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XTE J1118+480 | Black Holes | Apex Andromeda | Apex Andromeda

Black Holes/XTE J1118+480

ConfirmedStellar-Mass Binary

Unified black-hole record

XTE J1118+480

Dynamically confirmed black hole

Also known as KV UMa

Mass6.9 M☉

Distance5.545K 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/table12:7
Canonical name: XTE J1118+480
Alternate names: KV UMa
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): 169.54495833°
Declination (Dec): 48.03678333°
Galactic longitude (l): 157.6607°
Galactic latitude (b): 62.3206°
Distance: 5.545K light-years
Distance error: 326.156 light-years
Redshift: Not reported by source catalogs

Physical profile

Mass, spin, and system

Mass: 6.9 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: (KV UMa)
Companion type: K7-M1V
Orbital period: 0.16993391666666668 days
Inclination: 68°

Evidence

Detection and discovery

Detection method: Dynamical mass measurement in an X-ray binary
Discovery year: 2000
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 ↗