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21659 Fredholm

asteroid
Thing Asteroid Q147904

Facts

23 properties
Instance of
asteroid
Follows
(21658) 1999 PA2[5]
Followed by
21660 Velenia[6]
Absolute magnitude
14.6, 14.87[17][18]
Apoapsis
2.952 au, 2.952738216815101 au
Argument of periapsis
260.30744°, 260.9709259871343°
Discoverer or inventor
Paul G. Comba[2]
Epoch
November 21, 2025
Longitude of ascending node
46.80768°, 46.69495538324519°[23][24]
Mean anomaly
210.03932°, 157.8329292686057°
Minor planet group
asteroid belt[7]
Named after
Erik Ivar Fredholm[4]
Orbital eccentricity
0.15 (0.15–0.15, n=3)[14][15][16]
Orbital inclination
4.88713°, 4.875880163601495°[19][20]
Orbital period
4.13 year, 1,510.041692418338 day[21][22]
Parent astronomical body
Sun[8]
Periapsis
2.1926183 au, 2.199038159964205 au
Provisional designation
1995 UH26, 1998 HV43, 1999 PR3[9][10][11]
Semi-major axis of an orbit
2.5721655 au, 2.575888188389653 au[25]
Significant event
naming[13]
Site of astronomical discovery
Prescott Observatory[3]
Time of discovery or invention
August 13, 1999[12]
Time of periapsis
2,460,338.4602676886 Julian day
🏷️ Also known as
en Fredholm de (21659) Fredholm fa سیارک ۲۱۶۵۹ ru (21659) 1999 PR3 ru 1998 HV43 ru 1995 UH26 ru 1999 PR3 uk 21659 Фредгольм zh 小行星21659
🔖 Identifiers · 3
Freebase ID
/m/03y2b35
JPL Small-Body Database SPK-ID
20021659
Minor Planet Center body ID
21659

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Summary

21659 Fredholm is an asteroid[1].

References

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

Direct Wikidata claims

  1. [2] ↑ . Minor Planet Center 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] ↑ . Minor Planet Center database. 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] ↑ . wikidata.org.
  13. [14] ↑ . wikidata.org.
  14. [15] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  15. [16] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  16. [17] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  17. [18] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  18. [19] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  19. [20] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  20. [21] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  21. [22] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  22. [23] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  23. [24] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  24. [25] ↑ . minorplanetcenter.net. minorplanetcenter.net. 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). 21659 Fredholm. Retrieved November 11, 2026, from https://4ort.xyz/entity/21659-fredholm
MLA “21659 Fredholm.” 4ort.xyz Knowledge Graph, 4ort.xyz, 11 Nov. 2026, https://4ort.xyz/entity/21659-fredholm.
BibTeX @misc{4ortxyz_21659-fredholm_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{21659 Fredholm}}, year = {2026}, url = {https://4ort.xyz/entity/21659-fredholm}, note = {Accessed: 2026-11-11}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): 21659 Fredholm — https://4ort.xyz/entity/21659-fredholm (retrieved 2026-11-11)

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