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GS 2000+251 | Black Holes | Apex Andromeda | Apex Andromeda

Black Holes/GS 2000+251

ConfirmedStellar-Mass Binary

Unified black-hole record

GS 2000+251

Dynamically confirmed black hole

Also known as QZ Vul · Nova Vul 1988

Mass5.5 M☉

Distance8.806K 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/table12:73
Canonical name: GS 2000+251
Alternate names: QZ Vul · Nova Vul 1988
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): 300.70616667°
Declination (Dec): 25.23648889°
Galactic longitude (l): 63.3666°
Galactic latitude (b): -2.9989°
Distance: 8.806K light-years
Distance error: 2.283K light-years
Redshift: Not reported by source catalogs

Physical profile

Mass, spin, and system

Mass: 5.5 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: QZ Vul
Companion type: K3-7V
Orbital period: 0.3440872916666667 days
Inclination: 54°

Evidence

Detection and discovery

Detection method: Dynamical mass measurement in an X-ray binary
Discovery year: 1988
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 ↗