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IAUC 2864: 1974g; V1500 Cyg (N Cyg 1975); N Mon 1975

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                                                  Circular No. 2864
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 VAN DEN BERGH (1974g)
     E. Roemer, University of Arizona, communicates the following
precise positions.  Measurer: C. C. McCarthy.

     1974/75 UT          R. A. (1950) Decl.        Note
     Dec. 19.07292     1 26 34.09   +25 27 08.3     1
          19.09520     1 26 34.12   +25 26 57.6     1
     Feb.  9.10764     1 42 15.22   +20 29 56.4     2
           9.15069     1 42 16.56   +20 29 47.6     2
     Sept.12.40419     3 45 28.84   +12 57 37.8     1

Note 1: Steward Observatory's 229-cm  reflector, Kitt Peak.  L. M.
   Vaughn assisted on Dec. 19, R. A. McCallister on Sept. 12.
Note 2: Lunar and Planetary Laboratory's 154-cm reflector.


V1500 CYGNI (NOVA CYGNI 1975)
     According to Astron. Tsirk. No. 889, a prediscovery observation
by O. Suyarkova (Dushanbe) put the nova at photographic
magnitude 13.5 on Aug. 28.732 UT.

     P. A. Whitelock and P. R. Jorden, Imperial College, London;
and C. Sanchez Magro, University of La Laguna, report the following
infrared magnitudes (accuracy ~ 0.1), measured usinq the 152-cm
Tenerife flux collector: Aug. 30.1 UT, H = 1.05, K = 1.05, L = 1.0;
31.0, 0.45, 0.3, 0.15; Sept. 4.2, 2.5, 2.2, 1.2.

     Further selected recent visual magnitude estimates: Oct. 18.85
UT, 8.2 (G. M. Hurst, Northampton, England); 21.06, 8.8 (T. R.
Williams, Houston, Texas); 23.0, 8.7 (J. Bortle, Brooks Observatory);
25.0, 8.8 (Bortle); 27.02, 8.5 (R. A. Keen, Boulder, Colorado);
28.08, 8.7 (S. O'Meara, Cambridge, Massachusetts); 29.77,
8.7 (N. A. v.d. Mey, Soesterberg, The Netherlands); 31.8, 8.9 (R.
Lukas, Wilhelm Foerster Observatory); Nov. 3.00, 8.9 (O'Meara);
5.08, 9.1 (P. Maley, Houston, Texas); 7.09, 9.2 (Maley).


NOVA MONOCEROTIS 1975
     J. Bortle, Brooks Observatory, provides the following further
visual magnitude estimates: Oct. 23.38 UT, 12.2; 28.4, 12.3.


1975 November 10               (2864)              Brian G. Marsden

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