[IAUC] IAUC 8888: V2467 Cyg; C/2007 L7-L11; 192P [25139-2008/05-R1]
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Jue Nov 1 20:08:23 ART 2007
Circular No. 8888
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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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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