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IAUC 8863: C/2007 Q1; V458 Vul = N Vul 2007

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                                                  Circular No. 8863
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     G. J. Garradd reports his discovery of a slightly diffuse
comet on CCD images taken in poor seeing with the 0.5-m Uppsala
Schmidt telescope in the course of the Siding Spring Survey
(discovery observation tabulated below).  Following posting on the
Minor Planet Center's 'NEOCP' webpage, several other CCD
astrometrists have commented on the object's cometary appearance.
N. Teamo and S. Hoenig (0.41-m f/8 Ritchey-Chretien telescope at
Punaauia, Tahiti) found a 6" diffuse coma and a fan-shapped 20"-
long tail in p.a. approximately 200 deg, spanning approximately 50
deg of p.a., on Aug. 22.5.  L. Ligustri (Talmassons, Udine, Italy,
0.35-m f/5 reflector) writes that fifteen 180-s co-added exposures
from Aug. 24.0 show a coma diameter of about 12" with an elongation
in p.a. 215 deg.  L. Buzzi and F. Luppi (Varese, Italy, 0.60-m
f/4.6 reflector) note that their images on Aug. 24.05-24.10 show a
condensed 10" coma with a possible extension 6"-8" long in p.a. 225
deg.  A. C. Gilmore (Mt. John 1.0-m f/7.7 reflector) adds that his
images from Aug. 24.5 show a small, slightly condensed spot
slightly larger than nearby star images of similar brightness.

     2007 UT             R.A. (2000) Decl.       Mag.
     Aug. 21.65039    1 33 57.81   -17 49 48.2   19.4

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2007-Q20.

     T = 2006 Dec.  6.785 TT          Peri. = 276.821
                                      Node  =   6.578   2000.0
     q = 2.77670 AU                   Incl. =  79.553

     N. N. Samus, Institute of Astronomy, Russian Academy of
Sciences, informs us that this nova (cf. IAUC 8861, 8862; CBETs
1029, 1038) has been given the designation V458 Vul.
     Visual magnitude estimates by C. Labordena, Castello, Spain:
Aug. 12.856 UT, 9.1; 19.853, 8.6; 21.890, 10.1.  CCD magnitudes:
Aug. 22.483, R = 9.51 +/- 0.05 (E. Forne, L'Ampolla, Spain);
22.491, V = 10.48 +/- 0.07 (Forne); 23.003, B = 11.72 +/- 0.06
(Forne); 23.828, R = 9.10 +/- 0.16 (A. Ardanuy, Sabadell, Spain);
23.835, V = 11.02 +/- 0.09 (Ardanuy); 23.839, B = 11.45 +/- 0.11

                      (C) Copyright 2007 CBAT
2007 August 24                 (8863)            Daniel W. E. Green

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