The object is “only” 400 light years from Earth. According to the WM Keck Observatory in Hawaii, CWISE J1249 is the closest hyperfast star to our planet.
Mass is also a fascinating feature for researchers. CWISE J1249 is the first object to be discovered with a mass similar to or less than that of a small star. The low mass, according to the study, makes it difficult to classify. “It could be a low-mass star or, if it didn’t always fuse hydrogen in its core, it would be considered a brown dwarf, putting it between a gas giant planet and a star,” explained the research.
Brown dwarfs are objects larger than a planet, but they are not massive enough to be considered stars. According to the Institute of Physics at USP (University of São Paulo), the mass of a brown dwarf is between 13 and 80 times greater than the mass of Jupiter, which, in turn, is 316 times heavier than Earth, the largest planet in the universe. -world. solar system. On the surface of a brown dwarf, the temperature usually varies between -173 and 3,400ºC. To the naked eye, the hottest brown dwarfs are orange or red in color, while the coolest are magenta in color.
The composition of the item is considered unique. According to data from the WM Keck Observatory, CWISE J1249 has less iron and other metals than other stars and brown dwarfs.
This unusual composition indicates that CWISE J1249 is very old, possibly from one of the first generations of stars in our galaxy. An excerpt from the survey that describes how the item was found
Why is the object moving so fast?
There are two hypotheses for this. One is that it would have originally formed from a binary system, together with a white dwarf, resulting in a supernova (explosion of a star) by ingesting a large amount of material from the other body present in the system. See below the simulation prepared by the University of California for this situation:
2024-08-24 19:00:00
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