Epoch J2000.0 Equinox J2000.0
|Right ascension||18h 19m 21.63s|
|Declination||−25° 24′ 25.8″|
In 1999 a violent X-ray outburst revealed it to contain a black hole. At the time, it was considered to be the closest known black hole to Earth, at a distance of approximately 1,600 light-years (490 pc). Later observations showed it to be at least 15 times farther away.
- "Dramatic Outburst Reveals Nearest Black Hole". National Radio Astronomy Observatory. Retrieved 2008-08-30.
- 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 ≈ 1,600 light-years/500 pc."
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