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IAUC 8375: 2004dg; 2004dh; 2004dd; C/2001 Q4

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IAUC number

                                                  Circular No. 8375
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     A. Vagnozzi, Stroncone, Italy, reports the discovery by D. De
Pasquale, F. Guerri, G. Guerri, M. Cristofanelli, S. Romanelli, and
himself of an apparent supernova on unfiltered CCD images taken
with 0.50-m and 0.30-m reflectors on July 19.854 (at mag 17.1) and
20.841 UT (mag 17.0).  The new object is located at R.A. =
14h59m58s.96, Decl. = +1o53'25".6 (equinox 2000.0; average of
measurements by S. Valentini from two images), which is
approximately 19" west and 3" south of the center of NGC 5806.  H.
Yamaoka, Kyushu University, reports that K. Itagaki (Teppo-cho,
Yamagata, Japan) found SN 2004dg at mag 16.8 on an unfiltered CCD
image taken on July 21.534, adding that nothing is visible at this
location on his archival images of this galaxy (the most recent one
taken in early June).

SUPERNOVA 2004dh IN MCG +04-1-48
     Further to IAUC 8373, M. Moore and W. Li report the LOSS
discovery of an apparent supernova on an unfiltered KAIT image
taken on July 21.47 UT (mag about 17.5).  The new object was
confirmed on an earlier image taken on July 11.45 (mag about 18.1).
SN 2004dh is located at R.A. = 0h18m00s.39, Decl. = +24o33'44".5
(equinox 2000.0), which is 7".3 east and 2".1 south of the nucleus
of MCG +04-1-48.  A KAIT image taken on June 30.48 showed nothing
at this position (limiting mag about 19.5).

     T. Matheson, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 340-730 nm)
of SN 2004dd (cf. IAUC 8373, 8374), obtained by M. Calkins on July
18.44 UT with the Mt. Hopkins 1.5-m telescope (+ FAST), shows it to
be a type-II supernova.  Adopting the NED recession velocity of
4060 km/s for the host galaxy, the expansion velocity derived from
the minimum of the H_beta line is 6300 km/s.

COMET C/2001 Q4 (NEAT)
     Visual total-magnitude estimates:  June 13.91 UT, 6.4 (A.
Diepvens, Balen, Belgium, 20x50 binoculars); 30.11, 7.0 (J. J.
Gonzalez, Leon, Spain, 7x50 binoculars); July 5.94, 7.3 (K.
Hornoch, Lelekovice, Czech Republic, 10x50 binoculars); 12.91, 7.6
(A. Baransky, Bucha, Ukraine, 10x50 binoculars); 17.88, 7.8 (R.
Haver, Frasso Sabino, Italy, 15x80 binoculars); 20.48, 7.9 (Y.
Nagai, Nagano, Japan, 11x80 binoculars).

                      (C) Copyright 2004 CBAT
2004 July 21                   (8375)            Daniel W. E. Green

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