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(25581) 1999 XD221

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(25581) 1999 XD221

Summary

(25581) 1999 XD221 is an asteroid[1].

Key Facts

  • (25581) 1999 XD221 is credited with the discovery of Lincoln Near-Earth Asteroid Research[2].
  • (25581) 1999 XD221's instance of is recorded as asteroid[3].
  • (25581) 1999 XD221's site of astronomical discovery is recorded as Experimental Test Site[4].
  • (25581) 1999 XD221's follows is recorded as 25580 Xuelai[5].
  • (25581) 1999 XD221's followed by is recorded as (25582) 1999 XG221[6].
  • (25581) 1999 XD221's minor planet group is recorded as asteroid belt[7].
  • (25581) 1999 XD221's parent astronomical body is recorded as Sun[8].
  • (25581) 1999 XD221's provisional designation is recorded as 1979 HH1[9].
  • (25581) 1999 XD221's provisional designation is recorded as 1998 VF28[10].
  • (25581) 1999 XD221's provisional designation is recorded as 1999 XD221[11].
  • (25581) 1999 XD221's time of discovery or invention is recorded as +1999-12-14T00:00:00Z[12].
  • (25581) 1999 XD221's JPL Small-Body Database SPK-ID is recorded as 20025581[13].
  • (25581) 1999 XD221's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.010'}[14].
  • (25581) 1999 XD221's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.0947557'}[15].
  • (25581) 1999 XD221's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.09166772081998897'}[16].
  • (25581) 1999 XD221's absolute magnitude is recorded as {'unit': '1', 'amount': '+13.2'}[17].
  • (25581) 1999 XD221's absolute magnitude is recorded as {'unit': '1', 'amount': '+13.24'}[18].
  • (25581) 1999 XD221's orbital inclination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+10.83466'}[19].
  • (25581) 1999 XD221's orbital inclination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+10.83234956563088'}[20].
  • (25581) 1999 XD221's orbital period is recorded as {'unit': 'http://www.wikidata.org/entity/Q577', 'amount': '+4.3'}[21].
  • (25581) 1999 XD221's orbital period is recorded as {'unit': 'http://www.wikidata.org/entity/Q573', 'amount': '+1572.88996499211'}[22].
  • (25581) 1999 XD221's longitude of ascending node is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+253.15869'}[23].
  • (25581) 1999 XD221's longitude of ascending node is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+253.0969708391442'}[24].
  • (25581) 1999 XD221's semi-major axis of an orbit is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.6447841'}[25].
  • (25581) 1999 XD221's semi-major axis of an orbit is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.646874052340467'}[26].

Body

Designation and Status

(25581) 1999 XD221'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 . wikidata.org.
  13. [14] ↑ . wikidata.org.
  14. [15] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  15. [16] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  16. [17] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  17. [18] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  18. [19] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  19. [20] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  20. [21] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  21. [22] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  22. [23] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  23. [24] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  24. [25] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  25. [26] ↑ . 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). (25581) 1999 XD221. Retrieved May 3, 2026, from https://4ort.xyz/entity/-25581-1999-xd221
MLA “(25581) 1999 XD221.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/-25581-1999-xd221.
BibTeX @misc{4ortxyz_-25581-1999-xd221_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(25581) 1999 XD221}}, year = {2026}, url = {https://4ort.xyz/entity/-25581-1999-xd221}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (25581) 1999 XD221 — https://4ort.xyz/entity/-25581-1999-xd221 (retrieved 2026-05-03)

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