Acquiring mission data

GRS 1739-278 | Black Holes | Apex Andromeda | Apex Andromeda

Strong CandidateStellar-Mass Binary

Unified black-hole record

GRS 1739-278

Strong black-hole candidate

Also known as XTE J1739-278 · V2606 Oph · SWIFT J174240.0-274455 · Granat 1739-278 · V* V2606 Oph

MassNot reported by source catalogs

Distance23.646K ly

HostNot reported by source catalogs

3D model “Blackhole” by rubykamen, licensed under CC BY 4.0.

Catalog record

Identity and classification

ID: vizier-blackcat:J/ApJS/222/15/table12:40
Canonical name: GRS 1739-278
Alternate names: XTE J1739-278 · V2606 Oph · SWIFT J174240.0-274455 · Granat 1739-278 · V* V2606 Oph
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): 265.66679167°
Declination (Dec): -27.74797222°
Galactic longitude (l): 0.6721°
Galactic latitude (b): 1.1758°
Distance: 23.646K light-years
Distance error: 4.077K light-years
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: 1996
Discovery observatory: G
X-ray properties: WATCHDOG source type: BHC,T,R
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: 2026-09-11T22:32:44.775Z
Source record: Open provider record ↗

Merged source records

VizieR J/ApJS/222/15 (WATCHDOG/BlackCAT)2016ApJS..222...15T
SIMBAD black-hole object typesSIMBAD object type BH/BH?