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9971 Ishihara

asteroid
Place asteroid Q764808

Facts

25 properties
Instance of
asteroid
Follows
(9970) 1992 ST1[4]
Followed by
9972 Minoruoda[5]
Absolute magnitude
+13.8, +13.97[16][17]
Albedo
+0.233[37]
Apoapsis
+2.448, +2.448211006562152[28][29]
Argument of periapsis
+245.93191, +246.3478181684848[32][33]
Diameter
+5.012[36]
Discoverer or inventor
Kin Endate, Kazurō Watanabe[1][2]
Epoch
November 21, 2025[38]
Longitude of ascending node
+20.53965, +20.46256286929641[24][25]
Mean anomaly
+342.35415, +356.1298956379823[34][35]
Minor planet group
asteroid belt[6]
Orbital eccentricity
0.12 (0.12–0.12, n=3)[13][14][15]
Orbital inclination
2.74 (2.74–2.75, n=3)[18][19][20]
Orbital period
+3.22, +1176.666163942323[21][22]
Parent astronomical body
Sun[7]
Periapsis
+1.9157727, +1.914266705536503[30][31]
Provisional designation
1991 YC2, 1993 HS, 1996 EU1[8][9][10]
Rotation period
+6.715[23]
Semi-major axis of an orbit
+2.1816572, +2.181238856049328[26][27]
Significant event
naming[12]
Site of astronomical discovery
Kitami Observatory[3]
Time of discovery or invention
April 16, 1993[11]
Show all 25 facts +1
Time of periapsis
+2461013.1495023714[39]
🏷️ Also known as
en 9971 Ishihara en Ishihara de (9971) Ishihara fa سیارک ۹۹۷۱ ja 9971 いしはら ja 9971 石原 ru Ishihara ru Исихара ru 1996 EU1 ru 1991 YC2 ru 1993 HS ru (9971) 1993 HS ru (9971) Ishihara ru (9971) Исихара uk 9971 Ісіхара zh 小行星9971
🔖 Identifiers · 5
Image (Wikimedia Commons)
AnimatedOrbitOf9971Ishihara.gif ↗
DAMIT asteroid ID
950
Freebase ID
/m/03hhfbx
JPL Small-Body Database SPK-ID
20009971
Minor Planet Center body ID
9971

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

🔗 Connections
Discoverer or inventor 2
Kazurō Watanabe, Kin Endate
Epoch 1
November 21, 2025
Followed by 1
9972 Minoruoda
Followed by (predecessor) 1
9972 Minoruoda
Follows 1
(9970) 1992 ST1
Instance of 1
asteroid
Minor planet group 1
asteroid belt
Parent astronomical body 1
Sun
Preceded by (successor) 1
(9970) 1992 ST1
Site of astronomical discovery 1
Kitami Observatory
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References

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

Direct Wikidata claims

  1. [1] ↑ . Minor Planet Center database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  2. [2] ↑ . Minor Planet Center database. Retrieved . ssd.jpl.nasa.gov. Provenance: 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] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  7. [7] ↑ . 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] ↑ . 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] ↑ . wikidata.org.
  13. [13] ↑ . 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] ↑ . 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] ↑ . 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] ↑ . minorplanetcenter.net. minorplanetcenter.net. 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.
  38. [38] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: 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). 9971 Ishihara. Retrieved November 2, 2026, from https://4ort.xyz/entity/9971-ishihara
MLA “9971 Ishihara.” 4ort.xyz Knowledge Graph, 4ort.xyz, 2 Nov. 2026, https://4ort.xyz/entity/9971-ishihara.
BibTeX @misc{4ortxyz_9971-ishihara_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{9971 Ishihara}}, year = {2026}, url = {https://4ort.xyz/entity/9971-ishihara}, note = {Accessed: 2026-11-02}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): 9971 Ishihara — https://4ort.xyz/entity/9971-ishihara (retrieved 2026-11-02)

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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. 1d ago · AbzalM · 2026-11-02 view diff on Wikidata ↗
    Orbital inclination → {'unit': 'Q28390', 'amount': '+2.74863'}, {'unit': 'Q28390', 'amount': '+2.74766'}, {'unit': 'Q28390', 'amount': '+2.744057948072149'}
    Apoapsis → {'unit': 'Q1811', 'amount': '+2.448'}, {'unit': 'Q1811', 'amount': '+2.448211006562152'}
    Discoverer or inventor → Kin Endate, Kazurō Watanabe
    Site of astronomical discovery → Kitami Observatory
    + 25 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update-languages-and-other-short:0||kaa */ kaawiki sitelink"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.