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IAUC 7289: C/1999 T3; N IN IC 1613

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                                                  Circular No. 7289
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1999 T3 (LINEAR)
     Linkage at the Minor Planet Center of observations by LINEAR
(discovery observation below) on several nights during Oct. 3-21
revealed an object with a nearly-parabolic retrograde orbit.  This
orbit also represented a single-night detection of an object by E.
W. Elst and S. Ipatov at Uccle on Oct. 18.  Following placement of
an ephemeris on The NEO Confirmation Page further observations were
made on Oct. 24 and 25.  In response to enquiries, Elst remarked
that the object was diffuse and had a possible tail to the north;
J. Ticha and M. Tichy, Klet, reported the object as slightly more
diffuse than stars of comparable brightness and deduced a coma size
of 9"; and D. Durig, Sewanee, TN, in poor conditions (strong wind,
full moon), also noted the object's diffuse appearance.

     1999 UT             R.A. (2000) Decl.        m2
     Oct.  3.33731    3 09 03.31   +22 06 48.3   18.3

     Astrometry and the following parabolic orbital elements appear
on MPEC 1999-U27:

     T = 2000 Aug. 29.1385 TT         Peri. = 210.9351
                                      Node  = 223.5095  2000.0
     q = 5.370459 AU                  Incl. = 104.6325

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct. 19     2 58.44   +19 46.6   4.920   5.851  157.1    3.8   17.1
     29     2 50.74   +18 06.5   4.843   5.822  169.3    1.8   17.1
Nov.  8     2 42.77   +16 21.1   4.804   5.795  178.1    0.3   17.0
     18     2 34.92   +14 33.7   4.804   5.768  165.8    2.4   17.0
     28     2 27.60   +12 48.1   4.843   5.742  153.4    4.4   17.0
Dec.  8     2 21.13   +11 07.8   4.915   5.716  141.2    6.2   17.0
     18     2 15.78   + 9 35.5   5.018   5.692  129.2    7.7   17.1
     28     2 11.68   + 8 13.0   5.144   5.668  117.6    8.8   17.1


NOVA IN IC 1613
     M. M. M. Santangelo reports that prediscovery CCD frames
(limiting mag R about 20.0), taken on Sept. 11.09 UT with the
Monte Agliale 0.51-m reflector, show the nova in IC 1613 (cf. IAUC
7287) at R = 19.1; his astrometry yields R.A. = 1h04m49s.04, Decl.
= +2o05'29".1 (equinox 2000.0).

                      (C) Copyright 1999 CBAT
1999 October 25                (7289)            Daniel W. E. Green

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