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IAUC 7252: 1999do; C/1999 J3; C/1995 O1

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                                                  Circular No. 7252
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)


SUPERNOVA 1999do IN MARKARIAN 922
     D. C. Leonard, R. T. Chornock, and A. V. Filippenko,
University of California at Berkeley, report that a CCD spectrogram
(range 330-1000 nm), obtained on Sept. 10 UT with the Shane 3-m
reflector at Lick Observatory, reveals that SN 1999do (cf. IAUC
7242) is of type Ia.  Prominent absorption lines of Ca II (H and K)
and Si II (635.5 nm), corrected by the redshift of the parent
galaxy (6400 km/s), imply expansion velocities of about 13 000 and
11 000 km/s, respectively.  A type-Ia spectral aging algorithm
(Riess et al. 1997, A.J. 114, 722) gives an age of 9 days past
maximum.


COMET C/1999 J3 (LINEAR)
     Ephemeris from orbital elements on MPC 35553:

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Sept. 9     8 34.85   +46 29.3   1.207   0.997   52.6   53.4    9.4
     14     8 29.48   +43 10.7   1.098   0.983   55.5   57.5    9.1
     19     8 23.72   +39 05.3   0.985   0.978   58.9   61.6    8.9
     24     8 17.50   +33 53.7   0.871   0.980   62.6   65.3    8.6
     29     8 10.64   +27 07.8   0.761   0.989   66.7   68.4    8.4
Oct.  4     8 02.82   +18 08.8   0.660   1.007   71.3   70.3    8.1
      9     7 53.52   + 6 13.5   0.576   1.030   76.5   70.5    7.9

     Visual m_1 estimates:  Aug. 25.08 UT, 9.5 (M. Reszelski,
Szamotuly, Poland, 20x60 binoculars); Sept. 6.07, 8.9 (J. Kysely,
Vlasim, Czech Republic, 7x50 binoculars); 8.08, 9.0 (B. H. Granslo,
Fjellhamar, Norway, 0.07-m refractor); 9.10, 9.6 (W. Hasubick,
Buchloe, Germany, 25x100 binoculars); 10.88, 10.0 (V. S. Nevski,
Vitebsk, Belarus, 0.30-m reflector).


COMET C/1995 O1 (HALE-BOPP)
     Ephemeris from orbital elements on MPC 35204:

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Sept. 9     7 02.82   -68 48.8   9.329   9.300   85.3    6.2   12.5
     19     7 07.07   -69 56.5   9.415   9.375   84.7    6.1   12.6
     29     7 09.7    -71 06.4   9.502   9.449   84.0    6.1   12.6
Oct.  9     7 10.3    -72 16.9   9.589   9.523   83.2    6.0   12.7
     19     7 08.6    -73 26.4   9.677   9.597   82.4    5.9   12.8
     29     7 04.2    -74 32.8   9.765   9.670   81.6    5.8   12.8

                      (C) Copyright 1999 CBAT
1999 September 11              (7252)            Daniel W. E. Green

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