Central Bureau for Astronomical Telegrams

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IAUC 8163: (5381); 2003gl; 2003gd

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IAUC number 

                                                  Circular No. 8163
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)
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(5381) SEKHMET
     M. C. Nolan and E. S. Howell, National Astronomy and
Ionosphere Center; A. S. Rivkin, Massachusetts Institute of
Technology; and C. D. Neish, University of British Columbia, write:
"Arecibo radar delay-Doppler images (2380 MHz, 12.6 cm) obtained on
May 8-11 show that minor-planet (5381) is a binary system.
Preliminary estimates of average diameters, based on range extents
at 45-m resolution, are 1000 m and 300 m.  The orbital period
appears to be near 12 hr, with 24 hr much less probable.  The
minimum orbital radius is 1.3 km, with 1.5 km as our best estimate.
Visible spectroscopy obtained on May 21 at the Kitt Peak 4-m
telescope show an absorption band near 1 micron, suggesting a stony
composition.  Optical lightcurve observations of this object would
be extremely valuable."


SUPERNOVA 2003gl IN NGC 7782
     Further to IAUC 8162, M. Schwartz and P. Holvorcem report the
discovery via LOTOSS of an apparent supernova on unfiltered Tenagra
II images taken on July 5.4 (mag about 18.3) and 6.4 UT (mag about
18.2).  SN 2003gl is located at R.A. = 23h53m53s.99, Decl. =
+7 57'23".7 (equinox 2000.0), which is 1".9 east and 51".2 south of
the nucleus of NGC 7782.  A Tenagra II image taken on 2002 Nov.
23.3 showed nothing at this position (limiting mag about 19.5).


SUPERNOVA 2003gd IN M74
     P. Garnavich, University of Notre Dame; and E. Bass, Cornell
University, report that the position of SN 2003gd was included on
R-band images taken with the Wisconsin-Indiana-Yale-NOAO telescope
(WIYN + MiniMosaic Camera) on 2003 Jan. 29.1 UT, while observing
SN 2002ap (total exposure time 900 s; 1".0 seeing).  Using the
accurate astrometry of McNaught (IAUC 8152) and comparing with the
Hubble Space Telescope archival images (Smartt et al., IAUC 8152),
the WIYN images place a limit of R > 24 on the progenitor
brightness at four months before discovery.  This observation,
combined with spectral-age estimates by Kotak et al. and Phillips,
constrains the likely date of explosion to between February and
April.

                      (C) Copyright 2003 CBAT
2003 July 6                    (8163)            Daniel W. E. Green

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