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(71221) 1999 YL9

asteroid
Place asteroid Q15185779
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(71221) 1999 YL9

Summary

(71221) 1999 YL9 is an asteroid[1].

Key Facts

  • (71221) 1999 YL9's instance of is recorded as asteroid[2].
  • (71221) 1999 YL9's site of astronomical discovery is recorded as Pistoia Mountains Astronomical Observatory[3].
  • (71221) 1999 YL9 followed (71220) 1999 YY8[4].
  • (71221) 1999 YL9 was followed by (71222) 1999 YQ9[5].
  • (71221) 1999 YL9's minor planet group is recorded as asteroid belt[6].
  • (71221) 1999 YL9's parent astronomical body is recorded as Sun[7].
  • (71221) 1999 YL9's provisional designation is recorded as 1999 YL9[8].
  • (71221) 1999 YL9's time of discovery or invention is recorded as December 31, 1999[9].
  • (71221) 1999 YL9's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.1859337424687652'}[10].
  • (71221) 1999 YL9's absolute magnitude is recorded as {'unit': '1', 'amount': '+15.27'}[11].
  • (71221) 1999 YL9's orbital inclination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+7.102280715526041'}[12].
  • (71221) 1999 YL9's orbital period is recorded as {'unit': 'http://www.wikidata.org/entity/Q573', 'amount': '+1699.44770483768'}[13].
  • (71221) 1999 YL9's longitude of ascending node is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+305.1128064189617'}[14].
  • (71221) 1999 YL9's semi-major axis of an orbit is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.787016792579248'}[15].
  • (71221) 1999 YL9's apoapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+3.305217255146802'}[16].
  • (71221) 1999 YL9's periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.268816330011695'}[17].
  • (71221) 1999 YL9's argument of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+151.1953045622689'}[18].
  • (71221) 1999 YL9's mean anomaly is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+136.9397756096238'}[19].
  • (71221) 1999 YL9's diameter is recorded as {'unit': 'http://www.wikidata.org/entity/Q828224', 'amount': '+5.179'}[20].
  • (71221) 1999 YL9's albedo is recorded as {'unit': '1', 'amount': '+0.067'}[21].
  • (71221) 1999 YL9's epoch is recorded as October 17, 2024[22].
  • (71221) 1999 YL9's time of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q14267', 'amount': '+2459954.050035109'}[23].

Body

Designation and Status

(71221) 1999 YL9's instance of is recorded as asteroid[2].

References

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

Direct Wikidata claims

  1. [2] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  2. [3] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: 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). (71221) 1999 YL9. Retrieved May 3, 2026, from https://4ort.xyz/entity/-71221-1999-yl9
MLA “(71221) 1999 YL9.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/-71221-1999-yl9.
BibTeX @misc{4ortxyz_-71221-1999-yl9_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(71221) 1999 YL9}}, year = {2026}, url = {https://4ort.xyz/entity/-71221-1999-yl9}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (71221) 1999 YL9 — https://4ort.xyz/entity/-71221-1999-yl9 (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. 4w ago · LiMrBot bot · 2026-05-17 view diff on Wikidata ↗
    Diameter → {'unit': 'http://www.wikidata.org/entity/Q828224', 'amount':
    Parent astronomical body → Sun
    Site of astronomical discovery → Pistoia Mountains Astronomical Observatory
    Imported from → —
    + 23 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-create:2||1 */ [[Property:P61]]: [[Q291685]], from JPL"
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