Astronomers have identified a potential home first interstellar visitor
Visited last October our solar system space object, dubbed "Oumuamua" immediately attracted the attention of astronomers all over the world. Intruder found an automated telescope Pan-STARRS1. He had a cigar shape (because of what the debate began among scientists about what the object is) had dimensions of 228 by 35 meters, deep red color and was moving at very high speeds. One group of scientists even scan it for signs of the presence of intelligent life (of course, they found nothing).
The most important thing that attracted the attention of scientists, is its trajectory. Oumuamua moved through the solar system, not as another asteroid. His path lay between the orbit of Mercury and the sun. This led researchers to suggest that Oumuamua (that Hawaiian means "messenger from a distance, who had come first") is the first interstellar visitor, who visited our system.
A little later, astronomers have determined that the object is in fact not an asteroid, and "secondary active" comet. However, the mystery of his own system remained unsolved for researchers.
Using the most accurate for the time three-dimensional map of our galaxy, the astronomers identified four star systems, of which Oumuamua could fly to us. The discovery of cometary nature of the object, helped researchers get the first accurate data on the trajectory Oumuamua movement, making sure that both changed the manner of its flight through the solar system after its rapprochement with our star. These changes generated gases from the heated surface of the interstellar "spy" helped scientists calculate the exact direction of its movement. On the conclusion of researchers told the Journal of Astronomical Journal.
The trajectory through the solar system Oumuamua
His work, researchers began by analyzing unprecedentedly detailed maps of 1, 7 billion stars, compiled with the help of Gaia probe by the European Southern Observatory and published in April this year. This is the second publication with Gaia probe data from the moment of the launch vehicle in December 2013.
On this map indicated not only the position of the stars. With this map, astronomers can also determine the speed and direction with which stars move relative to us.
After that, scientists have counted all the stars are at a distance of about 2 parsecs (6, 5 light years) from the line along which the comet was moving in the direction of the Earth and the Sun, and have calculated the conditions under which she would be able to leave this star system.
In total, the trajectory Oumuamua crosses the neighborhood of 28 stars, but only four of them, as the calculations of astronomers, able to generate an object the size of a Oumuamua moving at the correct speed.
According to researchers, the most likely birthplace Oumuamua is a red dwarf system HIP 3757 in the constellation Cetus. Star removed from Earth at 77 light years.
In addition, the list of potential candidates for the homeland Oumuamua included sun-like star system HD 292249, located away from us at a distance of 135 light-years away in the constellation Monoceros. According to the calculations of astronomers, on a trip to Earth from the HIP 3757 and HD 292249 comet would have spent about one million and four million years respectively. Two other potential candidates for the role of the family of stars, astronomers have identified Oumuamua 2MASS J0233 and NLTT 36959. One is the constellation Cetus, the other - the constellation of Virgo. One lies about 66 light-years, and the other - 300 light-years. The researchers note that these luminaries have properties similar to the sun or other yellow and orange dwarfs.
According to the researchers, none of these stars so far found planets or traces of the presence of small celestial bodies, which does not allow to say with certainty that one of them was indeed the birthplace Oumuamua in the distant past. At the same time, a sharp narrowing of the number of candidates for this role suggests some stars often give rise to such interstellar wanderers and how many of them may be present in the solar system.
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