Kepler-452
 Artist's impression of the Kepler-452 and Kepler-186 systems compared to the inner Solar System, with their respective habitable zones shown. |
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| Characteristics | |
|---|---|
| Evolutionary stage | Main sequence |
| Spectral type | G2V |
| Observation data Epoch J2000 Equinox J2000 |
|
| Constellation | Cygnus |
| Right ascension | 19h 44m 0.9s |
| Declination | +44° 16′ 39.2″ |
| Apparent magnitude (V) | 13.426 |
| Astrometry | |
| Distance | 1400 ly (430 pc) |
| Details | |
| Mass | 1.037+0.054 −0.047 M☉ |
| Radius | 1.11+0.15 −0.09 R☉ |
| Luminosity | 1.2 L☉ |
| Surface gravity (log g) | 4.32 ± 0.09 cgs |
| Temperature | 5757 ± 85 K |
| Metallicity [Fe/H] | 0.21 ± 0.09 dex |
| Age | 6 ± 2 Gyr |
| Other designations | |
| Database references | |
| Exoplanet Archive | 452-b data |
Kepler-452 is a G-type main-sequence star located about 1400 light-years away from Earth in the constellation of Cygnus. It has a similar temperature to that of the Sun, but it is 20 percent brighter, 3.7 percent more massive and is 11 percent larger. It is approximately six billion years old, 1.5 billion years older than the Sun and also has a much higher metallicity. Thus, Kepler-452 can be considered a solar twin, however its age pushes it more back towards the "solar analog" criteria.
Prior to Kepler observation, Kepler-452 had the 2MASS catalogue number 2MASS 19440088+4416392. In the Kepler Input Catalog it has the designation of KIC 8311864, and when it was found to have a transiting planet candidate it was given the Kepler object of interest number of KOI-7016.
Planetary candidates were detected around the star by NASA's Kepler Mission, a mission tasked with discovering planets in transit around their stars. The transit method that Kepler uses involves detecting dips in brightness in stars. These dips in brightness can be interpreted as planets whose orbits pass in front of their stars from the perspective of Earth, although other phenomenon can also be responsible which is why the term planetary candidate is used.
Following the acceptance of the discovery paper, the Kepler team provided an additional moniker for the system of "Kepler-452". The discoverers referred to the star as Kepler-452, which is the normal procedure for naming the exoplanets discovered by the spacecraft. Hence, this is the name used by the public to refer to the star and its planet.
Candidate planets that are associated with stars studied by the Kepler Mission are assigned the designations ".01" etc. after the star's name, in the order of discovery. If planet candidates are detected simultaneously, then the ordering follows the order of orbital periods from shortest to longest. Following these rules, there was only one candidate planet detected, with an orbital period of 384.843 days. The name Kepler-452 derives directly from the fact that the star is the catalogued 452nd star discovered by Kepler to have confirmed planets.
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