Central Bureau for Astronomical Telegrams
IAUC 7910: 2002by; C/2002 C1; 2002da
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Circular No. 7910
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)
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Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVA 2002by IN ESO 139-G34
M. Salvo and B. Schmidt, Research School of Astronomy and
Astrophysics, Australian National University (ANU), and Mt. Stromlo
Observatory, report that a spectrum (range 380-920 nm, resolution
about 0.4 nm) of SN 2002by (cf. IAUC 7865, 7866), taken with the
ANU 2.3-m telescope (+ double-beam spectrograph) at Siding Spring
Observatory on May 18.53 UT, shows that this object is a somewhat
unusual type-I supernova a few weeks past maximum light. E.
Cappellaro, Osservatorio Astronomico di Capodimonte, comments that
this spectrum closely resembles that of the type-Ia SN 1997bp about
5 weeks past maximum light. SN 1997bp is a peculiar type-Ia
supernova, in that it was polarized near optical maximum (see Wang
et al. 1998, Bull. AAS 30, 1325), an uncommon characteristic in
type-Ia supernovae that indicates an asphericity in the ejecta.
Radio observations of SN 2002by obtained by P. Price, E. Berger, J.
Chapman, and J. Harnett at the Australia Telescope Compact Array on
May 19 show no source detected at the position of the supernova,
down to a 3-sigma limit of 0.2 mJy. Salvo et al. conclude that SN
2002by is a spectroscopically peculiar type-Ia event, approximately
2 months past maximum light.
COMET C/2002 C1 (IKEYA-ZHANG)
A. Lecacheux, Observatoire de Paris; and N. Biver, European
Space Agency, ESTEC, on behalf of the Odin Solar System Topical
Team and of the Odin Team, report: "The Odin submillimetric space
telescope observed water lines in comet C/2002 C1 with a high
spectral resolution (80 m/s) from Apr. 21.9 to 28.3 UT. The H_2O
110-101 line at 556.936 GHz was detected with a peak integrated
line intensity of 21.6 K km s**-1 on Apr. 26.8 inside the 2' Odin
beam. This corresponds to a preliminary water-production rate of
1.7 x 10**29 molecules/s, taking into account opacity effects. The
110-101 line at 547.676 GHz of the (**18)O isotopic variety of water
was also detected. The average of Apr. 23.7-28.1 observations
yields an integrated line intensity of 0.24 +/- 0.02 K km s**-1.
Within model uncertainties, the inferred H_2**(18)O production rate
is consistent with the terrestrial **(16)O/**(18)O ratio."
SUPERNOVA 2002da
W. M. Wood-Vasey refines the limiting magnitude for the May 3
images (cf. IAUC 7905, last line) to be 20.8.
(C) Copyright 2002 CBAT
2002 May 28 (7910) Daniel W. E. Green
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