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IAUC 8315: 2004bc; 2004ac; (2867)

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IAUC number

                                                  Circular No. 8315
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)

SUPERNOVA 2004bc IN NGC 3465
     F. Manzini, Sozzago, Italy, reports his discovery of an
apparent supernova (mag about 16.5) on unfiltered CCD images taken
with a 0.4-m telescope on Apr. 1.87-1.91 UT, noting the new object
to be 3".5 west and 3".5 south of the center of NGC 3465, and
adding that nothing is visible at this location on his image from
Mar. 16 (limiting mag about 19.0) or on Palomar Sky Survey images.
Confirming unfiltered CCD images were obtained by Manzini, R.
Crippa, and F. Fumagalli (0.4-m telescope) and by M. Amoretti
(Sanremo, Italy, 0.16-m telescope) on Apr. 3.92, and by P.
Holvorcem and M. Schwartz (0.81-m Tenagra telescope near Nogales,
AZ) on Apr. 4.23.  Holvocem reports the magnitude of SN 2004bc as
16.6 and provides the following precise position:  R.A. =
10h59m31s.41, Decl. = +75o11'28".9 (equinox 2000.0), which is 4".5
west and 4".3 south of the nucleus of NGC 3465.

SUPERNOVA 2004ac IN IC 4769
     M. Phillips, M. Hamuy, and S. Gonzalez, Carnegie Observatories,
report that a spectrum (range 380-920 nm) of SN 2004ac (cf. IAUC
8295, 8296), obtained on Mar. 25.39 UT with the Las Campanas
Observatory Dupont 2.5-m telescope (+ WFCCD), shows that this is a
type-Ia supernova, about 2.5 months past maximum light.

(2867) STEINS
     M. D. Hicks and J. M. Bauer, Jet Propulsion Laboratory,
California Institute of Technology; and and A. T. Tokunaga,
Institute for Astronomy, University of Hawaii, write that they
obtained BVRI photometry of minor planet (2867), a Rosetta flyby
target, during Mar. 27 and 28 UT at the Table Mountain Observatory
0.6-m telescope.  The minor planet exhibited a double-peaked
lightcurve with a period of 6.06 +/- 0.05 hr and amplitude 0.2 mag,
corresponding to a maximum a/b triaxial ratio of 0.8.  Assuming G =
0.15 for the phase-function slope parameter, averaged absolute
magnitudes of 12.67 +/- 0.02 in R and 13.18 +/- 0.04 in V are
derived.  Hicks et al. add that the measured colors of B-R = +1.311
+/- 0.026, V-R = +0.513 +/- 0.029, and R-I = +0.440 +/- 0.030
cannot rule out a D-type taxonomic classification but are more
suggestive of an S-type asteroid.

                      (C) Copyright 2004 CBAT
2004 April 4                   (8315)            Daniel W. E. Green

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