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 February 8, 1933[3]. He worked as an astronomer[4]. He ranks in the top 0.73% of human entities by monthly Wikipedia readership (7 views/month, #7,295 of 1,000,298).[5]

Key Facts

  • Hiroki Kosai was born in Kurashiki[2].
  • Hiroki Kosai was born on February 8, 1933[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 family name is recorded as Kōsai[12].
  • Hiroki Kosai's given name is recorded as Hiroki[13].
  • Hiroki Kosai's name in native language is recorded as {'lang': 'ja', 'text': '香西洋樹'}[14].
  • Hiroki Kosai's name in kana is recorded as こうさい ひろき[15].

Body

Origins and Family

Hiroki Kosai was born in Kurashiki[2]. He was born on February 8, 1933[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 (7 views/month, #7,295 of 1,000,298).[5] He has Wikipedia articles in 13 language editions, a strong signal of global cultural recognition.[16] He is known by 15 alternative names across languages and contexts.[17]

He is credited with the discovery of 3391 Sinon[18], an asteroid[19]; 26794 Yukioniimi[20], an asteroid[21]; 7627 Wakenokiyomaro[22], an asteroid[23]; 5541 Seimei[24], an asteroid[25]; 12221 Ogatakoan[26], an asteroid[27]; and 4963 Kanroku[28], an asteroid[29].

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[18], 26794 Yukioniimi[20], 7627 Wakenokiyomaro[22], and 5541 Seimei[24].

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. [9] . wikidata.org.
  9. [3] . wikidata.org.
  10. [12] . wikidata.org.
  11. [13] . wikidata.org.
  12. [14] . wikidata.org.
  13. [15] . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [18] . wikidata.org. → on this site
  2. [20] . wikidata.org. → on this site
  3. [22] . wikidata.org. → on this site
  4. [24] . wikidata.org. → on this site
  5. [26] . wikidata.org. → on this site
  6. [28] . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [19] . Wikidata. wikidata.org. → on this site
  2. [21] . Wikidata. wikidata.org. → on this site
  3. [23] . Wikidata. wikidata.org. → on this site
  4. [25] . Wikidata. wikidata.org. → on this site
  5. [27] . Wikidata. wikidata.org. → on this site
  6. [29] . 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. [16] . Wikidata sitelinks. wikidata.org.
  3. [17] . 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)

Canonical URL: https://4ort.xyz/entity/hiroki-kosai · Last refreshed:

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. 3d ago · Alex Cohn · 2026-07-05 view diff on Wikidata ↗
    Date of death +2026-03-26T00:00:00Z
    "/* wbsetclaim-create:1||1 */ [[Property:P570]]: 26 March 2026"
  2. 24d ago · Pigsonthewing · 2026-06-14 view diff on Wikidata ↗
    Employer
    Place of birth Kurashiki
    Occupation astronomer
    P14528 31024
    + 14 other properties edited (see Wikidata diff for full list)
    "/* wbcreateclaim-create:1| */ [[Property:P14528]]: 31024, [[:toollabs:quickstatements/#/batch/259666|batch #259666]]"
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