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The celestial bodies in the universe have countless postures. (Image source: Adobe Stock)
A family close to the earthcelestial bodyAttracting the attention of scientists, it was initially thought to becometbut its characteristics are different. Some people think it is aasteroidit has also been suggested that it is aalienaircraft point of view.
Is it an asteroid or a UFO? Eye-catching celestial objects pass by Earth
On October 18, 2017, the Pan-STARRS 1 telescope discovered an object 30 million kilometers away from the Earth. The object was orbiting in a hyperbolic orbit and was the first known interstellar object to pass through the solar system.
At first, scholars thought it was a comet. However, as time passed, they discovered that it was different from the comet they knew. Through the Very Large Telescope in the Atagama Desert in Chile, it was discovered that this celestial body did not show any signs of coma. Therefore, its identity was changed from a comet to an asteroid, and it was renamed “A/2017 U1”. A precedent for the permanent renaming of a comet to an asteroid.
At that time, the William Herschel Telescope observed the spectrum of A/2017 U1 and found that it appeared red, like a Kuiper belt object located outside the orbit of Neptune in the solar system. If calculated based on the albedo data of 10%, it is estimated that it may be a rock object with a diameter of 160 meters.
According to the observation results of the original two weeks, the orbital eccentricity of this celestial body was the second highest among known celestial bodies in the solar system at that time. This result means that it will not be constrained by the gravity of the sun and can leave the solar system with a high eccentricity. An interstellar object. Backward orbit calculations show that A/2017 U1 passed perihelion on September 9 and will pass by the Earth on the 14th of the following month. At this time, its distance from the Earth is 24 million kilometers. After passing perihelion, it will fly in the direction of Pegasus. According to calculations by the Jet Propulsion Laboratory, a hundred years ago, this celestial body was about 83 billion kilometers away from the sun.
This celestial body is called the “Scout Star”, and its true identity is still controversial. Although it is classified from a comet to an asteroid as mentioned above, many telescopes have measured its orbit and found that the Scout Star will be affected by the sun and planets. , the force caused by the release of gas and dust. The reason why there is no coma may be that its origin is outside the freezing line of a certain star, or it has stayed in the area outside the star system for long enough, causing the material close to the surface to freeze into ice.
Abraham Loeb, an American-Israeli astrophysicist, put forward an interesting point of view. He believes that the Scout Star is actually an alien aircraft that uses a “light sail” to sail. Therefore, the Scout Star is also regarded as a member of the UFO. .
Source: Look at China
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