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(99981) 1981 EF20

asteroid
Place asteroid Q28518408

Facts

24 properties
Instance of
asteroid
Follows
(99980) 1981 ER18[4]
Followed by
(99982) 1981 EJ21[5]
Absolute magnitude
15.48[12]
Albedo
0.058[22]
Apoapsis
3.066405970385874 astronomical unit[17]
Argument of periapsis
13.56896157964258 degree[19]
Diameter
5.512 km[21]
Discoverer or inventor
Schelte J. Bus[2]
Epoch
November 21, 2025
Imported from
wholeness_audit_2026-05-02
Longitude of ascending node
167.3937453181757 degree[15]
Mean anomaly
308.9175920889903 degree[20]
Minor planet group
asteroid belt[6]
Orbital eccentricity
0.1198033964408478[11]
Orbital inclination
7.939498916972483 degree[13]
Orbital period
1,655.122848419732 day[14]
Parent astronomical body
Sun[7]
Periapsis
2.410280348180499 astronomical unit[18]
Provisional designation
2001 RL140, 1981 EF20[8][9]
Semi-major axis of an orbit
2.738343159283187 astronomical unit[16]
Site of astronomical discovery
Siding Spring Observatory[3]
Time of discovery or invention
March 2, 1981[10]
Time of periapsis
2,461,235.3546124604 Julian day
🏷️ Also known as
en (99981) 1981 EF20
🔖 Identifiers · 4
Google Knowledge Graph ID
/g/11c5_77vz7
JPL Small-Body Database SPK-ID
20099981
Minor Planet Center body ID
99981
Wolfram Language entity code
Entity["MinorPlanet", "MinorPlanet99981Provisional1981EF20"]

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Summary

(99981) 1981 EF20 is an asteroid[1].

References

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

Direct Wikidata claims

  1. [2] ↑ . 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. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: 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.

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). (99981) 1981 EF20. Retrieved October 2, 2026, from https://4ort.xyz/entity/-99981-1981-ef20
MLA “(99981) 1981 EF20.” 4ort.xyz Knowledge Graph, 4ort.xyz, 2 Oct. 2026, https://4ort.xyz/entity/-99981-1981-ef20.
BibTeX @misc{4ortxyz_-99981-1981-ef20_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(99981) 1981 EF20}}, year = {2026}, url = {https://4ort.xyz/entity/-99981-1981-ef20}, note = {Accessed: 2026-10-02}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (99981) 1981 EF20 — https://4ort.xyz/entity/-99981-1981-ef20 (retrieved 2026-10-02)

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