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GS 1354-64 | Black Holes | Apex Andromeda | Apex Andromeda

Black Holes/GS 1354-64

ConfirmedStellar-Mass Binary

Unified black-hole record

GS 1354-64

Dynamically confirmed black hole

Also known as BW Cir

Mass7.6 M☉

Distance81.539K 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/table12:12
Canonical name: GS 1354-64
Alternate names: BW Cir
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): 209.54041667°
Declination (Dec): -64.73494444°
Galactic longitude (l): 309.9774°
Galactic latitude (b): -2.7797°
Distance: 81.539K light-years
Distance error: Not reported by source catalogs
Redshift: Not reported by source catalogs

Physical profile

Mass, spin, and system

Mass: 7.6 solar masses
Mass error, lower: 0.7 solar masses
Mass error, upper: 0.7 solar masses
Spin: Not reported by source catalogs
Companion: BW Cir
Companion type: G5III
Orbital period: 2.5444999999999998 days
Inclination: 79°

Evidence

Detection and discovery

Detection method: Dynamical mass measurement in an X-ray binary
Discovery year: 1987
Discovery observatory: GS
X-ray properties: WATCHDOG source type: BH,T,R,J?
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 ↗