GRO J1655-40

Stellar-mass black hole

A 'microquasar' that shoots out jets of material at more than 90 percent of the speed of light.

GRO J1655-40, a stellar-mass black holeComputed render
Computed render: general-relativistic ray-trace; colours mapped to a visible range. Not a photograph.
6.3 ☉
mass (the Sun = 1)
19 km
event-horizon radius (computed)
11,000 ly
from Earth

Mass is a best estimate from the cited observations, which carry their own measurement uncertainty.

Its event horizon, the edge past which nothing returns, spans about 19 km in radius.

It lives in
Milky Way
Barred spiral galaxy.
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Black holes of similar mass
A0620-00Stellar-mass6.6 ☉GW200115_042309Gravitational-wave source7.2 ☉V404 CygniStellar-mass9.0 ☉LMC X-1Stellar-mass10.9 ☉GW190917_114630Gravitational-wave source11.6 ☉GW241109_115924Gravitational-wave source11.9 ☉
Worlds in the same direction on the sky→
Source: Curated from public catalogs via Wikidata (CC0). See data & analysis for full sourcing.
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