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(399307) 1991 RJ2

asteroid
Place asteroid Q15040363
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(399307) 1991 RJ2

Summary

(399307) 1991 RJ2 is an asteroid[1].

Key Facts

  • (399307) 1991 RJ2 is credited with the discovery of Eleanor F. Helin[2].
  • (399307) 1991 RJ2's instance of is recorded as asteroid[3].
  • (399307) 1991 RJ2's instance of is recorded as near-Earth object[4].
  • (399307) 1991 RJ2's instance of is recorded as near-Earth asteroid[5].
  • (399307) 1991 RJ2's site of astronomical discovery is recorded as Palomar Observatory[6].
  • (399307) 1991 RJ2's minor planet group is recorded as Amor asteroid[7].
  • (399307) 1991 RJ2's parent astronomical body is recorded as Sun[8].
  • (399307) 1991 RJ2's provisional designation is recorded as 1991 RJ2[9].
  • (399307) 1991 RJ2's time of discovery or invention is recorded as September 8, 1991[10].
  • (399307) 1991 RJ2's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.4280928779945015'}[11].
  • (399307) 1991 RJ2's absolute magnitude is recorded as {'unit': '1', 'amount': '+18.86'}[12].
  • (399307) 1991 RJ2's orbital inclination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+8.95430323947156'}[13].
  • (399307) 1991 RJ2's orbital period is recorded as {'unit': 'http://www.wikidata.org/entity/Q573', 'amount': '+1199.824945789112'}[14].
  • (399307) 1991 RJ2's rotation period is recorded as {'unit': 'http://www.wikidata.org/entity/Q25235', 'amount': '+3.4807'}[15].
  • (399307) 1991 RJ2's longitude of ascending node is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+171.6435987754129'}[16].
  • (399307) 1991 RJ2's semi-major axis of an orbit is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.209766100509615'}[17].
  • (399307) 1991 RJ2's apoapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+3.155751230171462'}[18].
  • (399307) 1991 RJ2's periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+1.263780970847767'}[19].
  • (399307) 1991 RJ2's argument of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+151.1292797062337'}[20].
  • (399307) 1991 RJ2's mean anomaly is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+157.0656567325802'}[21].
  • (399307) 1991 RJ2's epoch is recorded as November 21, 2025[22].
  • (399307) 1991 RJ2's time of periapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q14267', 'amount': '+2460477.0241859043'}[23].

Body

Designation and Status

Recorded instance of include asteroid[3], near-Earth object[4], and near-Earth asteroid[5].

References

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

Direct Wikidata claims

  1. [3] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  2. [4] ↑ . 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. [2] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  5. [6] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  6. [7] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  7. [8] ↑ . 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.
  22. [23] ↑ . 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). (399307) 1991 RJ2. Retrieved October 7, 2026, from https://4ort.xyz/entity/-399307-1991-rj2
MLA “(399307) 1991 RJ2.” 4ort.xyz Knowledge Graph, 4ort.xyz, 7 Oct. 2026, https://4ort.xyz/entity/-399307-1991-rj2.
BibTeX @misc{4ortxyz_-399307-1991-rj2_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(399307) 1991 RJ2}}, year = {2026}, url = {https://4ort.xyz/entity/-399307-1991-rj2}, note = {Accessed: 2026-10-07}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (399307) 1991 RJ2 — https://4ort.xyz/entity/-399307-1991-rj2 (retrieved 2026-10-07)

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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. 20w ago · Peter James · 2026-05-15 view diff on Wikidata ↗
    Semi-major axis of an orbit → {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '
    Mean anomaly → {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount':
    Parent astronomical body → Sun
    Imported from → —
    + 22 other properties edited (see Wikidata diff for full list)
    "/* wbmergeitems-from:0||Q139781937 */ #quickstatements; #temporary_batch_1778887664546"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.