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Epoch J2000.0 Equinox J2000.0
|Right ascension||19h 53m 16.40s|
|Declination||+47° 16′ 46.2″|
|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|
|Surface gravity (log g)||4.386 cgs|
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.
- "KIC10 Search". Multimission Archive at STScI. 8 October 2009. Retrieved 5 March 2011.
- Borucki, William J.; Koch, David G.; Basri, Gibor; Batalha, Natalie; Brown, Timothy M.; Bryson, Stephen T.; Caldwell, Douglas; Christensen-Dalsgaard, Jørgen; Cochran, William D.; Devore, Edna; Dunham, Edward W.; Gautier, Thomas N.; Geary, John C.; Gilliland, Ronald; Gould, Alan; Howell, Steve B.; Jenkins, Jon M.; Latham, David W.; Lissauer, Jack J.; Marcy, Geoffrey W.; Rowe, Jason; Sasselov, Dimitar; Boss, Alan; Charbonneau, David; Ciardi, David; Doyle, Laurance; Dupree, Andrea K.; Ford, Eric B.; Fortney, Jonathan; et al. (2011). "Characteristics of planetary candidates observed by Kepler, II: Analysis of the first four months of data". The Astrophysical Journal. 736 (1): 19. arXiv: . Bibcode:2011ApJ...736...19B. doi:10.1088/0004-637X/736/1/19.
- Mills, S. M.; Fabrycky, D. C.; Migaszewski, C.; Ford, E. B.; Petigura, E.; Isaacson, H. (2016-05-11). "A resonant chain of four transiting, sub-Neptune planets". Nature. 533: 509–512. doi:10.1038/nature17445.
- Koppes, S. (2016-05-17). "Kepler-223 System: Clues to Planetary Migration". Jet Propulsion Lab. Retrieved 2016-05-18.
- Chown, Marcus (28 February 2011). "Two planets found sharing one orbit". New Scientist.
- Emspak, Jesse (2 March 2011). "Kepler Finds Bizarre Systems". International Business Times. International Business Times Inc.
- Beatty, Kelly (5 March 2011). "Kepler Finds Planets in Tight Dance". Sky and Telescope.
- "Planetary System KOI-730 Exhibiting a Pair of Co-Orbital Planets" (this site requires a browser with support for WebGL)
- 2MASS Catalog Retrieval