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Explorer 21

American satellite of Explorers program
Vehicle spacecraft Q3736074
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Explorer 21

Summary

Explorer 21 is a spacecraft[1]. It draws 8 Wikipedia views per month (spacecraft category, ranking #35 of 114).[2]

Key Facts

  • Explorer 21's image is recorded as Explorer-21 image.jpg[3].
  • Explorer 21's instance of is recorded as spacecraft[4].
  • Explorer 21's COSPAR ID is recorded as 1964-060A[5].
  • Explorer 21's Commons category is recorded as Explorer 21[6].
  • Explorer 21's space launch vehicle is recorded as Delta C[7].
  • Explorer 21's SCN is recorded as 00889[8].
  • Explorer 21's UTC date of spacecraft launch is recorded as +1964-10-04T00:00:00Z[9].
  • Explorer 21's significant event is recorded as rocket launch[10].
  • Explorer 21's start point is recorded as Cape Canaveral Space Launch Complex 17[11].
  • Explorer 21's Google Knowledge Graph ID is recorded as /g/120r4xpx[12].
  • Explorer 21's Wolfram Language entity code is recorded as Entity["Satellite", "00889"][13].

Why It Matters

Explorer 21 draws 8 Wikipedia views per month (spacecraft category, ranking #35 of 114).[2] It has Wikipedia articles in 5 language editions, a strong signal of global cultural recognition.[14] It is known by 3 alternative names across languages and contexts.[15]

Related Entities

Beacon Explorer-B Cape Canaveral Space Launch Complex 17 Delta C spacecraft

References

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

Direct Wikidata claims

  1. [3] ↑ . wikidata.org.
  2. [4] ↑ . wikidata.org.
  3. [5] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . Jonathan's Space Report. wikidata.org.
  6. [8] ↑ . Jonathan's Space Report. wikidata.org.
  7. [9] ↑ . Jonathan's Space Report. wikidata.org.
  8. [10] ↑ . Jonathan's Space Report. wikidata.org.
  9. [11] ↑ . Jonathan's Space Report. wikidata.org.
  10. [12] ↑ . wikidata.org.
  11. [13] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [14] ↑ . Wikidata sitelinks. wikidata.org.
  3. [15] ↑ . 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). Explorer 21. Retrieved May 3, 2026, from https://4ort.xyz/entity/explorer-21
MLA “Explorer 21.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/explorer-21.
BibTeX @misc{4ortxyz_explorer-21_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Explorer 21}}, year = {2026}, url = {https://4ort.xyz/entity/explorer-21}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Explorer 21 — https://4ort.xyz/entity/explorer-21 (retrieved 2026-05-03)

Canonical URL: https://4ort.xyz/entity/explorer-21 · Last refreshed: