Kepler-70b
| Exoplanet | List of exoplanets | |
|---|---|---|
 |
||
| Parent star | ||
| Star | Kepler-70 | |
| Constellation | Cygnus | |
| Right ascension | (α) | 19h 45m 25s |
| Declination | (δ) | +41° 5′ 34″ |
| Apparent magnitude | (mV) | 14.87 |
| Distance | 3849 ± 310 ly (1180 ± 95 pc) |
|
| Spectral type | sdB | |
| Mass | (m) | 0.496 ± 0.002 M☉ |
| Radius | (r) | 0.203 ± 0.007 R☉ |
| Temperature | (T) | 27730 ± 270 K |
| Orbital elements | ||
| Semi-major axis | (a) | 0.006 AU (0.897 Gm) |
| Orbital period | (P) | 0.2401 ± 0.000004 d |
| Inclination | (i) | ~65° |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 0.440 M⊕ |
| Radius | (r) | 0.759 R⊕ |
| Density | (ρ) | 5500 kg m−3 |
| Stellar flux | (F⊙) | 6.4x105⊕ |
| Temperature | (T) | 7,143 K (6,870 °C; 12,398 °F) |
| Discovery information | ||
| Discovery date | 12/22/2011 (announced) | |
| Discoverer(s) | Charpinet et al. | |
| Discovery method | Reflection/emission modulations | |
| Discovery site | Kepler telescope | |
| Discovery status | Published | |
| Other designations | ||
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
Kepler-70b (formerly known as its Kepler Object of Interest designation KOI-55.01; sometimes listed as KOI-55 b) is an exoplanet discovered orbiting the subdwarf B star (sdB) Kepler-70. It orbits its host along with another planet, Kepler-70c, both of which orbit very close to their host star. Kepler-70b completes one orbit around its star in just 5.76 hours, one of the shortest orbital periods of any exoplanetary system yet discovered, only second to the exoplanet PSR 1719-14 b with a period of 2.2 hours. It is also the hottest exoplanet as of mid-2013, with a surface temperature of 7,143 K (6,870 °C; 12,398 °F). Its density is 5500 kg/m3 which is not much different from Earth.
Kepler-70b is likely a rocky exoplanet with a mass of 0.44 M⊕ and a radius of 0.76 R⊕. It has a surface temperature of 7,143 K (6,870 °C; 12,398 °F), one of the hottest known surface temperatures on any exoplanet. It is even hotter then the surface of the Sun, by about ~1500 K.
The exoplanet has an orbit period shorter than any exoplanet known to date, with an orbital period of 5.76 hours (345 minutes). This comes in second to the exoplanet PSR 1719-14 b, which, coincidentally, orbits a stellar remnant, much like the planets of Kepler-70.
The host star, Kepler-70 (also formally known as KOI-55, 2MASS J19452546+4105339 or KIC 5807616), is a subdwarf B-type star that has left its red giant stage of its lifetime – according to the Extrasolar Planets Encyclopedia – about 18.4 million years ago. It has a surface temperature of 27730 ± 270 K, nearly 6 times as hot as the surface temperature of the Sun, which has a surface temperature of 5778 K. The star has a mass of 0.496 M☉ and a radius of 0.203 R☉ It is expected to become a white dwarf in the future, after fusing the remaining helium in its core, and shrink in size to around the size of the Earth.
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