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IAUC 8888: V2467 Cyg; C/2007 L7-L11; 192P

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IAUC number 

                                                  Circular No. 8888
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://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


V2467 CYGNI
     R. J. Russell, R. J. Rudy, D. K. Lynch, The Aerospace
Corporation; and C. E. Woodward, University of Minnesota, report
0.8- to 5.5-micron spectroscopy of V2467 Cyg on Oct. 10 and 11 UT
using the Infrared Telescope Facility (+ SpeX).  The spectrum of
the nova has increased in excitation since coronal lines were
reported last May (IAUC 8848).  Lines of [Si X] and [S XI] are now
seen, indicating the presence of ionizing photons with energies up
to at least 447 electron volts.  The rarely seen [P VII] feature at
1.37 microns is also observed.  The hydrogen/helium emission-line
profiles remained peaked, whereas many of the coronal lines had
flatter, castellated tops.  Line widths (FWHM) were about 2000 km/s.
The lines of neutral carbon and nitrogen were gone, but the O I
lines are still present and suggest a reddening of E(B-V) = 1.7,
similar to the value of 1.5 reported by Mazuk et al. (IAUC 8848).
There is no indication of dust formation in the nova ejecta.


COMETS C/2007 L7-L11 (SOHO)
     Further to IAUC 8883, additional Kreutz sungrazing comets have
been found on SOHO website images ("discovery" observations
tabulated below).  C/2007 L7 was small, slightly diffuse, and very
faint (mag about 8).  C/2007 L8 and C/2007 L9 were very diffuse
(mag about 7.5), the former having no tail, and the latter being
elongated.  C/2007 L10 was very faint and stellar in appearance in
C3 images, and slightly diffuse (mag about 7.5) with a hint of tail
in C2 images.  C/2007 L11 was stellar in appearance (mag about 6.5)
in C3 images, and very diffuse with a short tail in C2 images.

 Comet        2007 UT      R.A.(2000)Decl.   Inst.  F    MPEC
 C/2007 L7    June 10.663   5 09.7  +21 06   C2     BZ   2007-T117
 C/2007 L8         10.688   5 08.7  +21 03   C2     BZ   2007-T117
 C/2007 L9         10.996   5 10.0  +21 02   C2     BZ   2007-T117
 C/2007 L10        13.321   5 20.9  +20 12   C3/2   BZ   2007-T122
 C/2007 L11        14.821   5 27.1  +20 18   C3/2   TH   2007-T122


COMETS 192P/SHOEMAKER-LEVY AND 193P/LINEAR-NEAT
     Comet P/2007 T3 = P/1990 V1 (cf. IAUC 8879) has been assigned
the permanent number 192P, and comet P/2007 U2 = P/2001 Q5 (cf.
IAUC 8885) has been assigned the permanent number 193P (cf. MPC
60847).

                      (C) Copyright 2007 CBAT
2007 November 1                (8888)            Daniel W. E. Green

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