Kepler-9
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 2m 17.76s |
| Declination | +38° 24′ 3.2″ |
| Apparent magnitude (V) | 13.9 |
| Astrometry | |
| Distance | 650pc |
| Characteristics | |
| Spectral type | G2V |
| Details | |
| Mass | 1.07 M☉ |
| Radius | 1.02 R☉ |
| Surface gravity (log g) | 4.49 ± 0.09 cgs |
| Temperature | 5777 ± 61 K |
| Metallicity | [Fe/H] = +0.12 ± 0.04 |
| Age | ~1 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Kepler-9 is a sunlike star in the constellation Lyra. Its planetary system, discovered by the Kepler Mission in 2010 was the first detected with the transit method found to contain multiple planets.
Kepler-9 was named for the Kepler Mission, a project headed by NASA that was designed to search for Earth-like planets. Unlike stars such as Aldebaran or Sirius, Kepler-9 does not have a colloquial name.
In June 2010, some 43 days after Kepler came online, its operating scientists submitted a list of over 700 exoplanet candidates for review. Of those, five were originally suspected to have more than one planet. Kepler-9 was one of the multiplanetary systems; it was identified as such when scientists noticed significant variations in the time intervals at which Kepler-9 was transited. Kepler-9 holds the first multiplanetary system discovered using the transit method. It is also the first planetary system where transiting planets were confirmed through transit timing variations method, allowing to calculate the masses of planets. The discovery of the planets was announced on August 26, 2010.
Kepler-9 is located in the constellation Lyra that lies some 650 parsecs away from Earth. With a mass of 1.07 M☉ and a radius of 1.02 R☉, Kepler-9 is almost exactly the same size and width of the Sun, being only 7% more massive and 2% wider. Kepler-9 has an effective temperature of 5777 (± 61) K, as compared to the Sun's at 5778 K, and is approximately 32% more metal-rich (in terms of iron) than the Sun. Kepler-9 is younger than the Sun, and is estimated to be one billion years old.
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