Central Bureau for Astronomical Telegrams
IAUC 4202: 1986E; 1986D; Mkn 507
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 4203
Circular No. 4202
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
SUPERNOVA 1986E IN NGC 4302
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.
SUPERNOVA 1986D IN M82
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obtained by us (unpublished) on 1985 Dec. 30 shows K2 had not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2-micron images (5" beam) made by us in 1983.2 (unpublished) show K2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."
MARKARIAN 507
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
Read IAUC 4203
Our Web policy. Index to the CBAT/MPC/ICQ pages.
