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| Science Forum Index » Astro Forum » Gliese 710 red dwarf will enter solar system in 1.4... |
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| Yousuf Khan... |
 Posted: Tue Jun 30, 2009 11:39 am |
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According to a magazine, found out that they mapped the motions of
several nearby stars, and found out that they expect one star Gliese 710
to come to within 1.1 lightyears of our solar system. That would put it
in the middle of one side of our Oort cloud, with a radius of 2
lightyears. The entrance of this star is likely to produce disturbances
in the Oort cloud, possibly resulting in the entrance of cometary bodies
in the inner solar system.
Gliese 710 is thought to be a not too insubstantial red dwarf nearly
half a solar mass (0.42 M). So it's likely to perturb quite a lot of
objects in the Oort cloud. It may have its own Oort cloud that will also
get mixed up in all of this.
So it looks like the next astronomical crisis we'll be facing is not the
Sun heating up and boiling the seas away in 1 billion years, but this
Gliese 710 event.
"It is about 63.0 light years from Earth, but is notable because its
proper motion, distance, and radial velocity[1] indicate that it will
approach within 1.1 light years (70,000 AU) from Earth within 1.4
million years, based on the latest Hipparcos data. At closest approach
it will be a first-magnitude star about as bright as Antares. As one can
reference from the data on the right, the proper motion of this star is
very small for its distance, meaning it is traveling nearly directly in
our line of sight; compare for example with Arcturus."
http://en.wikipedia.org/wiki/Gliese_710
Yousuf Khan |
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