Interstellar guest Umuamua arrived with one of the four nearest stars
In the past, astronomers have discovered an object that has come to us from other stars. For many eras and millennia many interstellar visitors definitely appear modest in our solar system, but this was the first that we found. Umuamua - a thin cigar-shaped comet that could come from almost any of the nearest stars. However, scientists have identified four of the most probable source of the Umuamua.
The scientific community has announced the opening Umuamua at the end of 2017. By this time he was already heading out of the solar system, going around the Sun and dispersed with it. He entered the solar system at a speed of 25, 5 km / s, but since moving much faster. In combination with an orbital eccentricity of 1, 2, rest confidently says that he was born in another stellar system.
How come Umuamua?
High speed leads to the fact that it is impossible to catch Umuamua therefore characterize quite difficult. The researchers first labeled it as a comet, but the lack of visible coma caused them to doubt. Earlier this year, however, the analysis of the path of its motion through space has confirmed that this degassed comet. It's just "inactive comet." We are also pretty sure that this is not a spaceship.
Scientists from the Max Planck Institute have used ESA satellite data "Gaia" to calculate the possible ways Umuamua up to the nearest stars. Sputnik "Gaia" - a star mapper data about seven million stars. Since the stars drift through space over time, it is impossible to draw a straight line from Umuamua to its origin point. Nevertheless, the team identified four stars that were very close to its path over the past few million years.
All four sources - dwarf stars. The one that is closest to the trajectory Umuamua, called HIP 3757. This is a red dwarf star 81 light-year away. A million years ago, he was just two light years from the way Umuamua. Next - HD 292249. It is a yellow dwarf star like the Sun, which is located 135 light-years. He was a few years from the projected path Umuamua 3, 8 million years ago. Two other stars had a potential clash with Umuamua 1, 1 and 6, 3 million years, but they were not as close as the first two.
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