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THE ASTRONOMER Electronic Circular No 1661      2001 Jly 30 13.10UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK             GMH at AST.STAR.RL.AC.UK
WORLD WIDE WEB                    http://www.demon.co.uk/astronomer
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SUPERNOVA 2001de IN UGC 12089 (Q2001/230)
T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
2001de (cf. TA E-Circular 1656:ed), obtained by P. Berlind on
July 24.42 UT with the Mt. Hopkins 1.5-m telescope (+ FAST
spectrograph), shows it to be a type-Ia supernova, about 1 week
after maximum light. Adopting the NED recession velocity of
9313 km/s for the host galaxy, the supernova expansion velocity is
about 10 600 km/s for Si II (rest 635.5 nm).  The spectral-feature
age of the supernova is 6 +/- 2 days after maximum light.

N. V. Borisov, A. N. Burenkov, V. V. Vlasuk, and A. G. Pramsky,
Special Astrophysical Observatory, report on their observations of
SN 2001de obtained with the 6-m telescope (+ long-slit spectrograph
+ CCD camera) on July 22.04 UT:  "A full reduction of the CCD
spectrogram (range 360-810 nm, dispersion 0.24 nm/pixel) shows
that this object is indeed a supernova.  The spectral features are
consistent with a peculiar type-Ia object.  The usual Si II feature
(635.5 nm) is much less deep than in normal type-Ia supernovae, if
compared with all of the other spectral lines.  The spectrum is
dominated by P-Cyg profiles, superimposed on a slightly blue
continuum.  The most prominent features are identified as Ca II H
and K, Si II, Mg II, and S II.  The expansion velocities measured
from the minima of Ca II H and K, Mg II 448.1-nm, and Si II
635.5-nm are 13 800, 11 400, and 11 000 km/s, respectively.  The
recession velocity of the parent galaxy, deduced from the emission
peak of the Si II 635.5-nm line, is 9700 km/s."
IAUC 7671 (extract)

Editor: We are pleased to see spectral confirmation of this
supernova discovered by Mark Armstrong and detailed on E-Circ 1656.

Guy M Hurst