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(99999) 1981 FP

asteroid
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Summary

(99999) 1981 FP is an asteroid[1]. (99999) 1981 FP ranks in the top 2% of asteroid entities by monthly Wikipedia readership (10 views/month).[2]

Key Facts

  • Discoverer or inventor: Harvard College Observatory[3]
  • Site of astronomical discovery: Oak Ridge Observatory[4]
  • Follows: (99998) 1981 ED48[5]
  • Followed by: 100000 Astronautica[6]
  • Minor planet group: asteroid belt[7]
  • Parent astronomical body: Sun[8]
  • Provisional designation: 1981 FP[9]
  • Time of discovery or invention: March 28, 1981[10]
  • Orbital eccentricity: 0.1428077451046574[11]
  • Absolute magnitude: 16.36[12]
  • Orbital inclination: 2.418754681545732 degree[13]
  • Orbital period: 1393.66394675732 day[14]
  • Longitude of ascending node: 181.2632098992221 degree[15]
  • Semi-major axis of an orbit: 2.441779400481525 astronomical unit[16]
  • Apoapsis: 2.790484410707294 astronomical unit[17]
  • Periapsis: 2.093074390255756 astronomical unit[18]
  • Argument of periapsis: 18.37504458105936 degree[19]
  • Mean anomaly: 233.6355452525119 degree[20]
  • Epoch: November 21, 2025[21]
  • Time of periapsis: 2461489.6932909256 Julian day[22]

Why It Matters

(99999) 1981 FP is known by 3 alternative names across languages and contexts.[23]

References

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

Direct Wikidata claims

  1. [3] ↑ . Retrieved . wikidata.org.
  2. [4] ↑ . wikidata.org.
  3. [5] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  6. [8] ↑ . wikidata.org.
  7. [9] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: 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] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  14. [16] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  15. [17] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  16. [18] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  17. [19] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  18. [20] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  19. [21] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  20. [22] ↑ . 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] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [23] ↑ . 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). (99999) 1981 FP. Retrieved October 20, 2026, from https://4ort.xyz/entity/-99999-1981-fp
MLA “(99999) 1981 FP.” 4ort.xyz Knowledge Graph, 4ort.xyz, 20 Oct. 2026, https://4ort.xyz/entity/-99999-1981-fp.
BibTeX @misc{4ortxyz_-99999-1981-fp_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(99999) 1981 FP}}, year = {2026}, url = {https://4ort.xyz/entity/-99999-1981-fp}, note = {Accessed: 2026-10-20}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (99999) 1981 FP — https://4ort.xyz/entity/-99999-1981-fp (retrieved 2026-10-20)

Canonical URL: https://4ort.xyz/entity/-99999-1981-fp · Last refreshed:

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. 18d ago · Porrima · 2026-10-05 view diff on Wikidata ↗
    Sitelink count → 5
    Wikipedia languages → ['en', 'es', 'fi', 'hu', 'ur']
    Discoverer or inventor → Harvard College Observatory
    Claims rich → —
    "/* wbsetclaim-create:2||1 */ Discoverer or inventor: Harvard College Observatory"
  2. 24w ago · Shuaib-bot bot · 2026-05-04 view diff on Wikidata ↗
    Time of discovery or invention → +1981-03-28T00:00:00Z
    Parent astronomical body → Sun
    Orbital inclination → {'unit': 'Q28390', 'amount': '+2.418754681545732'}
    Wikidata description → asteroid
    + 22 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update:0| */"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.