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IAUC 7484: C/2000 Q1; C/2000 OF_8; 2000dg

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IAUC number 

                                                  Circular No. 7484
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2000 Q1 (SOHO)
     Further to IAUC 7445 and 7480, D. Biesecker reports positions
by D. Hammer for a comet found by J. Danaher in LASCO C3 images at
the SOHO website.  No tail is evident, and Biesecker provides some
V magnitude estimates (in addition to the discovery magnitude given
below):  Aug. 28.638 UT, 8.0; 28.846, 7.2; 29.071, 7.7; 29.279,
8.4; 29.513, 7.9; 29.779, 10.3.  The reduced measurements and
parabolic orbit by B. G. Marsden are given on MPEC 2000-Q42.

     2000 UT           R.A. (2000) Decl.       m1
     Aug. 28.473      10 48.1      + 8 38      8.6


COMET C/2000 OF_8 (SPACEWATCH)
     An object reported by Spacewatch as asteroidal (MPEC 2000-P03;
discovery observation below) appears slightly diffuse in individual
CCD images taken by O. R. Hainaut and C. E. Delahodde with the
ESO/MPI 2.2-m telescope on Aug. 29.00 UT (3"-4" coma extending
northeastward); the coma is clearly visible on a 30-min stacked
image.  D. D. Balam also now finds a 6" coma elongated in p.a. 260
deg in stacked images taken on Aug. 28.27 with the 1.82-m Plaskett
reflector.  See also MPEC 2000-Q43.

     2000 UT             R.A. (2000) Decl.        m2
     July 24.32235   20 57 31.48   - 7 08 18.3   21.3


SUPERNOVA 2000dg IN MCG +1-1-29
     S. Benetti, A. Zacchei, and I. Perez, Telescopio Nazionale
Galileo (TNG), report:  "A fully reduced CCD spectrum (range 382.4-
811.1 nm, resolution 1.3 nm), obtained on Aug. 28.13 UT with the
TNG reflector (+ D.o.lo.res spectrograph), shows SN 2000dg (cf.
IAUC 7480) to be a type-Ia supernova at maximum light.  The
spectrum consists of a blue continuum with superimposed P-Cyg lines
of Ca II (H and K), S II, and Si II ions.  The expansion velocity
deduced from minimum of the Si II 635.5-nm doublet is 10 850 km/s
(a recession velocity for the parent galaxy of 11 542 km/s was
obtained from the LEDA database)."
      A. V. Filippenko and W. D. Li, University of California,
Berkeley, report that inspection of a CCD spectrum (range
330-1000 nm), obtained on Aug. 27 UT with the Shane 3-m reflector
at Lick Observatory, also shows SN 2000dg to be of type Ia, near
maximum brightness.

                      (C) Copyright 2000 CBAT
2000 August 31                 (7484)            Daniel W. E. Green

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