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NGC 6939

open cluster in Cepheus
Thing open_cluster Q1148664
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NGC 6939

Summary

NGC 6939 is an open cluster[1]. It has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[2]

Key Facts

  • NGC 6939 is credited with the discovery of William Herschel[3].
  • NGC 6939's instance of is recorded as open cluster[4].
  • NGC 6939's constellation is recorded as Cepheus[5].
  • NGC 6939 is part of Milky Way[6].
  • NGC 6939's Commons category is recorded as NGC 6939[7].
  • NGC 6939's catalog code is recorded as NGC 6939[8].
  • NGC 6939's catalog code is recorded as OCl 217[9].
  • NGC 6939's catalog code is recorded as Melotte 231[10].
  • NGC 6939's catalog code is recorded as Collinder 423[11].
  • NGC 6939's catalog code is recorded as C 2030+604[12].
  • NGC 6939's catalog code is recorded as [KPS2012] MWSC 3357[13].
  • NGC 6939's time of discovery or invention is recorded as September 9, 1798[14].
  • NGC 6939's topic's main category is recorded as Category:NGC 6939[15].
  • NGC 6939's apparent magnitude is recorded as {'unit': '1', 'amount': '+8.85'}[16].
  • NGC 6939's apparent magnitude is recorded as {'unit': '1', 'amount': '+7.8'}[17].
  • NGC 6939's radial velocity is recorded as {'unit': 'http://www.wikidata.org/entity/Q3674704', 'amount': '-42.0'}[18].
  • NGC 6939's metallicity is recorded as {'unit': '1', 'amount': '+0.13'}[19].
  • NGC 6939's metallicity is recorded as {'unit': '1', 'amount': '+0.03'}[20].
  • NGC 6939's distance from Earth is recorded as {'unit': 'http://www.wikidata.org/entity/Q12129', 'amount': '+1870.682'}[21].
  • NGC 6939's right ascension is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+307.8750'}[22].
  • NGC 6939's declination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+60.6617'}[23].
  • NGC 6939's epoch is recorded as J2000.0[24].
  • NGC 6939's declination component of proper motion is recorded as {'unit': 'http://www.wikidata.org/entity/Q22137107', 'amount': '-5.29'}[25].
  • NGC 6939's right ascension component of proper motion is recorded as {'unit': 'http://www.wikidata.org/entity/Q22137107', 'amount': '-2.37'}[26].

Body

Definition and Type

NGC 6939's instance of is recorded as open cluster[4].

Use and Application

NGC 6939 is part of Milky Way[6].

Why It Matters

NGC 6939 has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[2]

References

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

Direct Wikidata claims

  1. [4] ↑ . SIMBAD. Retrieved . wikidata.org.
  2. [5] ↑ . wikidata.org.
  3. [3] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . wikidata.org.
  6. [8] ↑ . SIMBAD. wikidata.org.
  7. [9] ↑ . wikidata.org.
  8. [10] ↑ . A Catalogue of Star Clusters shown on Franklin-Adams Chart Plates. wikidata.org.
  9. [11] ↑ . On Structural Properties of Open Galactic Clusters and their Spatial Distribution. Catalog of Open Galactic Clusters. wikidata.org.
  10. [12] ↑ . SIMBAD. wikidata.org.
  11. [13] ↑ . SIMBAD. wikidata.org.
  12. [14] ↑ . wikidata.org.
  13. [15] ↑ . wikidata.org.
  14. [16] ↑ . SIMBAD. wikidata.org.
  15. [17] ↑ . SIMBAD. wikidata.org.
  16. [18] ↑ . The orbits of open clusters in the Galaxy. wikidata.org.
  17. [19] ↑ . On the metallicity of open clusters. wikidata.org.
  18. [20] ↑ . New neutron-capture measurements in 23 open clusters. I the r-process. wikidata.org.
  19. [21] ↑ . Integrated parameters of star clusters: a comparison of theory and observations. wikidata.org.
  20. [22] ↑ . Blue Stragglers in Galactic Open Clusters and Integrated Spectral Energy Distributions. wikidata.org.
  21. [23] ↑ . Blue Stragglers in Galactic Open Clusters and Integrated Spectral Energy Distributions. wikidata.org.
  22. [24] ↑ . Blue Stragglers in Galactic Open Clusters and Integrated Spectral Energy Distributions. wikidata.org.
  23. [25] ↑ . Proper motions of the optically visible open clusters based on the UCAC4 catalog. wikidata.org.
  24. [26] ↑ . Proper motions of the optically visible open clusters based on the UCAC4 catalog. wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikidata sitelinks. 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). NGC 6939. Retrieved May 7, 2026, from https://4ort.xyz/entity/ngc-6939
MLA “NGC 6939.” 4ort.xyz Knowledge Graph, 4ort.xyz, 7 May. 2026, https://4ort.xyz/entity/ngc-6939.
BibTeX @misc{4ortxyz_ngc-6939_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{NGC 6939}}, year = {2026}, url = {https://4ort.xyz/entity/ngc-6939}, note = {Accessed: 2026-05-07}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): NGC 6939 — https://4ort.xyz/entity/ngc-6939 (retrieved 2026-05-07)

Canonical URL: https://4ort.xyz/entity/ngc-6939 · 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. 6w ago · JAnDbot bot · 2026-07-22 view diff on Wikidata ↗
    Simbad id → NGC 6939
    Declination → {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount':
    Time of discovery or invention → +1798-09-09T00:00:00Z
    Radial velocity → {'unit': 'http://www.wikidata.org/entity/Q3674704', 'amount'
    + 20 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-create:2||1 */ [[Property:P156]]: [[Q1148670]]"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.