Research any topic before you write.

Find related topics. | Discover entities. | See connections. | Build a topical map.

Centaurus A

Centaurus A (also known as NGC 5128 or Caldwell 77) is a galaxy in the constellation of Centaurus. It was discovered in 1826 by Scottish astronomer James Dunlop from his home in Parramatta, in New South Wales, Australia. There is considerable debate in the literature regarding the galaxy's fundamental properties such as its Hubble type (lenticular galaxy…

History, Observational history & Novae and supernovae

Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.

Research this topic

Explore the main themes, entities and connections around Centaurus A. Start with the topic map, then use the sections below for research and deeper semantic analysis.

Explore this topic

Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Apparent magnitude (V)
6.84
Apparent size (V)
25.7′ × 20.0′
Constellation
Centaurus
Declination
−43° 01′ 08.806″
Distance
11–13 Mly (3–5 Mpc)
Heliocentric radial velocity
547 ± 5 km/s

Topics to explore

Browse the full topic structure. Each item opens a new analysis centered on that subject.

Overview

Observational history

Morphology

Novae and supernovae

Distance

Nearby galaxies and galaxy group information

Observations

Visibility

Gallery

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

Map overview Semantic statistics

Centaurus A

Nodes85
Edges84
Triples112
Avg. degree1.98
Density0.023529
Components1

How this topic connects Entity context

See the strongest relationship patterns around the current topic before diving into the raw triples.

Centaurus A

Top relations

related to External links · 32
Centaurus A → Active Galaxy, Archived, Articles, Astrophoto, Centaurus, Centaurus ANASA's APOD, Centaurus ANGC, Constellation Guide, Deep Sky Observer's Companion, DOCdb, DSS2, GALEX, High-resolution, Hubble, Hydrogen, IRAS, July, March, May, NASA's APOD
related to Nearby galaxies and galaxy group information · 13
Centaurus A → Centaurus, Centaurus A/M83 Group, However, In, M83, Messier, Some, Southern Pinwheel Galaxy, The, The Centaurus A/M83 Group, These, VHH81-01, Virgo Supercluster
related to Gallery · 11
Centaurus A → ALMAThe, Cen, Centaurus, Central, False-colour, Hubble's, Image, Spitzer IR, Wide, X-ray, X-rays
related to Sources · 11
Centaurus A → Album Centaurus, Black Hole, Chandra X-Ray Observatory Photo, Feed, How, Hubble Provides Multiple Views, Jet, March, Press, Space Telescope Science Institute, STScI
related to Distance · 8
Centaurus A → Centaurus, Classical Cepheids, Distance, Local Group, Mira, Mpc, The, Type II Cepheids
related to Novae and supernovae · 8
Centaurus A → Centaurus, It, May, Robert Evans, SN, The, Two, Type Ia
related to Morphology · 7
Centaurus A → As, Centaurus, Earth, Halton Arp's Atlas, John Herschel, Peculiar Galaxies, The
related to Visibility · 5
Centaurus A → Because, Centaurus, Claims, Omega Centauri, The
related to Radio waves · 3
Centaurus A → Centaurus, Event Horizon Telescope, In July
Apparent magnitude (V) · 1
Centaurus A → 6.84

Important terminology Word statistics

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

galaxy centaurus radio x-ray type galaxies also discovered jet ngc elliptical dust 5128 distance observatory black hole one large million

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Centaurus AApparent magnitude (V)6.841.00infobox
Centaurus AApparent size (V)25.7′ × 20.0′1.00infobox
Centaurus AConstellationCentaurus1.00infobox
Centaurus ADeclination−43° 01′ 08.806″1.00infobox
Centaurus ADistance11–13 Mly (3–5 Mpc)1.00infobox
Centaurus AHeliocentric radial velocity547 ± 5 km/s1.00infobox
Centaurus ANotable featuresClosest radio galaxy; closest BL Lacertae object; unusual dust lane1.00infobox
Centaurus ARedshift0.001825±0.00001671.00infobox
Centaurus ARight ascension13h 25m 27.6150s1.00infobox
Centaurus ASize~123,100 ly (37.74 kpc) (estimated)1.00infobox
Centaurus ATypeS0 pec or Ep1.00infobox
its Hubble typeinstance ofThere is considerable debate in the literature regarding the galaxy's fundamental properties0.80text

Related concept clusters Concept neighborhoods

These clusters group vocabulary that occurs around closely connected concepts in the source material.

    Connections between topic areas Semantic bridges

    Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.

    Min side: 3
    For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.