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Old 07-05-2020, 04:19 AM
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glenc (Glen)
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Astronomers discover black hole closer to Earth than any before

  • The black hole is tiny, only 40km in diameter
  • It is not close enough to swallow anything, but it is warping the orbit of its nearest star
  • Scientists estimate the black hole was violently born from a supernova 15 million years ago
  • The new black hole is part of what used to be a three-star dance in a system called HR6819.
  • The star QV Tel is magnitude 5.37 and 1120 light years away
  • Studies using the 2.2m telescope at La Silla Observatory in Chile reveal the inner of the two visible stars to be orbiting an unseen object every 40 days.
  • Presumed to be a black hole, this object has a likely mass of at least four times that or our Sun.
https://www.abc.net.au/news/2020-05-...-ever/12222154

Last edited by glenc; 07-05-2020 at 04:41 AM.
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Old 07-05-2020, 09:27 AM
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pfitzgerald (Paul)
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Thanks for sharing this Glen - I'll pass it on to the students in my School's Astronomy Club.

Paul
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Old 07-05-2020, 02:31 PM
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Robh (Rob)
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Fascinating! Thanks Glen.
Especially the prospect of these being quite common. That would add a bit more mass to the galaxy.

The naked-eye star QV Tel must be a very tight pair. The WDS catalogue doesn't have any components listed for it.

Regards, Rob
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Old 07-05-2020, 03:05 PM
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glenc (Glen)
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Wiki has just updated their entry for QV Tel to include the black hole
https://en.wikipedia.org/wiki/QV_Telescopii
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Old 07-05-2020, 04:45 PM
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The ESO press release here with additional detail :-
https://www.eso.org/public/news/eso2007/

The research paper, "A naked-eye triple system with a nonaccreting black hole in the inner binary", by Rivinius et. al. :-
https://www.eso.org/public/archives/...7/eso2007a.pdf
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