Central Bureau for Astronomical Telegrams

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IAUC 8880: C/2007 T4; C/2007 T5

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IAUC number 

                                                  Circular No. 8880
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 T4 (GIBBS)
     A. R. Gibbs reports his discovery of a comet on unfiltered CCD
images obtained with the 0.68-m Schmidt telescope at Catalina
(discovery observation tabulated below), with four co-added 30-s
exposures showing a compact coma of size 8".5 x 6" with a tapered
25" tail in p.a. 305 deg.  Four 30-s images taken by R. A. Kowalski
with the Mt. Lemmon 1.5-m reflector on Oct. 14.5 UT show a coma of
diameter approximately 10" with a straight tail approximately 25"
long in p.a. 300 deg.  Following posting on the Minor Planet
Center's 'NEOCP' webpage, J. W. Young writes that his CCD images
taken with the Table Mountain 0.61-m telescope on Oct. 15.5 show a
round, 6"-diameter, diffuse coma with a small bright central core
and a 30" tail in p.a. 290 deg.

     2007 UT             R.A. (2000) Decl.       Mag.
     Oct. 12.46227    9 57 24.47   +34 12 33.6   18.4

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2007-T113.

     T = 2007 Aug. 11.396 TT          Peri. =  49.967
                                      Node  =  41.159   2000.0
     q = 2.19536 AU                   Incl. =  24.007


COMET C/2007 T5 (GIBBS)
     Gibbs also reports his discovery of another comet with a
diffuse 15" coma and a brighter 6"-diameter center (no visible
tail) on four co-added 30-s unfiltered Catalina Sky Survey
exposures (discovery observation tabulated below).  Kowalski adds
that four co-added 60-s exposures at Mt. Lemmon on Oct. 14.5 UT
show a strongly condensed coma of diameter 30"; his four co-added
75-s exposures on Oct. 15.5 show a condensed coma approximately 12"
across and an extended coma approximately 25" across with no
visible tail in poor seeing.  Young found a very faint diffuse
round coma of diameter 26" with no tail and very little central
condensation on his images from Oct. 15.5.

     2007 UT             R.A. (2000) Decl.       Mag.
     Oct. 13.45523    8 16 28.09   +19 11 10.5   18.2

The available astrometry, preliminary parabolic orbital elements (T
= 2008 Feb. 13.463 TT, q = 4.40844 AU, Peri. = 17.415 deg, Node =
110.115 deg, i = 44.126 deg, equinox 2000.0), and an ephemeris
appear on MPEC 2007-T114.

                      (C) Copyright 2007 CBAT
2007 October 15                (8880)            Daniel W. E. Green

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