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4U 1543-475 | Black Holes | Apex Andromeda | Apex Andromeda

Black Holes/4U 1543-475

ConfirmedStellar-Mass Binary

Unified black-hole record

4U 1543-475

Dynamically confirmed black hole

Also known as IL Lupi

Mass8.4 M☉

Distance24.462K ly

HostNot reported by source catalogs

Drag to orbitScroll to zoomEmbedded animation playing

3D model “Blackhole” by rubykamen, licensed under CC BY 4.0.

Catalog record

Identity and classification

ID: vizier-blackcat:J/ApJS/222/15/table12:16
Canonical name: 4U 1543-475
Alternate names: IL Lupi
Black-hole type: Stellar-Mass Binary
Status: Confirmed
Population: Catalog
Confidence: Dynamically confirmed black hole
Host galaxy: Not reported by source catalogs

Position

Coordinates and distance

Right ascension (RA): 236.78466667°
Declination (Dec): -47.66966667°
Galactic longitude (l): 330.9266°
Galactic latitude (b): 5.3626°
Distance: 24.462K light-years
Distance error: 1.631K light-years
Redshift: Not reported by source catalogs

Physical profile

Mass, spin, and system

Mass: 8.4 solar masses
Mass error, lower: Not reported by source catalogs
Mass error, upper: Not reported by source catalogs
Spin: Not reported by source catalogs
Companion: IL Lup
Companion type: A2V
Orbital period: 1.1164070833333333 days
Inclination: 20.7°

Evidence

Detection and discovery

Detection method: Dynamical mass measurement in an X-ray binary
Discovery year: 1971
Discovery observatory: U
X-ray properties: WATCHDOG source type: BH,T,R
Radio properties: Not reported by source catalogs
Gravitational-wave event: Not reported by source catalogs

Provenance

Sources and refresh state

Source catalog: VizieR J/ApJS/222/15 (WATCHDOG/BlackCAT)
Source reference: 2016ApJS..222...15T
Last updated: 2026-08-31T01:34:41.049Z
Source record: Open provider record ↗