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IAUC 6947: C/1998 M1; 1998cn; C/1995 O1

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                                                 Circular No. 6947
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 C/1998 M1 (LINEAR)
     Parabolic orbital elements from MPEC 1998-M05 (which included
prediscovery May 22 LINEAR observations):

     T = 1998 Oct. 29.2268 TT         Peri. =  19.8009
                                      Node  = 256.0651  2000.0
     q = 3.110467 AU                  Incl. =  20.3890

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
June 16    15 27.20   -25 03.6   2.454   3.375  150.4    8.5   15.2
     26    15 25.74   -23 46.9   2.491   3.339  140.6   11.1   15.2
July  6    15 26.06   -22 36.5   2.548   3.305  131.0   13.4   15.2
     16    15 28.29   -21 34.8   2.623   3.274  121.8   15.3   15.2
     26    15 32.43   -20 43.1   2.711   3.245  113.0   16.7   15.3

On June 17 and 18 UT, several CCD observers, including W. Offutt
(Cloudcroft, NM) and C. Hergenrother (Mount Hopkins), reported a
general asymmetrical coma and fan tail extending about 20" in p.a.
150-160 deg, then curving west-southwest toward p.a. 250 deg, where
it was about 15"-20" in width on June 17.15 (Offutt), continuing
for over 6' (Hergenrother).


SUPERNOVA 1998cn IN NGC 3735
     S. Jha, P. Garnavich, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
1998cn (cf. IAUC 6944), obtained by B. Carter on June 19.2 UT with
the Whipple Observatory 1.5-m telescope (+ FAST spectrograph),
shows the supernova to be of type Ia, about 3 weeks past maximum
light.  The host galaxy's recession velocity, as determined by
narrow emission lines, is 2800 km/s.


COMET C/1995 O1 (HALE-BOPP)
     Visual m_1 estimates:  May 18.47 UT, 8.4 (D. A. J. Seargent,
Cowra, N.S.W., 10x50 binoculars); 23.35, 9.3 (A. Hale, Loomberah,
N.S.W., 10x70 binoculars); 27.34, 8.5 (J. Seach, Chatsworth Island,
N.S.W., 10x50 binoculars); June 3.36, 9.4 (Seach, 0.25-m reflector);
17.38, 9.8 (M. Mattiazzo, Wallaroo, South Australia, 0.20-m
reflector).

                      (C) Copyright 1998 CBAT
1998 June 19                   (6947)            Daniel W. E. Green

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