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BD-21 397 c

extrasolar planet
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BD-21 397 c

Summary

BD-21 397 c is an exoplanet[1].

Key Facts

  • BD-21 397 c's instance of is recorded as exoplanet[2].
  • BD-21 397 c's constellation is recorded as Cetus[3].
  • BD-21 397 c's parent astronomical body is recorded as BD-210397[4].
  • BD-21 397 c's catalog code is recorded as TIC 268804174c[5].
  • BD-21 397 c's time of discovery or invention is recorded as +2023-06-00T00:00:00Z[6].
  • BD-21 397 c's discovery method is recorded as Doppler spectroscopy[7].
  • BD-21 397 c's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.1'}[8].
  • BD-21 397 c's orbital inclination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+33'}[9].
  • BD-21 397 c's M sin i is recorded as {'unit': 'http://www.wikidata.org/entity/Q651336', 'amount': '+2.4'}[10].
  • BD-21 397 c's mass is recorded as {'unit': 'http://www.wikidata.org/entity/Q651336', 'amount': '+4.8'}[11].
  • BD-21 397 c's orbital period is recorded as {'unit': 'http://www.wikidata.org/entity/Q573', 'amount': '+6360'}[12].
  • BD-21 397 c's semi-major axis of an orbit is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+5.9'}[13].
  • BD-21 397 c's argument of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+6'}[14].
  • BD-21 397 c's Extrasolar Planets Encyclopaedia exoplanet ID is recorded as bd_21_397_c--8790[15].
  • BD-21 397 c's NASA Exoplanet Archive ID is recorded as BD-210397 c[16].
  • BD-21 397 c's right ascension is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+33.3024198'}[17].
  • BD-21 397 c's declination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '-21.1962147'}[18].
  • BD-21 397 c's epoch is recorded as J2000.0[19].
  • BD-21 397 c's time of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q14267', 'amount': '+56490'}[20].

Body

Designation and Status

BD-21 397 c's instance of is recorded as exoplanet[2].

History and Context

BD-21 397 c's catalog code is recorded as TIC 268804174c[5].

References

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

Direct Wikidata claims

  1. [2] ↑ . A multi-technique approach to identifying and/or constraining radial-velocity substellar companions. wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries. wikidata.org.
  4. [5] ↑ . Exoplanet Archive. wikidata.org.
  5. [6] ↑ . The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries. wikidata.org.
  6. [7] ↑ . The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries. wikidata.org.
  7. [8] ↑ . The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries. wikidata.org.
  8. [9] ↑ . A multi-technique approach to identifying and/or constraining radial-velocity substellar companions. wikidata.org.
  9. [10] ↑ . The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries. wikidata.org.
  10. [11] ↑ . A multi-technique approach to identifying and/or constraining radial-velocity substellar companions. wikidata.org.
  11. [12] ↑ . The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries. wikidata.org.
  12. [13] ↑ . The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries. wikidata.org.
  13. [14] ↑ . The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries. wikidata.org.
  14. [15] ↑ . wikidata.org.
  15. [16] ↑ . wikidata.org.
  16. [17] ↑ . The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries. wikidata.org.
  17. [18] ↑ . The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries. wikidata.org.
  18. [19] ↑ . Exoplanet Archive. wikidata.org.
  19. [20] ↑ . The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries. 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). BD-21 397 c. Retrieved May 3, 2026, from https://4ort.xyz/entity/bd-21-397-c
MLA “BD-21 397 c.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/bd-21-397-c.
BibTeX @misc{4ortxyz_bd-21-397-c_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{BD-21 397 c}}, year = {2026}, url = {https://4ort.xyz/entity/bd-21-397-c}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): BD-21 397 c — https://4ort.xyz/entity/bd-21-397-c (retrieved 2026-05-03)

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