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IAUC 7158: 1999ca; 1999by; 1999ac, 1999ad, 1999an, 1999be

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                                                  Circular No. 7158
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 1999ca IN NGC 3120
     S. Woodings, R. Martin, and A. Williams report their discovery
of an apparent supernova (R about 17) on a CCD image taken with the
Perth-Lowell 0.61-m reflector on Apr. 27.55 UT in the course of the
Perth Astronomy Research Group's automated supernova search at
Perth Observatory.  A further observation on Apr. 28.47 also showed
the new star at the same position.  The last previous image of the
field was taken on Apr. 2, with no object visible to mag about 19.
A. Verveer and J. Biggs provide the following position for SN
1999ca from an unfiltered CCD image obtained on Apr. 30.514 with
the 0.25-m Mike Candy Telescope at Perth Observatory:  R.A. =
10h05m22s.92 +/- 0s.02, Decl. = -34o12'41".3 +/- 0".2 (equinox
2000.0), which is about 35" north of the center of NGC 3120; the
magnitude was then 17.0.


SUPERNOVA 1999by IN NGC 2841
     C. Gerardy and R. Fesen, Dartmouth College, report that
optical CCD spectra (range 450-800 nm, resolution 0.5 nm) of SN
1999by (cf. IAUC 7156), obtained with the McGraw-Hill 1.3-m
telescope at MDM Observatory on May 2.2 UT, show it to be a type-Ia
supernova, about 10 days before maximum.  Absorption features are
observed at 485, 500, 546, 575, and 612 nm, with a strongly blue
continuum.
     CCD magnitude by D. Hanzl, Brno, Czech Republic (cf. IAUC
7157):  May 4.068 UT, V = 14.00 +/- 0.02.  Visual magnitude
estimates:  May 3.822, 13.8 (M. Lehky, Hradec Kralove, Czech
Republic); 3.849, 13.6 (K. Hornoch, Lelekovice, Czech Republic);
3.89, 14.3 (R. J. Bouma, Groningen, The Netherlands).


SUPERNOVAE 1999ac, 1999ad, 1999an, 1999be
     CCD magnitudes, unfiltered unless otherwise noted:  SN 1999ac
in NGC 6063, Apr. 8.691 UT, 16.0 (S. Yoshida and K. Kadota, Ageo
City, Japan); 13.722, 15.8 (Yoshida and Kadota); 14.678, 16.0
(Yoshida and Kadota); 19.092, V = 15.91 (D. Hanzl, Brno, Czech
Republic; comparison star GSC 945.845, V = 10.90, B-V = +0.678);
22.972, V = 16.1 +/- 0.1 (L. Kiss, G. Furesz, and B. Csak,
Piszkesteto, Konkoly Observatory, Hungary).  SN 1999ad in NGC 6063,
Mar. 21.13, 14.7 (S. Moretti, Forli, Italy).  SN 1999an in IC 755,
Mar. 13.657, 15.0 (Yoshida and Kadota); 19.962, V = 15.2 +/- 0.2
(Kiss and Csak).  SN 1999be in CGCG 089-013, Mar. 31.534, 16.5:
(Yoshida and Kadota); Apr. 13.675, 15.7 (Yoshida and Kadota);
16.662, 15.6 (Yoshida and Kadota).

                      (C) Copyright 1999 CBAT
1999 May 5                     (7158)            Daniel W. E. Green

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