Circular No. 8374
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)
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Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVA 2004df
     Further to IAUC 8370, T. Boles reports the discovery of an
apparent supernova (mag 18.4) on unfiltered CCD images taken on
June 27.932 (at mag 18.4), 28.947 (mag 18.4), and July 13.001 (mag
18.1) UT.  The new object is located at R.A. = 15h08m20s.65, Decl.
= +21o52'35".3, which is approximately 10".7 west and 10".1 south
of the center of its host galaxy.  SN 2004df is not present on
Boles' images from May 18 and Mar. 20 (limiting mag 19.5), or on
Digitized Sky Survey plates (red, 1993 Mar. 21; blue, 1986 Apr. 8).


SUPERNOVAE 2004by, 2004cz, AND 2004dd
     Further to IAUC 8372, R. J. Foley, H. Pugh, and A. V.
Filippenko (University of California) report that inspection of CCD
spectra, obtained on July 18 UT, reveals that SN 2004by (IAUC 8349)
is a peculiar type-II supernova.  The object shows very narrow
H_alpha emission (at most a few hundred km/s FWHM) and a
corresponding low-velocity P-Cyg absorption line.  SN 2004cz (IAUC
8368) and SN 2004dd (IAUC 8373) are normal type-II-P supernovae,
with well-developed P-Cyg profiles of H, Ca II, Fe II, and other
species.  In SN 2004cz, the Na I D line (with a P-Cyg profile) is
especially strong compared with that in SN 2004dd.


UNUSUAL CATACLYSMIC VARIABLE IN HERCULES
     A. Price, AAVSO, reports on observations of the unusual
variable noted on IAUC 8363 and 8369.  A companion star < 1" away
complicates measurements of its brightness; the two objects
together were measured at V = 16 on July 16.217 UT, according to R.
James, Las Cruces, NM.  Further astrometry by A. Henden (1.0-m U.S.
Naval Observatory telescope) gives the new variable's position as
R.A. = 18h39m26s.154, Decl. = +26o04'09".89 (equinox 2000.0; +/-
0".018); this is 1" north of its nearby companion, which has
position end figures 26s.195, 09".07 (identical within the errors
to that of 2MASS 18392619+2604087 -- itself having position end
figures 26s.19, 08".8; +/- 0".06).  A steady period of 0.0577 +/-
0.0001 day exists during the outburst and decline.  A search by
Price and M. Templeton of 164 Harvard College Observatory plates
taken from 1929 to 1950 reveals four previous outbursts on 1932
Apr. 21 (to blue mag about 10.4), 1934 Oct. 17 (to mag about 12.2),
1939 Aug. 16 (to mag about 14.2, and 1941 Aug. 2 (to mag about
10.6).  Also, a nearby star (position end figures 27s.37, 06'15".3)
brightened by about 0.2 mag/day from 2004 June 30.17 to July 9.24,
when it was at V about 14.

                      (C) Copyright 2004 CBAT
2004 July 20                   (8374)            Daniel W. E. Green