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Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 19h 53m 16.40s[1]
Declination +47° 16′ 46.2″[1]
Apparent magnitude (g) 15.903[1]
Apparent magnitude (r) 15.301[1]
Apparent magnitude (i) 15.105[1]
Apparent magnitude (z) 14.963[1]
Apparent magnitude (D51) 15.667[1]
Apparent magnitude (J) 14.095[1]
Apparent magnitude (H) 13.727[1]
Apparent magnitude (K) 13.632[1]
J−K color index 0.463[1]
Radius 1.095[1] R
Surface gravity (log g) 4.386[1] cgs
Temperature 5,599[1] K
Metallicity -0.211[1]
Other designations
<<2MASS J195316.40+471646.1>>
KOI 730 6:4:4:3
KOI 730 8:6:4:3

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.[2]

Unconfirmed planetary system[edit]

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.[3] 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.[4] 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.[5]

Fabrycky et al. give the radii as 1.8, 2.1, 2.8, and 2.4 Earth radii with orbital periods of 7.4, 9.8, 14.8, and 19.7 days, respectively.[6][7]


  1. ^ a b c d e f g h i j k l m n o "KIC10 Search". Multimission Archive at STScI. 8 October 2009. Retrieved 5 March 2011. 
  2. ^ 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.  edit
  3. ^ Chown, Marcus (28 February 2011). "Two planets found sharing one orbit". New Scientist. 
  4. ^ Emspak, Jesse (2 March 2011). "Kepler Finds Bizarre Systems". International Business Times. International Business Times Inc. 
  5. ^ Beatty, Kelly (5 March 2011). "Kepler Finds Planets in Tight Dance". Sky and Telescope. 
  6. ^ Sigurðsson, Steinn (12 September 2011) Dynamics of Cats. ExSSII: more transits.
  7. ^ Extrasolar Planets Encyclopaedia, KOI-730

External links[edit]

Coordinates: Sky map 19h 53m 16.40s, +47° 16′ 46.2″