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IAUC 8806: P/2007 C2; P/2007 B3

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IAUC number 

                                                  Circular No. 8806
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://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET P/2007 C2 (CATALINA)
     An apparent asteroidal object discovered by the Catalina Sky
Survey (discovery observation tabulated below), and posted on the
Minor Planet Center's 'NEOCP' webpage, has been reported by other
observers to show cometary appearance.  CCD images taken by H.-C.
Lin, C.-S. Lin, and Q.-z. Ye (Lulin Observatory 0.41-m f/8.8
Ritchey-Chretien telescope) on Feb. 10.55 UT show a small 3" coma
with an apparent tail around 5"-6" long in p.a. 70 deg.  G. Sostero
and E. Guido (Remanzacco, Italy, 0.45-m f/4.4 reflector) report
that a co-addition of ten unfiltered 180-s CCD exposures on Feb.
11.8 reveals the possible presence of a broad and faint tail almost
12" toward p.a. 340 deg.  D. T. Durig and W. R. O'Farrell (Sewanee,
TN, 0.30-m f/4 Schmidt-Cassegrain telescope) write that their CCD
images from Feb. 12.09-12.16 show a possible coma of diameter 1".5-
3", asymmetric to the north, with a possible tail 7"-9" long in
p.a. 255 deg.

     2007 UT             R.A. (2000) Decl.       Mag.
     Feb.  9.13925    3 00 14.90   +22 06 59.9   18.7

The available astrometry (including numerous prediscovery
observations, the oldest being made at Catalina back to 2006 Oct.
19), the following elliptical orbital elements, and an ephemeris
appear on MPEC 2007-C54.

                    Epoch = 2007 Sept.17.0 TT
     T = 2007 Sept. 4.5278 TT         Peri. = 179.4398
     e = 0.462035                     Node  = 276.1167  2000.0
     q = 3.780116 AU                  Incl. =   8.6748
       a =  7.026700 AU    n = 0.0529148    P =  18.626 years


COMET P/2007 B3 (GARRADD)
     Additional observations show that this comet (cf. IAUC 8801)
is of short period; orbital elements from MPEC 2007-C37:

     T = 2008 Apr.  8.305 TT          Peri. = 281.119
     e = 0.11751                      Node  = 327.829   2000.0
     q = 4.24543 AU                   Incl. =  28.825
       a =  4.81071 AU     n = 0.093409     P =  10.55 years

                      (C) Copyright 2007 CBAT
2007 February 12               (8806)            Daniel W. E. Green

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