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Sagittarius A*

the supermassive black hole at the center of the Milky Way Galaxy
Thing Astronomical Radio Source Q237284
Sagittarius A*
Original uploader was Serendipodous at en.wikipedia · Public Domain · Wikimedia

Facts

13 properties
Instance of
astronomical radio source, supermassive black hole, astrophysical X-ray source, gamma-ray source[4][5][6]
Part of
Galactic Center of Milky Way, Sagittarius A[8][9]
Catalog code
CXOGC J174540.0-290027, [SKM2002] 28[15][16]
Child astronomical body
GCIRS 13E, S2, S0-102, S4714, S4716[10][11][12][13][14]
Constellation
Sagittarius[7]
Declination
-29.007824972[24]
Discoverer or inventor
National Radio Astronomy Observatory, Robert Hanbury Brown[2][3]
Distance from Earth
+26000[21]
Epoch
J2000.0[25]
Mass
4.0M (4.0M–4.3M, n=3)[18][19][20]
On focus list of Wikimedia project
Wikipedia:Vital articles/Level/4[22]
Right ascension
+266.416816625[23]
Time of discovery or invention
February 14, 1974[17]
🏷️ Also known as
en Sgr A* en Sagittarius A* ar منطقة الرامي أ* ar منطقة القوس أ* ar القوس أ* ar الرامي A* cs Střelec A* da Sgr A* de Sagittarius A de IRS 13 de Sgr A* el Τοξότης A* es Sagittarius A* es Sagitario A* es Sgr A* fa کمان ای* fi Sgr A* fr Sgr A* he סגיטריוס A* hi धनु ए*
🔖 Identifiers · 13
VIAF cluster ID
316600730
Library of Congress Authorities ID
sh2007002976
OpenAlex ID
C2778952920
Encyclopedia of China (Third Edition) ID (2026)
3wt1pI
Encyclopedia of China (Third Edition) old ID (2021)
203171
Encyclopædia Britannica Online ID
topic/Sagittarius-A-black-hole
FAST ID
1922707
Freebase ID
/m/03fz_q
J9U entity ID
987007556708205171
Pixiv Encyclopedia ID
いて座A*
SIMBAD ID
NAME Sgr A*
Vikidia article ID
fr:Sagittarius_A*
Show all 13 identifiers +1
WikiKids ID
Sagittarius_A*

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

🔗 Connections
← Parent astronomical body 6
Solar System, Milky Way, S2, GCIRS 13E, S0-102, S4716
Child astronomical body 5
Solar System, S2, GCIRS 13E, S0-102, S4716
Belongs to 2
Galactic Center of Milky Way, Sagittarius A
Discoverer or inventor 2
National Radio Astronomy Observatory, Robert Hanbury Brown
Instance of 2
supermassive black hole, astronomical radio source
Part of 2
Galactic Center of Milky Way, Sagittarius A
Constellation 1
Sagittarius
Epoch 1
J2000.0
On focus list of Wikimedia project 1
Wikipedia:Vital articles/Level/4
Parent astronomical body 1
Sagittarius A
← Child astronomical body 1
Sagittarius A
← FactGrid item ID 1
Granjeno
← Main subject 1
Event Horizon Telescope
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Summary

Sagittarius A is an astronomical radio source[1]. Sagittarius A

Why It Matters

Sagittarius A Sagittarius A

🛰️ Living Edge · news-derived, source-cited

high ≥ 0.90 · emerging ≥ 0.65 · low below — calibrated against hand-rated truth (single-source .44 · two-source .62 · production-typical .70), so a band is a measurement, not a promise. High is rare by design: it needs both a supported assertion and an evidence sentence. A confirmed or contradicted chip is a Wikidata cross-check; no chip means Wikidata has no value for that property — the ordinary case here, and it says nothing either way. A confirm-only note marks a property whose check can never disagree (Wikidata's border and capital data is not exhaustive), so silence there is a limit of the check, not of the claim.

served-tier precision 80.7% [76.2, 84.5] · rated rows currently served n=342 · entailment-gated at 0.85 · measured 2026-09-29 · re-scored every 10 min, demoted at the half-hourly fold

Located in the administrative territorial entity Milky Way emerging0.753 independent sources

evidence “S301, you see, orbits Sagittarius A* (Sgr A*), the supermassive black hole that inhabits the exact geometric center of our Milky Way galaxy.” scientificamerican.com · read source

References

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

Direct Wikidata claims

  1. [4] ↑ . wikidata.org.
  2. [5] ↑ . SIMBAD. wikidata.org.
  3. [6] ↑ . SIMBAD. wikidata.org.
  4. [7] ↑ . wikidata.org.
  5. [2] ↑ . Cornell University Library. wikidata.org.
  6. [3] ↑ . Department of Astronomy, University of Belgrade. wikidata.org.
  7. [8] ↑ . University of California, Los Angeles. wikidata.org.
  8. [9] ↑ . wikidata.org.
  9. [10] ↑ . wikidata.org.
  10. [11] ↑ . wikidata.org.
  11. [12] ↑ . wikidata.org.
  12. [13] ↑ . wikidata.org.
  13. [14] ↑ . wikidata.org.
  14. [15] ↑ . SIMBAD. wikidata.org.
  15. [16] ↑ . SIMBAD. wikidata.org.
  16. [17] ↑ . wikidata.org.
  17. [18] ↑ . Monitoring stellar orbits around the massive black hole in the Galactic Center. wikidata.org.
  18. [19] ↑ . Measuring Distance and Properties of the Milky Way’s Central Supermassive Black Hole with Stellar Orbits. wikidata.org.
  19. [20] ↑ . An improved distance and mass estimate for Sgr A* from a multistar orbit analysis. wikidata.org.
  20. [21] ↑ . University of California, Los Angeles. wikidata.org.
  21. [22] ↑ . wikidata.org.
  22. [23] ↑ . The Very Long Baseline Array Galactic Plane Survey--VGaPS. wikidata.org.
  23. [24] ↑ . The Very Long Baseline Array Galactic Plane Survey--VGaPS. wikidata.org.
  24. [25] ↑ . SIMBAD. wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. 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). Sagittarius A*. Retrieved November 10, 2026, from https://4ort.xyz/entity/sagittarius-a
MLA “Sagittarius A*.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Nov. 2026, https://4ort.xyz/entity/sagittarius-a.
BibTeX @misc{4ortxyz_sagittarius-a_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Sagittarius A*}}, year = {2026}, url = {https://4ort.xyz/entity/sagittarius-a}, note = {Accessed: 2026-11-10}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Sagittarius A* — https://4ort.xyz/entity/sagittarius-a (retrieved 2026-11-10)

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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. 18w ago · Nyuhn · 2026-07-10 view diff on Wikidata ↗
    Encyclopedia of China (Third Edition) ID (2026) → 3wt1pI
    "Changed the item: QuickStatements 3.0 batch #40849: ZGBK ID"
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