Owing
   to clouds, the effective time of the first position is uncertain.


COMET WEST (1975n)
     D. Seargent, The Entrance, New South Wales, provides the
following total visual magnitude estimates, obtained using 20 x 65
binoculars: Jan. 1.45 UT, 10; 3.44, 10; 4.44, 9.5.


VY CANIS MAJORIS
     G. Wallerstein, temporarily at the National Radio Astronomy
Observatory, writes that spectra of VY CMa show a (heliocentric)
velocity shift from 80 to 37 km/s between Feb. 1973 and Mar. 1975;
the latter velocity is the lowest observed since 1941.  In Dec.
1975 T. Cragg estimated mv = 9.6, the faintest in at least 18
years.  Optical polarization, infrared, OH and H2O observations
would be helpful in understanding these changes.


V1500 CYGNI
     Further selected recent visual magnitude estimates: 1975 Dec.
13.76 UT, 9.5 (G. M. Hurst, Northampton, England); 21.06, 9.6 (P.
Maley, Houston, Texas); 30.00, 9.9 (P. Collins, Harvard College
Observatory); 1976 Jan. 2.05, 9.7 (Maley); 5.05, 9.7 (Maley).


1976 January 13                (2902)              Brian G. Marsden

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