KOI-730
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 53m 16.40s |
| Declination | +47° 16′ 46.2″ |
| Characteristics | |
| Apparent magnitude (g) | 15.903 |
| Apparent magnitude (r) | 15.301 |
| Apparent magnitude (i) | 15.105 |
| Apparent magnitude (z) | 14.963 |
| Apparent magnitude (D51) | 15.667 |
| Apparent magnitude (J) | 14.095 |
| Apparent magnitude (H) | 13.727 |
| Apparent magnitude (K) | 13.632 |
| J−K color index | 0.463 |
| Details | |
| Radius | 1.095 R☉ |
| Surface gravity (log g) | 4.386 cgs |
| Temperature | 5,599 K |
| Metallicity | -0.211 |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Kepler-223 (KOI-730, KIC #10227020) is a G5V star with an extrasolar planetary system discovered by the Kepler mission. Studies indicate that the Kepler-223 star system consists of 4 planets orbiting the star.
The confirmed planetary system was first detected by the Kepler mission, and contains four planets. This system was initially believed to contain two co-orbital planets orbiting the star at approximately the same orbital distance every 9.8 days, with one permanently locked 60° behind the other in one of the two Trojan Lagrangian points. The two co-orbital planets were thought to be locked in mean motion resonances with the other two planets, creating an overall 6:4:4:3 resonance. This would have been the first known example of co-orbital planets.
However follow-up study of the system revealed that an alternative configuration, with the four planets having orbital periods in the ratio 8:6:4:3 is better supported by the data. This configuration does not contain co-orbital planets, and has been confirmed by further observations. It represents the first confirmed 4-body orbital resonance.
The radii are 3.0, 3.4, 5.2, and 4.6 Earth radii, and the orbital periods are 7.3845, 9.8456, 14.7887 and 19.7257 days, respectively.
Coordinates: 
19h 53m 16.40s, +47° 16′ 46.2″
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