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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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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
gary
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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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Old 31-12-2020, 04:38 PM
cannon_gray (Cannon Gray)
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The discovery of this black hole will help scientists find other similar objects in the Milky Way that do not interact with the external environment and therefore have not yet been noticed. Probably, some of them maybe even closer to the solar system.
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Old 31-12-2020, 11:42 PM
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Not cut-&-dried:
https://www.sciencealert.com/the-clo...-pair-of-stars

Cheers -
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Old 10-01-2021, 02:44 PM
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I wonder what was happening in the sky in the year 901 CE. I'm assuming this must have been visible?
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