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K2-138c

exoplanet in the constellation Aquarius
Thing exoplanet Q77851014
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K2-138c

Summary

K2-138c is an exoplanet[1].

Key Facts

  • K2-138c's instance of is recorded as exoplanet[2].
  • K2-138c's constellation is recorded as Aquarius[3].
  • K2-138c's parent astronomical body is recorded as Q47471235[4].
  • K2-138c's catalog code is recorded as K2-138c[5].
  • K2-138c's catalog code is recorded as EPIC 245950175c[6].
  • K2-138c's catalog code is recorded as TIC 4610830c[7].
  • K2-138c's time of discovery or invention is recorded as +2017-00-00T00:00:00Z[8].
  • K2-138c's time of discovery or invention is recorded as +2018-02-00T00:00:00Z[9].
  • K2-138c's discovery method is recorded as transit method[10].
  • K2-138c's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.296'}[11].
  • K2-138c's orbital inclination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+88.59'}[12].
  • K2-138c's mass is recorded as {'unit': 'http://www.wikidata.org/entity/Q681996', 'amount': '+6.31'}[13].
  • K2-138c's radius is recorded as {'unit': 'http://www.wikidata.org/entity/Q1155470', 'amount': '+2.26'}[14].
  • K2-138c's orbital period is recorded as {'unit': 'http://www.wikidata.org/entity/Q573', 'amount': '+3.56015'}[15].
  • K2-138c's parallax is recorded as {'unit': 'http://www.wikidata.org/entity/Q21500224', 'amount': '+4.9079'}[16].
  • K2-138c's semi-major axis of an orbit is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+0.0442'}[17].
  • K2-138c's argument of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+200'}[18].
  • K2-138c's right ascension is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+348.94903556226210'}[19].
  • K2-138c's declination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '-10.84969380744611'}[20].
  • K2-138c's epoch is recorded as J2000.0[21].
  • K2-138c's declination component of proper motion is recorded as {'unit': 'http://www.wikidata.org/entity/Q22137107', 'amount': '-10.522'}[22].
  • K2-138c's right ascension component of proper motion is recorded as {'unit': 'http://www.wikidata.org/entity/Q22137107', 'amount': '-1.018'}[23].

Body

Definition and Type

K2-138c's instance of is recorded as exoplanet[2].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . SIMBAD. wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . The K2-138 System: A Near-resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists. wikidata.org.
  4. [5] ↑ . Exoplanet Archive. wikidata.org.
  5. [6] ↑ . Exoplanet Archive. wikidata.org.
  6. [7] ↑ . Exoplanet Archive. wikidata.org.
  7. [8] ↑ . Extrasolar Planets Encyclopaedia. wikidata.org.
  8. [9] ↑ . The K2-138 System: A Near-resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists. wikidata.org.
  9. [10] ↑ . The K2-138 System: A Near-resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists. wikidata.org.
  10. [11] ↑ . Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS. wikidata.org.
  11. [12] ↑ . K2-138 g: Spitzer Spots a Sixth Planet for the Citizen Science System. wikidata.org.
  12. [13] ↑ . Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS. wikidata.org.
  13. [14] ↑ . K2-138 g: Spitzer Spots a Sixth Planet for the Citizen Science System. wikidata.org.
  14. [15] ↑ . K2-138 g: Spitzer Spots a Sixth Planet for the Citizen Science System. wikidata.org.
  15. [16] ↑ . Gaia Data Release 2. wikidata.org.
  16. [17] ↑ . K2-138 g: Spitzer Spots a Sixth Planet for the Citizen Science System. wikidata.org.
  17. [18] ↑ . Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS. wikidata.org.
  18. [19] ↑ . Gaia Data Release 2. wikidata.org.
  19. [20] ↑ . Gaia Data Release 2. wikidata.org.
  20. [21] ↑ . SIMBAD. wikidata.org.
  21. [22] ↑ . Gaia Data Release 2. wikidata.org.
  22. [23] ↑ . Gaia Data Release 2. wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

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Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). K2-138c. Retrieved May 7, 2026, from https://4ort.xyz/entity/k2-138c
MLA “K2-138c.” 4ort.xyz Knowledge Graph, 4ort.xyz, 7 May. 2026, https://4ort.xyz/entity/k2-138c.
BibTeX @misc{4ortxyz_k2-138c_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{K2-138c}}, year = {2026}, url = {https://4ort.xyz/entity/k2-138c}, note = {Accessed: 2026-05-07}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): K2-138c — https://4ort.xyz/entity/k2-138c (retrieved 2026-05-07)

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