Central Bureau for Astronomical Telegrams
IAUC 7109: 1999ab; 1999aa
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Circular No. 7109
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)
SUPERNOVA 1999ab IN ANONYMOUS GALAXY
M. Schwartz, Cottage Grove, OR, reports his discovery of a
supernova (mag 18.3) on a CCD image taken on Feb. 8.5074 UT with
the Tenagra I internet-controlled 0.35-m supernova patrol telescope
in Sonoita, AZ. SN 1999ab is located at R.A. = 10h25m00s.64, Decl.
= +53o52'37".0 (equinox 2000.0), which is 4".8 east and 6".6 north
of the host galaxy's center.
A. Goobar, Stockholm University; I. M. Hook, Royal
Observatory, Edinburgh; and G. Aldering and P. Nugent, Lawrence
Berkeley National Laboratory, report that CCD spectra taken with
the Nordic Optical Telescope on Feb. 13 UT show that SN 1999ab (at
V = 18.5) is a type II-supernova about 1-2 months after maximum
light. Strong H-beta and H-alpha lines are present. The redshift
of the host galaxy was determined through H-alpha, H-beta, and O
III lines, placing it and the supernova at 9400 km/s. This
supernova was also confirmed with photometric U,B,V,R images taken
by E. Gates at the Lick 1.0-m telescope on Feb. 13.
SUPERNOVA 1999aa IN NGC 2595
Q. Y. Qiao, J. Y. Wei, Y. L. Qiu, and J. Y. Hu, Beijing
Astronomical Observatory (BAO), report their independent discovery
of SN 1999aa (cf. IAUC 7108) during the course of the BAO supernova
survey with the 0.6-m telescope at Xinglong station, providing a
position of R.A. = 8h27m42s.11, Decl. = +21o29'15".5 (equinox
2000.0), which is about 1".4 east and 31".0 north of the nucleus of
NGC 2595. Unfiltered CCD images taken on Feb. 11.6 and 12.6 UT
show SN 1999aa at mag about 16.3 and 16.0, respectively, but it was
not present on similar images obtained on Jan. 15 and Feb. 5.
S. Nakano, Sumoto, Japan, reports the independent discovery of
SN 1999aa by R. Kushida (Yatsugatake South Base Observatory) at V =
15.5 on Feb. 13.663 UT on a CCD image (limiting mag 19) obtained
with a 0.40-m f/6.3 Schmidt-Cassegrain reflector, from which Y.
Kushida measured the following position end figures for the
supernova: 42s.13, 15".5 (or 1".7 east and 30".8 north of the
galaxy's center). R. Kushida notes that dozens of past exposures
taken between 1995 and 1999 show nothing at this position, the most
recent being obtained on 1999 Jan. 21 (limiting mag 17.5).
M. Villi, Forli, Italy, reports that an unfiltered CCD image
(limiting mag 18) obtained on Feb. 6.91 UT shows nothing at the
position of SN 1999aa.
(C) Copyright 1999 CBAT
1999 February 15 (7109) Daniel W. E. Green
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