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IAUC 4208: 1986G; OJ 287; V439 Cyg

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                                                  Circular No. 4208
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444

     R. Evans, Hazelbrook, N.S.W., reports his discovery on May
3.5 UT of a supernova of mag 12.5 and located 120" east and 60"
south of the nucleus of NGC 5128 = Cen A.  T.  Cragg provides the
following precise position, obtained directly with the Anglo-
Australian Telescope, and notes that the object is in a dark lane:
R.A. = 13h22m40s5, Decl. = -42deg46'16" (equinox 1950.0).  Measurements
by R. H. McNaught of an exposure by C. Humphries with the U.K.
Schmidt Telescope on May 3.605 UT gave end-figures 40s45, 18"7 (
uncertainty 0"7) and magnitude B = 13.23 +/- 0.11.  Visual magnitude
estimates by McNaught gave: May 3.545 UT, 12.4; 3.589, 12.5; 4.507
13.0; 4.654, 12.4.  Evans confirms that the object was fainter
(mag 13.0) on May 4.50 UT.

OJ 287
     V. Cayatte, M. Chevreton, G. Herpe and C. Vanderriest,
Observatoire de Paris, Meudon; and M. Moles, Madrid Observatory,
communicate: "The following B magnitudes (accuracy better than +/- 0.1
mag) were obtained photoelectrically and electronographically with
1.9-m and 1.5-m telescopes: 1985 Dec. 11, 15.8; Dec. 17, 16.2;
1986 Feb. 12, 16.6; Mar. 11, 15.5.  If further monitoring confirms
that the object was brightening between the last two nights, a
search could be undertaken for rapid variations.  On the other
hand, a new fading could provide an opportunity for studying the
faint emission features observed by Sitko and Junkkainen (1985,
P.A.S.P. 97, 1158) in the spectrum of the object."

     V. F. Polcaro, CNR/IAS, Frascati; and P. Tomasi, CNR/IRA,
Bologna, telex: "From positional coincidence and similarity with
optical counterparts of galactic binary systems, we suggest the B3e
star V439 Cyg as a possible counterpart of the x-ray source 1H
2018+366 (= 4U 2019+39?).  V439 Cyg is coincident with the infrared
source IRAS 20198+3716 and lies in the compact H II region BG
2019+37 = G75.77+0.34 with a well-defined thermal radio spectrum.
It is also enclosed in the error box of 2CG 075+00.  The probable
association of the G-ray source is also suggested by the similarity
to the system LS I+61P303 = GT 0236+610 (= G133.9+1.1?) = 2CG
135+01.  A campaign of coordinated observations is envisaged."

1986 May 5                     (4208)              Brian G. Marsden

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