Interstellar guest Moimoi arrived with one of the four nearest stars

In the past year astronomers have discovered an object that came to us with the other stars. For many eras and millennia in our humble Solar system was definitely a lot of interstellar visitors, but this was the first that we found. Moimoi is a thin, cigar-shaped comet that could come from almost anywhere from the nearest stars. However, scientists have identified four most probable source of the emergence of Muamua.

The scientific community announced the discovery of Moimoi at the end of 2017. By this time he was already heading out of the Solar system, rounding the Sun and disperse it. He had entered the Solar system at the speed of 25.5 km/s, but since moving much faster. In combination with the orbital eccentricity of 1.2, everything else is confidently says that he was born in another star system.

Whence came Muamua?

High speed leads to the fact that to catch Moimoi is impossible, therefore, to describe very difficult. Scientists first marked it as a comet, but no visible coma caused them to doubt. Earlier this year, however, the analysis of the path of its movement through space confirmed that it’s a degassed comet. It’s just a “low-activity comet.” We also almost sure that this is not a spaceship.

Scientists from the max Planck Institute used data from the ESA satellite “Gaia” to calculate the possible ways Muamua up to the nearest stars. The satellite “Gaia” is a stellar cartographer with information about seven million stars. Because the stars are drifting through space over time, it is impossible to draw a direct line from Namuamua to the point of origin. However, the team identified four stars, which lay very close to his path over the last few million years.

All four sources — dwarf stars. The one that is closest to the trajectory Moimoi called HIP 3757. It is a red dwarf in 81 light year from us. A million years ago it was just two light years from the way Muamua. The following HD 292249. It is a yellow dwarf like the Sun, which is 135 light years. He was a few years away from the projected path Moimoi 3.8 million years ago. Two other stars had potential clash with Moimoi 1.1 and 6.3 million years, but were not as close as the first two.

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