Central Bureau for Astronomical Telegrams
IAUC 5034: 1990M
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Read IAUC 5035
Circular No. 5034
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 1990M IN NGC 5493
G. Sonneborn, Goddard Space Flight Center; and R. Kirshner,
Center for Astrophysics, report: "An ultraviolet spectrum of SN
1990M was obtained with the International Ultraviolet Explorer
satellite on June 15.80 UT. The detected spectrum, examined at
the observing console, covers the range 330-250 nm with a maximum
near 280 nm. Improved coordinates for SN 1990M were derived from
spacecraft maneuvering and Fine Error Sensor (FES) acquisition
data: R.A. = 14h08m52s.4, Decl. = -4 48'31" (equinox 1950.0),
with uncertainties of +/- 0".7. The following V magnitude
estimates, with a correction for the NGC 5493 background, were
derived from FES measurements: June 15.8, 12.4; 18.4, 12.5."
M. Della Valle and P. Leisy, European Southern Observatory,
report: "Preliminary analysis of high-quality CCD spectra (range
450-900 nm), obtained on June 16.1 UT with the ESO 1.52-m
telescope at La Silla, shows the characteristic feature at 615 nm,
typical of type-Ia supernovae. Additional absorptions of Si II
at 597 and 505 nm and Fe II at 521 nm appear blueshifted by
13 800, 14 900, and 14 400 km/s, respectively."
E. Horine, F. L. Whipple Observatory, reports that observations
made with the 1.5-m reflector at Mount Hopkins on June 16.2
UT show the spectrum of a type-Ia supernova near maximum light.
S. Benetti, M. Turatto, and E. Cappellaro, Asiago Observatory,
communicate: "We obtained a CCD spectrum (range 400-700
nm) of SN 1990M with the Cima Ekar 1.8-m telescope (+ Boller and
Chivens spectrograph) on June 17.99 UT. The spectrum shows the
typical features of a type-Ia supernova about 10 days after
maximum. The expansion velocity deduced from the minimum of the Si
II 635.5-nm absorption, 11 000 km/s, is normal for a type-Ia
supernova at this phase."
H. Bond, Space Telescope Science Institute, telexes that CCD
photometry obtained with the 0.9-m telescope at Cerro Tololo
Interamerican Observatory on June 16.984 UT yields V = 13.37, B-V =
+0.24. The values are approximate (+/- 0.1 mag) due to the strong
background from NGC 5493, but show that the supernova is still
relatively blue.
A visual observation by M. P. Candy, Bickley, W.A., on June
16.6 UT gives the supernova offset from the galaxy's center as 5"
in p.a. 240 deg. Visual magnitude estimate by A. Hale, Las Cruces,
NM: June 17.27 UT, 13.2.
1990 June 18 (5034) Daniel W. E. Green
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