Kepler-90
| Observation data Epoch 2000 Equinox 2000 |
|
|---|---|
| Constellation | Draco |
| Right ascension | 18h 57m 44.038s |
| Declination | +49° 18′ 18.58″ |
| Apparent magnitude (V) | 14 |
| Characteristics | |
| Spectral type | G0V |
| Astrometry | |
| Distance | 2545ly (780pc) |
| Details | |
| Mass | 1.2 ± 0.1 M☉ |
| Radius | 1.2 ± 0.1 R☉ |
| Surface gravity (log g) | 4.4 cgs |
| Temperature |
6080+260 −170 K |
| Metallicity [Fe/H] | −0.12 ± 0.18 dex |
| Rotational velocity (v sin i) | 4.6 ± 2.1 km/s |
| Age | ~2 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia |
data |
| KIC | data |
Kepler-90 is a G-type main sequence star located about 2,545 light-years (780 pc) from Earth in the constellation of Draco. It is notable for having a planetary system that has the second-largest number of observed exoplanets in the Milky Way.
Prior to Kepler observation, Kepler-90 had the 2MASS catalogue number 2MASS J18574403+4918185. In the Kepler Input Catalog it has the designation of KIC 11442793, and when it was found to have a transiting planet candidate it was given the Kepler object of interest number of KOI-351.
The star's planetary companion was discovered 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 move in front of their stars from the perspective of Earth. The name Kepler-90 derives directly from the fact that the star is the catalogued 90th star discovered by Kepler to have confirmed planets.
The designation b, c, d, e, f, g, and h derives from the order of discovery. The designation of b is given to the first planet orbiting a given star, followed by the other lowercase letters of the alphabet. In the case of Kepler-90, there were seven planets discovered, so designations up to h are used.
Kepler-90 is a G-type star that is approximately 120% the mass and radius of the Sun. It has a surface temperature of 6080 K, and an estimated age of around 2 billion years. In comparison, the Sun is about 4.6 billion years old and has a surface temperature of 5778 K.
The star's apparent magnitude, or how bright it appears from Earth's perspective, is 14. Therefore, it is too dim to be seen with the naked eye.
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