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(64821) 2001 XJ239

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(64821) 2001 XJ239

Summary

(64821) 2001 XJ239 is an asteroid[1].

Key Facts

  • (64821) 2001 XJ239 is credited with the discovery of Lincoln Near-Earth Asteroid Research[2].
  • (64821) 2001 XJ239's instance of is recorded as asteroid[3].
  • (64821) 2001 XJ239's site of astronomical discovery is recorded as Experimental Test Site[4].
  • (64821) 2001 XJ239 followed (64820) 2001 XR238[5].
  • (64821) 2001 XJ239 was followed by (64822) 2001 XM240[6].
  • (64821) 2001 XJ239's minor planet group is recorded as asteroid belt[7].
  • (64821) 2001 XJ239's parent astronomical body is recorded as Sun[8].
  • (64821) 2001 XJ239's provisional designation is recorded as 2001 XJ239[9].
  • (64821) 2001 XJ239's time of discovery or invention is recorded as December 15, 2001[10].
  • (64821) 2001 XJ239's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.1258674334439454'}[11].
  • (64821) 2001 XJ239's absolute magnitude is recorded as {'unit': '1', 'amount': '+15.74'}[12].
  • (64821) 2001 XJ239's orbital inclination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+1.927462414487689'}[13].
  • (64821) 2001 XJ239's orbital period is recorded as {'unit': 'http://www.wikidata.org/entity/Q573', 'amount': '+1247.505811101752'}[14].
  • (64821) 2001 XJ239's longitude of ascending node is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+329.7434900877974'}[15].
  • (64821) 2001 XJ239's semi-major axis of an orbit is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.267928891711276'}[16].
  • (64821) 2001 XJ239's apoapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.553387280544346'}[17].
  • (64821) 2001 XJ239's periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+1.982470502878206'}[18].
  • (64821) 2001 XJ239's argument of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+353.8359982369405'}[19].
  • (64821) 2001 XJ239's mean anomaly is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+359.6988825738594'}[20].
  • (64821) 2001 XJ239's diameter is recorded as {'unit': 'http://www.wikidata.org/entity/Q828224', 'amount': '+4.211'}[21].
  • (64821) 2001 XJ239's albedo is recorded as {'unit': '1', 'amount': '+0.069'}[22].
  • (64821) 2001 XJ239's epoch is recorded as October 17, 2024[23].
  • (64821) 2001 XJ239's time of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q14267', 'amount': '+2460601.543460386'}[24].

Body

Designation and Status

(64821) 2001 XJ239's instance of is recorded as asteroid[3].

References

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

Direct Wikidata claims

  1. [3] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  2. [2] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  3. [4] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  9. [10] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  10. [11] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  11. [12] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  12. [13] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  13. [14] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  14. [15] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  15. [16] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  16. [17] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  17. [18] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  18. [19] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  19. [20] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  20. [21] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  21. [22] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  22. [23] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  23. [24] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. 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). (64821) 2001 XJ239. Retrieved May 3, 2026, from https://4ort.xyz/entity/-64821-2001-xj239
MLA “(64821) 2001 XJ239.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/-64821-2001-xj239.
BibTeX @misc{4ortxyz_-64821-2001-xj239_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(64821) 2001 XJ239}}, year = {2026}, url = {https://4ort.xyz/entity/-64821-2001-xj239}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (64821) 2001 XJ239 — https://4ort.xyz/entity/-64821-2001-xj239 (retrieved 2026-05-03)

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Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 6w ago · LiMrBot bot · 2026-05-12 view diff on Wikidata ↗
    Time of discovery or invention → +2001-12-15T00:00:00Z
    Wikidata description → asteroid
    Follows → (64820) 2001 XR238
    Provisional designation → 2001 XJ239
    + 23 other properties edited (see Wikidata diff for full list)
    "/* wbremoveclaims-remove:1| */ [[Property:P1096]]: 0.1258674334439454±0.0000000012534"
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