HD149026 b
| Exoplanet | List of exoplanets | |
|---|---|---|
 |
||
| Parent star | ||
| Star | HD 149026 | |
| Constellation | Hercules | |
| Right ascension | (α) | 16h 30m 29.619s |
| Declination | (δ) | +38° 20′ 50.31″ |
| Distance | 257 ly (78.9 ± 6.6 pc) |
|
| Spectral type | G0IV | |
| Orbital elements | ||
| Semi-major axis | (a) | 0.042 AU |
| Eccentricity | (e) | 0 |
| Orbital period | (P) | 2.8758882 ± 0.0000061 d |
| Time of periastron | (T0) | 2,453,530.751 JD |
| Semi-amplitude | (K) | 43.2 ± 2.6 m/s |
| Physical characteristics | ||
| Mass | (m) | 0.36 ± 0.03 MJ |
| Radius | (r) | 0.725 ± 0.03 RJ |
| Density | (ρ) | 1252 kg m−3 |
| Temperature | (T) | 2,300 K (2,030 °C; 3,680 °F) |
| Discovery information | ||
| Discovery date | 1 July 2005 | |
| Discoverer(s) |
B. Sato, D. Fischer, G. Henry et al. |
|
| Discovery method | Radial velocity | |
| Other detection methods | Transit, Orbital light variations |
|
| Discovery site | W. M. Keck Observatory | |
| Discovery status | Confirmed | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
HD 149026 b, also named Smertrios, is an extrasolar planet approximately 257 light-years from the Sun in the constellation of Hercules.
The 2.8766-day period planet orbits the yellow subgiant star HD 149026 at a distance of 0.042 AU and is notable first as a transiting planet, and second for a small measured radius (relative to mass and incoming heat) that suggests an exceptionally large planetary core.
Following its discovery in 2005 the planet was designated HD 149026 b. In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their host stars. The process involved public nomination and voting for the new names. In December 2015, the IAU announced the winning name was Smertrios for this planet. The winning name was submitted by the Club d'Astronomie de Toussaint of France. Smertrios was a Gallic deity of war.
The planet was discovered by the N2K Consortium in 2005, which searches stars for closely orbiting giant planets similar to 51 Pegasi b using the highly successful radial velocity method. The spectrum of the star was studied from the Keck and Subaru Telescopes. After the planet was first detected from the Doppler effect it caused in the light of the host star, it was studied for transits at the Fairborn Observatory. A tiny decrease of light (0.003 magnitudes) was detected every time the planet was transiting the star, thus confirming its existence.
...
Wikipedia