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(99980) 1981 ER18

asteroid
Place asteroid Q28518390

Facts

23 properties
Instance of
asteroid
Follows
(99979) 1981 EE16[4]
Followed by
(99981) 1981 EF20[5]
Absolute magnitude
15.41[11]
Apoapsis
2.988797076235498 astronomical unit[17]
Argument of periapsis
130.1241801947062 degree[19]
Discoverer or inventor
Schelte J. Bus[2]
Epoch
November 21, 2025[21]
Imported from
wholeness_audit_2026-05-02
Longitude of ascending node
344.5813823618335 degree[15]
Mean anomaly
13.60724759572915 degree[20]
Minor planet group
asteroid belt[6]
Orbital eccentricity
0.1681752708759419[10]
Orbital inclination
5.05779383912927 degree[12]
Orbital period
1,494.793011684297 day[13]
Parent astronomical body
Sun[7]
Periapsis
2.12823827068532 astronomical unit[18]
Provisional designation
1981 ER18[8]
Rotation period
2.35 hour[14]
Semi-major axis of an orbit
2.558517673460409 astronomical unit[16]
Site of astronomical discovery
Siding Spring Observatory[3]
Time of discovery or invention
March 2, 1981[9]
Time of periapsis
2,460,943.9999482934 Julian day
🏷️ Also known as
en (99980) 1981 ER18
🔖 Identifiers · 4
Google Knowledge Graph ID
/g/11c2nhntl8
JPL Small-Body Database SPK-ID
20099980
Minor Planet Center body ID
99980
Wolfram Language entity code
Entity["MinorPlanet", "MinorPlanet99980Provisional1981ER18"]

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Summary

(99980) 1981 ER18 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.

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). (99980) 1981 ER18. Retrieved October 28, 2026, from https://4ort.xyz/entity/-99980-1981-er18
MLA “(99980) 1981 ER18.” 4ort.xyz Knowledge Graph, 4ort.xyz, 28 Oct. 2026, https://4ort.xyz/entity/-99980-1981-er18.
BibTeX @misc{4ortxyz_-99980-1981-er18_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(99980) 1981 ER18}}, year = {2026}, url = {https://4ort.xyz/entity/-99980-1981-er18}, note = {Accessed: 2026-10-28}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (99980) 1981 ER18 — https://4ort.xyz/entity/-99980-1981-er18 (retrieved 2026-10-28)

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