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Q: Planets of Other Stars ( Answered 5 out of 5 stars,   1 Comment )
Subject: Planets of Other Stars
Category: Science > Astronomy
Asked by: mongolia-ga
List Price: $10.00
Posted: 08 Oct 2006 10:14 PDT
Expires: 07 Nov 2006 09:14 PST
Question ID: 771729
Of the planets of other stars so far discovered What is

-  The lightest Planet so far discovered?
-  the Planet furtherest from its parent star?

Yours Truly

Subject: Re: Planets of Other Stars
Answered By: bobbie7-ga on 08 Oct 2006 12:17 PDT
Rated:5 out of 5 stars
Hello Mongolia,

The lightest Planet so far discovered

HAT-P-1b appears to be the lightest planet.

?Using a network of small automated telescopes known as HAT,
Smithsonian astronomers discovered a planet, since designated
HAT-P-1b, that orbits one member of a pair of distant stars 450
light-years away in the constellation Lacerta. The planet has a radius
1.38 times that of Jupiter, but one-half the density, making it the
least dense planet on record.?

?With a radius about 1.38 times Jupiter's, HAT-P-1 is the largest
known planet. In spite of its huge size, its mass is only half that of
"This planet is about one-quarter the density of water," Bakos said.
"In other words, it's lighter than a giant ball of cork! Just like
Saturn, it would float in a bathtub if you could find a tub big enough
to hold it, but it would float almost three times higher."

The Planet farthest from its parent star

OGLE-2005-BLG-390Lb appears to be the farthest planet from its parent star- 
?OGLE-2005-BLG-390Lb orbits around its star at an average distance of
2.0 to 4.1 AU, or an orbit that would fall between the orbits of Mars
and Jupiter in Earth's own solar system. ? Until this discovery, no
small exoplanet had been found farther than 0.15 AUs from a main
sequence star. The planet takes approximately 10 Earth years to orbit
its star, OGLE-2005-BLG-390L.?


?This planet is estimated to have a relatively wide separation of 2.6
AU from its parent star.


Search terms:

farthest planet parent star
Lightest planet
extrasolar planet

I hope the information provided is helpful!

Best regards,

Clarification of Answer by bobbie7-ga on 09 Oct 2006 06:16 PDT
2006, OGLE-2005-BLG-390Lb appears to also be the lightest planet.

On January 25 the discovery of OGLE-2005-BLG-390Lb was announced. This
is the most distant and probably the coldest exoplanet yet found. It
is believed to orbit a red dwarf star around 21,500 light years away,
towards the centre of our galaxy. It was discovered using
gravitational microlensing and is estimated to have a mass of 5.5
times that of Earth, making it the least massive known exoplanet to
orbit an ordinary main-sequence star.
mongolia-ga rated this answer:5 out of 5 stars
Thanks Bobbie

Subject: Re: Planets of Other Stars
From: iang-ga on 09 Oct 2006 05:33 PDT
HAT-P-1b has a low density, but at half Jupiter's mass it's still
almost 160 times more massive than the Earth.  This one's only 5.5
times as massive

Ian G.

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