Central Bureau for Astronomical Telegrams
IAUC 4385: EX Hya; NO SN IN NGC 4725; 1987F; P/SCHWASSMANN-WACHMANN 1
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Circular No. 4385
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
EX HYDRAE
Following an error in the telex (sent via Carter Observatory)
announcing Jones' discovery of an outburst in EX Hya, this U Gem
variable was accidentally called EX Hydri (EX Hyi) on IAUC 4383.
J. A. Mattei, AAVSO, provides the following visual magnitude
estimate from D. Overbeek, Edenvale, R.S.A.: May 5.760 UT, 10.0.
NO SUPERNOVA IN NGC 4725
A. V. Filippenko, University of California at Berkeley,
reports: "High-quality spectra (range 310-1000 nm, resolution 0.6-
1.6 nm) of the suspected supernova in NGC 4725 (IAUC 4373, 4374,
4377, 4382) were obtained on May 3 and 4 UT with a CCD spectrograph
on the Shane 3-m reflector at Lick Observatory. Preliminary
analysis indicates the object is a typical Galactic M4 or M5 dwarf,
rather than a type-I SN. Curiously, its faint southern companion
has an almost identical spectrum, but it is unlikely to be a
lensed image. The SN candidate is visible in the Palomar Sky
Survey prints, and several published small-scale photographs of NGC
4725 reveal both stars."
SUPERNOVA 1987F IN NGC 4615
Filippenko also obtained spectra (date and instrumentation
details given above) of the reported SN in NGC 4615 (IAUC 4381), and
notes: "Based on the presence of broad H emission lines at the
redshift of NGC 4615, SN 1987F is a type-II SN. However, its
spectrum is unusual; the continuum is very blue, and the Balmer lines
are weak, somewhat similar to the characteristics (Niemela et al.
1985, Ap.J., 289, 52) of SN 1983K about 24 days past maximum. Many of
the lines exhibit P-Cyg profiles. Although H-alpha is quite broad (FWHM
about 4000 km/s), the other Balmer lines seem much more narrow. He I
588-nm (or Na I 592-nm) is visible, and there may be Fe II lines
near 450 and 520 nm. The star is superposed on an H II region."
PERIODIC COMET SCHWASSMANN-WACHMANN 1
T. Gehrels and J. V. Scotti, University of Arizona, report
that images obtained with the Kitt Peak 0.91-m SPACEWATCH telescope
on May 3.45 UT show this comet to be in outburst with a strong nuclear
condensation and coma diameter 2'.0 x 1'.7, and jet-like structure
especially toward p.a. 150 deg; m1 was brighter than V = 14.7.
1987 May 6 (4385) Daniel W. E. Green
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