Central Bureau for Astronomical Telegrams
IAUC 7968: 2002eq, 2002ez,, 2002fa; RADIO TRANSIENT IN Sco; P/2002 Q1
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Circular No. 7968
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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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)
SUPERNOVAE 2002eq, 2002ez, AND 2002fa
M. Hamuy, Carnegie Observatories, reports that a spectrum
(range 380-730 nm) of SN 2002eq (cf. IAUC 7959), obtained on Sept.
12.17 UT with the Las Campanas Dupont 2.5-m telescope (+ Modular
Spectrograph), shows it to be a type-Ia supernova. The spectrum
bears strong resemblance to SN 1994D at 20 days past maximum; a
redshift of approximately 0.088 is derived by comparison to SN
1994D. A spectrum of SN 2002ez (cf. IAUC 7967), obtained on Sept.
12.27, bears resemblance to the type-Ia SN 1994D at 18 days past
maximum; a redshift of approximately 0.043 is derived by comparison
to SN 1994D. A spectrum of SN 2002fa (cf. IAUC 7967), obtained on
Sept. 12.08, shows it to be of type II with a broad H_alpha line
exhibiting a P-Cyg profile. The minimum of the absorption
component yields an expansion velocity of 8100 km/s. A spectrum of
the nucleus of the host galaxy yields a redshift of 0.060.
RADIO TRANSIENT IN SCORPIUS
M. P. Rupen, V. Dhawan, and A. J. Mioduszewski, National Radio
Astronomy Observatory, report that observations with the Very Large
Array (VLA) on Sept. 9 revealed a new about 3-mJy source at 8.46
GHz at a nominal position R.A. = 16h28m47s.3, Decl. = -41o52'35"
(equinox 2000.0). Although the detection is highly significant
(11-sigma), the low declination, poor weather, and recent
re-positioning of several of the VLA's constituent antennas combine
to make the flux density uncertain to perhaps 50 percent and the
position accurate to only a few arcsec. The beam size was 3".6 x
0".9 FWHM at a position angle of -7 deg. VLA observations of the
same field over the past year, primarily at 8.46 GHz, have given
numerous nondetections, to rms noise limits of 0.1-0.3 mJy/beam.
Based on the rarity of strong, variable radio sources at this
frequency, and the close (3".4) positional agreement, Rupen et al.
suggest this is a radio counterpart to GSC 7861.1088 = 1RXS
J162848.1-415241, proposed by Tsarevsky et al. (cf. http://vsnet.
kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-campaign/msg01058.html) as
a probable microquasar. Further radio, optical, infrared, and
x-ray observations are urgently requested.
COMET P/2002 Q1 (VAN NESS)
This comet is of short period, as shown by the orbital
elements on MPEC 2002-R52 [T = 2002 July 15.99 TT, q = 1.5214 AU,
e = 0.5695, Peri. = 184.76 deg, Node = 174.11 deg, i = 36.37 deg
(equinox 2000.0), P = 6.64 yr].
(C) Copyright 2002 CBAT
2002 September 12 (7968) Daniel W. E. Green
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