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(19181) 1991 SD1

minor planet
Asteroid Q4542081

Facts

24 properties

Identity

Instance of
asteroid
More facts +23
Follows
(19180) 1991 RK16[3]
Followed by
19182 Pitz[4]
Absolute magnitude
13.9, 13.97[12][13]
Albedo
0.248[32]
Apoapsis
2.885 au, 2.882764661417431 au[23][24]
Argument of periapsis
92.33296°, 91.6864884553428°[27][28]
Diameter
4.639 km[31]
Discoverer or inventor
Robert H. McNaught[1]
Epoch
November 21, 2025[33]
Longitude of ascending node
132.23194°, 132.1293216646757°[19][20]
Mean anomaly
292.87853°, 250.2165861023926°[29][30]
Minor planet group
asteroid belt[5]
Orbital eccentricity
0.1302164, 0.1282357568306443[10][11]
Orbital inclination
13.79788°, 13.80872532584493°[14][15]
Orbital period
4.08 year, 1,491.806248561617 day[16][17]
Parent astronomical body
Sun[6]
Periapsis
2.2198913 au, 2.227452142055415 au[25][26]
Provisional designation
1991 SD1, 1998 GN4[7][8]
Rotation period
5.12791 h[18]
Semi-major axis of an orbit
2.5522341 au, 2.555108401736423 au[21][22]
Site of astronomical discovery
Siding Spring Observatory[2]
Time of discovery or invention
September 30, 1991[9]
Time of periapsis
2,461,455.432174558 Julian day[34]
🏷️ Also known as
en (19181) 1991 SD1 ru 1991 SD1 ru 1998 GN4 zh 小行星19181
🔖 Identifiers · 4
Freebase ID
/m/0h64l9k
JPL Small-Body Database SPK-ID
20019181
Minor Planet Center body ID
19181
Wolfram Language entity code
Entity["MinorPlanet", "MinorPlanet19181Provisional1991SD1"]

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🔗 Connections
Discoverer or inventor 1
Robert H. McNaught
Epoch 1
November 21, 2025
Followed by 1
19182 Pitz
Followed by (predecessor) 1
19182 Pitz
Follows 1
(19180) 1991 RK16
Instance of 1
asteroid
Minor planet group 1
asteroid belt
Parent astronomical body 1
Sun
Preceded by (successor) 1
(19180) 1991 RK16
Site of astronomical discovery 1
Siding Spring Observatory
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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] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  8. [8] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  9. [9] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  10. [10] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  11. [11] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  12. [12] ↑ . minorplanetcenter.net. minorplanetcenter.net. 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] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  19. [19] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  20. [20] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  21. [21] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  22. [22] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  23. [23] ↑ . minorplanetcenter.net. minorplanetcenter.net. 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] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  32. [32] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. 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.

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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). (19181) 1991 SD1. Retrieved November 12, 2026, from https://4ort.xyz/entity/19181-1991-sd1
MLA “(19181) 1991 SD1.” 4ort.xyz Knowledge Graph, 4ort.xyz, 12 Nov. 2026, https://4ort.xyz/entity/19181-1991-sd1.
BibTeX @misc{4ortxyz_19181-1991-sd1_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(19181) 1991 SD1}}, year = {2026}, url = {https://4ort.xyz/entity/19181-1991-sd1}, note = {Accessed: 2026-11-12}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (19181) 1991 SD1 — https://4ort.xyz/entity/19181-1991-sd1 (retrieved 2026-11-12)

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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. 27w ago · Shuaib-bot bot · 2026-05-04 view diff on Wikidata ↗
    Orbital period → 4.08 year, 1,491.806249 day
    Argument of periapsis → 92.33296 degree, 91.686488 degree
    Mean anomaly → 292.87853 degree, 250.216586 degree
    Epoch → November 21, 2025
    + 18 other properties edited (see Wikidata diff for full list)
    "Changed the item"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.