Kepler-89

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title: "Kepler-89" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["planetary-systems-with-four-confirmed-planets", "kepler-objects-of-interest", "cygnus-(constellation)", "f-type-main-sequence-stars", "planetary-transit-variables"] description: "Star in the constellation Cygnus" topic_path: "technology/web" source: "https://en.wikipedia.org/wiki/Kepler-89" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Cygnus ::

| name = Kepler-89 | epoch = J2000 | constell = Cygnus | ra = | dec = | appmag_v = 12.4 | type = main sequence | class = F8 IV-V | radial_v = | prop_mo_ra = | prop_mo_dec = | pm_footnote = | parallax = 2.1069 | p_error = 0.0086 | parallax_footnote = | absmag_v = | source = | mass = | radius = | temperature = 6,116 | metal_fe = | luminosity = | gravity = | rotational_velocity = | age_gyr = | names = | Simbad = Kepler-89 | KIC = 6462863

Kepler-89 is a star with four confirmed planets. Kepler-89 is a possible wide binary star.

Planetary system

The discovery of four planets orbiting the star was announced October 2012 by analyzing data gathered by Kepler space telescope. Follow-up radial velocity measurements confirmed the existence of Kepler-89d, indicating that Kepler-89d is slightly larger and more massive than Saturn. In October 2013, other three planets were confirmed with Kepler-89c and Kepler-89e getting reasonable mass constraints. Transit-timing variations of the outermost planet suggest that additional planets or minor bodies are present in the system.

In 2012, a partial transit of the second outermost planet by the outermost planet was reported. This was the first time a planet-planet transit in front of the star was detected. This allowed to determine the mutual inclination of the planets d and e to be 1.15°.

Stephen R. Kane did a dynamical analysis of the Kepler-89 system that demonstrated that planets c and d, although close to the 2:1 secular resonance, are not permanently in a 2:1 resonance configuration.

| name = Kepler-89 | table_ref = | exoplanet = b | mass_earth = | period = 3.7 | semimajor = 0.05 | eccentricity = | inclination = 89.3 | radius = 0.13}} | exoplanet = c | mass_earth = 7.3-11.8 | period = 10.4 | semimajor = 0.099 | eccentricity = | inclination = 88.36 | radius = 0.31 | exoplanet = d | mass = 0.33±0.034 | period = 22.3 | semimajor = 0.165 | eccentricity = | inclination = 89.871 | radius = 0.83 | exoplanet = e | mass_earth = 11.9-15.5 | period = 54.3 | semimajor = 0.298 | eccentricity = | inclination = 89.76 | radius = 0.49

References

References

1. {{Cite Gaia DR3. 2076970047474270208
2. {{cite constellation. Kepler-89
3. "Planet Kepler-89 b".
4. "First ever discovery of planet-planet eclipse | UTokyo Research". u-tokyo.ac.jp.
5. (2013). "A Discovery of a Candidate Companion to a Transiting System KOI-94: A Direct Imaging Study for a Possibility of a False Positive".
6. (2012). "Planet-Planet Eclipse and the Rossiter-McLaughlin Effect of a Multiple Transiting System: Joint Analysis of the Subaru Spectroscopy and the Kepler Photometry". The Astrophysical Journal.
7. (2019). "Orbital Stability and Precession Effects in the Kepler-89 System". The Astronomical Journal.
8. (2013). "Characterization of the KOI-94 System with Transit Timing Variation Analysis: Implication for the Planet-Planet Eclipse". The Astrophysical Journal.
9. "Kepler-89".
10. (2013). "The Mass of KOI-94d and a Relation for Planet Radius, Mass, and Incident Flux". The Astrophysical Journal.

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