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(66957) 1999 XO21

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(66957) 1999 XO21

Summary

(66957) 1999 XO21 is an asteroid[1].

Key Facts

  • (66957) 1999 XO21 is credited with the discovery of Lincoln Near-Earth Asteroid Research[2].
  • (66957) 1999 XO21's instance of is recorded as asteroid[3].
  • (66957) 1999 XO21's site of astronomical discovery is recorded as Experimental Test Site[4].
  • (66957) 1999 XO21 followed (66956) 1999 XE21[5].
  • (66957) 1999 XO21 was followed by (66958) 1999 XO23[6].
  • (66957) 1999 XO21's minor planet group is recorded as asteroid belt[7].
  • (66957) 1999 XO21's parent astronomical body is recorded as Sun[8].
  • (66957) 1999 XO21's provisional designation is recorded as 2001 DT53[9].
  • (66957) 1999 XO21's provisional designation is recorded as 1999 XO21[10].
  • (66957) 1999 XO21's time of discovery or invention is recorded as December 5, 1999[11].
  • (66957) 1999 XO21's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.1448595706543854'}[12].
  • (66957) 1999 XO21's absolute magnitude is recorded as {'unit': '1', 'amount': '+15.26'}[13].
  • (66957) 1999 XO21's orbital inclination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+6.612506204170009'}[14].
  • (66957) 1999 XO21's orbital period is recorded as {'unit': 'http://www.wikidata.org/entity/Q573', 'amount': '+1660.222930815296'}[15].
  • (66957) 1999 XO21's longitude of ascending node is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+165.0144095156004'}[16].
  • (66957) 1999 XO21's semi-major axis of an orbit is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.743965546857841'}[17].
  • (66957) 1999 XO21's apoapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+3.141455217866094'}[18].
  • (66957) 1999 XO21's periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.346475875849589'}[19].
  • (66957) 1999 XO21's argument of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+199.7745422018282'}[20].
  • (66957) 1999 XO21's mean anomaly is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+214.5979871044435'}[21].
  • (66957) 1999 XO21's epoch is recorded as October 17, 2024[22].
  • (66957) 1999 XO21's time of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q14267', 'amount': '+2461271.0548777664'}[23].

Body

Designation and Status

(66957) 1999 XO21'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.

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). (66957) 1999 XO21. Retrieved May 3, 2026, from https://4ort.xyz/entity/-66957-1999-xo21
MLA “(66957) 1999 XO21.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/-66957-1999-xo21.
BibTeX @misc{4ortxyz_-66957-1999-xo21_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(66957) 1999 XO21}}, year = {2026}, url = {https://4ort.xyz/entity/-66957-1999-xo21}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (66957) 1999 XO21 — https://4ort.xyz/entity/-66957-1999-xo21 (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. 28d ago · LiMrBot bot · 2026-05-12 view diff on Wikidata ↗
    Imported from → —
    Jpl small-body database spk-id → 20066957
    Wikidata description → asteroid
    Follows → (66956) 1999 XE21
    + 20 other properties edited (see Wikidata diff for full list)
    "/* wbremoveclaims-remove:1| */ [[Property:P1457]]: 15.26"
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