OGLE-2005-BLG-169L
From Wikipedia, the free encyclopedia
| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 06m 05s |
| Declination | -30° 43' 57" |
| Apparent magnitude (V) | +19.4 |
| Distance | 8,800 ly (2,700 pc) |
| Spectral type | M? |
| Other designations | |
|
EWS 2005-BLG-169L
|
|
OGLE-2005-BLG-169L is a star about 2,700 parsecs away in the constellation Sagittarius. If it is a main sequence star, then it is most likely a red dwarf with about half of the mass of the Sun. Other possibilities are a white dwarf star, or (less likely) a neutron star or black hole.
In 2006, an extrasolar planet was detected around this star.
[edit] OGLE-2005-BLG-169Lb
| Extrasolar planet | Lists of extrasolar planets | |
|---|---|---|
| Microlensing parameters | ||
| Observed separation |
(d) | 2.7 AU |
| Mass ratio | (q) | 8.6×10-5 |
| Impact parameter |
(u0) | 1.24 REinstein |
| Einstein ring crossing time |
(tE) | 42.27 d |
| Time of closest approach |
(t0) | 2,453,491.88 JD |
| Position angle | (φ) | 117.0° |
| Physical characteristics | ||
| Mass | (m) | 0.041 MJ (13 ME) |
| Radius | (r) | ? RJ |
| Density | (ρ) | ? kg/m3 |
| Temperature | (T) | ~70 K |
| Discovery information | ||
| Discovery date | 2006 | |
| Discoverer(s) | MicroFUN, PLANET/RoboNet, OGLE |
|
| Detection method | Gravitational microlensing | |
| Discovery status | Confirmed | |
OGLE-2005-BLG-169Lb is a planet discovered by the OGLE project using the gravitational microlensing method. Based on a most likely mass for the host star of 0.49 solar masses, the planet has a mass of 13 times that of Earth. Its mass and estimated temperature are close to those of Uranus. It is speculated that this planet may either be an ice giant like Uranus, or a "naked super-Earth" with a solid icy or rocky surface.
[edit] See also
[edit] External links
- arxiv.org Microlens OGLE-2005-BLG-169 Implies Cool Neptune-Like Planets are Common
- Extrasolar Encyclopedia: OGLE-05-169L
- Extrasolar Encyclopedia: OGLE-05-169L b
- SPACE.com: Newfound Ice World Alters Perceptions of Planetary Systems
- PLANET/RoboNet microlensing campaign: MICROLENSING EVENT OGLE-2005-blg-169
 |
This main sequence star-related article is a stub. You can help Wikipedia by expanding it. |
 |
This extrasolar planet related article is a stub. You can help Wikipedia by expanding it. |
