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IAUC 6960: 1998 M6; 1998cs; C/1998 J1

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                                                 Circular No. 6960
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)


COMET 1998 M6
     J. Montani reports his discovery of a comet visually on the
image-display monitor during the course of routine scanning with
the Spacewatch 0.9-m telescope at Kitt Peak.  A hint of a very
faint fan-shaped tail of length about 10"-20" lies in p.a. 175-200
deg.  The coma diameter measured 6" and 8" on June 30 and July 1,
respectively.  Available astrometry:

     1998 UT             R.A. (2000) Decl.        m1
     June 30.34038   20 57 58.45   -17 24 09.2   18.9
          30.36233   20 57 57.44   -17 24 04.7   18.9
          30.38417   20 57 56.42   -17 23 59.2   19.0
     July  1.35790   20 57 11.23   -17 20 25.9   19.0
           1.37000   20 57 10.63   -17 20 23.3   18.7
           1.44301   20 57 07.19   -17 20 07.4   18.7
           1.45423   20 57 06.64   -17 20 05.2   18.9


SUPERNOVA 1998cs IN UGC 10432
     S. Jha, P. Garnavich, P. Challis, and R. Kirshner, Center for
Astrophysics, report:  "A spectrum taken by K. Rines with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST spectrograph) on July
1.2 UT shows SN 1998cs (cf. IAUC 6957) to be a type-Ia supernova
before maximum light.  Zabludoff et al. (1990, Ap.J. Suppl. 74)
give a recession velocity for UGC 10432 of 9762 +/- 43 km/s, which
yields a high expansion velocity of 17 500 km/s (measured using the
prominent Si II 635.5-nm feature)."


COMET C/1998 J1 (SOHO)
     Ephemeris extension to IAUC 6930 (orbital elements MPC 31893):

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
July  6     8 44.29   -41 32.6   1.555   1.517   68.7   38.6    8.5
     11     8 59.85   -43 27.5   1.654   1.610   69.5   36.3    8.8
     16     9 14.88   -45 11.1   1.754   1.700   70.0   34.2    9.1
     21     9 29.48   -46 45.7   1.854   1.788   70.2   32.3    9.4
     26     9 43.70   -48 13.1   1.955   1.874   70.2   30.7    9.6
     31     9 57.60   -49 34.8   2.056   1.958   70.1   29.2    9.8
Aug.  5    10 11.22   -50 51.8   2.157   2.041   69.7   27.8   10.0
     10    10 24.60   -52 04.8   2.257   2.122   69.3   26.5   10.2
     15    10 37.80   -53 14.5   2.358   2.202   68.6   25.4   10.4

                      (C) Copyright 1998 CBAT
1998 July 1                    (6960)            Daniel W. E. Green

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