List of least massive black holes
Below there is a list of the least massive known black holes , sorted by increasing mass. The unit of measurement is the solar mass , equivalent to 2.0× 1030 kg.
List
Name
Mass (M ☉ )
Distance (ly )
Companion class
Mass determination method
Notes
Refs.
V723 Monocerotis
3.04± 0.06
1,500
K0III
Spectroscopic radial velocity measurements of companion.
Mass may be underestimated due not accurately measured distance to the companion star. [clarify ]
[ 1]
2MASS J05215658+4359220
3.3+2.8 −0.7
10,000
K-type (?) giant
Spectroscopic radial velocity measurements of noninteracting companion.
In Milky Way outskirts.
[ 2] [ 3] [ 4]
GW190425's remnant
3.4+0.3 −0.1
518,600,000
N/A
Gravitational wave data of neutron star merger from LIGO and Virgo interferometers.
97% chance of prompt collapse into a black hole immediately after merger. Alternative study suggests collapse 2.5 hours later.
[ 2] [ 5] [ 6] [ 7]
NGC 3201-1
4.36± 0.41
15,600
(see Notes)
Spectroscopic radial velocity measurements of noninteracting companion.
In globular cluster NGC 3201 . Companion is 0.8M ☉ main sequence turn-off .
[ 2] [ 8]
GRO J1719-24 / GRS 1716−249
≥4.9
8,500
K0-5 V
Near-infrared photometry of companion and Eddington flux .
LMXB system.
[ 2] [ 9]
4U 1543-47
5.0+2.5 −2.3
30,000 ± 3,500
A2 (V)?
Spectroscopic radial velocity measurements of companion.
SXT system.
[ 2] [ 10]
XTE J1650-500
≥5.1
8,500 ± 2,300
K4V
Orbital resonance modeling from QPOs
Transient binary X-ray source
[ 11] [ 12]
GRO J1655-40
5.31± 0.07
<5,500
F6IV
Precision X-ray timing observations from RossiXTE .
LMXB system.
[ 13] [ 14]
GX 339-4
5.9± 3.6
26,000
N/A
[ 2]
See also
References
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^ Paul Sutter last updated (2022-09-16). "Strange quark star may have formed from a lucky cosmic merger" . Space.com . Archived from the original on 2023-03-23. Retrieved 2023-03-30 .
^ Giesers, B; et al. (2018). "A detached stellar-mass black hole candidate in the globular cluster NGC 3201" . Monthly Notices of the Royal Astronomical Society: Letters . 475 (1): L15–L19. arXiv :1801.05642 . Bibcode :2018MNRAS.475L..15G . doi :10.1093/mnrasl/slx203 . S2CID 35600251 .
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^ Orosz, Jerome A.; Jain, Raj K.; Bailyn, Charles D.; McClintock, Jeffrey E.; Remillard, Ronald A. (2002). "Orbital Parameters for the Soft X-Ray Transient 4U 1543-47: Evidence for a Black Hole". The Astrophysical Journal . 499 (1): 375–384. arXiv :astro-ph/9712018 . Bibcode :1998ApJ...499..375O . doi :10.1086/305620 . S2CID 16991861 .
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