Kepler-22

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Star in the constellation Cygnus

title: "Kepler-22" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["kepler-22", "g-type-main-sequence-stars", "kepler-objects-of-interest", "planetary-transit-variables", "cygnus-(constellation)", "planetary-systems-with-one-confirmed-planet"] description: "Star in the constellation Cygnus" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/Kepler-22" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Cygnus ::

| image = [[File:Kepler-22_diagram.jpg|250px]] | caption = This diagram compares the Solar System to Kepler-22 | epoch = J2000 | constell = Cygnus | ra = | dec = | appmag_v = 11.664 | type = main sequence | class = G5V | appmag_1_passband =
| appmag_1 = | appmag_2_passband =
| appmag_2 = | appmag_3_passband =
| appmag_3 = | appmag_4_passband =
| appmag_4 = | appmag_5_passband =
| appmag_5 = | r-i = | v-r = | b-v =
| u-b = | variable = | radial_v = | prop_mo_ra = | prop_mo_dec = | pm_footnote = | parallax = 5.0627 | p_error = 0.0110 | parallax_footnote = | absmag_v = ~5.27 | absmag_bol = ~4.98 | mass = | radius = | luminosity_bolometric = 0.79 ± 0.04 | luminosity_visual = ~0.67 | temperature = | metal_fe = | rotational_velocity = 0.6 ± 1.0 | age_gyr = | names = | Simbad = Kepler-22 | NSTED = Kepler-22 | KIC = 10593626 Extrasolar Planets Encyclopaediadata Kepler-22 is a Sun-like star in the northern constellation of Cygnus, the swan, that is orbited by a planet found to be unequivocally within the star's habitable zone. It is located at the celestial coordinates: Right Ascension , Declination . With an apparent visual magnitude of 11.7, this star is too faint to be seen with the naked eye. It can be viewed with a telescope having an aperture of at least 4 in. The estimated distance to Kepler-22 is 644 ly.

TOC

Stellar characteristics

Kepler-22 is slightly smaller and cooler than the Sun, with a lower abundance of elements having more mass than helium.

Planetary system

| table_ref = | exoplanet = b | mass_earth = | semimajor = | period = | inclination = | radius_earth = | eccentricity =

On December 5, 2011, scientists from the Kepler mission announced that an exoplanet, Kepler-22b, had been discovered orbiting in the star's habitable zone by NASA's Kepler spacecraft. This was significant in that it was the first relatively small exoplanet (about ) confirmed to be orbiting within a star's habitable zone. Its size suggests that it is not likely to be a rocky planet and is more likely to be a mini-Neptune or ocean world; while its mass has not been measured, radial velocity observations have set an upper limit of .

In popular culture

Kepler-22b is the source of the extraterrestrial signal which starts the events in the television show Pluribus.

References

| first1=Jean | last1=Schneider | title=Star: Kepler-22 | url=https://exoplanet.eu/catalog/kepler_22_b--1029/ | encyclopedia=Extrasolar Planets Encyclopaedia | access-date=2020-12-17 }}

| title=GSC 03546-02301 -- Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%406293726&Name=GSC%2003546-02301 | access-date=2011-12-08 }}

References

  1. (2011-12-05). "Kepler Confirms First Planet in Habitable Zone of Sun-Like Star". Universe Today.
  2. (2015). "The Host Stars of Kepler's Habitable Exoplanets: Superflares, Rotation and Activity". Monthly Notices of the Royal Astronomical Society.
  3. Boyle, Rebecca. (December 5, 2011). "Kepler Team Confirms First Earth-like planet in a habitable zone, And Finds 1,094 More Worlds". Popular Science.
  4. (2011-12-05). "NASA Telescope Confirms Alien Planet in Habitable Zone". Space.com.
  5. (2025-12-19). "Charm Offensive".
  6. {{Cite Gaia DR3. 2127941757262806656
  7. "Kepler-22b".
  8. (December 21, 2004). "The Colour of Stars". [[Commonwealth Scientific and Industrial Research Organisation]].
  9. (2003). "A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations". [[Courier Dover Publications]].
  10. (February 2012). "Kepler-22b: A 2.4 Earth-radius Planet in the Habitable Zone of a Sun-like Star". [[The Astrophysical Journal]].
  11. (April 2023). "Cold Jupiters and improved masses in 38 Kepler and K2 small-planet systems from 3661 high-precision HARPS-N radial velocities. No excess of cold Jupiters in small-planet systems". [[Astronomy & Astrophysics]].
  12. {{Cite constellation. Kepler-22

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

kepler-22g-type-main-sequence-starskepler-objects-of-interestplanetary-transit-variablescygnus-(constellation)planetary-systems-with-one-confirmed-planet