Central Bureau for Astronomical Telegrams
IAUC 4321: 1987B; 1987A
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Circular No. 4321
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 1987B IN NGC 5850
R. Evans, Hazelbrook, N.S.W., reports his discovery on Feb.
24.7 UT of a supernova of mag 15 located 75" west and 120" south
of the nucleus of NGC 5850 (R.A. = 15h04m.6, Decl. = +1 44', equinox
1950.0). The object was confirmed on Feb. 27.7 UT by G. Thompson
(Brisbane), R. H. McNaught (Siding Spring) and the discoverer.
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
G. Meurer, Mount Stromlo Observatory, telexes: "Four spectra
(range 300-900 nm, resolution 0.6 nm) were obtained on Feb. 25.43
UT with the Cassegrain spectrograph on the 1.9-m telescope. The
spectrum is nearly featureless except for broad (width 10 nm) Ca
II emission at 400 nm. There is also a possible faint, broad,
absorption feature at 555 nm. Unfortunately, there are gaps in
our spectral coverage at 420-470, 580-635 and 780-800 nm. The
smoothness of the spectrum and the Ca II emission suggest that the
object is a type II supernova."
N. R. Walborn, B. M. Lasker, B. McLean and V. G. Laidler,
Space Telescope Science Institute, report that the image of
Sanduleak -69 202 star 1 (cf. IAUC 4319) is asymmetrical on several
blue and red CTIO 4-m prime-focus plates (scale 18".6/mm) in 1974-
75, suggesting an additional companion within 1" in p.a. about 110 deg.
J. D. Bunton, on behalf of the Fleurs Radio Observatory,
University of Sydney, reports an intensity of 100 mJy at 1.4 GHz
averaged over 8 hr centered on Feb. 25.4 UT and increasing by 30
percent 24 hr later. A. J. Turtle, on behalf of the Molonglo
Observatory, University of Sydney, reports an intensity of 60 mJy
at 0.8 GHz for Feb. 25.4 and increasing by 50 percent 24 hr later.
D. L. Jauncey, on behalf of the CSIRO Division of Radiophysics,
reports an intensity of 100 mJy at 2.3 GHz for Feb. 26.4 from an
interferometer measurement using the Parkes 64-m telescope and the
DSN 45 (34-m antenna) at the NASA Tidbinbilla Tracking Station.
Preliminary positions are in agreement with the optical measurements
to within a few arcsec and preliminary flux densities have
typical uncertainties of 10 percent.
Further visual magnitude estimates by R. H. McNaught,
Coonabarabran, N.S.W.: Feb. 27.406 UT, 4.2; 27.558, 4.4; 27.715, 4.3.
1987 February 27 (4321) Brian G. Marsden
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