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(7990) 1981 SN1

asteroid
Place Asteroid Q1312688

Facts

23 properties

Identity

Instance of
asteroid
More facts +22
Follows
7989 Pernadavide[4]
Followed by
7991 Kaguyahime[5]
Absolute magnitude
+13.9, +14.04[14][15]
Albedo
+0.123
Apoapsis
+4.010, +4.011932869899391
Argument of periapsis
+231.10858, +231.0688634875997
Diameter
+8.671
Discoverer or inventor
Norman G. Thomas[2]
Epoch
November 21, 2025
Longitude of ascending node
+144.93027, +144.8700933700383[20][21]
Mean anomaly
+11.75236, +95.5818052133765
Minor planet group
asteroid belt[6]
Orbital eccentricity
0.32 (0.31–0.32, n=3)[11][12][13]
Orbital inclination
+2.34288, +2.3463678160746[16][17]
Orbital period
+5.33, +1943.945040610326[18][19]
Parent astronomical body
Sun[7]
Periapsis
+2.0945671, +2.084657737360462
Provisional designation
1981 SN1, 1988 DL2[8][9]
Semi-major axis of an orbit
+3.0523404, +3.048295303629926[22][23]
Site of astronomical discovery
Anderson Mesa Station[3]
Time of discovery or invention
September 26, 1981[10]
Time of periapsis
+2460484.372843841
🏷️ Also known as
en (7990) 1981 SN1 ru 1981 SN1 ru 1988 DL2 zh 小行星7990
🔖 Identifiers · 4
Freebase ID
/m/0b758j4
JPL Small-Body Database SPK-ID
20007990
Minor Planet Center body ID
7990
Wolfram Language entity code
Entity["MinorPlanet", "MinorPlanet7990Provisional1981SN1"]

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🔗 Connections
Discoverer or inventor 1
Norman G. Thomas
Epoch 1
November 21, 2025
Followed by 1
7991 Kaguyahime
Followed by (predecessor) 1
7991 Kaguyahime
Follows 1
7989 Pernadavide
Instance of 1
asteroid
Minor planet group 1
asteroid belt
Parent astronomical body 1
Sun
Preceded by (successor) 1
7989 Pernadavide
Site of astronomical discovery 1
Anderson Mesa Station
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Summary

(7990) 1981 SN1 is an asteroid[1].

References

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

Direct Wikidata claims

  1. [2] ↑ . JPL Small-Body 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] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . Minor Planet Center database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  8. [9] ↑ . Minor Planet Center 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] ↑ . wikidata.org.
  11. [12] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  12. [13] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  13. [14] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  14. [15] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  15. [16] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  16. [17] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  17. [18] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  18. [19] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  19. [20] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  20. [21] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  21. [22] ↑ . minorplanetcenter.net. minorplanetcenter.net. 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). (7990) 1981 SN1. Retrieved November 8, 2026, from https://4ort.xyz/entity/7990-1981-sn1
MLA “(7990) 1981 SN1.” 4ort.xyz Knowledge Graph, 4ort.xyz, 8 Nov. 2026, https://4ort.xyz/entity/7990-1981-sn1.
BibTeX @misc{4ortxyz_7990-1981-sn1_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(7990) 1981 SN1}}, year = {2026}, url = {https://4ort.xyz/entity/7990-1981-sn1}, note = {Accessed: 2026-11-08}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (7990) 1981 SN1 — https://4ort.xyz/entity/7990-1981-sn1 (retrieved 2026-11-08)

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