H 1755-338

Strong black-hole candidate

Also known as V4134 Sgr · SRGA J175840.6-334827 · 1H 1754-338 · 1M 1755-338 · 2S 1755-338 · 2S 1755-33 · 2U 1757-33 · 3A 1755-338 · 3U 1755-33 · 4U 1755-338 · 4U 1755-33 · GPS 1754-337 · GX -2.5 · Ginga 1755-338 · H 1804-33 · INTREF 868 · X Sco X-6 · X Sco XR-6 · [BM83] X1755-338 · 1ES 1755-33.8 · 1RXS J175840.1-334828 · V* V4134 Sgr

MassNot reported by source catalogs

DistanceNot reported by source catalogs

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/table12:53
Canonical name: H 1755-338
Alternate names: V4134 Sgr · SRGA J175840.6-334827 · 1H 1754-338 · 1M 1755-338 · 2S 1755-338 · 2S 1755-33 · 2U 1757-33 · 3A 1755-338 · 3U 1755-33 · 4U 1755-338 · 4U 1755-33 · GPS 1754-337 · GX -2.5 · Ginga 1755-338 · H 1804-33 · INTREF 868 · X Sco X-6 · X Sco XR-6 · [BM83] X1755-338 · 1ES 1755-33.8 · 1RXS J175840.1-334828 · V* V4134 Sgr
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): 269.66666667°
Declination (Dec): -33.8075°
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: 1971
Discovery observatory: Not reported by source catalogs
X-ray properties: WATCHDOG source type: BHC,P
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?