Central Bureau for Astronomical Telegrams
IAUC 5956: 1994F, 1994G, 1994H; 1993v
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Circular No. 5956
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
SUPERNOVAE 1994F, 1994G, 1994H
S. Perlmutter, C. Pennypacker, G. Goldhaber, A. Goobar, R.
Pain, B. Grossan, A. Kim, M. Kim, and I. Small, Lawrence Berkeley
Laboratory and the Center for Particle Astrophysics, Berkeley,
report three discoveries from a search for pre-maximum-light, high-
redshift supernovae by themselves and R. McMahon, Institute of
Astronomy, Cambridge; P. Bunclark, D. Carter, and M. Irwin, Royal
Greenwich Observatory; M. Postman and W. Oegerle, Space Telescope
Science Institute; T. Lauer, National Optical Astronomy Observatory;
and J. Hoessel, University of Wisconsin. Following are given the
designation, date of first detection, discovery magnitude and
telescope (INT = 2.5-m Isaac Newton Telescope; KPNO = 4-m Kitt
Peak telescope), supernova position for equinox 1950.0, offsets
from the host galaxy's center, and date of the previous image of
the galaxy not showing the supernova (to limiting mag about 24):
SN 1994F, Jan. 9, R = 22.0, INT, R.A. = 11h47m25s.15, Decl. =
+10o59'38".8, 1".1 west, 0".2 north, 1993 Dec. 22; SN 1994G, Feb.
13, I = 21.8, KPNO, R.A. = 10h16m17s.38, Decl. = +51o07'23".5, 1".4
east, 0".1 north, 1994 Jan. 16; SN 1994H, Jan. 8, R = 21.9, INT,
R.A. = 2h37m32s.22, Decl. = -1o46'57".5, 1".2 west, 0".1 south,
1993 Dec. 20. On Jan. 18, spectra of SN 1994F were obtained by J.
B. Oke with the Keck Telescope Low Resolution Imaging Spectrograph;
the host galaxy redshift is 0.354, and the spectrum of SN 1994F
matched that of a type-Ia supernova a week past maximum light. On
Mar. 9 and 10, spectra of SN 1994G were obtained by A. Riess, P.
Challis, and R. Kirshner at the Multiple Mirror Telescope, in which
emission lines of [O II] and [O III] from the host galaxy give a
redshift of z = 0.425; the spectrum of the SN 1994G, though noisy,
is consistent with a type-I supernova about a week past maximum
light. SN 1994H was observed on numerous nights from Jan. 10 to
Feb. 16 at the INT, at Kitt Peak by G. Jacoby and others, at the
European Southern Observatory by M. Turrato, and at Siding Spring
Observatory by M. Dopita; the resulting photometry is consistent
with a type-Ia supernova at an implied redshift of about 0.32 (the
host galaxy is on the periphery of a cluster with that redshift),
with maximum light around Jan. 12.
COMET McNAUGHT-RUSSELL (1993v)
Total visual magnitude estimates by R. Keen, Mt. Thorodin, CO
(7x50 binoculars): Mar. 10.09 UT, 7.6 (20' coma); 22.12, 6.6.
1994 March 24 (5956) Daniel W. E. Green
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