Central Bureau for Astronomical Telegrams
IAUC 7162: C/1999 J1; 1999bx; 1999bz
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 7163
.dvi or
.ps format.
Circular No. 7162
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)
COMET C/1999 J1 (SOHO)
D. A. Biesecker, SM&A Corporation and Goddard Space Flight
Center, reports observations of another apparent Kreutz sungrazing
comet that he discovered in images taken with both the C2 and C3
coronagraphs aboard SOHO. There was no tail evident, and on May
8.10 UT the comet's apparent total V magnitude was 5.8.
Astrometric measurements made by Biesecker (and reduced by B. G.
Marsden, Smithsonian Astrophysical Observatory), together with
orbital elements by Marsden, are given on MPEC 1999-J29.
1999 UT R.A. (2000) Decl.
May 7.804 3 04.8 +14 56
SUPERNOVA 1999bx IN NGC 6745
S. Jha, P. Garnavich, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
1999bx was obtained by P. Berlind with the Whipple Observatory
1.5-m telescope (+ FAST spectrograph) on May 6.5 UT. The low-
signal-to-noise spectrum exhibits a blue continuum, with hints of
broad H-alpha, H-beta, and He I emission, indicating that the
supernova is probably of type II at an early epoch. Narrow
emission lines of H-alpha, H-beta, and [O III] from the host galaxy
yield a recession velocity of 4720 km/s. An earlier spectrum,
obtained by E. Howell with the McDonald 2.1-m telescope on Apr. 29
UT, showed only a featureless blue continum.
SUPERNOVA 1999bz IN UGC 8959
Jha et al. also communicate: "Spectra of SN 1999bz were
obtained with the Whipple Observatory 1.5-m telescope (+ FAST
spectrograph) by P. Berlind on May 6.3 UT and by M. Calkins on May
8.3. The spectra show a flat continuum with broad (FWHM 12 000
km/s) absorption features, the most prominent of which is observed
at 638 nm. Given the NASA/IPAC Extragalactic Database recession
velocity for UGC 8959 of 25362 km/s, we identify this feature as Na
I. The spectra are, on the whole, similar to a spectrum of the
type-Ic SN 1994I at roughly 10 days past maximum light (Filippenko
et al. 1995, Ap.J. 450, L11). We thus conclude that SN 1999bz is
of type Ic, one to two weeks past maximum light. A spectrum of SN
1999bz is available at
http://cfa-www.harvard.edu/cfa/oir/Research/supernova/RecentSN.html."
(C) Copyright 1999 CBAT
1999 May 10 (7162) Daniel W. E. Green
Read IAUC 7163
.dvi or
.ps format.
Our Web policy. Index to the CBAT/MPC/ICQ pages.
