Electronic Telegram No. 776 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 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 (22) KALLIOPE I (LINUS) J. Berthier, Institut de Mecanique Celeste et de Calcul des Ephemerides (IMCCE), Paris Observatory; F. Marchis, University of California at Berkeley (UCB); and P. Descamps, D. Hestroffer, F. Vachier, and F. Colas, IMCCE, report that they have refined the orbital elements of the satellite of (22) Kalliope (cf. IAUC 7703, 8177, 8338), based on the successful observation of the Nov. 7 stellar occultation reported by Soma et al. (CBET 732) and on an observation taken with W. M. Keck-II adaptive Optics System by C. Laver, M. Adamkovics, and I. de Pater (UCB) on Dec. 12.5701 UT, when the moonlet was located 0".868 from the primary in p.a. 174.1 degrees. According to the improved orbit, the two forthcoming stellar occultations on 2007 Jan. 2 and 8 will occur when the satellite is located, relative to the primary, at Delta(R.A.) = +0".40 and Delta(Decl.) = -0".33 on Jan. 2.67292, and at Delta(R.A.) = +0".02 and Delta(Decl.) = +0".86 on Jan. 8.86074. The occultations are expected to last < 4 s along an approximately 40-km-wide shadow. Shadow path, details, and updates can be obtained at the following website URL: http://www.imcce.fr/page.php?nav=en/ephemerides/phenomenes/ occult/stellarocc.php?query=predoc The observations of these stellar-occultation events are encouraged, in order to improve the measurement of Linus' radius as previously obtained during the Nov. 7 event and to refine the predictions of mutual eclipses that will occur in February and March 2007 (Descamps et al., Proceedings 2006 Paris MEOTUS Workshop, Planetary and Space Science, in press). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2006 CBAT 2006 December 20 (CBET 776) Daniel W. E. Green