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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. Preliminary studies indicate that the KOI-730 star system consists of 4 planets orbiting the star.
Unconfirmed planetary system
An as-yet unconfirmed planetary system has been detected by the Kepler mission, containing four planet candidates. 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.
- "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:1102.0541. Bibcode:2011ApJ...736...19B. doi:10.1088/0004-637X/736/1/19.
- 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.
- Sigurðsson, Steinn (12 September 2011) Dynamics of Cats. ExSSII: more transits. scienceblogs.com
- Extrasolar Planets Encyclopaedia, KOI-730
- "Planetary System KOI-730 Exhibiting a Pair of Co-Orbital Planets" (this site requires a browser with support for WebGL)
- 2MASS Catalog Retrieval
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