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IAUC 8911: C/2007 VO_53; V597 Pup

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                                                  Circular No. 8911
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)


COMET C/2007 VO_53 (SPACEWATCH)
     An apparently asteroidal object discovered at Mt. Lemmon on
2008 Jan. 11, and posted on the 'NEOCP', was identified by T. Spahr
with observations made by the Spacewatch survey of an object
designated 2007 VO_53 (astrometry on MPS 225225; mag 20.6-20.8 on
Nov. 5.3 UT; discovery observation tabulated below) on 2007 Nov. 1
and 5, along with other prediscovery observations.  J. Montani
reports that Spacewatch 120-s images obtained on Jan. 13 at the
1.8-m telescope by M. Read show a convincing coma of diameter 3"-4".
The newly available astrometry, orbital elements (epoch = 2010 May
4.0 TT, T = 2010 Apr. 26.8275 TT, e = 0.998997, q = 4.845156 AU,
Peri. = 75.0133 deg, Node = 59.7363 deg, i = 86.9952 deg, equinox
2000.0), and an ephemeris appear on MPEC 2008-B16.

     2007 UT             R.A. (2000) Decl.
     Nov.  1.26107    4 05 28.01   +15 09 28.9


V597 PUPPIS
     J.-U. Ness and S. Starrfield, Arizona State University; G. J.
Schwarz, West Chester University; and J. P. Osborne and K. Page,
University of Leicester, report on behalf of the Swift "nova-CV
group" on an x-ray detection of V597 Pup on Jan. 8.02 and 17.18 UT.
The count rates, after PSF correction and correction for bad
columns, were 0.010 +/- 0.003 and 0.012 +/- 0.002 counts/s,
respectively, in the XRT energy band 0.3-10 keV.  The source is
soft, with the majority of counts below 0.7 keV.  V597 Pup was not
detected in two earlier Swift observations obtained on 2007 Nov. 20
and Dec. 11.  Nearly simultaneously with the first Swift detection,
R. J. Rudy, R. W. Russell, and D. K. Lynch, The Aerospace
Corporation; C. E. Woodward, University of Minnesota; and A. Rivkin,
Johns Hopkins University Applied Physics Laboratory, obtained
spectroscopic observations spanning 0.8-2.42 microns using the
Infrared Telescope Facility (+ SPeX) on Jan. 7.48.  V597 Pup (cf.
IAUC 8896) has now reached moderately high excitation, suggesting
that the x-ray detection represents the ionizing source.  Strong
lines of He II, the unidentified nova lines at 1.11, 1.19, 1.55,
and 2.09 microns, and weak coronal lines of [S VIII], [Si VI], and
[Ca VIII] were detected.  The H I and He I lines remain broad and
flat-topped with FWHM approximately 3500 km/s.  The O I lines that
are fluorescently excited by Lyman_beta are still present and
indicate a small reddening of E(B-V) about 0.3.  There are no
indications of dust formation in the nova.

                      (C) Copyright 2008 CBAT
2008 January 18                (8911)            Daniel W. E. Green

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