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Location: UFOUpDatesList.Com > 2007 > Apr > Apr 27

Re: New Planet Could Harbour Water And Life? -

From: John Scheldroup <jschel.nul>
Date: Thu, 26 Apr 2007 17:18:15 -0500
Fwd Date: Fri, 27 Apr 2007 10:11:24 -0400
Subject: Re: New Planet Could Harbour Water And Life? -

>From: Greg Boone <Evolbaby.nul>
>To: ufoupdates.nul
>Date: Wed, 25 Apr 2007 09:44:31 EDT
>Subject: Re: New Planet Could Harbour Water And Life?

>>From: Nick Balaskas <Nikolaos.nul>
>>To: UFO UpDates - Toronto <ufoupdates.nul>
>>Date: Tue, 24 Apr 2007 18:23:52 -0400 (Eastern Daylight Time)
>>Subject: New Planet Could Harbour Water And Life?

>>Hi Everyone!

>>Below is a major announcement - the discovery of the first
>>Earth-size planet orbiting within the "habitable zone" of
>>another star, Gliese 581.


>Why is it astronomers can find planets around stars 20 or 100
>light years away but still for some unexplained reason can't
>tell us what's going on around our nearest neighbor the Alpha
>Centauri star system. It's only 4 light years away and has 3
>stars in it.


I'm sure someone can explain this a little clearer but the
answer is Luminosity. Set aside those all important wobbles, but
how easy would it be for you and your telescope to see a planet
in front of bright star Alpha Centauri A then would it be let
say Gliese 581 ?


Alpha Centauri A

It has about 1.09 to 1.10 times Sol's mass and 1.23 its diameter
(ESO; and Demarque et al, 1986), is about 52 to 60 percent
brighter than Sol.

Alpha Centauri B

This much dimmer companion star is a main sequence, reddish-
 orange dwarf (K0-1 V). It appears to have only 90.7 percent of
Sol's mass, about 86.5 percent of its diameter, and 45 to 52
percent of its luminosity (ESO; and Johnson and Wright, 1983,
page 681). Viewed from a planet at Earth's orbital distance
around Alpha Centauri A, this companion B star would provide
more light than the full Moon does on Earth as its brightest
night sky object,


Gliese 581 / HO Librae

Gliese 581 is a cool and dim, main sequence red dwarf (M2.5 V).
The star has almost a third (31 +/- 2 percent) of Sol's mass,
possibly 38 percent of its diameter (Pasinetti-Fracassini et al,
2001; and Johnson and Wright, 1983), and a bit more than
one percent (around 0.013) of its bolometric luminosity
(Bonfils et al, 2005, in pdf).


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