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IAUC 8338: (22); 2004bn, 2004bo

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                                                  Circular No. 8338
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     J. Berthier, P. Descamps, and D. Hestroffer, Institut de
Mecanique Celeste et de Calcul des Ephemerides, Observatoire de
Paris (OP); J. Lecacheux, Laboratoire d'Etudes Spatiales et
d'Instrumentation en Astrophysique, OP; and F. Marchis, University
of California at Berkeley, report on the probable ground track of
two stellar occultations of Hipparcos/Tycho stars by Linus, the
satellite of (22) Kalliope (cf. IAUC 7703, 8177).  On May 14.5083
and June 5.8812 UTC, the stars TYC 6816-00087 (R.A. = 17h17m.0,
Decl. = -25o08', equinox 2000.0) and 6814-00458 (R.A. = 16h57m.3,
Decl. = -26o04') will be occulted for 15.4 s by (22) Kalliope with
drops of 0.7 and 0.9 magnitude, respectively (Goffin 2003,
ftp://ftp.ster.kuleuven.ac.be/dist/vvs/asteroids; Preston 2004,
http://www.asteroidoccultation.com/).  According to the orbit of
Linus, as computed by Marchis et al. (2003, Icarus 165, 112) and
improved with observations gathered during the past three years
with several adaptive-optics systems (Lick 3-m, Palomar 5-m, VLT
8-m, and Keck 10-m telescopes), in addition to observations
published by Margot and Brown (2003, Science 300, 1939), the two
stellar occultations will occur when Linus is located, relative to
the primary, at Delta(R.A.) = -0".14 and Delta(Decl.) = +0".53 on
May 14.5083, and at Delta(R.A.) = -0".47 and Delta(Decl.) = -0".24
on June 5.8812.  The occultations will be visible along a 40-km-
wide shadow located, respectively, about 8 degrees north and about
5 degrees south of the primary occultation track, respectively,
which itself crosses southern Australia and the south Pacific on
May 14 and the northern Mediterranean Sea countries and Russia on
June 5.  The occultations by Linus are expected to last < 3.2 s.
Shadow path, details, and updates can be obtained at website URL

SUPERNOVAE 2004bn AND 2004bo
     T. Matheson, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 340-720 nm)
of SN 2004bn (cf. IAUC 8335), obtained by P. Berlind on May 11.18
UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST
spectrograph), shows it to be a type-II supernova; adopting the
NASA/IPAC Extragalactic Database recession velocity of 6533 km/s
for the host galaxy, the expansion velocity, derived from the
minimum of the H_beta line, is 5400 km/s.  A spectrum of SN 2004bo
(ibid.), obtained by Berlind on May 11.23, shows it to be a type-Ia
supernova a few weeks past maximum.

                      (C) Copyright 2004 CBAT
2004 May 11                    (8338)            Daniel W. E. Green

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