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.
farthest planet parent star
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