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5261 Eureka

Mars trojan asteroid
Place asteroid Q155190

Facts

28 properties

Identity

Instance of
asteroid
More facts +27
Follows
5260 Philvéron[5]
Followed by
5262 Brucegoldberg[6]
Absolute magnitude
+16.1[18]
Albedo
+0.39, +0.182[38][39]
Apoapsis
+1.622, +1.622324024111949[29][30]
Argument of periapsis
+95.48507, +95.54274760031726[33][34]
Asteroid spectral type
S-type asteroid[12]
Diameter
+1.878[37]
Discoverer or inventor
David H. Levy, Henry E. Holt[1][2]
Epoch
November 21, 2025
Lagrangian point
L5-Mars-Sun[17]
Longitude of ascending node
+245.04380, +245.0131768515497[25][26]
Mean anomaly
+204.56674, +232.030112742215[35][36]
Minor planet group
Mars-crossing asteroid, Mars trojan[7][8]
Named after
Eureka[4]
Orbital eccentricity
0.06 (0.06–0.07, n=3)[14][15][16]
Orbital inclination
20.3 (20.3–20.3, n=3)[19][20][21]
Orbital period
+1.88, +686.8434787518037[22][23]
Parent astronomical body
Sun[9]
Periapsis
+1.4247921, +1.424655697335888[31][32]
Provisional designation
1990 MB[10]
Rotation period
+2.6902[24]
Semi-major axis of an orbit
+1.5235306, +1.523489860723918[27][28]
Significant event
naming[13]
Site of astronomical discovery
Palomar Observatory[3]
Time of discovery or invention
June 20, 1990[11]
Time of periapsis
+2461244.65356261
🏷️ Also known as
en Eureka en 5261 Eureka ar ٥٢٦١ يوريكا ar 5261 يوريكا de (5261) Eureka de 1990 MB fa سیارک ۵۲۶۱ fr (5261) Eurêka ja エウレカ (小惑星) ja エウレカ ru 1990 MB ru (5261) 1990 MB ru (5261) Eureka ru (5261) Эврика ru Eureka ru Эврика sv 1990 MB uk (5261) Еврика zh 小行星5261
🔖 Identifiers · 5
Freebase ID
/m/03jq2m
JPL Small-Body Database SPK-ID
20005261
Minor Planet Center body ID
5261
SpaceReference.org celestial object ID
asteroid/5261-eureka-1990-mb
Wolfram Language entity code
Entity["MinorPlanet", "Eureka"]

Report an error or request removal Lineage (PROV-JSON)

🔗 Connections
Discoverer or inventor 2
David H. Levy, Henry E. Holt
Minor planet group 2
Mars-crossing asteroid, Mars trojan
Asteroid spectral type 1
S-type asteroid
Epoch 1
November 21, 2025
Followed by 1
5262 Brucegoldberg
Followed by (predecessor) 1
5262 Brucegoldberg
Follows 1
5260 Philvéron
Instance of 1
asteroid
Named after 1
Eureka
Parent astronomical body 1
Sun
Preceded by (successor) 1
5260 Philvéron
Site of astronomical discovery 1
Palomar Observatory
← SNARC ID 1
Côr Ysgol Rhydywaun
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Related Entities

Côr Ysgol Rhydywaun

References

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

Direct Wikidata claims

  1. [1] ↑ . Minor Planet Center database. wikidata.org.
  2. [2] ↑ . Minor Planet Center database. wikidata.org.
  3. [3] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  4. [4] ↑ . wikidata.org.
  5. [5] ↑ . Minor Planet Center database. wikidata.org.
  6. [6] ↑ . Minor Planet Center database. wikidata.org.
  7. [7] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  8. [8] ↑ . wikidata.org.
  9. [9] ↑ . wikidata.org.
  10. [10] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  11. [11] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  12. [12] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  13. [13] ↑ . wikidata.org.
  14. [14] ↑ . wikidata.org.
  15. [15] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  16. [16] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  17. [17] ↑ . wikidata.org.
  18. [18] ↑ . JPL Small-Body Database. Retrieved . minorplanetcenter.net. Provenance: wikidata.org.
  19. [19] ↑ . wikidata.org.
  20. [20] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  21. [21] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  22. [22] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  23. [23] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  24. [24] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  25. [25] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  26. [26] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  27. [27] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  28. [28] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  29. [29] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  30. [30] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  31. [31] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  32. [32] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  33. [33] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  34. [34] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  35. [35] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  36. [36] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  37. [37] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  38. [38] ↑ . wikidata.org.
  39. [39] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.

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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). 5261 Eureka. Retrieved November 4, 2026, from https://4ort.xyz/entity/5261-eureka
MLA “5261 Eureka.” 4ort.xyz Knowledge Graph, 4ort.xyz, 4 Nov. 2026, https://4ort.xyz/entity/5261-eureka.
BibTeX @misc{4ortxyz_5261-eureka_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{5261 Eureka}}, year = {2026}, url = {https://4ort.xyz/entity/5261-eureka}, note = {Accessed: 2026-11-04}}
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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. 5d ago · AbzalM · 2026-10-31 view diff on Wikidata ↗
    Wikipedia languages → ['als', 'ar', 'arz', 'ca', 'ce', 'commons', 'de', 'en', 'eo', 'es', 'fa', 'fi',
    Sitelink count → 36
    "/* wbeditentity-update-languages-and-other-short:0||kaa */ kaawiki sitelink"
  2. 11w ago · ~2026-44212-38 · 2026-08-18 view diff on Wikidata ↗
    Argument of periapsis → {'unit': 'Q28390', 'amount': '+95.48507'}, {'unit': 'Q28390', 'amount': '+95.54274760031726'}
    Followed by → 5262 Brucegoldberg
    Mean anomaly → {'unit': 'Q28390', 'amount': '+204.56674'}, {'unit': 'Q28390', 'amount': '+232.030112742215'}
    Named after → —
    + 29 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-create:2||1 */ Astronomic symbol image: Eureka symbol (fixed width).svg"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.