Kepler-223

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G5V star in the constellation Cygnus

title: "Kepler-223" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["planetary-systems-with-four-confirmed-planets", "g-type-subgiants", "kepler-objects-of-interest", "cygnus-(constellation)", "planetary-transit-variables"] description: "G5V star in the constellation Cygnus" topic_path: "technology/web" source: "https://en.wikipedia.org/wiki/Kepler-223" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary G5V star in the constellation Cygnus ::

| name = Kepler-223 | epoch = J2000.0 | constell = Cygnus | ra = | dec = | appmag_v = 15.3 | type = subgiant | class = G8 | b-v = | appmag_1_passband = g | appmag_1 = 15.903 | appmag_2_passband = r | appmag_2 = 15.301 | appmag_3_passband = i | appmag_3 = 15.105 | appmag_4_passband = z | appmag_4 = 14.963 | appmag_5_passband = D51 | appmag_5 = 15.667 | appmag_6_passband = J | appmag_6 = 14.095 | appmag_7_passband = H | appmag_7 = 13.727 | appmag_8_passband = K | appmag_8 = 13.632 | appmag_9_passband = Kepler | appmag_9 = 15.344 | j-k = 0.463 | radial_v = | prop_mo_ra = | prop_mo_dec = | pm_footnote = | parallax = 0.5005 | p_error = 0.0215 | parallax_footnote = | absmag_v = | mass = 1.04 | radius = 1.52 | gravity = 4.09 | temperature = 5,803 | metal_fe = −0.211 | rotation = 17.82 days | rotational_velocity = 2.4 | age_gyr = 3.7 | names = | Simbad = Kepler-223 | KIC = 10227020

Kepler-223 (KOI-730, KIC 10227020) is a G8 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.

Planetary system

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.

|title= |align=center |width= |mode=nolines |File:KOI 730 3-4-4-6.png|Kepler-223 6:4:4:3 orbital ratios |File:KOI 730 3-4-6-8.png|Kepler-223 8:6:4:3 orbital ratios

References

|date=8 October 2009 |title=KIC10 Search |url=http://archive.stsci.edu/kepler/kic10/search.php |publisher=Multimission Archive at STScI |access-date=5 March 2011

References

  1. (2011). "Characteristics of planetary candidates observed by Kepler, II: Analysis of the first four months of data". [[The Astrophysical Journal]].
  2. Chown, Marcus. (28 February 2011). "Two planets found sharing one orbit". New Scientist.
  3. Emspak, Jesse. (2 March 2011). "Kepler Finds Bizarre Systems". International Business Times Inc..
  4. Beatty, Kelly. (5 March 2011). "Kepler Finds Planets in Tight Dance". Sky and Telescope.
  5. (2016-05-11). "A resonant chain of four transiting, sub-Neptune planets". Nature.
  6. Koppes, S.. (2016-05-17). "Kepler-223 System: Clues to Planetary Migration".
  7. {{Cite Gaia DR3. 2086337508581280256
  8. "Kepler-223".
  9. {{cite constellation. Kepler-223
  10. (2018). "Inferring probabilistic stellar rotation periods using Gaussian processes". Monthly Notices of the Royal Astronomical Society.
  11. (2022). "The California-Kepler Survey. X. The Radius Gap as a Function of Stellar Mass, Metallicity, and Age". The Astronomical Journal.
  12. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal.
  13. (2018). "LAMOST Observations in the Kepler Field. II. Database of the Low-resolution Spectra from the Five-year Regular Survey". The Astrophysical Journal Supplement Series.

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planetary-systems-with-four-confirmed-planetsg-type-subgiantskepler-objects-of-interestcygnus-(constellation)planetary-transit-variables