Skip to content

Missions Planets Black Holes 3D Map Agencies Blog About Sign in

Menu

Missions Planets Black Holes 3D Map Agencies Blog About Sign in

Acquiring mission data

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

This is an independent informational project and is not affiliated with, endorsed by, or sponsored by NASA, ESA, JAXA, Roscosmos, CNSA, ISRO, CSA, or any other space agency. Agency names, logos, and other marks are used for identification where permitted by their respective usage policies.

A passion project from the team behind Apex Rental Pro.

Community discussion

Comments 0

No comments yet. The airlock is open.

Sign in or create an account to comment and vote.

XTE J1550-564 | Black Holes | Apex Andromeda | Apex Andromeda

Black Holes/XTE J1550-564

ConfirmedStellar-Mass Binary

Unified black-hole record

XTE J1550-564

Dynamically confirmed black hole

Also known as V381 Nor

Mass7.81 M☉

Distance14.677K 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/table12:17
Canonical name: XTE J1550-564
Alternate names: V381 Nor
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): 237.74458333°
Declination (Dec): -56.47644444°
Galactic longitude (l): 325.8825°
Galactic latitude (b): -1.8269°
Distance: 14.677K light-years
Distance error: 1.631K light-years
Redshift: Not reported by source catalogs

Physical profile

Mass, spin, and system

Mass: 7.81 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: (V381 Nor)
Companion type: K2-K4IV
Orbital period: 1.5420333333333334 days
Inclination: 75°

Evidence

Detection and discovery

Detection method: Dynamical mass measurement in an X-ray binary
Discovery year: 1998
Discovery observatory: Rx,CG
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 ↗