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IAUC 8638: V476 Sct; C/2005 T6, T7, T8, W4, W5

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                                                  Circular No. 8638
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)
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Phone 617-495-7440/7244/7444 (for emergency use only)


V476 SCUTI
     R. B. Perry, Langley Research Center, NASA; C. C. Venturini,
R. J. Rudy, S. Mazuk, and D. K. Lynch, The Aerospace Corporation;
R. C. Puetter, University of California at San Diego; and B. Walp,
Lick Observatory, report 0.47- to 2.5-micron spectroscopy of V476
Sct (cf. IAUC 8607, 8612) using the Lick 3.0-m telescope (+ VNIRIS)
at Nov. 15.108 UT.  The nova is still quite early in its spectral
development, showing structured emission in the lines of C I, N I,
and Fe II with FWHM of 1600 km/s.  He I lines are just emerging and
are still very weak.  The strongest lines in the visible and
infrared spectrum are from O I, and these are produced almost
completely by Lyman_beta fluorescence.  The strong red continuum
strongly suggests thermal emission from dust, despite the fact that
the optical light curve is monotonically decreasing with time.  The
reddening indicated by the O I lines is E(B-V) = 2.0.


COMETS C/2005 T6, T7, T8, W4, W5 (SOHO)
     Additional comets have been found on SOHO website images (cf.
IAUC 8631); all were Kreutz sungrazers except for C/2005 W4 (a
Kracht-group object that appeared stellar with no tail in C2 and C3
images, peaking at mag 6.6 on Nov. 23.396 UT at 6.1 solar radii in
C2) and C/2005 W5 (a Marsden-group object that also was stellar in
appearance with no tail in all images, peaking at mag 7.1 on Nov.
29.854 at 5.1 solar radii in C2).  The Kreutz objects were tiny,
stellar, and too faint for photometry in C3 images, but very faint
and diffuse in C2 images.

 Comet       2005 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/2005 T6   Oct.  1.596  12 09.4   - 4 42   C3/2  HS   2005-X11
 C/2005 T7         4.513  12 27.1   - 5 33   C3/2  BZ   2005-X11
 C/2005 T8         6.613  12 34.8   - 6 17   C3/2  HS   2005-X11
 C/2005 W4   Nov. 23.344  15 51.1   -19 42   C2/3  BZ   2005-X14
 C/2005 W5        29.314  16 27.1   -22 59   C2/3  HS   2005-X14

It seems likely that C/2005 W4 is a return of C/2000 O3 (cf. MPEC
2000-Q09), a suggestion made by S. Hoenig before the observations
on MPEC 2005-X14 were available, where an orbital linkage by B. G.
Marsden (P = 5.32 yr) is published.  Comet C/2005 W5 has not been
satisfactorily linked to a Marsden-group candidate at its previous
perihelion passage, although potential fits to the various 1999
members seem preferable to those involving the comets of Feb. 2000
(cf. MPEC 2005-W07).

                      (C) Copyright 2005 CBAT
2005 December 4                (8638)            Daniel W. E. Green

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