Central Bureau for Astronomical Telegrams
IAUC 8636: S/2005 (2003 EL_61) 2; N LMC 2005; 2005ky
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Circular No. 8636
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)
S/2005 (2003 EL_61) 2
M. E. Brown, California Institute of Technology, on behalf of
the adaptive-optics team at Keck Observatory, reports the discovery
of a second satellite of the transneptunian object 2003 EL_61 from
K'-band images taken with the Laser Guide Star Adaptive Optics
system at the Keck II telescope on Mar. 1, May 27, and June 29.
The satellite is 4.6 +/- 0.5 mag fainter than the primary. A
preliminary circular orbit suggests a 34.1-day period with a
semimajor axis of 39300 km, inclined by 40 deg from the larger
outer satellite, S/2005 (2003 EL_61) 1 (cf. IAUC 8577), though
additional observations are required to confirm the orbit.
Additional information can be found at website
http://www.gps.caltech.edu/~mbrown/2003EL61
NOVA IN THE LARGE MAGELLANIC CLOUD 2005
E. O. Waagen, AAVSO, reports that B. Allen's position (cf.
IAUC 8635) was only an estimation, adding that a precise position
was measured by P. Nelson (Ellinbank, Victoria, Australia) from a
CCD image taken on Nov. 27.583 UT: R.A. = 5h10m32s.68, Decl. =
-69o12'35".7 (equinox 2000.0).
SUPERNOVA 2005ky
D. A. Howell, University of Toronto, on behalf of the
Supernova Legacy Survey (http://xxx.lanl.gov/abs/astro-ph/?0510447),
reports the discovery of a supernova at magnitude i'(AB) = 22.3 on
Nov. 24.3 UT on Megacam images obtained with the Canada-France-
Hawaii Telescope. SN 2005ky, which had brightened to i'(AB) = 21.0
by Dec. 1.3, is located at R.A. = 2h24m36s.254, Decl. =
-4o10'54".94 (equinox 2000.0), which is 0".33 west and 3".40 south
of the center of its host galaxy. A spectrogram of 2005ky,
obtained by M. Sullivan and R. S. Ellis on Nov. 30.3 with the Keck
I telescope (+ LRIS), indicates that this is a type-Ia supernova
about one week before maximum light. A redshift of z = 0.148 was
determined from host-galaxy Ca H and K absorption. The supernova
shows a blue wing on the Si II 635.5-nm feature that is a possible
indication of high-velocity features. The expansion velocities are
relatively high for this epoch: 15000 km/s determined from Si II
635.5-nm and 27000 km/s determined from Ca II H and K and the Ca II
infrared triplet. There is no apparent feature at 580 nm, and the
blue part of the S II 'W' at 540 nm is enhanced relative to the red
absorption. Strong Na D from the host galaxy indicates that there
may be extinction along the line-of-sight to this supernova.
(C) Copyright 2005 CBAT
2005 December 1 (8636) Daniel W. E. Green
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