HD 121504 b

extrasolar planet in the constellation Centaurus
Place exoplanet Q52992
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HD 121504 b

Summary

HD 121504 b is an exoplanet[1]. It draws 2 Wikipedia views per month (exoplanet category, ranking #96 of 578).[2]

Key Facts

  • HD 121504 b is credited with the discovery of Michel Mayor[3].
  • HD 121504 b's instance of is recorded as exoplanet[4].
  • HD 121504 b's constellation is recorded as Centaurus[5].
  • HD 121504 b's site of astronomical discovery is recorded as La Silla Observatory[6].
  • HD 121504 b's parent astronomical body is recorded as HD 121504[7].
  • HD 121504 b's catalog code is recorded as HD 121504b[8].
  • HD 121504 b's catalog code is recorded as TIC 208844024b[9].
  • HD 121504 b's time of discovery or invention is recorded as +2003-00-00T00:00:00Z[10].
  • HD 121504 b's time of discovery or invention is recorded as +2004-02-00T00:00:00Z[11].
  • HD 121504 b's Freebase ID is recorded as /m/04y5nfl[12].
  • HD 121504 b's discovery method is recorded as Doppler spectroscopy[13].
  • HD 121504 b's orbital eccentricity is recorded as {'amount': '+0.03'}[14].
  • HD 121504 b's M sin i is recorded as {'unit': 'Q651336', 'amount': '+1.51'}[15].
  • HD 121504 b's mass is recorded as {'unit': 'Q651336', 'amount': '+1.22'}[16].
  • HD 121504 b's orbital period is recorded as {'unit': 'Q573', 'amount': '+63.33'}[17].
  • HD 121504 b's parallax is recorded as {'unit': 'Q21500224', 'amount': '+23.9754'}[18].
  • HD 121504 b's semi-major axis of an orbit is recorded as {'unit': 'Q1811', 'amount': '+0.33'}[19].
  • HD 121504 b's argument of periapsis is recorded as {'unit': 'Q28390', 'amount': '+265'}[20].
  • HD 121504 b's SIMBAD ID is recorded as HD 121504b[21].
  • HD 121504 b's Wolfram Language entity code is recorded as Entity["Exoplanet", "HD121504b"][22].
  • HD 121504 b's Extrasolar Planets Encyclopaedia exoplanet ID is recorded as hd_121504_ab--39[23].
  • HD 121504 b's NASA Exoplanet Archive ID is recorded as HD 121504 b[24].
  • HD 121504 b's right ascension is recorded as {'unit': 'Q28390', 'amount': '+209.32182670548875'}[25].
  • HD 121504 b's declination is recorded as {'unit': 'Q28390', 'amount': '-56.04004342030028'}[26].
  • HD 121504 b's epoch is recorded as J2000.0[27].

Body

Designation and Status

HD 121504 b's instance of is recorded as exoplanet[4].

History and Context

Catalog codes include HD 121504b[8] and TIC 208844024b[9].

Why It Matters

HD 121504 b draws 2 Wikipedia views per month (exoplanet category, ranking #96 of 578).[2] It has Wikipedia articles in 9 language editions, a strong signal of global cultural recognition.[28] It is known by 3 alternative names across languages and contexts.[29]

References

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

Direct Wikidata claims

  1. [4] . SIMBAD. wikidata.org.
  2. [5] . wikidata.org.
  3. [3] . wikidata.org.
  4. [6] . wikidata.org.
  5. [7] . SIMBAD. wikidata.org.
  6. [8] . SIMBAD. wikidata.org.
  7. [9] . Exoplanet Archive. wikidata.org.
  8. [10] . Extrasolar Planets Encyclopaedia. wikidata.org.
  9. [11] . The CORALIE survey for southern extrasolar planets. XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE. wikidata.org.
  10. [12] . Freebase Data Dumps. wikidata.org.
  11. [13] . The CORALIE survey for southern extrasolar planets. XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE. wikidata.org.
  12. [14] . The CORALIE survey for southern extrasolar planets. XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE. wikidata.org.
  13. [15] . Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes. wikidata.org.
  14. [16] . Extrasolar Planets Encyclopaedia. wikidata.org.
  15. [17] . Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes. wikidata.org.
  16. [18] . Gaia Data Release 2. wikidata.org.
  17. [19] . Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes. wikidata.org.
  18. [20] . The CORALIE survey for southern extrasolar planets. XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE. wikidata.org.
  19. [21] . wikidata.org.
  20. [22] . wikidata.org.
  21. [23] . wikidata.org.
  22. [24] . wikidata.org.
  23. [25] . Gaia Data Release 2. wikidata.org.
  24. [26] . Gaia Data Release 2. wikidata.org.
  25. [27] . SIMBAD. wikidata.org.

Class ancestry

  1. [1] . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] . Wikimedia Foundation. dumps.wikimedia.org.
  2. [28] . Wikidata sitelinks. wikidata.org.
  3. [29] . Wikidata aliases. wikidata.org.

📑 Cite this page

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). HD 121504 b. Retrieved May 3, 2026, from https://4ort.xyz/entity/hd-121504-b
MLA “HD 121504 b.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/hd-121504-b.
BibTeX @misc{4ortxyz_hd-121504-b_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{HD 121504 b}}, year = {2026}, url = {https://4ort.xyz/entity/hd-121504-b}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): HD 121504 b — https://4ort.xyz/entity/hd-121504-b (retrieved 2026-05-03)

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