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THE ASTRONOMER Electronic Circular No 2084      2005 Feb 10 17.50UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK             GMH at AST.STAR.RL.AC.UK
WORLD WIDE WEB                         http://www.theastronomer.org
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OCCULTATION OF TYC 1395-01016-1 BY 2000 CF105
Further to the announcement on TA E-Circular 2083 relating to a possible 
occultation of TYC 1395-01016-1 by 2000 CF105 (A Kuiper Belt Object) 
Francois Colas reports that images with the 1-m telescope at Pic du Midi 
of the asteroid enabled an astrometric reduction by Raoul Berhend and 
Eric Frappa.

The result is that now the error is smaller but equal to earth's
diameter, the 1 meter telescope is too small to give good astrometry 
with this kind of object. The shadow is at about 3 Earth diameter. The 
asteroid has two components so the probability of an occultation by one 
of the two components is not zero.

The most important consideration now is for observers to note that the 
occultations will occur 30 minutes later.

The latest prediction is for tomorrow morning, 2005 February 11 at 00h 
47mUT. The star is of mag 11.7 (position as in E2083). The maximum 
duration is 5.6 seconds with a magnitude drop of 11 mags. The asteroid 
is of magnitude 22.7, diameter 138km.

It would be wise to commence observations much earlier than the 
predicted time as several uncertainties exist.

Guy M Hurst