OGLE-2005-BLG-390L
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Sagittarius |
| Right ascension | 17h 54m 19s |
| Declination | -30° 22' 38" |
| Distance | 21,500 ± 3300 ly (6,600 ± 1,000 pc) |
| Spectral type | M? |
| Other designations | |
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EWS 2005-BLG-390L
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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 using the technique of gravitational microlensing. Indications is that 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.
[edit] Planetary system
OGLE-2005-BLG-390Lb is considered one of the smallest known extrasolar planets 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.
| Planet (in order from star) |
Mass (MJ) |
Orbital period (days) |
Semimajor axis (AU) |
Eccentricity |
|---|---|---|---|---|
| b | 0.018 | ~3500 | 2.6 | ? |
