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IAUC 7807: (26308) 1998 SM_165; 1999 TC_36; C/1996 Y2

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                                                  Circular No. 7807
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)

(26308) 1998 SM_165
     M. E. Brown and C. A. Trujillo, California Institute of
Technology, report the discovery of a companion to the
transneptunian object (26308):  "Observations were collected on two
dates, spanning about 45 min and centered at 2001 Dec. 22.536 and
28.411 UT, as part of an ongoing survey for transneptunian binaries
undertaken with the Hubble Space Telescope STIS instrument.
Separations of 0".2056 +/- 0".0009 in p.a. 299.5 +/- 0.2 deg and
0".2334 +/- 0".0012 in p.a. 267.2 +/- 0.3 deg were measured for the
two dates, respectively.  At a mean geocentric distance of 34.9 AU,
this separation corresponds to at least 6000 km between components.
The pair exhibit a mean flux difference of about 1.9 magnitudes in
the unfiltered images.  The flux has only been roughly estimated
because the lightcurve of the primary (Romanishin et al. 2001, Bull.
AAS 33, 1031) was evident but incomplete in the discovery data."

1999 TC_36
     F. Marchis, University of California, Berkeley (UCB); and J.
Berthier, Institut de Mecanique Celeste, Centre National de la
Recherche Scientifique, report for their collaboration (H.
Boenhardt, O. Hainaut, A. Delsanti, European Southern Observatory;
I. de Pater, UCB; C. Dumas, Jet Propulsion Laboratory; D. Gavel,
Lawrence Livermore National Laboratory) the detection of the
companion of the plutino 1999 TC_36 (cf. IAUC 7787) using the
Adaptive Optics on the Lick Shane 3-m telescope:  "After careful
analysis, observations taken on 2001 Oct. 4.315 during an appulse
event with a Tycho-2 star (cf. http://astron.berkeley.edu/~fmarchis
/Science/TNOs_Appulse/), we detect, on K-band images with 0".22
angular resolution, the companion at a separation of 0".246 +/-
0".017 at p.a. 322 +/- 1 deg.  The difference of magnitude is
estimated to be 1.89 +/- 0.14.  We encourage other groups to
observe the next appulse events on 2002 Jan. 30, Feb. 2 and Oct.
10.  Astrometric measurement is also needed, since 1999 TC_36 was
about 10" from its expected position."

COMET C/1996 Y2 (SOHO)
     MPEC 2002-B01 contains astrometry and orbital elements for a
comet visible in C2 and C3 and found by X. Leprette on SOHO website

     1996 UT           R.A. (2000) Decl.
     Dec. 29.990      18 49.1      -25 33

                      (C) Copyright 2002 CBAT
2002 January 24                (7807)            Daniel W. E. Green

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