Centaurus A
OVERVIEW
] GALAXYCentaurus A is a lenticular galaxy S0 in the constellation Centaurus, 12.00 from Earth, shining at apparent magnitude 7.22 (). It is catalogued as 2MASX J13252775-4301073, C 77 and ESO 270-009, among 12 designations in total. It was discovered in 1826.
The nearest galaxy with an active nucleus: an elliptical wearing a thick dust lane from a galaxy it swallowed, and a radio source spanning degrees of sky.
- WHAT IT IS
- Lenticular galaxy
- HOW FAR
- 12.00
- HOW BIG ON THE SKY
- 25.9
- HOW BRIGHT (V)
The light arriving now left it that long ago.
About as wide as the full Moon.
Binoculars reach it; the naked eye does not.
IMAGES
] 4 FRAMES- ESO/WFI (Optical); MPIfR/ESO/APEX/A.Weiss et al. (Submillimetre); NASA/CXC/CfA/R.Kraft et al. (X-ray)
CC BY 4.0 - Image credit: ESA/Hubble, NASA, Digitized Sky Survey, MPG/ESO
CC BY 4.0 - NASA; uploaded by User:Dipankan001.
Public domain - R.Kraft (SAO) et al., CXO, NASA
Public domain
OBSERVING
] FROM WHERE YOU AREWhat it takes to see Centaurus A for yourself. Everything in this part of the page is worked out for a real horizon, a real night and the equipment you say you have.
Say where you are, and this line says when Centaurus A is worth going out for.
THROUGH AN EYEPIECE
] 150 MM TELESCOPE · 25 MM EYEPIECEToo faint for your eyes alone. Binoculars reach it. Centaurus A covers 25.9′ of sky against a of 1.08°, so at 48× it is comfortably framed.
- 48×
- 1.08
- 1.25
- 13.0
- SIZE ON THE SKY
- 25.9
- FILLS OF THE FIELD
- 40% of the width
- APPARENT MAGNITUDE ()
- 7.22 · within reach
Centaurus A is not a point of light, so the limit above is the wrong one to hold it against: the same brightness spread over 25.9′ of sky is harder than a star of it, and goes first — spread out, it comes to 23.6 . Catalogued sizes are measured to a photographic contour, and the part an eye sees is usually smaller.
APPARENT PLACE
] EQUINOX J2026.7Where a telescope has to be pointed today, which is not quite where the catalogue records the object: the coordinate grid itself has turned since the year 2000 the catalogue is referred to.
- RIGHT ASCENSION
- DECLINATION
- GRID TURNED SINCE
- 19.2
- PROPER MOTION SINCE
- none published
Computed for 2026-08-27 00:00 UT. No proper motion is published for Centaurus A, so nothing here moves the object; what separates this from the catalogued position above is the coordinate grid turning under it — about fifty arcseconds a year of precession since 2000, and the small nodding of the Earth’s axis on top of that. Aberration and refraction are not included, and neither is parallax; each is under an arcminute, which is also about as well as the catalogued position is known. The same figure for any date.
CATALOG DATA
] 17 FIELDSThe raw catalogue values, as the source published them, with the error bars where one was published — sorted by what each set of figures is about rather than by the order they happened to be stored in.
WHAT IT IS MADE OF
What the object is in itself, rather than how it happens to look from here.
- Hubble type
HOW BRIGHT IT IS
What the light adds up to, measured through one filter at a time. A magnitude is a brightness on a backwards scale — the smaller the number, the brighter the object.
- Apparent magnitude ()
- Apparent magnitude ()
- Apparent magnitude ()
- Apparent magnitude ( band)
- Apparent magnitude ()
- Surface brightness
- 23.59
WHERE IT IS AND HOW IT MOVES
Position, motion across the sky and the size it covers on it. These are measurements of the object as seen from here, so every one of them depends on where here is.
- Radial velocity
- 547
- Redshift (z)
- Redshift (z, CMB frame)
- Major axis
- 25.88
- Minor axis
- 19.77
- 33
WHEN IT WAS FOUND
Who first saw it, from where, and by what method.
- Discovered by
- James Dunlop
OTHER NAMES AND NUMBERS
The identifiers other catalogues file this object under, for anyone joining this data to theirs.
- OpenNGC type code
- G
- Wikidata item
- Q487255
- Wikipedia article
- Centaurus A
ALSO KNOWN AS
] 12 DESIGNATIONS- 2MASX 2MASX J13252775-4301073
- Caldwell C 77
- Common name Centaurus A
- ESO ESO 270-009
- ESO ESO 270-9
- ESO-LV ESO-LV 270-0090
- IRAS IRAS 13225-4245
- IRAS IRAS F13225-4245
- LEDA LEDA 46957
- MCG MCG -07-28-001
- NGC NGC 5128
- PGC PGC 46957
LOOK IT UP ELSEWHERE
] 4 SERVICESEach link carries the identifier printed beside it. Nothing on this page is a measurement of our own, so a number that disagrees with one of these is worth reporting — and a service that has never catalogued this object under this name will say so plainly.
- SIMBADNGC 5128
Cross-identifications, measured values and the reference behind each of them.
- NEDNGC 5128
Redshift-independent distances, photometry across the spectrum and the extragalactic literature.
- ADSobject:"NGC 5128"
Papers indexed against this object rather than against the string, newest first.
- VizieR600″ around 201.3651 -43.0191
Every published table with a row at this position, searched by coordinates rather than by name.
CITE THIS PAGE
] DR1This page is live and its numbers move when an upstream refreshes, so the citation names the release the rows belong to rather than the day you read them. The release itself is frozen, republished as a bundle, and is what a data-availability statement should point at.
SpaceCatalog. Centaurus A [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-5128
@misc{spacecatalog_ngc-5128,
author = {{SpaceCatalog}},
title = {{Centaurus A}},
howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
year = {2026},
url = {https://spacecatalog.org/object/ngc-5128},
note = {Catalogue entry, data release DR1 (2026-08-21). Values from OpenNGC.}
}The values above were taken from OpenNGC — CC-BY-SA-4.0. Citing this page does not replace citing that catalogue, and its licence is share-alike: the terms reach whatever you build from these rows.
RECENT ACTIVITY
] 4 ITEMS- Webb uncovers unusual galaxy shaped by cosmic collision2026-07-06 · ESA/Webb · IMAGE
- Decomposing cool stellar populations with H-band spectral fluctuations: Long-period variable stars in NGC 5128 and carbon stars in NGC 51022026-05-20 · arXiv · PAPER · Russell J. Smith, Anastasia Gvozdenko
- Significant or Not? The Impact of Randomisation During Data Reduction on Confirming a New Pulsating Ultraluminous X-ray Source Candidate in Centaurus A2026-05-14 · arXiv · PAPER · Amy H. Knight, Timothy P. Roberts, Callum Potter, Alistair T. Pagan, Dominic J. Walton
- Catalogue of central stars of extragalactic planetary nebulae2025-08-28 · arXiv · PAPER · W. A. Weidmann, M. B. Mari, R. A. Pignata, M. M. Miller Bertolami, E. O. Schmidt, K. Werner
ESA/Webb · arXiv · UPDATED DAILY