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IAUC 8322: P/2004 EW_38; 2004bc, 2004be

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IAUC number 

                                                  Circular No. 8322
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 EW_38 (CATALINA-LINEAR)
     An apparently asteroidal object reported independently by the
Catalina and LINEAR surveys (discovery observations below from MPS
102307; linked by G. V. Williams) has been found to be cometary on
CCD images obtained at two Arizona observatories.  Observations
(via independent discovery) on Apr. 14.3 UT by M. T. Read and J. A.
Larsen, using the 0.9-m f/3 Spacewatch reflector at Kitt Peak, show
a tail 100" long in p.a. 300 deg, extending asymmetrically from
the south part of the nuclear condensation.  Exposures taken to
look for cometary appearance on Apr. 14.32 by C. W. Hergenrother
with the 1.2-m reflector at Mt. Hopkins show a very condensed 9"
coma and a narrow tail 210" long in p.a. 295 deg.

     2004 UT             R.A. (2000) Decl.       Mag.   Observer
     Mar. 14.46190   13 57 45.77   - 4 38 44.6   20.0   Catalina
          16.33976   13 56 53.63   - 4 37 59.8   19.7   LINEAR

     Additional astrometry, the following elliptical orbital
elements, and an ephemeris appear on MPEC 2004-G46.

                    Epoch = 2003 Nov. 17.0 TT
     T = 2003 Nov. 19.8968 TT         Peri. =  90.2353
     e = 0.500268                     Node  =  49.9014  2000.0
     q = 1.793350 AU                  Incl. =   6.5233
       a =  3.588624 AU    n = 0.1449814    P =   6.798 years


SUPERNOVAE 2004bc AND 2004be
     Further to IAUC 8321, T. Matheson et al. report that a
spectrum of SN 2004bc (cf. IAUC 8315), obtained by J. Huchra on
Apr. 12.26 UT with the Mt. Hopkins 1.5-m telescope, shows it to be
a type-Ia supernova, a few days before maximum.  Adopting the NED
recession velocity of 7221 km/s for the host galaxy, the supernova
expansion velocity is 11700 km/s for Si II (rest 635.5 nm).  The
spectrum is highly reddened and shows a strong narrow Na I D
absorption at the velocity of the host galaxy with an equivalent
width of 0.2 nm.  The dust maps of Schlegel et al. (1998, Ap.J.
500, 525) indicate a low value for Galactic reddening of E(B-V) =
0.065.  A spectrogram of SN 2004be (cf. IAUC 8317), obtained by
Huchra on Apr. 13.23, shows it to be a type-II supernova; adopting
the NED recession velocity of 2282 km/s for the host galaxy, the
expansion velocity derived from the minimum of the H_beta line is
9800 km/s.

                      (C) Copyright 2004 CBAT
2004 April 15                  (8322)            Daniel W. E. Green

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