Central Bureau for Astronomical Telegrams
IAUC 8016: 2002hy; 2002gf, 2002gg,, 2002hx; V838 Mon
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 8017
.dvi or
.ps format.
Circular No. 8016
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVA 2002hy IN NGC 3464
L. A. G. Monard, Pretoria, South Africa, reports the discovery
of an apparent supernova (mag 16.4 +/- 0.3) on unfiltered CCD
images taken on Nov. 12.098 UT with a 0.30-m reflector; it was
confirmed at the same brightness on an image taken on Nov. 14.084.
SN 2002hy is located at R.A. = 10h54m39s.18, Decl. = -21o03'41".2
(equinox 2000.0), which is 14".8 west and 17".0 north of the
nucleus of NGC 3464. Nothing is visible at this location on the
Digitized Sky Survey (limiting red mag 19.5) or on an image taken
by Monard on 2002 Oct. 13.104 (limiting mag 18.0). SN 2002J (cf.
IAUC 7800) also appeared in NGC 3464.
SUPERNOVAE 2002gf, 2002gg, AND 2002hx
A. V. Filippenko and R. Chornock, University of California,
Berkeley, report that inspection of CCD spectra (range 310-1000 nm)
obtained on Nov. 11 UT with the Keck I 10-m telescope (+ LRIS)
shows that SN 2002gf and SN 2002gg (IAUC 7990) are of type Ia,
about 1-1.5 months past maximum brightness. The redshifts of the
host galaxies, measured from narrow emission lines (H II regions)
in the nuclei, are 0.086 and 0.110, respectively.
T. Matheson, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 370-750 nm)
of SN 2002hx (cf. IAUC 8015), obtained by M. Calkins on Nov. 14.53
UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST
spectrograph), shows it to be a type-II supernova. The spectrum
consists of a blue continuum with P-Cyg lines of hydrogen.
Adopting the NASA/IPAC Extragalactic Database recession velocity of
9293 km/s for the host galaxy, the expansion velocity derived from
the minimum of the H-beta line is 8800 km/s.
V838 MONOCEROTIS
T. R. Geballe, Gemini Observatory; and B. Smalley, A. Evans,
and M. T. Rushton, Keele University, report on spectra obtained at
the U.K. Infrared Telescope (+ CGS4) on Oct. 29.125 UT, at
resolutions of 0.0015 and 0.0030 micron over ranges 0.80-1.34 and
1.45-2.52 microns, respectively: "Extraordinary changes have
occurred since our last reported measurements (IAUC 7796). The
spectrum is now that of an extremely cool supergiant, with very
deep water bands (reminiscent of those seen in T-type brown
dwarfs) and remarkably strong CO first-overtone bands. There are
additional strong molecular bands present at 0.85, 0.89, 0.97, 1.05,
1.23, 1.25, 1.65, and 1.69 microns. Further observations are urged."
(C) Copyright 2002 CBAT
2002 November 15 (8016) Daniel W. E. Green
Read IAUC 8017
.dvi or
.ps format.
Our Web policy. Index to the CBAT/MPC/ICQ pages.
