Central Bureau for Astronomical Telegrams
IAUC 7422: C/1999 C2 and C/2000 J3; 2000ce; V4334 Sgr
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Circular No. 7422
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)
COMETS C/1999 C2 and C/2000 J3
D. A. Biesecker, Emergent Information Technologies, Inc., and
Goddard Space Flight Center, reports observations of two more
Kreutz sungrazing comets found in SOHO LASCO C3 data. C/1999 C2
was found by Biesecker, and no tail is evident. C/2000 J3 was
found by K. Cernis and M. Boschat via the SOHO website; it is also
visible in C2 data, where a tail is evident, and Cernis estimates
m_1 about 7 on May 9.9 UT. Astrometry (measured by Biesecker and
D. Hammer, reduced by B. G. Marsden) and orbital elements appear on
MPEC 2000-J43 and 2000-J44.
Comet Date UT R.A. (2000.0) Decl.
C/1999 C2 1999 Feb. 6.099 21 35.2 -17 04
C/2000 J3 2000 May 9.725 3 16.0 +15 33
SUPERNOVA 2000ce IN UGC 4195
S. Jha, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum of SN 2000ce (cf.
IAUC 7417), taken by P. Berlind on May 10.14 UT with the F. L.
Whipple Observatory (FLWO) 1.5-m telescope (+ FAST spectrograph),
shows it to be a type-Ia supernova after maximum light, exhibiting
a relatively flat continuum with well-developed lines of Si II, S
II, Fe II, Mg II, and Ca II. Adopting the NASA/IPAC Extragalactic
Database recession velocity for the host galaxy (1591 km/s) yields
an expansion velocity for the supernova of 7600 km/s, measured via
the Si II (rest 635.5 nm) feature. The age of the supernova, based
on its spectral features (Riess et al. 1997, A.J. 114, 722), is 6
+/- 3 days after maximum light. Concurrent images of SN 2000ce
taken by P. Groot at the FLWO 1.2-m telescope yield B about 15.8
and V about 15.1.
V4334 SAGITTARII
R. Joyce and K. Hinkle, Kitt Peak National Observatory (KPNO),
report infrared photometry (uncertainty 0.1 mag or better) of V4334
Sgr (cf. IAUC 6322) obtained with narrowband filters at the KPNO
2.1-m telescope (+ Phoenix spectrograph in imaging mode) on Apr.
13.5 UT: [1.083 microns] = 13.8, [1.282 microns] = 13.6, [1.558
microns] = 11.0, [2.230 microns] = 7.0, [3.226 microns] = 4.0,
[4.651 microns] = 2.2. V4334 Sgr is slightly fainter at K, and
slightly brighter at L and M, than in 1999 Sept. (cf. IAUC 7266).
The infrared photometry, except for [1.083 microns], is consistent
with a 670-K blackbody.
(C) Copyright 2000 CBAT
2000 May 11 (7422) Daniel W. E. Green
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