Central Bureau for Astronomical Telegrams
IAUC 5003: 1990I; 1990H; 1989d1; Corr
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Circular No. 5003
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1990I IN NGC 4650A
O. Pizarro, J. Miranda, and L. Pasquini, European Southern
Observatory; and B. Leibundgut, Center for Astrophysics, report their
discovery of a supernova in NGC 4650A (R.A. = 12h42m05s, Decl. =
-40 26'.5, equinox 1950.0); the object is located 14" east and 47"
south of the galaxy nucleus, and was found on an ESO Schmidt B plate
taken on Apr. 27.1 UT. Pasquini, B. Jarvis (ESO), and Leibundgut
report that a spectrum (spectral range 540-920 nm) of SN 1990I
obtained on Apr. 30.1 by J. P. Sivan, Marseille, with the ESO 1.5-m
Spectroscopic Telescope resembles a type-Ia supernova 5-6 weeks past
maximum. CCD photometry on Apr. 29.3 by V. Burwitz, Berlin, with
the 2.2-m telescope shows the supernova at mb = 16.7 and mv = 15.6.
The object is in or superposed on the polar ring of this well-known
ring galaxy (Whitmore et al. 1987, Ap.J. 314, 439).
SUPERNOVA 1990H IN NGC 3294
A. V. Filippenko, University of California at Berkeley, reports:
"M. Dickinson (also of Berkeley) obtained a spectrum (range
400-800 nm, resolution 1-2 nm) of SN 1990H with a CCD spectrograph
on the Shane 3-m reflector at Lick Observatory on Apr. 28. The
spectrum closely resembles that of the type-II SN 1987A roughly 12
weeks past core collapse, although the relative strength of the Ba
II 614.2-nm absorption line is larger in SN 1987A. Thus, both the
light curve (IAUC 4992) and the spectrum of SN 1990H suggest that
its physical nature is similar to that of SN 1987A."
PERIODIC COMET SCHWASSMANN-WACHMANN 3 (1989d1)
Total visual magnitude estimates (cf. IAUC 4985): Mar. 31.49
UT, 11.3 (C. S. Morris, Pine Mountain Club, CA, 0.26-m reflector; 4'
tail in p.a. about 270 deg); Apr. 7.10, 10.6 (H. Dahle, Oslo, Norway,
0.20-m reflector); 21.46, 10.5 (A. Hale, Las Cruces, NM, 0.41-m
reflector); 24.76, 10.1 (J. Kobayashi, Kumamoto, Japan, 0.31-m reflector;
12' tail in p.a. 255 deg); 29.84, 10.2 (A. Pearce, Scarborough,
W. Australia, 0.20-m reflector; 0.12-deg tail in p.a. 256 deg).
CORRIGENDUM
On IAUC 4989, last line, the observation on Apr. 4.87 was of SU
UMa, not of SW UMa. Visual magnitude estimates for SW UMa: Apr.
4.85 UT, [13.9 (Granslo); 5.88, 14.9 (S. Korth, Dusseldorf, W. Germany).
1990 April 30 (5003) Daniel W. E. Green
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