THE ASTRONOMER Electronic Circular No 819 1994 Mar 10 22.00UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke,
Hants, RG22 4PP,England. Telephone/FAX(0256)471074 Int:+44256471074
TELEX: 9312111261 Answerback: TA G TELECOM GOLD: 10074:MIK2885
INTERNET: GMH at AST.STAR.RL.AC.UK or GMH at AST-STAR.CAM.AC.UK
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SUPERNOVA 1994C IN ANONYMOUS GALAXY
J. Mueller reports her discovery of a supernova of mag 17.5-18,
found on a blue plate taken on Mar. 5 UT with the 1.2-m Oschin
Schmidt Telescope by J. D. Mendenhall and herself in the course of
the second Palomar Sky Survey. SN 1994C is located at
R.A. = 7h53m08s.07, Decl. = +45o00'20".8 (equinox 1950.0);
the galaxy's centre is located at (end figures) 08s.27, 14".1. A
spectrogram obtained by S. Djorgovski, D. Thompson, and J. Smith on
Mar. 9 with the 5-m Hale Telescope (+ double spectrograph) confirms
that the object is a supernova.
IAUC 5946
SUPERNOVA 1994D IN NGC 4526
R. R. Treffers, A. V. Filippenko, and S. D. Van Dyk, University
of California at Berkeley; and M. W. Richmond, Princeton
University, report their discovery of a supernova in NGC 4526 (R.A.
= 12h31m31s, Decl. = +7o58'.5, equinox 1950.0), located about 9"
west and 7" north of the galaxy's nucleus: "The object was found
on Mar. 7 UT (R = 15.2 +/- 0.5) during the Leuschner Observatory
Supernova Search, which uses an automated 0.76-m telescope equipped
with the Lawrence Berkeley Laboratory CCD camera. Confirmation was
made with an image taken through thin fog on Mar. 9, and the object
appeared to be brighter than on Mar. 7. It could not be detected
to a limiting magnitude of R about 17 on Mar. 1. Inspection of
spectra (range 310-730 nm) obtained by A. Martel and R. W. Goodrich
(University of California at Santa Cruz) on Mar. 9 UT with the
Shane 3-m reflector at Lick Observatory reveals that the supernova
is of type Ia, probably about 1 week prior to maximum brightness.
The minimum of the Si II 635.5-nm trough is at 604 nm, yielding an
expansion velocity of roughly 15 000 km/s. The continuum is very
blue. This supernova could reach mag 11 to 12, since the parent
galaxy is in the Virgo cluster; further observations at all
wavelengths are urged."
IAUC 5946
Bjorn Granslo, Norway reports observations by Ornulf Midtskogen and
himself:
mv
1994 Mar 9.875UT, 13.4 O.Midtskogen 0.316-m M x260
1994 Mar 9.901UT, 13.7 B.H.Granslo 0.406-m M x208
Gary Poyner, Birmingham, UK reports observing a star, presumed to
be the supernova, at mag 13.0-13.5 on Mar 10.055UT.