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(18355) 1990 RN9

minor planet
Place asteroid Q4541984
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(18355) 1990 RN9

Summary

(18355) 1990 RN9 is an asteroid[1]. (18355) 1990 RN9 ranks in the top 2% of asteroid entities by monthly Wikipedia readership (1 views/month).[2]

Key Facts

  • (18355) 1990 RN9 is credited with the discovery of Henry E. Holt[3].
  • (18355) 1990 RN9's instance of is recorded as asteroid[4].
  • (18355) 1990 RN9's site of astronomical discovery is recorded as Palomar Observatory[5].
  • (18355) 1990 RN9 followed (18354) 1990 RK5[6].
  • (18355) 1990 RN9 was followed by (18356) 1990 SF1[7].
  • (18355) 1990 RN9's minor planet group is recorded as asteroid belt[8].
  • (18355) 1990 RN9's parent astronomical body is recorded as Sun[9].
  • (18355) 1990 RN9's provisional designation is recorded as 1990 RN9[10].
  • (18355) 1990 RN9's time of discovery or invention is recorded as September 14, 1990[11].
  • (18355) 1990 RN9's orbital eccentricity is recorded as {'amount': '+0.25'}[12].
  • (18355) 1990 RN9's orbital eccentricity is recorded as {'amount': '+0.2477245'}[13].
  • (18355) 1990 RN9's orbital eccentricity is recorded as {'amount': '+0.2461412187503557'}[14].
  • (18355) 1990 RN9's absolute magnitude is recorded as {'amount': '+13.8'}[15].
  • (18355) 1990 RN9's absolute magnitude is recorded as {'amount': '+14.02'}[16].
  • (18355) 1990 RN9's orbital inclination is recorded as {'unit': 'Q28390', 'amount': '+10.90616'}[17].
  • (18355) 1990 RN9's orbital inclination is recorded as {'unit': 'Q28390', 'amount': '+10.91185694127319'}[18].
  • (18355) 1990 RN9's orbital period is recorded as {'unit': 'Q577', 'amount': '+4.31'}[19].
  • (18355) 1990 RN9's orbital period is recorded as {'unit': 'Q573', 'amount': '+1575.815152698887'}[20].
  • (18355) 1990 RN9's longitude of ascending node is recorded as {'unit': 'Q28390', 'amount': '+304.54019'}[21].
  • (18355) 1990 RN9's longitude of ascending node is recorded as {'unit': 'Q28390', 'amount': '+304.4473033493185'}[22].
  • (18355) 1990 RN9's semi-major axis of an orbit is recorded as {'unit': 'Q1811', 'amount': '+2.6487618'}[23].
  • (18355) 1990 RN9's semi-major axis of an orbit is recorded as {'unit': 'Q1811', 'amount': '+2.65015472494695'}[24].
  • (18355) 1990 RN9's apoapsis is recorded as {'unit': 'Q1811', 'amount': '+3.305'}[25].
  • (18355) 1990 RN9's apoapsis is recorded as {'unit': 'Q1811', 'amount': '+3.302467038822406'}[26].
  • (18355) 1990 RN9's periapsis is recorded as {'unit': 'Q1811', 'amount': '+1.9925985'}[27].

Body

Designation and Status

(18355) 1990 RN9's instance of is recorded as asteroid[4].

Why It Matters

(18355) 1990 RN9 ranks in the top 2% of asteroid entities by monthly Wikipedia readership (1 views/month).[2]

References

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

Direct Wikidata claims

  1. [4] ↑ . 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. [5] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . wikidata.org.
  6. [8] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  7. [9] ↑ . wikidata.org.
  8. [10] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  9. [11] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  10. [12] ↑ . wikidata.org.
  11. [13] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  12. [14] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  13. [15] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  14. [16] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  15. [17] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  16. [18] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  17. [19] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  18. [20] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  19. [21] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  20. [22] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  21. [23] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  22. [24] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  23. [25] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  24. [26] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  25. [27] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.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). (18355) 1990 RN9. Retrieved May 3, 2026, from https://4ort.xyz/entity/18355-1990-rn9
MLA “(18355) 1990 RN9.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/18355-1990-rn9.
BibTeX @misc{4ortxyz_18355-1990-rn9_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(18355) 1990 RN9}}, year = {2026}, url = {https://4ort.xyz/entity/18355-1990-rn9}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (18355) 1990 RN9 — https://4ort.xyz/entity/18355-1990-rn9 (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. 14d ago · KaleemBot bot · 2026-05-25 view diff on Wikidata ↗
    Orbital period → {'unit': 'Q577', 'amount': '+4.31'}, {'unit': 'Q573', 'amount': '+1575.815152698887'}
    Apoapsis → {'unit': 'Q1811', 'amount': '+3.305'}, {'unit': 'Q1811', 'amount': '+3.302467038822406'}
    Time of periapsis → {'unit': 'Q14267', 'amount': '+2460843.7498291917'}
    Orbital eccentricity → {'amount': '+0.25'}, {'amount': '+0.2477245'}, {'amount': '+0.2461412187503557'}
    + 21 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update:0| */ Added [[wikipedia:ur:(18355) 1990 آر این 9]]"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.