V4641 Sagittarii

V4641 Sgr is a variable X-ray binary star system in the constellation Sagittarius. It is the source of one of the fastest superluminal jets in our galaxy.

In 1999 a violent outburst at V4641 Sgr revealed it to be the closest known black hole to Earth.^[1] Later investigation increased the distance estimate by a factor of 15. ^[2]

References

^ "Dramatic Outburst Reveals Nearest Black Hole". National Radio Astronomy Observatory. Retrieved 2008-08-30. {{cite web}}: Italic or bold markup not allowed in: |publisher= (help)
^ A Black Hole in the Superluminal Source SAX J1819.3-2525 (V4641 SGR), 2001: "Finally, we find a distance in the range 7.40 ≤ d ≤ 12.31 kpc (90% confidence), which is at least a factor of ≈ 15 larger than the initially assumed distance of ≈ 500 pc."

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[1] "Dramatic Outburst Reveals Nearest Black Hole". National Radio Astronomy Observatory. Retrieved 2008-08-30. {{cite web}}: Italic or bold markup not allowed in: |publisher= (help)

[2] A Black Hole in the Superluminal Source SAX J1819.3-2525 (V4641 SGR), 2001: "Finally, we find a distance in the range 7.40 ≤ d ≤ 12.31 kpc (90% confidence), which is at least a factor of ≈ 15 larger than the initially assumed distance of ≈ 500 pc."

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