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SDSS J164222.94+321710.3 | Black Holes | Apex Andromeda | Apex Andromeda

Black Holes/SDSS J164222.94+321710.3

InferredQuasar Black HoleMass Qualified Quasar

Unified black-hole record

SDSS J164222.94+321710.3

Single-epoch C IV virial black-hole mass estimate; not a direct dynamical measurement

Mass≈11.455B M☉

DistanceNot reported by source catalogs

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-quasar:J/ApJS/228/9/table1:262095
Canonical name: SDSS J164222.94+321710.3
Alternate names: None reported
Black-hole type: Quasar Black Hole
Status: Inferred
Population: Mass Qualified Quasar
Confidence: Single-epoch C IV virial black-hole mass estimate; not a direct dynamical measurement
Host galaxy: Not reported by source catalogs

Position

Coordinates and distance

Right ascension (RA): 250.595621°
Declination (Dec): 32.286206°
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: 3.955

Physical profile

Mass, spin, and system

Mass: ≈11.455B 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: 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: Single-epoch C IV virial broad-line mass estimate
Discovery year: Not reported by source catalogs
Discovery observatory: Not reported by source catalogs
X-ray properties: Not reported by source catalogs
Radio properties: log Lbol=47.348; log Eddington ratio=-0.811
Gravitational-wave event: Not reported by source catalogs

Provenance

Sources and refresh state

Source catalog: VizieR J/ApJS/228/9
Source reference: 2017ApJS..228....9K
Last updated: 2026-09-12T03:20:07.578Z
Source record: Open provider record ↗