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(42489) 1991 RL18

minor planet
Place asteroid Q4543378
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(42489) 1991 RL18

Summary

(42489) 1991 RL18 is an asteroid[1].

Key Facts

  • (42489) 1991 RL18 is credited with the discovery of Henry E. Holt[2].
  • (42489) 1991 RL18's instance of is recorded as asteroid[3].
  • (42489) 1991 RL18's site of astronomical discovery is recorded as Palomar Observatory[4].
  • (42489) 1991 RL18 followed (42488) 1991 RN17[5].
  • (42489) 1991 RL18 was followed by (42490) 1991 SU[6].
  • (42489) 1991 RL18's minor planet group is recorded as asteroid belt[7].
  • (42489) 1991 RL18's parent astronomical body is recorded as Sun[8].
  • (42489) 1991 RL18's provisional designation is recorded as 1991 RL18[9].
  • (42489) 1991 RL18's provisional designation is recorded as 1999 NL61[10].
  • (42489) 1991 RL18's provisional designation is recorded as 2002 JB17[11].
  • (42489) 1991 RL18's time of discovery or invention is recorded as September 13, 1991[12].
  • (42489) 1991 RL18's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.1839415498051016'}[13].
  • (42489) 1991 RL18's absolute magnitude is recorded as {'unit': '1', 'amount': '+14.62'}[14].
  • (42489) 1991 RL18's orbital inclination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+12.74650412320276'}[15].
  • (42489) 1991 RL18's orbital period is recorded as {'unit': 'http://www.wikidata.org/entity/Q573', 'amount': '+1530.76612238695'}[16].
  • (42489) 1991 RL18's longitude of ascending node is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+179.4897176473079'}[17].
  • (42489) 1991 RL18's semi-major axis of an orbit is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.599402966534634'}[18].
  • (42489) 1991 RL18's apoapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+3.077541176766993'}[19].
  • (42489) 1991 RL18's periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.121264756302275'}[20].
  • (42489) 1991 RL18's argument of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+223.5698273059114'}[21].
  • (42489) 1991 RL18's mean anomaly is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+21.1284805735786'}[22].
  • (42489) 1991 RL18's epoch is recorded as November 21, 2025[23].
  • (42489) 1991 RL18's time of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q14267', 'amount': '+2460910.658993668'}[24].

Body

Designation and Status

(42489) 1991 RL18'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). (42489) 1991 RL18. Retrieved May 3, 2026, from https://4ort.xyz/entity/-42489-1991-rl18
MLA “(42489) 1991 RL18.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/-42489-1991-rl18.
BibTeX @misc{4ortxyz_-42489-1991-rl18_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(42489) 1991 RL18}}, year = {2026}, url = {https://4ort.xyz/entity/-42489-1991-rl18}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (42489) 1991 RL18 — https://4ort.xyz/entity/-42489-1991-rl18 (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. 18d ago · KaleemBot bot · 2026-05-18 view diff on Wikidata ↗
    Absolute magnitude → {'unit': '1', 'amount': '+14.62'}
    Periapsis → {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '
    Time of discovery or invention → +1991-09-13T00:00:00Z
    Orbital inclination → {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount':
    + 23 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update:0| */ Added [[wikipedia:ur:(42489) 1991 آر ایل 18]]"
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