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GRO J1655-40 | Black Holes | Apex Andromeda | Apex Andromeda

Black Holes/GRO J1655-40

ConfirmedStellar-Mass Binary

Unified black-hole record

GRO J1655-40

Dynamically confirmed black hole

Also known as V1033 Sco · Nova Sco 1994

Mass6 M☉

DistanceNot reported by source catalogs

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/table12:22
Canonical name: GRO J1655-40
Alternate names: V1033 Sco · Nova Sco 1994
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): 253.50057083°
Declination (Dec): -39.84580556°
Galactic longitude (l): Not reported by source catalogs
Galactic latitude (b): Not reported by source catalogs
Distance: Not reported by source catalogs
Distance error: Not reported by source catalogs
Redshift: Not reported by source catalogs

Physical profile

Mass, spin, and system

Mass: 6 solar masses
Mass error, lower: 0.4 solar masses
Mass error, upper: 0.4 solar masses
Spin: Not reported by source catalogs
Companion: N. Sco 94
Companion type: F6IV
Orbital period: 2.6216666666666666 days
Inclination: 69°

Evidence

Detection and discovery

Detection method: Dynamical mass measurement in an X-ray binary
Discovery year: 1994
Discovery observatory: CG
X-ray properties: WATCHDOG source type: BH,T,R,J,W
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 ↗

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