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(99987) 1981 EC31

asteroid
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Summary

(99987) 1981 EC31 is an asteroid[1].

Key Facts

  • Discoverer or inventor: Schelte J. Bus[2]
  • Site of astronomical discovery: Siding Spring Observatory[3]
  • Follows: (99986) 1981 ET28[4]
  • Followed by: (99988) 1981 ET33[5]
  • Minor planet group: asteroid belt[6]
  • Parent astronomical body: Sun[7]
  • Provisional designation: 1994 CK20[8], 1981 EC31[9]
  • Time of discovery or invention: March 2, 1981[10]
  • Orbital eccentricity: 0.1144212726112429[11]
  • Absolute magnitude: 15.72[12]
  • Orbital inclination: 13.48928219066154 degree[13]
  • Orbital period: 1598.58958546996 day[14]
  • Longitude of ascending node: 355.8651325190202 degree[15]
  • Semi-major axis of an orbit: 2.675627812030313 astronomical unit[16]
  • Apoapsis: 2.981776551316856 astronomical unit[17]
  • Periapsis: 2.369479072743769 astronomical unit[18]
  • Argument of periapsis: 116.6799746768741 degree[19]
  • Mean anomaly: 132.2953543549856 degree[20]
  • Epoch: November 21, 2025[21]

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.

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). (99987) 1981 EC31. Retrieved October 30, 2026, from https://4ort.xyz/entity/-99987-1981-ec31
MLA “(99987) 1981 EC31.” 4ort.xyz Knowledge Graph, 4ort.xyz, 30 Oct. 2026, https://4ort.xyz/entity/-99987-1981-ec31.
BibTeX @misc{4ortxyz_-99987-1981-ec31_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(99987) 1981 EC31}}, year = {2026}, url = {https://4ort.xyz/entity/-99987-1981-ec31}, note = {Accessed: 2026-10-30}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (99987) 1981 EC31 — https://4ort.xyz/entity/-99987-1981-ec31 (retrieved 2026-10-30)

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