HD 210277

HD 210277 is a star of brightness 7 like in the constellation Aquarius. The yellow dwarf star of spectral type G0V similar in size, luminosity and diameter of our sun. The age of HD 210277 is estimated to be 12 billion years (the sun is less than 5 billion years old ). Due to its distance from the solar system from 69 light years of the star is visible only with telescopes and binoculars. 1998, a companion was discovered spectroscopically, orbiting the star at a distance of 1.138 ± 0.066 AU and bears the systematic name HD 210277 b.

HD 210277 b

HD 210277 b was discovered in 1998 by the California and Carnegie Planet Search Team by determining the radial velocity. The planet discovered has a greater by at least 24% mass than Jupiter and orbits its sun in approximately the same distance as the earth, the sun, but its orbit is significantly eccentric ( ie, the distance of the planets from the sun are unstable ).

Based on data of the astrometric satellite Hipparcos proposed in 2000 a group of scientists to accept the orbital inclination of the planet with 175.8 ° and the actual mass to be estimated with 18 times the mass of Jupiter. Thereby, the companion of HD 210277 would not be a planet but a brown dwarf. This was however not confirmed and the likelihood that the assumptions and statements are true, is the basis of statistical considerations very low.