SETI again

its possible or its also possible that im misremembering the exact
nature of that part of the article. perhaps it was somewhat closer
than the oort cloud.

--- In spacesettlers@yahoogroups.com, "Lucio de Souza Coelho"
wrote:
>
> On 7/28/06, Robert wrote:
> (...)
> > depends on how reflective it is. i believe it was only one pixil
in
> > size.
>
> Sedna's albedo is 0.25 . It has an estimated diameter of 1700 Km
> (larger than Texas, for sake of comparisons). It appears as
something
> 4 pixels wide in the pictures. An object of corresponding
reflexivity
> one pixel wide would still be 435 Km wide. In order to a
> locomotive-sized object (say 10 meters wide) to be as bright as an
> object 435 Km wide with an albedo of 0.25 , it would need an albedo
of
> 7,3x10^9 .
>
> Unfortunately albedo beyond 1 are physically impossible, for that
> would mean a miraculous object that reflects more light than it
> absorbs. In the case of the huge albedo found above,
your "locomotive"
> would put the brightest quasars in the Universe to shame.
>
> > some how they came up with the determination of "likely to be as
> > small as a locomotive"
> (...)
>
> As you can see from the simple calculation above, somehow they made
an