Central Bureau for Astronomical Telegrams
IAUC 7917: 2002di; 2002cv, 2002dh
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Circular No. 7917
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)
SUPERNOVA 2002di IN MCG +05-40-2
T. Puckett and L. Cox, Mountain Town, GA, report the discovery
of an apparent supernova (mag 17.6) on an unfiltered CCD frame
(limiting mag 19.3) taken with the Puckett Observatory 0.35-m
automated patrol telescope on June 9.30 UT, and the object was
confirmed on CCD frames taken on June 10.14. The new object is
located at R.A. = 16h52m23s.30, Decl. = +30o42'40".0 (equinox
2000.0), which is 7".4 east and 0".1 north of the center of MCG
+05-40-2. SN 2002di is not present on images taken by Puckett on
2002 Mar. 1, 14, and Apr. 21 (limiting mag about 19.5) or on
Palomar Sky Survey images taken on 1989 July 5 (limiting mag about
21.0), 1989 May 2 (limiting mag about 21.0), and 1950 May 20
(limiting mag about 20.0).
SUPERNOVAE 2002cv AND 2002dh
A. V. Filippenko, R. Chornock, R. J. Foley, and W. Li,
University of California, Berkeley, report that inspection of CCD
spectra (range 330-1000 nm) obtained on May 19 and June 8 UT with
the Shane 3-m reflector at Lick Observatory confirms that SN 2002cv
(IAUC 7901) is indeed probably of type Ia, similar to SN 1991T
(e.g., Filippenko et al. 1992, Ap.J. 384, L15), as was previously
suggested by Meikle et al. through infrared spectroscopy (IAUC
7911, 7913). The May 19 spectrum shows a highly reddened, nearly
featureless continuum, although there is a weak absorption line
near 800 nm, as in early-time spectra of SN 1991T. The June 8
spectrum is dominated by strong, very broad Ca II emission near 860
nm; the absorption component is significantly weaker. Spectra of
SN 2002dh (IAUC 7916) obtained on June 8 (as above) reveal a blue
continuum with hydrogen Balmer lines having P-Cyg profiles (except
H-alpha, which is greatly dominated by emission). Weak He I
absorption at 590 nm is also present.
T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum (range
370-750 nm) of SN 2002dh, obtained by P. Berlind on June 10.22 UT
with the Mt. Hopkins 1.5-m telescope (+ FAST spectrograph), shows
it to be a type-II supernova. The spectrum consists of a blue
continuum with P-Cyg lines of hydrogen and helium. Narrow H-alpha
emission from a nearby H II region indicates a recession velocity
of 3900 km/s for the host galaxy. Using this value, the expansion
velocity derived from the minimum of the H-beta line is 10600 km/s.
(C) Copyright 2002 CBAT
2002 June 10 (7917) Daniel W. E. Green
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