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IAUC 8433: P/2003 YM_159; 2004fb

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                                                  Circular No. 8433
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)

     The Catalina Sky Survey has reported observations of two
short-tailed comet suspects on four CCD frames obtained over a
39-min span on Nov. 10.5 UT (observer R. Hill; 0.68-m Schmidt
telescope).  The head of the slightly fainter of the two was
situated about 102" west and 33" north of that of the brighter and
close to end of the latter's tail.  Assuming that the two orbits
differed only in T, B. G. Marsden, Harvard-Smithsonian Center for
Astrophysics, found that the objects -- if real -- had to be
intermediate-period comets some 4.3-4.4 AU from the earth.  The
assumption also revealed likely LINEAR observations of a single
asteroidal object on Oct. 8 and 24, and a three-night linkage then
showed identity with the LINEAR asteroidal object 2003 YM_159,
observed on 2003 Dec. 17 and 30 (see MPS 109905) -- the identity
clearly being with the brighter 2004 Nov. 10 object, now designated
component A.  Discovery observations:

      2003/4 UT           R.A. (2000) Decl.       Mag.   Observer
  A   Dec. 17.26424    5 19 48.87   +37 08 16.5   19.1   LINEAR
  A   Nov. 10.46635    9 33 16.44   +34 59 27.7   17.6   Hill
  B        10.46635    9 33 08.06   +35 00 02.4   18.1     "

The 2004 astrometry, the following orbital elements for component
A, and an ephemeris are given on MPEC 2004-V52.  T for component B
will occur about 0.23 day later.

                    Epoch = 2005 Mar. 11.0 TT
     T = 2005 Feb. 28.5311 TT         Peri. =  87.6590
     e = 0.444960                     Node  =  47.8605  2000.0
     q = 4.411276 AU                  Incl. =  19.3584
       a =  7.947668 AU    n = 0.0439890    P =  22.41 years

SUPERNOVA 2004fb IN ESO 340-G7
     N. Morrell, M. Hamuy, and G. Folatelli, Las Campanas
Observatory and Carnegie Supernova Project, report that a CCD
spectrogram (range 360-900 nm), obtained on Oct. 24.09 UT with the
Magellan II (Clay) telescope (+ LDSS-2 spectrograph), reveals that
SN 2004fb (IAUC 8420) is a type-II supernova showing a blue
continuum with strong absorption lines and a prominent P-Cyg
profile in H_alpha.  The velocity obtained for the absorption
minimum of H_beta is 6620 km/s, assuming the NED host-galaxy
recession velocity of 6100 km/s.

                      (C) Copyright 2004 CBAT
2004 November 10               (8433)            Daniel W. E. Green

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