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IAUC 4202: 1986E; 1986D; Mkn 507

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                                                  Circular No. 4202
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

     L. Rosino, Asiago Astrophysical Observatory, reports the
discovery by Candeo of a supernova 15" west and 133" north of the nucleus
of NGC 4302 (R.A. = 12h19m2, Decl. = +14deg53', equinox 1950.0).  On
Apr. 13.885 UT the object was at mpg = 14.5.

     R. D. Gehrz, University of Minnesota; R. D. Dietz, University
of Northern Colorado; G. L. Grasdalen and J. R. Smith, University
of Wyoming; and J. A. Hackwell, Aerospace Corporation, report: "We
have examined a series of 2-;m images of M82 made with the 2.34-m
Wyoming Infrared Telescope since 1983.2 and find that the 2-micron
point source reported as supernova 1986D by Lebofsky, Rieke and
Kailey (IAUC 4197) is coincident within positional errors with the
2-micron point source reported and designated K2 by Dietz et al. (1986,
A.J. 91, 758).  On 1985 Feb. 18 Dietz et al. found that the K magnitude
of K2 in a 3"3 beam was 9.7 +/- 0.1 (the statistical signal to
noise of the measurement was 130/1); their position for K2 was R.A. =
9h51m41s90 +/- 0s10, Decl. = +69deg54'59"5 +/- 0"5 (equinox 1950.0).  K2
is not coincident with any of the decaying radio supernova remnants
reported by Kronberg et al. (1985, Ap.J. 291, 693); it seems unlikely
that K2 is an old supernova.  A 2-micron image at 3"3 resolution
obtained by us (unpublished) on 1985 Dec. 30 shows K2 had not
varied by more than 10 percent since 1985 Feb.  Lower resolution
2-micron images (5" beam) made by us in 1983.2 (unpublished) show K2
but provide no evidence for significant variations in the brightness
of the source.  The relative constancy of the 2-micron brightness
of K2 from 1983.2 through 1986.2 suggests that it cannot be a recent
supernova.  We conclude that K2 is a persistent 2-micron feature
of M82 that is difficult to resolve because of its low contrast
with respect to the surrounding 2-micron emission from the galaxy."

     J. P. Halpern, Columbia Astrophysics Laboratory, reports:
"Spectra obtained with the Hale 5-m telescope in 1983 Sept. show
permitted lines of Fe II.  Mkn 507 is a Seyfert galaxy of the I Zw
1 type.  A foreground G star, somewhat brighter than the nucleus,
lies 2"0 away at p.a. 110.  Mkn 507 has extended H II region
emission lines and a companion emission-line galaxy 36" south."

1986 April 16                  (4202)              Brian G. Marsden

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