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(189493) 1999 XL257

asteroid
Place asteroid Q8221997
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Summary

(189493) 1999 XL257 is an asteroid[1].

Key Facts

  • (189493) 1999 XL257 is credited with the discovery of Lincoln Near-Earth Asteroid Research[2].
  • (189493) 1999 XL257's instance of is recorded as asteroid[3].
  • (189493) 1999 XL257's site of astronomical discovery is recorded as Experimental Test Site[4].
  • (189493) 1999 XL257's follows is recorded as (189492) 1999 XZ253[5].
  • (189493) 1999 XL257's followed by is recorded as (189494) 1999 YY3[6].
  • (189493) 1999 XL257's minor planet group is recorded as Jupiter trojan[7].
  • (189493) 1999 XL257's minor planet group is recorded as Greek camp trojan asteroid[8].
  • (189493) 1999 XL257's parent astronomical body is recorded as Sun[9].
  • (189493) 1999 XL257's provisional designation is recorded as 1999 XL257[10].
  • (189493) 1999 XL257's provisional designation is recorded as 2001 AB5[11].
  • (189493) 1999 XL257's time of discovery or invention is recorded as +1999-12-07T00:00:00Z[12].
  • (189493) 1999 XL257's JPL Small-Body Database SPK-ID is recorded as 20189493[13].
  • (189493) 1999 XL257's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.08820387704212732'}[14].
  • (189493) 1999 XL257's Lagrangian point is recorded as L4-Jupiter-Sun[15].
  • (189493) 1999 XL257's absolute magnitude is recorded as {'unit': '1', 'amount': '+12.12'}[16].
  • (189493) 1999 XL257's orbital inclination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+11.52144284685518'}[17].
  • (189493) 1999 XL257's orbital period is recorded as {'unit': 'http://www.wikidata.org/entity/Q573', 'amount': '+4321.840404668493'}[18].
  • (189493) 1999 XL257's longitude of ascending node is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+281.1935640278739'}[19].
  • (189493) 1999 XL257's semi-major axis of an orbit is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+5.192544163859234'}[20].
  • (189493) 1999 XL257's apoapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+5.650546690824091'}[21].
  • (189493) 1999 XL257's periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+4.734541636894379'}[22].
  • (189493) 1999 XL257's argument of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+182.4972233102316'}[23].
  • (189493) 1999 XL257's mean anomaly is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+28.50650479523208'}[24].
  • (189493) 1999 XL257's Google Knowledge Graph ID is recorded as /g/1hhzgwrbz[25].
  • (189493) 1999 XL257's Minor Planet Center body ID is recorded as 189493[26].

Body

Designation and Status

(189493) 1999 XL257'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] ↑ . minorplanetcenter.org. minorplanetcenter.org. Provenance: wikidata.org.
  8. [9] ↑ . 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] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  14. [15] ↑ . 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.
  24. [25] ↑ . wikidata.org.
  25. [26] ↑ . 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). (189493) 1999 XL257. Retrieved May 3, 2026, from https://4ort.xyz/entity/-189493-1999-xl257
MLA “(189493) 1999 XL257.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/-189493-1999-xl257.
BibTeX @misc{4ortxyz_-189493-1999-xl257_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(189493) 1999 XL257}}, year = {2026}, url = {https://4ort.xyz/entity/-189493-1999-xl257}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (189493) 1999 XL257 — https://4ort.xyz/entity/-189493-1999-xl257 (retrieved 2026-05-03)

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