Subject: Re: Размеры Варуна и KBO (TNO)
Date   : 30 May 2001 19:25 GMT
From   : Денис Маймистов [DenisM] (AstroSchool@mail.convey.ru)
To     : All

Еще раз : статья авторов-замерителей :) (см. ниже), ссылка на которую 
я давал ранее, упоминает :
" Varuna has equivalent circular diameter D = 900(+125/-145) km 
and red geometric albedo p = 0.070(+0.030/-0.017)"

Диаметр - 900(+125/-145) км
Альбедо (геометрическое) - 0.070(+0.030/-0.017)

Денис Маймистов.


SIZE AND ALBEDO OF KUIPER BELT OBJECT (20000) VARUNA 

David Jewitt and Herve Aussel 
Institute for Astronomy, University of Hawaii 
and Aaron Evans 
Dept. Physics and Astronomy, State University of New York at Stony Brook 

NATURE, 2001, 411, 446-447 (May 24 issue) 

Abstract
Observations within the last decade have revealed the existence of a large
number of bodies in orbit about the sun beyond Neptune. These bodies, commonly
known as Kuiper Belt Objects (KBOs), are products of agglomeration in the
rarefied outer regions of the protoplanetary disk of the sun. Scientific
interest focuses on the primitive nature of the KBOs and on their role as the
likely source of short-period comets. Unfortunately, the KBOs are difficult
astronomical targets, so that even such basic physical properties as the sizes
and albedos remain unknown. Here we report the first simultaneous thermal and
optical measurements of a bright KBO and use them to solve separately for the
albedo and size. (20000) Varuna has equivalent circular diameter D =
900(+125/-145) km and red geometric albedo p = 0.070(+0.030/-0.017). The surface
is darker than Pluto, suggesting a composition largely devoid of fresh ice, but
higher than the canonical albedo of 0.04 previously assumed for these bodies