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IAUC 7273: C/1999 T1; V1493 Aql

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                                                  Circular No. 7273
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 T1 (McNAUGHT-HARTLEY)
     Robert H. McNaught, Research School of Astronomy and
Astrophysics, Siding Spring Observatory, reports his discovery of a
comet on a plate taken by Malcolm Hartley with the 1.2-m U.K.
Schmidt Telescope.  The strongly condensed comet showed a 8" coma
and a very faint 1' tail in p.a. 320 deg.

     1999 UT             R.A. (2000) Decl.        m1
     Oct.  7.63654    2 04 29.25   -39 08 08.7    15
           7.68168    2 04 27.34   -39 08 31.8

Additional astrometry is published on MPEC 1999-T42.  I. P. Griffin,
Auckland Observatory, reports a condensed coma of diameter 7" on
CCD exposures taken on Oct. 11.4 UT (0.5-m telescope).  A. Becker
and C. Stubbs, University of Washington; and J. Perez, Cerro Tololo
Interamerican Observatory (CTIO) note a tail in p.a. 328 deg on a
CCD exposure taken with the CTIO 0.9-m telescope on Oct. 11.19.
     Preliminary parabolic orbital elements from MPEC 1999-T42:

     T = 2000 Dec.  9.634 TT          Peri. = 345.173
                                      Node  = 181.735   2000.0
     q = 1.15380 AU                   Incl. =  79.094

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct.  9     2 03.48   -39 20.5   4.608   5.329  132.1    8.0   15.6
     14     1 59.62   -40 03.8   4.575   5.283  130.9    8.2   15.5
     19     1 55.53   -40 43.1   4.548   5.236  129.3    8.5   15.5
     24     1 51.27   -41 17.9   4.527   5.189  127.2    8.8   15.4
     29     1 46.91   -41 47.9   4.511   5.142  124.7    9.1   15.4
Nov.  3     1 42.51   -42 12.8   4.501   5.094  121.9    9.5   15.3
      8     1 38.15   -42 32.5   4.495   5.047  118.8    9.9   15.3
     13     1 33.90   -42 46.9   4.493   4.999  115.5   10.3   15.3
     18     1 29.82   -42 56.0   4.496   4.951  112.0   10.7   15.2


V1493 AQUILAE
     CCD magnitude estimates, unfiltered unless otherwise noted:
Sept. 11.472 UT, 12.6 (S. Yoshida and K. Kadota, Ageo, Saitama,
Japan); 15.793, V = 14.94 +/- 0.01, B-V = +0.66 +/- 0.07 (D. Hanzl,
Brno, Czech Republic; cf. IAUC 7254); 26.7729, 13.83 (G. Masi,
Ceccano, Italy); Oct. 1.761, V = 15.45 +/- 0.05, B-V = +0.8 +/-
0.10 (Hanzl).

                      (C) Copyright 1999 CBAT
1999 October 11                (7273)            Daniel W. E. Green

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