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(5550) 1981 UB1

main-belt minor planet
Place Asteroid Q709250

Facts

23 properties

Identity

Instance of
asteroid
More facts +22
Follows
5549 Bobstefanik[3]
Followed by
5551 Glikson[4]
Absolute magnitude
+12.2, +12.35[16][17]
Albedo
+0.083[35]
Apoapsis
+3.644, +3.650640310145401[26][27]
Argument of periapsis
+285.04067, +284.981824007518[30][31]
Diameter
+18.32[34]
Discoverer or inventor
Laurence G. Taff[1]
Epoch
November 21, 2025[36]
Longitude of ascending node
+145.77040, +145.7719862979473[22][23]
Mean anomaly
+290.12057, +5.802818449168904[32][33]
Minor planet group
asteroid belt[5]
Orbital eccentricity
+0.1796308, +0.1818878084217454[14][15]
Orbital inclination
+1.11417, +1.114695851914165[18][19]
Orbital period
+5.43, +1982.839743138492[20][21]
Parent astronomical body
Sun[6]
Periapsis
+2.5343157, +2.527002413862976[28][29]
Provisional designation
1981 UB1, 1975 RQ2, 1977 AM, 1981 SP5, 1983 CP2, 1986 WD8[7][8][9][10][11][12]
Semi-major axis of an orbit
+3.0892379, +3.088821362004189[24][25]
Site of astronomical discovery
Experimental Test Site[2]
Time of discovery or invention
October 30, 1981[13]
Time of periapsis
+2460968.5387248797[37]
🏷️ Also known as
en (5550) 1981 UB1 ru 1975 RQ2 ru 1977 AM ru 1981 SP5 ru 1981 UB1 ru 1983 CP2 ru 1986 WD8 uk 5550 1981 UB1 zh 小行星5550
🔖 Identifiers · 4
Freebase ID
/m/0b749lj
JPL Small-Body Database SPK-ID
20005550
Minor Planet Center body ID
5550
Wolfram Language entity code
Entity["MinorPlanet", "MinorPlanet5550Provisional1981UB1"]

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

🔗 Connections
Discoverer or inventor 1
Laurence G. Taff
Epoch 1
November 21, 2025
Followed by 1
5551 Glikson
Followed by (predecessor) 1
5551 Glikson
Follows 1
5549 Bobstefanik
Instance of 1
asteroid
Minor planet group 1
asteroid belt
Parent astronomical body 1
Sun
Preceded by (successor) 1
5549 Bobstefanik
← FactGrid item ID 1
Halahanivka
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References

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

Direct Wikidata claims

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

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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). (5550) 1981 UB1. Retrieved November 9, 2026, from https://4ort.xyz/entity/5550-1981-ub1
MLA “(5550) 1981 UB1.” 4ort.xyz Knowledge Graph, 4ort.xyz, 9 Nov. 2026, https://4ort.xyz/entity/5550-1981-ub1.
BibTeX @misc{4ortxyz_5550-1981-ub1_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(5550) 1981 UB1}}, year = {2026}, url = {https://4ort.xyz/entity/5550-1981-ub1}, note = {Accessed: 2026-11-09}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (5550) 1981 UB1 — https://4ort.xyz/entity/5550-1981-ub1 (retrieved 2026-11-09)

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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. 11d ago · AbzalM · 2026-10-31 view diff on Wikidata ↗
    Periapsis → 2.534316 astronomical unit, 2.527002 astronomical unit
    Orbital period → 5.43 year, 1,982.839743 day
    Instance of → asteroid
    Discoverer or inventor → Laurence G. Taff
    + 17 other properties edited (see Wikidata diff for full list)
    "Changed [kaa] labels, descriptions, aliases and claims: kaawiki sitelink"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.