Gliese 710

Gliese 710 ( other names: GJ 710, Gl 710, BD -01 3474, HD 168442, HIP 89825, U449, Vys / McC 63, 1063 NSV ) is a star in the constellation of the Serpent. It has an apparent magnitude of 9.69 mag and belongs to the spectral class K7 Vk on. Its mass is about 60 % of the sun's mass and its distance about 63.8 light-years ( 19.6 parsecs ).

On the approach of the star of the Astro statistician Wilhelm Gliese pointed out. His proper motion and radial velocity according to how they are measured by the Hipparcos satellite and listed in the Hipparcos catalog, Gliese 710 is passing by in about 1.4 million years ago, very close to the Sun; You may be closer than a light-year distance. He is in a time interval of ± 10 million years the star, whose combination will disrupt our solar system most of the mass and proximity. The sun is currently closest star is Proxima Centauri at a distance of 4.2 light years ( 1.3 pc). The last strong perturbation of our system was the three- star system Algol, the vorbeizog at a distance of 9.8 light years ago, 7.3 million years. Despite its relatively long distance of Algol was interference effect due to its large mass ( together 5.8 solar masses ) and its slow speed encounter relatively strong.

Calculation of the next meeting

Gliese 710 has the potential to disrupt the supposed Oort cloud strong enough that a rain of comets entering the inner solar system. In this case the risk of the earth to be hit by a comet increases. After dynamic model calculations by García - Sánchez et al. of 1999, however, will not exceed 5% of the net increase in cratering. They estimated the closest approximation in 1,360,000 years, with a distance of 0.337 ± 0.177 parsecs ( 1.1 light years ).

The calculations of Bobylev in 2010, according to Gliese 710 has a chance of 86 %, the Oort cloud to penetrate, assuming that this is in the shape and size of a spheroid around the sun with semiaxes of 80,000 and 100,000 astronomical units. The exact distance of closest approach is difficult to predict because it depends sensitively on the current position and moving speed of the star. Bobylev she estimated with 0.311 ± 0.167 parsecs (1.01 ± 0.54 light years ). He also estimated a probability of 1:10,000 that the star enters the region where d < 1000 AU, where it would interfere with the Kuiper belt objects significantly.