Central Bureau for Astronomical Telegrams
IAUC 7929: 2002dt; 2002du; 2002ds
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Circular No. 7929
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2002dt IN ESO 516-G5
D. Hutchings and W. D. Li, University of California, report
the discovery by LOTOSS (cf. IAUC 7906) of an apparent supernova
(mag about 18.5) on unfiltered KAIT images taken on June 26.3 and
27.3 UT. SN 2002dt is located at R.A. = 16h03m47s.30, Decl. =
-22o44'19".5 (equinox 2000.0), which is 7".8 east and 11".1 south
of the nucleus of ESO 516-G5. A KAIT image taken on June 17.3
showed nothing at this position (limiting mag about 19.5). Li, R.
Chornock, and A. V. Filippenko write that a spectrum of SN 2002dt,
taken by M. M. Phillips with the Baade 6.5-m telescope at Las
Campanas on June 28.0 UT, shows it to be clearly a supernova, but
the exact type is uncertain. They add: "There are no hydrogen
Balmer lines or the Si II 635.5-nm line that are typical of normal
type-II and type-Ia supernovae, respectively. There are no Ca II H
and K or infrared triplet lines that are typical of normal type-
Ib/c supernovae. Narrow emission lines in the host galaxy yields a
recession velocity of 7487 km/s. Converting to rest wavelengths,
broad emission lines can be seen at 430, 503, and 560 nm. There
are also dips around 580 and 700 nm. Based on the fact that the
supernova is superposed on an H II region and lacks obvious type-Ia
or type-II features, we suspect that this may be a core-collapse
event related to the Ib/c variety (but possibly with substantial
differences)."
SUPERNOVA 2002du
G. Altavilla and colleagues (cf. IAUC 7780) report the
discovery of a supernova (V = 22.2) on CCD frames taken on Apr. 9.2
UT with the European Southern Observatory/Max-Planck-Institut 2.2-m
telescope (+ Wide Field Imager). SN 2002du is located at R.A. =
13h53m18s.28, Decl. = -11o37'28".8 (equinox 2000.0), which is
within 1" of the nucleus of its host galaxy. Nothing was visible
at this location on a similar image taken in Apr. 2001 (limiting
mag about 24). A spectrogram obtained on June 16.1 with the Very
Large Telescope Yepun (+ FORS2) shows broad H-alpha with a P-Cyg
profile, indicating that SN 2002du is a type-II supernova. Narrow
emission lines of the parent galaxy provide a redshift of z = 0.21.
SUPERNOVA 2002ds IN ESO 581-G25
Li, Chornock, and Filippenko also report that a spectrum of SN
2002ds (cf. IAUC 7928), taken as above by Phillips on June 28.0 UT,
shows it to be a young type-II event, with strong hydrogen Balmer
and He I 587.6-nm lines superposed on a blue continuum.
(C) Copyright 2002 CBAT
2002 June 29 (7929) Daniel W. E. Green
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