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IAUC 3013: X-RAY SOURCES; VV Cep; 1976k; 1973 NA

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IAUC number 

                                                  Circular No. 3013
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     Telex: 921428
Telephone: (617) 864-5758


X-RAY SOURCES
     M. G. Watson, J. Pye, M. Elvis and A. Lawrence, X-Ray Astronomy
Group, University of Leicester, report that observations during
the Ariel 5 galactic plane scan (cf. IAUC 2995) showed Cir X-1 to
become visible on Nov. 24 and to increase in intensity to approximately
90 Ariel cts/s (~ 240 Uhuru cts/s); the intensity dropped
sharply on Nov. 26.4 UT, approximately in phase with the prediction
by Kaluzienski et al. (see also IAUC 3003).  A new, variable source
has appeared near the galactic center at ~ 7 Ariel cts/s with line
of position centered on R.A. = 18h05m.5, Decl. = -18o37' (equinox 1950.0).
A source with ~ 40 cts/s is present with line of position near 3U
1727-33 and possibly associated with MXB1730-335 in its 'on' state.


VV CEPHEI
     I. D. Howarth, Department of Physics and Astronomy, University
College, London, provides the following observations, confirming
that the eclipse has begun: Nov. 3.9 UT, V = 4.87, B = 6.84; Nov.
22.9,  V = 5.13, B = 7.08, U = 8.52.  With further reference to the
note on IAUC 3006, A. Galatola suggests that 20 Cep be used for the
comparison star and that each observer determine its photometric
parameters in his own telescope system.


COMET LOVAS (1976k)
     T. Seki, Kochi Observatory, Geisei Station, provides the
following precise positions, obtained using a 40-cm reflector:

     1976 UT             R. A. (1950) Decl.
     Nov. 23.72361     9 20 21.4    +72 12 42
          23.79410     9 20 15.7    +72 12 55


1973 NA
     J. Gibson provides the following precise position, measured
from a plate taken with the 51-cm double astrograph at the former
Yale-Columbia Southern Station, El Leoncito:

     1973 UT             R. A. (1950) Decl.
     Aug.  1.03472    14 36 26.93   -64 25 32.0


1976 December 1                (3013)              Brian G. Marsden

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