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IAUC 8400: P/2004 R1; 2002hh

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                                                  Circular No. 8400
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)


COMET P/2004 R1 (McNAUGHT)
     J. Young (Table Mountain, 0.6-m reflector + CCD) reports that
images taken in poor seeing (and at low altitude) on Sept. 6.13-
6.16 UT show a coma diameter of about 5".  Additional CCD images by
R. H. McNaught with the Siding-Spring 1.0-m reflector on Sept. 6.5
show an ill-defined center of brightness that is elongated in the
direction of tail (and of the comet's motion).  Additional
astrometry, the following preliminary orbital elements, and an
ephemeris appear on MPEC 2004-R24.

     T = 2004 Aug. 30.185 TT          Peri. =   0.573
     e = 0.67898                      Node  = 296.131   2000.0
     q = 0.98775 AU                   Incl. =   4.875
       a =  3.07694 AU     n = 0.182610     P =   5.40 years


SUPERNOVA 2002hh IN NGC 6946
     M. Barlow and J. Fabbri, University College, London; and M.
Meixner and B. Sugerman, Space Telescope Science Institute, report
the detection of the type-II supernova 2002hh in archival Spitzer
IRAC images of NGC 6946 obtained by the SINGS Legacy program on
2004 June 10.76 UT.  A source was detected in all four IRAC bands
at R.A. = 20h34m44s.23, Decl. = +60o07'19".5 (equinox 2000.0; +/-
0".3 in each coordinate), in close agreement with the optical (IAUC
8005), radio (IAUC 8018), and x-ray positions (IAUC 8024).  The
measured flux densities are 0.93 +/- 0.13 mJy at 3.6 microns, 1.24
+/- 0.11 mJy at 4.5 microns, 4.22 +/- 0.44 mJy at 5.8 microns, and
17.40 +/- 1.85 mJy at 8.0 microns.  This rise is fitted by a 300-K
blackbody with integrated flux 1.35 x 10**-11 erg s**-1 cm**-2,
which for a distance to NGC 6946 of 6 Mpc corresponds to a
luminosity of 5.8 x 10**40 erg s**-1.  The equivalent blackbody
radius of 10**17 cm is too large to have been reached by dust-
condensate ejecta in the 590 days since the supernova discovery
date.  Meikle et al. (IAUC 8024) derived a host-galaxy extinction
of A(V) about 5.0 to the supernova.  A significant fraction of this
extinction may arise from a pre-existing dust shell that was
ejected during an earlier phase of evolution of the massive
progenitor star and heated by the supernova event.  Three convolved
companion sources were also detected, with the following position
angles, separations, and fluxes (mJy) at 3.6, 4.5, 5.8, and 8.0
microns:  Star 2 (= 2MASS 20344320+6007234), 297o, 8".6, 81.4 +/-
9.0, 62.6 +/- 3.5, 55.0 +/- 1.9, 36.9 +/- 1.9; Star 3, 286o, 11".4,
3.5 +/- 1.6, 0.6 +/- 0.1, 0.8 +/- 0.3, 2.1 +/- 0.4; Star 4, 319o,
3".2, 1.0 +/- 0.4, 0.6 +/- 0.1, 3.6 +/- 0.6, 12.8 +/- 1.8.

                      (C) Copyright 2004 CBAT
2004 September 6               (8400)            Daniel W. E. Green

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