Central Bureau for Astronomical Telegrams
IAUC 7444: 2000cq; 2000cr; CI Aql; C/1999 S4
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Circular No. 7444
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)
SUPERNOVA 2000cq IN UGC 10354
A. V. Filippenko and A. L. Coil, University of California at
Berkeley, report that a CCD spectrum (range 320-1000 nm) of SN
2000cq (cf. IAUC 7442), obtained on June 27 UT with the Shane 3-m
reflector at Lick Observatory, reveals a broad H-alpha emission
line at recession velocity 9000 km/s, equal to that listed by NED
for the host galaxy. The H-alpha absorption component in this
type-II supernova is weak, however.
SUPERNOVA 2000cr IN NGC 5395
R. T. Chornock, A. V. Filippenko, A. L. Coil, and D. C.
Leonard, University of California at Berkeley, write: "Inspection
of a fully calibrated CCD spectrum (range 420-690 nm) of SN 2000cr
obtained on June 27 UT with the Shane 3-m reflector at Lick
Observatory reveals that it does not seem to be a type-II supernova
as suggested by Jha et al. (IAUC 7443). There is no clear broad
H-alpha emission, but a weak absorption trough at rest wavelength
637 nm may correspond to H-alpha with an expansion velocity of 9000
km/s. An even broader absorption trough at rest wavelength 613 nm
might be Si II with an expansion velocity of 11 000 km/s, yet it is
difficult to understand physically how this could exceed the
H-alpha velocity. Another absorption line is at rest wavelength
434 nm. Finally, there is a very broad (FWHM = 30 nm) absorption
trough centered on 487 nm, with perhaps two distinct minima at 480
and 493 nm. Among the spectra in our existing database, the
spectrum of SN 2000cr most closely resembles that of the type-Ic
supernova 1987M about a week past maximum brightness (Filippenko
1997, ARAA 35, 309), though SN 2000cr is probably younger. We
surmise that SN 2000cr is a very young type-Ic supernova."
CI AQUILAE
CCD photometry by D. Hanzl, Brno, Czech Republic (Hipparcos
comparison star HIP 92546): May 7.031 UT, V = 8.85 +/- 0.02, B-V =
+0.69 +/- 0.02, V-I = +1.79 +/- 0.03; 17.007, 9.51 +/- 0.03, +0.74
+/- 0.02, +1.67 +/- 0.02; June 20.952, 12.49 +/- 0.03, +0.44 +/-
0.06, +1.38 +/- 0.02.
COMET C/1999 S4 (LINEAR)
Visual m_1 and coma-diameter estimates: June 18.00 UT, 8.4, 4'
(M. Reszelski, Szamotuly, Poland, 20x60 binoculars); 23.93, 8.5, 4'
(A. Baransky, Kiev, Ukraine, 12x80 binoculars); 25.98, 7.8, 5'
(Reszelski).
(C) Copyright 2000 CBAT
2000 June 28 (7444) Daniel W. E. Green
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