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Missions Planets Black Holes 3D Map Agencies Blog About apexandromeda.com

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4U 2030+40 | Black Holes | Apex Andromeda | Apex Andromeda

Black Holes/4U 2030+40

Strong CandidateStellar-Mass Binary

Unified black-hole record

4U 2030+40

Strong black-hole candidate

Also known as Cyg X-3 · V1521 Cyg

MassNot reported by source catalogs

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/table12:76
Canonical name: 4U 2030+40
Alternate names: Cyg X-3 · V1521 Cyg
Black-hole type: Stellar-Mass Binary
Status: Strong Candidate
Population: Catalog
Confidence: Strong black-hole candidate
Host galaxy: Not reported by source catalogs

Position

Coordinates and distance

Right ascension (RA): 308.10741667°
Declination (Dec): 40.95775°
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: Not reported by source catalogs
Mass error, lower: Not reported by source catalogs
Mass error, upper: Not reported by source catalogs
Spin: Not reported by source catalogs
Companion: Not reported by source catalogs
Companion type: Not reported by source catalogs
Orbital period: Not reported by source catalogs
Inclination: Not reported by source catalogs

Evidence

Detection and discovery

Detection method: X-ray binary classification
Discovery year: 1966
Discovery observatory: Ae
X-ray properties: WATCHDOG source type: BHC,P,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 ↗

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