Pollux b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | Pollux | |
| Constellation | Gemini | |
| Right ascension | (α) | 07h 45m 19.4s |
| Declination | (δ) | +28° 01′ 35″ |
| Apparent magnitude | (mV) | 1.15 |
| Distance | 33.7 ly (10.34 pc) |
|
| Spectral type | K0IIIb | |
| Orbital elements | ||
| Semi-major axis | (a) | 1.64±0.27 AU |
| Eccentricity | (e) | 0.02±0.03 |
| Orbital period | (P) | 589.64±0.81 d (1.61432±0.00222 y) |
| Time of periastron | (T0) | 2,447,739.02±4.5 JD |
| Semi-amplitude | (K) | 41.0±1.6 m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 2.3±0.45 MJ |
| Stellar flux | (F⊙) | 16 ⊕ |
| Discovery information | ||
| Discovery date | 16 June 2006 | |
| Discoverer(s) | Hatzes et al. | |
| Discovery method | Radial velocity | |
| Discovery site |
 United States
|
|
| Discovery status | Published | |
| Other designations | ||
|
Thestias, Beta Geminorum b, HD 62509 b
|
||
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
Pollux b, also designated Beta Geminorum b (abbreviated β Geminorum b, β Gem b) and HD 62509 b, later named Thestias, is an extrasolar planet approximately 34 light-years away in the constellation of Gemini (the Twins). This planet was discovered orbiting the star Pollux in 2006 by astronomer Artie P. Hatzes, confirming his hypothesis originally published in 1993. The planet has a comparable mass to the gas giants in the Solar System. It moves around Pollux in 1.61 years at a distance of 1.64 AU in a nearly circular orbit.
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 Thestias for this planet. The winning name was based on that originally submitted by theSkyNet of Australia; namely Leda, Pollux's mother in Greek and Roman mythology. At the request of the IAU, 'Thestias' (the patronym of Leda, a daughter of Thestius) was substituted. This was because 'Leda' was already attributed to an asteroid and to one of Jupiter's satellites.
Coordinates: 
07h 45m 19.4s, +28° 01′ 35″
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