Central Bureau for Astronomical Telegrams
IAUC 7046: 1998eo, 1998ep, 1998eq; 1998er
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Circular No. 7046
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVAE 1998eo, 1998ep, 1998eq
G. Aldering, Lawrence Berkeley National Laboratory, on behalf
of the Supernova Cosmology Project (cf. IAUC 6804), reports the
discovery of three type-Ia supernovae, all found as part of their
high-redshift supernova search on the Keck II telescope:
SN 1998 UT R.A. (2000) Decl. I z Offset
1998eo Oct. 15 4 56 15.47 - 3 46 38.7 23.6 0.84 34" W, 24" S
1998ep Oct. 15 23 19 57.67 +16 03 19.5 20.1 0.11 near center
1998eq Oct. 15 23 20 27.47 +15 55 43.7 24.8 1.20 near center
The supernova spectra were obtained at the Keck II telescope on
Oct. 27. The redshifts were determined from host-galaxy emission
and absorption lines. Both SN 1998eo and SN 1998eq are within 1"
of the host-galaxy center. I-band photometry of the lightcurves is
being obtained from the ground for all supernovae with determined
redshifts, and SN 1998eq and SN 1998eo have been observed in the I
band with the Hubble Space Telescope; J-band photometry for SN
1998eo has been obtained with NICMOS on the HST. The spectrum of SN
1998ep indicates that it was roughly two weeks after maximum on Oct.
27, while the spectra of SN 1998eo and SN 1998eq indicate they were
near maximum.
SUPERNOVA 1998er IN GH 9-2
A. Becker, University of Washington, on behalf of the MACHO
Collaboration, reports the discovery of an apparent supernova,
possibly before maximum brightness, in the LMC background galaxy GH
9-2: "The object is question was initally announced as an on-going
microlensing event (MACHO Alert 98-LMC-4) on an object located at
R.A. = 5h50m16s.87, Decl. = -71o14'13".5 (equinox 2000.0).
Inspection of the images shows that this object is superimposed on
the outer visible edge of the background galaxy GH 9-2, identified
in Gurwell and Hodge (1990, PASP 102, 849), and is therefore likely
a supernova. The morphology of GH 9-2 suggests that this is a
late-type SBb galaxy, and SN 1998er is located 10".5 west and 4".8
north of the galaxy nucleus. Images confirming this object's
brightening were taken with the Cerro Tololo 0.9-m telescope on Nov.
3.346 and 4.342 UT. As of Nov. 4.491, the object was at magnitudes
R = 17.4 and V = 18.6. A finding chart and additional information
are available by anonymous ftp at
darkstar.astro.washington.edu:/macho/Alerts/98-LMC-4 or at the WWW
site http://darkstar.astro.washington.edu."
(C) Copyright 1998 CBAT
1998 November 5 (7046) Daniel W. E. Green
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