 OGLE-2005-BLG-390L's location in the night sky. | |
| Observation data EpochJ2000.0 EquinoxJ2000.0 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 17h 54m 19.2s[1] |
| Declination | −30° 22′ 38″[1] |
| Characteristics | |
| Spectral type | M4[1] |
| Astrometry | |
| Distance | 21,500 ±3300 ly (6,600 ±1,000 pc) |
| Details | |
| Mass | 0.22 M☉ |
| Other designations | |
| EWS 2005-BUL-390, EWS 2005-BLG-390[1] | |
| Database references | |
| SIMBAD | data |
OGLE-2005-BLG-390L is a star thought to be aspectral type M (ared dwarf; 95% probability, 4% probability it is awhite dwarf, <1% probability it is aneutron star orblack hole). Thisgalactic bulgestar is located in theScorpiusconstellation at a far distance of about 21,500light years,[1] near the border withSagittarius.
OGLE-2005-BLG-390L has one known planet, which was discovered using the technique ofgravitational microlensing. Indications are that the planet is about five timesEarth mass, orbiting at about 2.6astronomical units from the parent star. The discovery was announced on January 25, 2006.[2]OGLE-2005-BLG-390Lb was once considered one of the smallest known extrasolar planets around amain sequence star, possibly rocky, with amass around 5.5 times that of the Earth. The orbitalradius (assuming a circular orbit) of the planet is 2.6AU, however the orbital elements are unknown. Based on its low mass and estimated temperature of around 50K, the planet is thought to consist mainly of ices, likePluto orUranus, rather than being aJupiter-likegas giant.[2]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 5.5 M🜨 | 2.6 | ~3500 | — | — | — |
