What is HR 6819?
[[File:HR 6819.jpg|250px|right]] '''HR&nbsp;6819''', also known as '''HD&nbsp;167128''' or '''QV&nbsp;Telescopii''' (abbreviated '''QV&nbsp;Tel'''), is a triple [[star system]] in the southern [[constellation]] of [[Telescopium]], near the southern constellation boundary with [[Pavo (constellation)|Pavo]].<ref name=Hiltner1969>{{cite journal | display-authors=1 | last1=Hiltner | first1=W. A. | last2=Garrison | first2=R. F. | last3=Schild | first3=R. E. | title=MK Spectral Types for Bright Southern OB Stars | url=https://archive.org/details/sim_astrophysical-journal_1969-07_157_1/page/313 | journal=[[The Astrophysical Journal]] | volume=157 | pages=313 | date=July 1969 | doi=10.1086/150069 | bibcode=1969ApJ...157..313H }}</ref> It is located at a distance of about 1,120&nbsp;[[light year]]s from the [[Sun]], and is drifting farther away at a rate of +15&nbsp;km/s. A May 2020 study reported it to contain a [[black hole]], making it the closest known black hole, and the first one located in a stellar system visible to the naked eye.<ref name=Rivinius2020>{{cite journal | last1=Rivinius| first1=Th. | last2=Baade | first2=D. | last3=Hadrava | first3=P. | last4=Heida | first4=M. | last5=Klement | first5=R. | title=A naked-eye triple system with a nonaccreting black hole in the inner binary | journal=Astronomy & Astrophysics | volume=637 |number=L3 |pages=11 | year=2020 | doi=10.1051/0004-6361/202038020 | arxiv=2005.02541| bibcode=2020A&A...637L...3R | s2cid=218516688 }}</ref> ==References== {{reflist}} [[Category:May 2020 events]] [[Category:Triple star systems]] [[Category:Black holes]] {{sci-stub}}