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"It seems like it's been hiding in plain sight," astronomer Kareem El-Badry, a Ph.D. student at the University of California, Berkeley, who wasn't involved with the study, told National Geographic. HR 6819: History of a Mystery. Our. The HR 6819 black hole is similar in size to ones found in the Milky Way, which is about 25 million light-years from Earth's solar system in the constellation Canes Venatici, according to researchers. 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HR 6819 HR 6819 Location of HR 6819 (red circle) in the SW corner of the southern constellation of TelescopiumObservation data Epoch J2000.0 HR 6819 (bl.a. A massive black hole, four times the size of the Sun has recently been discovered by researchers who say it can even been seen with the naked eye on clear nights, The Daily Star's FREE newsletter is spectacular! Astronomers have spotted only a couple of dozen black holes in our galaxy to date, nearly all of which strongly interact with their environment and make their presence known by releasing powerful X-rays. The HR 6819 triple system, ... My observation, a 4.2 solar mass BH has a diameter of 1.6582E-7 AU and angular size of 5.4E-10" at 307 pc distance or 1,000 light-years. The never-before-seen black hole is in a galaxy far, far away called Messier 87. It was found in a system called HR 6819, in the constellation Telescopium. Find out more about Croatia, watch live streams from croatian cities and browse a directory of croatian webpages. This artist’s impression shows the orbits of the objects in the HR 6819 triple system. Research co-author Petr Hadrava, Emeritus Scientist at the Academy of Sciences of the Czech Republic in Prague, said: "We were totally surprised when we realised that this is the first stellar system with a black hole that can be seen with the unaided eye.". From the earliest spectra of HR 6819, scientists identified this source as a bright, early-type Be star â a hot star with emission lines, likely due to the accretion of a circumstellar disk of material. Observations made by Gies and his team also suggested that the Be star, which was initially detected by searching for light from its disc at certain wavelengths, was actually of â¦ After HR 6819's black hole, the nearest known black hole is about 3,000 light-years away from Earth in the constellation Monoceros. Sign up today for the best stories straight to your inbox. The Schwarzschild radius (event horizon) of a black hole is sometimes thought of as the black holeâs âsizeâ. But there could still be others lurking even closer still to be uncovered. 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Get Me Out Of Here! Other stargazers were buzzing about the major discovery that could give astronomers their best chance at unlocking the mysteries of the galactic phenomenon. It is proportional to mass, which means that more massive black holes have bigger Schwarzschild radii. HR 6819: History of a Mystery. Located near the center of that galaxy, it's about 53 million light-years from Earth. HR 6819 likely started its life as a triple star system before the third star collapsed into the black hole it is today.