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XTE J1859+226 | Black Holes | Apex Andromeda | Apex Andromeda

Black Holes/XTE J1859+226

ConfirmedStellar-Mass Binary

Unified black-hole record

XTE J1859+226

Dynamically confirmed black hole

Also known as V406 Vul

Mass5.42 M☉

Distance40.77K 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/table12:65
Canonical name: XTE J1859+226
Alternate names: V406 Vul
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): 284.67325°
Declination (Dec): 22.65816667°
Galactic longitude (l): 54.0461°
Galactic latitude (b): 8.6076°
Distance: 40.77K light-years
Distance error: 4.892K light-years
Redshift: Not reported by source catalogs

Physical profile

Mass, spin, and system

Mass: 5.42 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: V406 Vul
Companion type: ~K5V
Orbital period: 0.27416666666666667 days
Inclination: 70°

Evidence

Detection and discovery

Detection method: Dynamical mass measurement in an X-ray binary
Discovery year: 1999
Discovery observatory: Rx
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 ↗