Animated 3D modelInferredSupermassive
ARP 321 NED01
Cataloged mass estimate
- Mass
- 516.8M M☉
- Distance
- 296.15M ly
- Host
- ARP 321 NED01
- Source
- VizieR J/A+A/521/A55
Acquiring mission data
Apex AndromedaApex AndromedaAcquiring mission data
Apex Andromeda · Deep-object catalog
A source-scoped research catalog of measured systems, candidates, mass-qualified quasars, and curated notable black holes—without pretending every estimate has the same evidentiary weight.
The object catalog combines bounded VizieR mass catalogs, mass-qualified ultramassive SDSS quasars, BlackCAT binaries, SIMBAD BH/BH? classifications, and a sourced notable-object registry. It does not claim that every quasar, active galaxy, ULX, or X-ray binary is a confirmed black hole. Gravitational-wave mergers are maintained as a separate population.
Unified research catalog
Confirmed objects, candidates, and luminosity-inferred massive black holes retain their source classification.
Animated 3D modelCataloged mass estimate
Animated 3D modelCataloged mass estimate
Animated 3D modelCataloged mass estimate
Animated 3D modelCataloged mass estimate
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