Hiroki Kosai

Japanese astronomer
Person human Q519743
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Hiroki Kosai

Summary

Hiroki Kosai is a human[1]. Born in Kurashiki[2], he… he was born on +1933-02-08T00:00:00Z[3]. He worked as an astronomer[4]. He ranks in the top 0.73% of human entities by monthly Wikipedia readership (6 views/month, #7,295 of 1,000,298).[5]

Key Facts

  • Hiroki Kosai was born in Kurashiki[2].
  • Hiroki Kosai was born on +1933-02-08T00:00:00Z[3].
  • Hiroki Kosai held citizenship in Japan[6].
  • Hiroki Kosai worked as an astronomer[4].
  • Among Hiroki Kosai's employers was Kiso Observatory[7].
  • Hiroki Kosai was educated at Keio University[8].
  • Hiroki Kosai was a member of International Astronomical Union[9].
  • Hiroki Kosai is recorded as male[10].
  • Hiroki Kosai's instance of is recorded as human[11].
  • Hiroki Kosai's ISNI is recorded as 0000000082676231[12].
  • Hiroki Kosai's VIAF cluster ID is recorded as 75262668[13].
  • Hiroki Kosai's Library of Congress authority ID is recorded as n84178193[14].
  • Hiroki Kosai's NACSIS-CAT author ID is recorded as DA01857269[15].
  • Hiroki Kosai's NDL Authority ID is recorded as 00035651[16].
  • Hiroki Kosai's Freebase ID is recorded as /m/0391lh[17].
  • Hiroki Kosai's family name is recorded as Kōsai[18].
  • Hiroki Kosai's given name is recorded as Hiroki[19].
  • Hiroki Kosai's name in native language is recorded as {'lang': 'ja', 'text': '香西洋樹'}[20].
  • Hiroki Kosai's name in kana is recorded as こうさい ひろき[21].
  • Hiroki Kosai's Prabook ID is recorded as 2350919[22].
  • Hiroki Kosai's IAU member ID is recorded as 7443[23].
  • Hiroki Kosai's WorldCat Entities ID is recorded as E39PBJqQwjF4JKhRhKPVymrg8C[24].
  • Hiroki Kosai's CiNii Research ID is recorded as 1140000791711760000[25].

Body

Origins and Family

Hiroki Kosai was born in Kurashiki[2]. He was born on +1933-02-08T00:00:00Z[3].

Education

Hiroki Kosai was educated at Keio University[8].

Career and Affiliations

Hiroki Kosai's professions included astronomer[4]. He was employed by Kiso Observatory[7].

Why It Matters

Hiroki Kosai ranks in the top 0.73% of human entities by monthly Wikipedia readership (6 views/month, #7,295 of 1,000,298).[5] He has Wikipedia articles in 13 language editions, a strong signal of global cultural recognition.[26] He is known by 15 alternative names across languages and contexts.[27]

He is credited with the discovery of 3391 Sinon[28], an asteroid[29]; 14820 Aizuyaichi[30], an asteroid[31]; 11255 Fujiiekio[32], an asteroid[33]; 4890 Shikanosima[34], an asteroid[35]; 4526 Konko[36], an asteroid[37]; and 4929 Yamatai[38], an asteroid[39].

FAQs

Where was Hiroki Kosai born?

Born in Kurashiki[2], Hiroki Kosai…

What did Hiroki Kosai do for work?

Hiroki Kosai worked as astronomer[4].

Where did Hiroki Kosai go to school?

Hiroki Kosai was educated at Keio University[8].

What did Hiroki Kosai discover?

Hiroki Kosai is credited as discoverer of 3391 Sinon[28], 14820 Aizuyaichi[30], 11255 Fujiiekio[32], and 4890 Shikanosima[34].

References

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

Direct Wikidata claims

  1. [2] . wikidata.org.
  2. [10] . wikidata.org.
  3. [6] . wikidata.org.
  4. [11] . wikidata.org.
  5. [8] . wikidata.org.
  6. [4] . wikidata.org.
  7. [7] . wikidata.org.
  8. [12] . wikidata.org.
  9. [13] . wikidata.org.
  10. [14] . wikidata.org.
  11. [15] . CiNii Research. Retrieved . wikidata.org.
  12. [16] . wikidata.org.
  13. [9] . wikidata.org.
  14. [3] . wikidata.org.
  15. [17] . Freebase Data Dumps. wikidata.org.
  16. [18] . wikidata.org.
  17. [19] . wikidata.org.
  18. [20] . wikidata.org.
  19. [21] . wikidata.org.
  20. [22] . wikidata.org.
  21. [23] . wikidata.org.
  22. [24] . Retrieved . wikidata.org.
  23. [25] . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [28] . wikidata.org. → on this site
  2. [30] . wikidata.org. → on this site
  3. [32] . wikidata.org. → on this site
  4. [34] . wikidata.org. → on this site
  5. [36] . wikidata.org. → on this site
  6. [38] . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [29] . Wikidata. wikidata.org. → on this site
  2. [31] . Wikidata. wikidata.org. → on this site
  3. [33] . Wikidata. wikidata.org. → on this site
  4. [35] . Wikidata. wikidata.org. → on this site
  5. [37] . Wikidata. wikidata.org. → on this site
  6. [39] . Wikidata. wikidata.org. → on this site

Class ancestry

  1. [1] . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [5] . Wikimedia Foundation. dumps.wikimedia.org.
  2. [26] . Wikidata sitelinks. wikidata.org.
  3. [27] . Wikidata aliases. 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). Hiroki Kosai. Retrieved April 10, 2026, from https://4ort.xyz/entity/hiroki-kosai
MLA “Hiroki Kosai.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Apr. 2026, https://4ort.xyz/entity/hiroki-kosai.
BibTeX @misc{4ortxyz_hiroki-kosai_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Hiroki Kosai}}, year = {2026}, url = {https://4ort.xyz/entity/hiroki-kosai}, note = {Accessed: 2026-04-10}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Hiroki Kosai — https://4ort.xyz/entity/hiroki-kosai (retrieved 2026-04-10)

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