Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 7373: 2000M; 2000L; C/1999 S4

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 7372  SEARCH Read IAUC 7374

View IAUC 7373 in .dvi or .ps format.
IAUC number

                                                  Circular No. 7373
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)

     A. Dimai, Cortina d'Ampezzo, Italy, reports the discovery of
an apparent supernova (mag 16.5-17.0) by Marco Migliardi from
unfiltered CCD images taken on Feb. 27.17 and 27.20 UT during the
Col Druscie Remote Observatory Supernova Search with the 0.5-m
reflector.  A third image showing the new object was obtained by
Migliardi on Feb. 28.186.  H. Yamaoka, Kyushu University, reports
his measurement of the position of SN 2000M from Migliardi's
discovery image:  R.A. = 17h32m39s.61, Decl. = +16o23'54".9
(equinox 2000.0); Migliardi reports that the new object is 3" west
and 13" south of the nucleus of NGC 6389.  An unfiltered image
taken on 1999 July 24 shows nothing at the position of SN 2000M
(limiting mag about 19.0), and it does not appear on the Palomar
Sky Survey.  W. Li, University of California at Berkeley, writes
that he obtained a confirmation image of SN 2000M at mag about 16.8
(unfiltered) with the Katzman Auotmatic Imaging Telescope (KAIT) on
Mar. 1.5 UT.  The position end figures of the new object are
39s.67, 54".1, being offset 1".6 west and 12".6 south from the
nucleus of NGC 6389.  A KAIT image of the field taken on 1999 Sept.
11 showed nothing at the position of SN 2000M (limiting mag about

     S. Jha, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum of SN 2000L,
obtained by M. Calkins on Mar. 1.3 UT with the F. L. Whipple
Observatory 1.5-m telescope (+ FAST spectrograph), reveals it to be
a type-II supernova.  The spectrum exhibits a blue continuum with
P-Cyg Balmer lines.  Narrow superimposed H-alpha emission yields a
recession velocity of 3370 km/s for the host galaxy.  The supernova
expansion velocity, measured to the trough of the H-beta line
profile, is 5300 km/s.

     Visual m_1 estimates:  1999 Dec. 30.34 UT, 14.3 (N. Biver,
Oahu, HI, 0.26-m reflector); 2000 Jan. 8.75, 14.6 (W. Hasubick,
Buchloe, Germany, 0.44-m reflector); Feb. 2.80, 13.5 (R. J. Bouma,
Groningen, The Netherlands, 0.25-m reflector); 29.24, 13.4 (M.
Linnolt, Haiku, HI, 0.20-m refl.).

                      (C) Copyright 2000 CBAT
2000 March 1                   (7373)            Daniel W. E. Green

Read IAUC 7372  SEARCH Read IAUC 7374

View IAUC 7373 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!