MOA-2010-BLG-477L
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittiarus |
| Right ascension | 18h 06m 7.44s[1] |
| Declination | −31° 24′ 16.12″[1] |
| Characteristics | |
| Spectral type | KV[1] |
| Variable type | unknown |
| Astrometry | |
| Distance | 7500 ± 2000[2] ly (2300 ± 600[2] pc) |
| Details | |
| Mass | 0.67 +0.33-0.13[2] M☉ |
MOA-2010-BLG-477L is a K-type star with about 0.67 times the mass of the Sun,[1] in the main-sequence phase of its stellar evolution.[1] Overall, very little is known about this star, with very poor constrains on its projected characteristics due to One extrasolar planet, with a mass greater than that of Jupiter, has been discovered orbiting the star at a distance of roughly 2 AU.[2] The planet was detected by means of microlensing,[1] where gravitational lensing as the planet and its host star pass in front of a background star causes a temporary flare in the amount of light observed, allowing the planet's existence to be known.[1]
Planetary system
The history of the detection of the planet, MOA-2010-BLG-477 L b, dates back to the year 2010. In that year, a microlensing alert event occurred, before the planet was confirmed conclusively, and was detected independently by the MOA and OGLE collaborations.[1] Following the original microlensing event, astronomers predicted another microlensing peak, which was observed by numerous groups using a wide array of telescopes.[1] One of these telescopes was located in Antarctica, and made the first microlensing detections from that continent; however, the data collected there were too crude to be included in the analysis which eventually confirmed the planet.[1]
MOA-2010-BLG-477 L b is the only planet which has been detected orbiting MOA-2010-BLG-477 L. Little is known about this planet, with the only characteristics known about this system are the mass of the planet and its projected separation from its host star.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.5-0.3+1.8 MJ | 2-1+3 | — | — | — | — |
References
- 1 2 3 4 5 6 7 8 9 10 Bachelet, E.; Shin, I.-G.; Han, C.; Fouqué, P.; Gould, A.; Menzies, J. W.; Beaulieu, J.-P.; Bennett, D. P.; et al. (2012). "MOA-2010-BLG-477Lb: Constraining the mass of a microlensing planet from microlensing parallax, orbital motion and detection of blended light". arXiv:1205.6323
. Bibcode:2012ApJ...754...73B. doi:10.1088/0004-637X/754/1/73. - 1 2 3 4 5 6 Schneider, Jean (2 June 2012). "Notes for Star MOA-2010-BLG-477L". The Extrasolar Planets Encyclopaedia.