Central Bureau for Astronomical Telegrams
IAUC 8418: 2004ew, 2004ex; 2004eu
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Circular No. 8418
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVAE 2004ew AND 2004ex
C. Jacques and E. Pimentel, Belo Horizonte, Brazil, report
their discovery of an apparent supernova (mag 17.3) on unfiltered
CCD images taken on Oct. 8.18 and 10.15 UT. L. A. G. Monard,
Pretoria, South Africa, reports his independent discovery of SN
2004ew at mag 17.5 on unfiltered CCD images taken on Oct. 9.918 and
10.758. Jacques provides the following position for the new object:
R.A. = 2h05m06s.17, Decl. = -55o06'31".6 (equinox 2000.0), which is
5".6 east and 12".1 north of the center of the galaxy ESO 153-G17.
Jacques adds that nothing is visible at this position on a 1975 red
Palomar Sky Survey image, Monard specifying that nothing is visible
at this location on a red Digitized Sky Survey to limiting mag 20.5.
Monard provides position end figures 06s.16, 32".5. SN 2004ew also
is not visible on earlier CCD images taken by the discoverers, with
the following limiting magnitudes reported: 2003 Aug. 19.33, [18.5
(Jacques); 2004 Sept. 8.87, [18.5 (Monard); 12.21, [18.1 (Jacques).
Further to IAUC 7478, O. Trondal and M. Schwartz report the
discovery of an apparent supernova (mag about 17.7) on unfiltered
Tenagra II 0.81-m telescope images taken on Oct. 11.34 and 13.33 UT.
The new object was not detected in an earlier image taken on Sept.
24.27 (limiting mag about 19.0). SN 2004ex is located at R.A. =
0h38m10s.19, Decl. = +2o43'17".2 (equinox 2000.0), which is 33"
west and 25".3 south of the nucleus of NGC 182.
SUPERNOVA 2004eu IN MCG +07-5-39
A. V. Filippenko, R. J. Foley, and B. J. Swift, University of
California, Berkeley, report that inspection of CCD spectra (range
330-1000 nm), obtained on Oct. 13 UT with the Shane 3-m reflector
at Lick Observatory, reveals that SN 2004eu (IAUC 8417) is probably
of type Ic, perhaps a week or two past maximum brightness. However,
it exhibits some peculiarities, such as unusually weak Na I D
absorption and unusually strong emission (Ca II?) at 400 nm.
M. Modjaz, R. Kirshner, P. Challis, Harvard-Smithsonian Center
for Astrophysics; and T. Matheson, National Optical Astrononmy
Observatory, report that a spectrum (range 350-740 nm) of SN 2004eu,
obtained by P. Berlind on Oct. 8.37 UT with the F. L. Whipple
Observatory 1.5-m telescope (+ FAST), shows it to be a type-Ic
supernova. The spectrum is similar to spectra of SN 1994I
(Filippenko et al. 1995, Ap.J. 450, L11), which were taken a few
days after maximum. Follow-up spectra obtained by M. Calkin on
Oct. 11.39 and 13.38 confirm the classification.
(C) Copyright 2004 CBAT
2004 October 14 (8418) Daniel W. E. Green
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