OGLE-2005-BLG-390L is a star thought to be a spectral type M - red dwarf star (95% probability, 4% probability it is a white dwarf, <1% probability it is a neutron star or black hole), and massing 0.22 ± 0.1 times the mass of the Sun. The star is located at coordinates RA=17:54:19.2, Dec=-30:22:38 (J2000), at a distance of 21,500 ± 3300 light years (6.6 ± 1.0 kpc).

OGLE-2005-BLG-390L has one known planet, which was discovered during an OGLE (Optical Gravitational Lensing Experiment) survey. Indications are the planet is about five times Earth mass, orbiting at about 2.5 astronomical units from the parent star. The discovery was announced on January 25, 2006.

OGLE-2005-BLG-390Lb

OGLE-2005-BLG-390Lb is currently the smallest known extrasolar planet around a main sequence star, possibly rocky, with a mass around 5.5 times that of the Earth. The orbital radius (assuming a circular orbit) of the planet is 2.6 AU, however the orbital elements are unknown. Based on its low mass and estimated temperature of around 50 K, the planet is thought to consist mainly of ices, like Pluto or Uranus, rather than being a Jupiter-like gas giant.

External links

• Space.com
• Extrasolar Planets Encyclopaedia

Scorpius constellation | Red dwarfs | Type-M stars

OGLE-2005-BLG-390L | OGLE-2005-BLG-390L | OGLE-2005-BLG-390L | OGLE-2005-BLG-390L | OGLE-2005-BLG-390L