Central Bureau for Astronomical Telegrams
IAUC 7933: 2002dx; 2002dy; 2002dv, 2002dw
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Circular No. 7933
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2002dx IN UGC 12861
B. Swift and W. D. Li, University of California at Berkeley
(UCB), report the LOTOSS (cf. IAUC 7906) discovery of an apparent
supernova on unfiltered KAIT CCD images taken on July 8.5 (mag
about 18.8) and 9.5 UT (mag about 18.9). SN 2002dx is located at
R.A. = 23h57m06s.73, Decl. = +29o50'15".5 (equinox 2000.0), which
is 4".0 east and 5".3 south of the nucleus of UGC 12861. A KAIT
image taken on 2001 Nov. 19.2 showed nothing at this position
(limiting mag about 19.5).
SUPERNOVA 2002dy IN MCG -01-59-24
Swift and Li also report the LOTOSS discovery, on unfiltered
KAIT images taken on July 8.5 and 9.5 UT, of an apparent supernova
(mag about 17.0) located at R.A. = 23h28m23s.27, Decl. =
-2 48'17".0 (equinox 2000.0), which is 21".4 west and 16".0 south
of the nucleus of MCG -01-59-24. A KAIT image taken on 2001 Nov.
2.2 showed nothing at this position (limiting mag about 19.5).
S. Jha, T. Matheson, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrogram
(range 370-750 nm; low signal-to-noise ratio) of SN 2002dy,
obtained by M. Calkins on July 10.47 UT with the Mt. Hopkins 1.5-m
telescope (+ FAST), shows it to be a type-II supernova. The
spectrum, taken during poor weather conditions, shows a flat
continuum with broad H-alpha and H-beta emission (FWHM 3100 km/s;
reminiscent of type-IIn supernovae) at the redshift of the host
galaxy (9904 km/s; NASA/IPAC Extragalactic Database). The H-beta
profile shows a hint of an absorption trough, at an expansion
velocity of 9200 km/s.
SUPERNOVAE 2002dv AND 2002dw
A. V. Filippenko, R. Chornock, and R. J. Foley, UCB, report
that inspection of CCD spectra (range 310-1000 nm), obtained on
July 11 UT with the Shane 3-m reflector at Lick Observatory,
reveals that both SN 2002dv (IAUC 7930) and SN 2002dw (IAUC 7932)
are young type-II supernovae. SN 2002dv exhibits strong H-alpha
emission with a weaker P-Cyg absorption component. H-beta and Fe
II lines with P-Cyg profiles are also present. SN 2002dw has a
nearly featureless continuum, possibly contaminated by hot stars in
an underlying H II region, as well as weak, broad H-alpha emission.
Corrigenda. On IAUC 7932, line 6, *for* June 4.3; 19.4 on
June *read* July 4.3; 19.4 on July
(C) Copyright 2002 CBAT
2002 July 11 (7933) Daniel W. E. Green
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