HD 69830

HD 69830 is a yellow- orange star in the constellation aft deck of the ship ( Puppis ), to which both an asteroid belt and three exoplanets were detected. The star has no proper name, so its catalog number is used in the Henry Draper Catalogue as a label. HD 69830 is one of the sun nearby stars and still be seen under favorable conditions just with the naked eye. Bulk, brightness, and surface temperature is somewhat lower than that of the sun. He is about 41 light-years away from Earth.

Companion

The asteroid belt was observed with infrared images from the Spitzer Space Telescope NASA. He is about 25 times as massive as the asteroid belt between Mars and Jupiter.

The planetary system of HD 69830 is unusual because jupiter large gas giants do not exist or were at least not yet discovered. The three known exoplanet HD 69830 b, HD 69830 and HD 69830 c d lie in mass between the Earth and the planet Neptune or just above it. They orbit the star at distances of 0.08 and 0.19 and 0.63 AU with orbital periods of 8.7 and 31.6, and 197 days. Apart from the orbital period and the mass of data is not known, the surface temperatures can be extrapolated, however. The two inner planets, it could be representatives of the so-called super-Earths - in other words a terrestrial planet with a solid surface and a multiple of Earth's mass. Their surfaces would heat up because of the small distance to the central star to several hundred degrees. The third planet is probably more of a Neptune -like gaseous planet. If he would also be built Earthlike, could theoretically exist on him water in liquid form. The three planets of HD 69830 were detected by the HARPS spectrograph of the 3.6 - meter telescope at the La Silla Observatory of the European Southern Observatory ( ESO).