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IAUC 8612: V476 Sct = N Sct 2005; C/2005 S1; P/2005 S3

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IAUC number 

                                                  Circular No. 8612
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)


V476 SCUTI = NOVA SCUTI 2005
     N. N. Samus, Russian Academy of Sciences, informs us that the
designation V476 Sct has been given to this nova (cf. IAUC 8607).
     L. Kiss, University of Sydney; M. Bessel, Australian National
University (ANU); and A. Retter, Pennsylvania State University,
report that a low-resolution spectrogram (0.27 nm/pixel, range
550-1050 nm), taken with the ANU 2.3-m telescope (+ Double-Beam
Spectrograph) at Siding Spring Observatory on Oct. 6.36 UT, shows
that V476 Sct is a classical nova.  Strong emission lines of
hydrogen, oxygen, calcium, magnesium, carbon, and iron can be
identified.  The prominent H_alpha emission line has a symmetric
profile with FWZI exceeding 4000 km/s.  The strongest emission
lines include H_alpha, the O I 777.3-, 844.6-, and 926.4-nm lines,
members of the hydrogen Paschen series, the infrared Ca triplet,
and the C I 940.6-nm line, all with FWZI > 2000 km/s.  The overall
spectral appearance is similar to that of V443 Sct (N Sct 1989),
two weeks after its maximum (Williams et al. 1991, Ap.J. 376, 721).
     Visual magnitude estimates:  Oct. 1.208 UT, 11.8 (M. Linnolt,
Woodside, CA); 1.812, 11.5 (K. Hornoch, Lelekovice, Czech Republic);
1.91, 11.9 (J. M. San Juan, Avila, Spain); 2.82, 11.5 (J. Carvajal,
Madrid, Spain); 3.82, 11.6 (Carvajal).


COMET C/2005 S1 (SOHO)
     Further to IAUC 8604, K. Battams reports that additional
images of this comet show that a peak magnitude of 3.4 was reached
at about 10 solar radii.  The peak tail length in C2 images was
about 1 degree; by the time that the comet disappeared behind the
C2 occulter its tail was the same width as its head (so, in essence,
it was headless).  The final astrometry and improved orbital
elements for this Kreutz sungrazer appear on MPEC 2005-T35.


COMET P/2005 S3 (READ)
     This comet (cf. IAUC 8608) appears to be of short period; the
following improved orbital elements are taken from MPC 2005-T27:

     T = 2005 Oct.  9.433 TT          Peri. = 115.784
     e = 0.43617                      Node  = 276.022   2000.0
     q = 2.86795 AU                   Incl. =   3.375
       a =  5.08659 AU     n = 0.085914     P =  11.47 years

                      (C) Copyright 2005 CBAT
2005 October 6                 (8612)            Daniel W. E. Green

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