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IAUC 8877: C/2007 T1; 191P; P/2007 R5 = 1999 R1 = 2003 R5 (SOHO)

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IAUC number

                                                  Circular No. 8877
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)

     R. H. McNaught reports his discovery of a comet (discovery
observation tabulated below) on CCD images obtained with the 0.5-m
Uppsala Schmidt telescope in the course of the Siding Spring survey;
the object showed a 2'.0 coma, slightly extended in p.a. 80 deg,
with moderate to strong condensation.  Following posting on the
Minor Planet Center's 'NEOCP' webpage, numerous other astrometric
CCD observers have commented on the object's cometary appearance,
including L. Donato and V. Gonano, Remanzacco, Italy (0.45-m f/4.4
reflector, Oct. 9.72 UT; thirty co-added 10-s exposures obtained in
twilight show a coma nearly 30" in diameter with a sharp central
condensation and a fan tail almost 40" long toward p.a. 45 deg);
E. Pettarin, G. Lombardi, and L. Bittesini, Farra d'Isonzo, Italy
(0.40-m f/4.5 reflector, Oct. 9.73; 25" diffuse coma in a poor sky);
F. Hormuth, Heidelberg-Koenigstuhl (0.70-m reflector, Oct. 9.73-
9.74; coma diameter approximately 20"; stacked R-band images
totalling 300 s show the coma slightly elongated toward the east);
M. Tichy, M. Honkova, and J. Ticha, Klet (0.57-m f/5.2 reflector,
Oct. 9.76-9.77; coma diameter > 25"); and P. Birtwhistle, Great
Shefford, Berkshire, England (0.40-m f/6 Schmidt-Cassegrain
reflector, Oct. 9.77-9.78; 20" concentrated coma with a 75" tail
in p.a. 80 deg).

     2007 UT             R.A. (2000) Decl.       Mag.
     Oct.  9.42315   17 18 17.19   - 9 37 17.5   12.8

The available astrometry, the following very preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2007-T54.

     T = 2007 Nov. 23.742 TT          Peri. = 284.051
                                      Node  = 136.922   2000.0
     q = 0.30498 AU                   Incl. =  68.327

     Comet P/2007 N1 = P/2000 P3 (cf. IAUC 8855, 8866) has been
assigned the permanent number 191P (cf. MPC 60617).

P/2007 R5 = 1999 R1 = 2003 R5 (SOHO)
     Regarding IAUC 8872, lines 16-18, the brightness peak in 2007
actually occurred shortly before perihelion.

                      (C) Copyright 2007 CBAT
2007 October 9                 (8877)            Daniel W. E. Green

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