Central Bureau for Astronomical Telegrams
IAUC 7088: 1999C; 1999D; 1999B
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Circular No. 7088
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 1999C IN ANONYMOUS GALAXY
A. Gal-Yam and D. Maoz, Tel Aviv University, report for the
Wise Observatory Optical Transients Search (see IAUC 7055) their
discovery of an apparent supernova on unfiltered CCD images taken
with the Wise Observatory 1-m telescope on Jan. 14. SN 1999C (R =
19.6) is located at R.A. = 10h08m51s.21, Decl. = +71o10'42".9
(equinox 2000.0), which is in the field of the galaxy cluster Abell
914 (z = 0.195). The object is located 0".9 east of, and at the
same Decl. as, the host galaxy's center. SN 1999C was invisible in
images obtained on 1998 Mar. 31 (limiting mag R about 22.0). The
object was already detectable in images obtained on 1998 Dec. 23 (R
= 19.8) and was confirmed on CCD images taken by A. Gal-Yam on 1999
Jan. 15 with the same telescope. Finding charts can be obtained
via ftp://wise-obs.tau.ac.il/pub/avishay/SN/sn1999#.
SUPERNOVA 1999D IN NGC 3690
Y. L. Qiu, Q. Y. Qiao, and J. Y. Hu, Beijing Astronomical
Observatory (BAO), report their discovery of an apparent supernova
in the course of the BAO Supernova Survey with the 0.6-m telescope
at Xinglong Station. The new star is located at R.A. =
11h28m29s.50, Decl. = +58o33'40".6 (equinox 2000.0), which is about
14".1 west and 12".6 north of the bright knot of the western part
of NGC 3690 (cf. IAUC 6859; note that SN 1998T was near the center
of NGC 3690). The object was found and confirmed on unfiltered CCD
images taken on Jan. 16.83 and 17.65 UT that show magnitudes of
15.6 and 15.3, respectively. CCD frames taken on 1998 Dec. 30 show
no star at the position of the supernova (limiting mag about 18.0).
W.-d. Li, University of California at Berkeley, reports that KAIT
images show the presence of SN 1999D already on 1999 Jan. 11.
SUPERNOVA 1999B IN UGC 7189
S. Jha, P. Garnavich, P. Challis, and R. Kirshner, Center for
Astrophysics, report that a spectrum of SN 1999B (cf. IAUC 7086),
obtained on Jan. 16.5 UT by M. Calkins with the F. L. Whipple
Observatory's 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 and a weak He I (rest wavelength 587.6 nm)
absorption. Adopting the NASA/IPAC Extragalactic Database
recession velocity for UGC 7189 of 1683 km/s implies a photospheric
expansion velocity of 6700 km/s for the supernova, measured to the
trough of the H-alpha line profile.
(C) Copyright 1999 CBAT
1999 January 18 (7088) Daniel W. E. Green
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