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IAUC 8881: C/2007 T6; C/2007 F1; C/2007 T1

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IAUC number


                                                  Circular No. 8881
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 T6 (CATALINA)
     An apparently asteroidal object discovered by the Catalina Sky
Survey (discovery observation tabulated below), and posted on the
Minor Planet Center's 'NEOCP' webpage, has been found to show
cometary appearance by J. W. Young on his CCD frames taken on Oct.
14.5 UT with the Table Mountain 0.61-m f/16 Cassegrain reflector,
which show a slightly elongated coma, 8" x 12" in diameter, with a
short, faint 20" tail in p.a. 310 deg (the coma being elongated
perpendicular to the p.a. of the tail, more visible in short
exposures).  Young's exposures from Oct. 15.5 show the elongated,
bright coma (mag 17.2), with size and orientation of elongation the
same as seen on the previous night, but now with no hint of tail.

     2007 UT             R.A. (2000) Decl.       Mag.
     Oct. 13.47047    8 22 02.66   +17 42 00.0   17.8

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2007-T115.

     T = 2007 Aug. 24.944 TT          Peri. = 336.865
                                      Node  = 104.663   2000.0
     q = 2.38346 AU                   Incl. =  21.472


COMET C/2007 F1 (LONEOS)
     Visual total-magnitude estimates made with the comet generally
< 10 deg above the horizon:  Sept. 20.20 UT, 9.3 (J. J. Gonzalez,
Leon, Spain, 0.20-m reflector); 23.20, 8.7 (Gonzalez, 25x100
binoculars); Oct. 5.20, 6.9 (Gonzalez, 10x50 binoculars); 6.16, 7.2
(B. H. Granslo, Fjellhamar, Norway, 0.10-m refractor); 7.16, 6.7 (M.
Meyer, Ahlbach, Germany, 20x100 binoculars); 9.83, 7.0 (Y. Nagai,
Gunma, Japan, 20x100 binoculars); 13.75, 6.3 (Meyer, Eppenrod,
Germany); 14.80, 6.5 (Gonzalez).


COMET C/2007 T1 (McNAUGHT)
     Visual total-magnitude and coma-diameter estimates:  Oct.
10.09 UT, 11.7, 2'.5 (A. Hale, Cloudcroft, NM, U.S.A. 0.41-m
reflector); 12.43, 11.3, 3'.0 (M. Mattiazzo, Castlemaine, Victoria,
Australia, 0.28-m reflector); 13.81, 10.4, 3' (J. Carvajal, Avila,
Spain, 0.45-m reflector); 14.82, 10.3, 4' (J. J. Gonzalez, Leon,
Spain, 25x100 binoculars).

                      (C) Copyright 2007 CBAT
2007 October 15                (8881)            Daniel W. E. Green

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