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IAUC 8523: NEW Sats OF SATURN; 2005by; V5115 Sgr

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IAUC number 

                                                  Circular No. 8523
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)


NEW SATELLITES OF SATURN
     Twelve new satellites of Saturn (S/2004 S 7-S/2004 S 18) have
been reported by D. Jewitt, S. Sheppard, and J. Kleyna in data
obtained during 2004 Dec.-2005 Mar. with the Subaru and Gemini 8-m
telescopes and the Keck 10-m telescope, aided by B. G. Marsden's
ongoing linkages and search ephemerides.  The astrometry and
orbital data appear on MPEC 2005-J13, showing retrograde orbits for
11 of the satellites; orbital periods range from 820 to 1354 days.
Diameters estimated from the apparent red magnitudes (assuming
4-percent geometric albedo) range from 3 to 7 km.


SUPERNOVA 2005by IN UGC 8701
     Further to IAUC 8519, S. Park and W. Li report the LOSS
discovery of an apparent supernova on unfiltered KAIT images taken
on May 2.38 (at mag 18.8) and 3.38 UT (mag 18.4).  SN 2005by is
located at R.A. = 13h45m46s.91, Decl. = +22o05'46".8 (equinox
2000.0), which is 18".4 east and 27".2 north of the center of UGC
8701.  Nothing was visible at this position on KAIT images taken on
2004 May 12.35 (limiting mag 20.0) or 2005 Apr. 20.40 (limiting mag
19.0).
     M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrogram (range 340-730
nm) of SN 2005by, obtained by T. Groner on May 4.31 UT with the F.
L. Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a
type-II supernova.  The spectrum consists of a flat continuum and
P-Cyg lines of H_alpha and H_beta.  Adopting the NED recession
velocity of 8202 km/s for the host galaxy (from Falco et al. 1999,
PASP 111, 438), the expansion velocity derived from the minimum of
the H_beta line is about 13000 km/s.


V5115 SAGITTARII
     R. J. Rudy, R. W. Russell, and D. K. Lynch, Aerospace
Corporation, report on 0.8-5.0-micron spectroscopy of this nova
(cf. IAUC 8500, 8501) obtained on Apr. 17 with the Infrared
Telescope Facility (+ SpeX).  In addition to the emission features
of hydrogen, V5115 Sgr showed the strong, fluorescently excited
lines of O I that are typical of a nova shortly after outburst,
along with many lines of N I, but no prominent features from C I.
Widths (FWHM) for the stronger emission were 3000 km/s.  Fe II
emission was present but there was no evidence of the CO bands at
2.3 and 4.6 microns or thermal emission from dust.  The reddening
derived from the O I lines was E(B-V) = 0.53.

                      (C) Copyright 2005 CBAT
2005 May 4                     (8523)            Daniel W. E. Green

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