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(21045) 1990 SQ1

minor planet
Place asteroid Q4542197
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(21045) 1990 SQ1

Summary

(21045) 1990 SQ1 is an asteroid[1]. (21045) 1990 SQ1 has Wikipedia articles in 5 language editions, a strong signal of global cultural recognition.[2]

Key Facts

  • (21045) 1990 SQ1 is credited with the discovery of Henry E. Holt[3].
  • (21045) 1990 SQ1's instance of is recorded as asteroid[4].
  • (21045) 1990 SQ1's site of astronomical discovery is recorded as Palomar Observatory[5].
  • (21045) 1990 SQ1 followed (21044) 1990 SE1[6].
  • (21045) 1990 SQ1 was followed by (21046) 1990 SH3[7].
  • (21045) 1990 SQ1's minor planet group is recorded as asteroid belt[8].
  • (21045) 1990 SQ1's parent astronomical body is recorded as Sun[9].
  • (21045) 1990 SQ1's provisional designation is recorded as 1990 QC18[10].
  • (21045) 1990 SQ1's provisional designation is recorded as 1990 RE17[11].
  • (21045) 1990 SQ1's provisional designation is recorded as 1990 SQ1[12].
  • (21045) 1990 SQ1's provisional designation is recorded as 1999 XN114[13].
  • (21045) 1990 SQ1's time of discovery or invention is recorded as September 18, 1990[14].
  • (21045) 1990 SQ1's orbital eccentricity is recorded as {'amount': '+0.20'}[15].
  • (21045) 1990 SQ1's orbital eccentricity is recorded as {'amount': '+0.1963952'}[16].
  • (21045) 1990 SQ1's orbital eccentricity is recorded as {'amount': '+0.194708022152517'}[17].
  • (21045) 1990 SQ1's absolute magnitude is recorded as {'amount': '+13.9'}[18].
  • (21045) 1990 SQ1's absolute magnitude is recorded as {'amount': '+14.08'}[19].
  • (21045) 1990 SQ1's orbital inclination is recorded as {'unit': 'Q28390', 'amount': '+11.74793'}[20].
  • (21045) 1990 SQ1's orbital inclination is recorded as {'unit': 'Q28390', 'amount': '+11.74889255911538'}[21].
  • (21045) 1990 SQ1's orbital period is recorded as {'unit': 'Q577', 'amount': '+4.36'}[22].
  • (21045) 1990 SQ1's orbital period is recorded as {'unit': 'Q573', 'amount': '+1594.035310074707'}[23].
  • (21045) 1990 SQ1's rotation period is recorded as {'unit': 'Q25235', 'amount': '+10.06609'}[24].
  • (21045) 1990 SQ1's longitude of ascending node is recorded as {'unit': 'Q28390', 'amount': '+344.32093'}[25].
  • (21045) 1990 SQ1's longitude of ascending node is recorded as {'unit': 'Q28390', 'amount': '+344.2408885615104'}[26].
  • (21045) 1990 SQ1's semi-major axis of an orbit is recorded as {'unit': 'Q1811', 'amount': '+2.6694352'}[27].

Body

Designation and Status

(21045) 1990 SQ1's instance of is recorded as asteroid[4].

Why It Matters

(21045) 1990 SQ1 has Wikipedia articles in 5 language editions, a strong signal of global cultural recognition.[2] (21045) 1990 SQ1 is known by 4 alternative names across languages and contexts.[28]

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] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  11. [13] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  12. [14] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  13. [15] ↑ . wikidata.org.
  14. [16] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  15. [17] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  16. [18] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  17. [19] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  18. [20] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  19. [21] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  20. [22] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  21. [23] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. 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] ↑ . Wikidata sitelinks. wikidata.org.
  2. [28] ↑ . Wikidata aliases. 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). (21045) 1990 SQ1. Retrieved May 3, 2026, from https://4ort.xyz/entity/21045-1990-sq1
MLA “(21045) 1990 SQ1.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/21045-1990-sq1.
BibTeX @misc{4ortxyz_21045-1990-sq1_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(21045) 1990 SQ1}}, year = {2026}, url = {https://4ort.xyz/entity/21045-1990-sq1}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (21045) 1990 SQ1 — https://4ort.xyz/entity/21045-1990-sq1 (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. 15d ago · KaleemBot bot · 2026-05-18 view diff on Wikidata ↗
    Mean anomaly → {'unit': 'Q28390', 'amount': '+114.76901'}, {'unit': 'Q28390', 'amount': '+27.2525304733153'}
    Instance of → —
    Orbital eccentricity → {'amount': '+0.20'}, {'amount': '+0.1963952'}, {'amount': '+0.194708022152517'}
    Aliases → —
    + 22 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update:0| */ Added [[wikipedia:ur:(21045) 1990 ایس کیو 1]]"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.