[IAUC] CBET 733: 20061110 : (22) KALLIOPE AND (22) KALLIOPE I

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                                                  Electronic Telegram No. 733
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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(22) KALLIOPE AND (22) KALLIOPE I
[Editorial note:  the following paragraph is given below in revised
form, to replace the item on CBET 732]
     M. Soma, National Astronomical Observatory of Japan, Mitaka,
Tokyo; and T. Hayamizu, Sendai Space Hall, Satsuma-sendai, Kagoshima,
Japan, report that the occultations by minor planet (22) Kalliope and
its satellite Linus (cf. IAUCs 7703, 8177, 8338) of the Tycho-catalogue
star 1886-01206-1 (R.A. = 6h17m54s.067, Decl. = +27d11'49".12, equinox
2000.0; V = 9.1; spectral type A5) = SAO 78190 = BD +27o1049 were
observed in Japan at around 2006 Nov. 7.826 UT.  Positive observations
of the occultations by each object have been reported thus far by eight
observers, and the observations are consistent with each other.  The
angular distance of Linus from Kalliope was 0".26 in p.a. 313 degrees
at the time of the occultation.  The occultation by Linus was predicted
by J. Berthier, IMCCE, whose prediction was forwarded by J. Lecacheux
some 19 hours before the event, and it turned out that the prediction
was accurate to within about 100 km.  The derived size for Kalliope is
190 x 125 km (with the major axis in p.a. 0 deg), and that for Linus is
30 km.  This is the first successful observation of an occultation by a
satellite of a minor planet that was discovered previously by other
means.  A diagram of the observations is at URL
http://uchukan.satsumasendai.jp/data/occult/0611Kalliope-red-E.gif.

     Also, D. Dunham has forwarded a message from D. Herald (Canberra,
Australia), who has computed Linus' separation from Kalliope as 0".247
+/- 0".005 in p.a. 314.5 +/- 0.5 deg from the Japanese occultation
observations.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2006 CBAT
2006 November 10                 (CBET 733)               Daniel W. E. Green