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IAUC 6974: 1998dd; C/1998 M6; C/1998 M2

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                                                 Circular No. 6974
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
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1998dd IN ANONYMOUS GALAXY
     J. Maza, Department of Astronomy, University of Chile, reports
the discovery by R. Antezana, on a T-Max 400 film taken by L. E.
Gonzalez with the Maksutov telescope at Cerro El Roble on July
18.058 UT, of an apparent supernova (B about 17) located at R.A. =
13h47m33s.95, Decl. = -33o02'31".4 (equinox 2000.0), which is 2".8
east and 2".5 north of the nucleus of a ringed spiral galaxy.  SN
1998dd was confirmed on a film taken by Gonzalez using the same
telescope on July 19.133.  No star is visible at this position on a
film obtained on June 18.139 (B > 20).


COMET C/1998 M6 (LINEAR)
     Improved parabolic orbital elements from MPEC 1998-O05:

     T = 1998 Oct. 15.888 TT          Peri. =  10.047
                                      Node  = 306.603   2000.0
     q = 5.96988 AU                   Incl. =  91.554

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
July 16    20 44.95   -16 27.0   5.021   6.005  164.0    2.7   18.3
     26    20 35.94   -15 50.2   4.985   5.998  174.8    0.9   18.3
Aug.  5    20 26.83   -15 13.1   4.985   5.991  171.9    1.4   18.3
     15    20 18.02   -14 35.6   5.020   5.986  160.8    3.2   18.3
     25    20 09.88   -13 57.8   5.089   5.981  149.4    4.9   18.3
Sept. 4    20 02.71   -13 20.0   5.187   5.977  138.2    6.5   18.3


COMET C/1998 M2 (LINEAR)
     Ephemeris extension to IAUC 6949 (elements MPEC 1998-M31):

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
July 16    17 42.81   +12 49.8   1.926   2.742  135.2   15.1   13.8
     26    17 34.30   +15 04.5   2.005   2.733  126.4   17.4   13.9
Aug.  5    17 28.29   +16 44.6   2.101   2.728  118.0   19.2   14.0
     15    17 25.02   +17 56.2   2.209   2.727  110.0   20.4   14.1
     25    17 24.48   +18 45.8   2.324   2.730  102.6   21.2   14.2
Sept. 4    17 26.56   +19 20.2   2.442   2.736   95.9   21.5   14.3

Visual m_1 estimates:  June 28.29 UT, 13.4 (A. Hale, Cloudcroft,
NM, 0.41-m refl.); July 19.90, 14.0 (K. Hornoch, Lelekovice, Czech
Rep., 0.35-m refl.).

                      (C) Copyright 1998 CBAT
1998 July 21                   (6974)            Daniel W. E. Green

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