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(18640) 1998 EF9

main-belt minor planet
Place asteroid Q4542040
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(18640) 1998 EF9

Summary

(18640) 1998 EF9 is an asteroid[1]. (18640) 1998 EF9 is known by 3 alternative names across languages and contexts.[2]

Key Facts

  • (18640) 1998 EF9 is credited with the discovery of Beijing Schmidt CCD Asteroid Program[3].
  • (18640) 1998 EF9's instance of is recorded as asteroid[4].
  • (18640) 1998 EF9's site of astronomical discovery is recorded as Xinglong Station[5].
  • (18640) 1998 EF9 followed 18639 Aoyunzhiyuanzhe[6].
  • (18640) 1998 EF9 was followed by (18641) 1998 EG10[7].
  • (18640) 1998 EF9's minor planet group is recorded as asteroid belt[8].
  • (18640) 1998 EF9's parent astronomical body is recorded as Sun[9].
  • (18640) 1998 EF9's provisional designation is recorded as 1983 AT6[10].
  • (18640) 1998 EF9's provisional designation is recorded as 1998 EF9[11].
  • (18640) 1998 EF9's provisional designation is recorded as 1999 NL45[12].
  • (18640) 1998 EF9's time of discovery or invention is recorded as March 7, 1998[13].
  • (18640) 1998 EF9's orbital eccentricity is recorded as {'amount': '+0.30'}[14].
  • (18640) 1998 EF9's orbital eccentricity is recorded as {'amount': '+0.2955423'}[15].
  • (18640) 1998 EF9's orbital eccentricity is recorded as {'amount': '+0.2934809541485812'}[16].
  • (18640) 1998 EF9's absolute magnitude is recorded as {'amount': '+13.1'}[17].
  • (18640) 1998 EF9's absolute magnitude is recorded as {'amount': '+13.21'}[18].
  • (18640) 1998 EF9's orbital inclination is recorded as {'unit': 'Q28390', 'amount': '+20.37368'}[19].
  • (18640) 1998 EF9's orbital inclination is recorded as {'unit': 'Q28390', 'amount': '+20.38311324679317'}[20].
  • (18640) 1998 EF9's orbital period is recorded as {'unit': 'Q577', 'amount': '+3.79'}[21].
  • (18640) 1998 EF9's orbital period is recorded as {'unit': 'Q573', 'amount': '+1383.958277202233'}[22].
  • (18640) 1998 EF9's rotation period is recorded as {'unit': 'Q25235', 'amount': '+3.6303'}[23].
  • (18640) 1998 EF9's longitude of ascending node is recorded as {'unit': 'Q28390', 'amount': '+262.53354'}[24].
  • (18640) 1998 EF9's longitude of ascending node is recorded as {'unit': 'Q28390', 'amount': '+262.4382880333053'}[25].
  • (18640) 1998 EF9's semi-major axis of an orbit is recorded as {'unit': 'Q1811', 'amount': '+2.4288945'}[26].
  • (18640) 1998 EF9's semi-major axis of an orbit is recorded as {'unit': 'Q1811', 'amount': '+2.430429607087675'}[27].

Body

Designation and Status

(18640) 1998 EF9's instance of is recorded as asteroid[4].

Why It Matters

(18640) 1998 EF9 is known by 3 alternative names across languages and contexts.[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] ↑ . 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] ↑ . 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] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  22. [24] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  23. [25] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  24. [26] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  25. [27] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikidata aliases. wikidata.org.

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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). (18640) 1998 EF9. Retrieved May 3, 2026, from https://4ort.xyz/entity/18640-1998-ef9
MLA “(18640) 1998 EF9.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/18640-1998-ef9.
BibTeX @misc{4ortxyz_18640-1998-ef9_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(18640) 1998 EF9}}, year = {2026}, url = {https://4ort.xyz/entity/18640-1998-ef9}, note = {Accessed: 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. 19d ago · KaleemBot bot · 2026-05-17 view diff on Wikidata ↗
    Follows → 18639 Aoyunzhiyuanzhe
    Orbital period → {'unit': 'Q577', 'amount': '+3.79'}, {'unit': 'Q573', 'amount': '+1383.958277202233'}
    Mean anomaly → {'unit': 'Q28390', 'amount': '+65.50241'}, {'unit': 'Q28390', 'amount': '+74.69520552392854'}
    Aliases → —
    + 22 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update:0| */ Added [[wikipedia:ur:(18640) 1998 ای ایف 9]]"
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