23,000 asteroids near Earth
Of these, 2,100 are “global threats.”
A meteorite fell on Jinju in 2014
Apophis near Earth in 2029
A star is called a star in English, but there is a joke that says a star is called a star because it burns on its own and emits light. In the celestial sphere, stars rise in the east, rise in the south, and fall in the west, this is called diurnal motion. It is a day and night workout.
Like a star, it moves south and southwest along the ecliptic (the path the Sun travels), stops abruptly, goes back (back), back to where it was going (ascends), and then it moves slowly and fast. . This is called a planet. These motions follow Kepler’s third law. The law of elliptical orbit, which is slow to aphelion and fast to perihelion, but the region swept by an imaginary line connecting the planet and the Sun at the same time is always the same as the law of velocity. of the constant region, the square of The orbital period of the planet is the cube of the main radius. It is the corresponding law of harmony
◇ Asteroid Day = The planets do not burn by themselves, but reflect the light of the sun and look like the moon. Planets are retrograde because their orbits around the sun are different. When the Earth passes through planets in extraterrestrial orbits, it is retrograde and prolific. Saturn rises from the east at about 23:00, Jupiter at 0:50, Mars at 1:30, and Venus at 3:10. At 4:30 a.m. on the 16th, there was a mixture of the five planets, Mercury, Venus, Mars, Jupiter, and Saturn, which could be seen until the end of June. During the rainy season, the weather can only be seen when the weather is clear.
June 30 is Asteroid Day. Small, irregular bodies such as potatoes or sweet potatoes that are not spherical are called asteroids. Surrounded primarily like a belt between Mars and Jupiter, the Trojan asteroid belt lies 60 degrees forward and backward from the Sun of all planets except Saturn. Jupiter’s Trojan belt is more than the number of asteroids between Mars and Jupiter. It is divided into rock type, mineral type and mixed rock and mineral type.
◇ Air jet On June 30, 1908, at about 7:17 a.m., an asteroid exploded in the air near the Tunska River in present-day Siberia, Russia. The blast destroyed 2,150 square kilometers of forest, the equivalent of 60 to 80 million trees. In the devastated forest, the carcasses of 1,500 reindeer and fallen trees were found. At the time, eyewitnesses said: “Although it was on a train that was 450 km away, the train overturned due to a loud noise on the ground and a gust of wind.”
On the morning of February 15, 2013, an object that flew from space over Chalovinsk, Russia, released light and smoke brighter than daylight, floated for 30 seconds, and then exploded into the atmosphere. . The crash hit the building’s exterior walls and windows within a 100km radius and injured 1,500 people. The size of the asteroid is estimated to be about 10 to 20 meters.
◇ collision = In the Arizona desert, USA, is the Boehringer crater, which formed about 50,000 years ago. In 1891, the US Geological Survey concluded that it was a crater, but geologist and miner Daniel Boehringer was convinced that it was the result of a meteorite impact. It is estimated to be around 20-45 AD.
In 2014, two meteorites crashed into Jinju and became the subject of debate.
Asteroid craters are rare on Earth because many of them have been lost due to crustal motion, erosion, and weathering. There are numerous asteroid craters in rocky bodies in space, such as the moon.
The probability of an asteroid 1 km in diameter colliding with Earth is once every 500,000 years, and a fairly large collision with a diameter of 5 km occurs once every 10 million years. The most recent impact, with a diameter of 10 km, was the impact of the Chicxulub crater on the Yucatan Peninsula in Mexico, which caused the third mass extinction of the Cretaceous 66 million years ago.
◇ track = In 1998, the United States Congress officially began tasked with preventing the threat of asteroid collisions by ordering NASA to track the orbits of asteroids one kilometer or more in diameter. they could collide with the Earth. The United Nations designated June 30 as International Asteroid Day in 2016 to draw the attention of the international community to an asteroid that is likely to collide with Earth.
Asteroids close to Earth can be divided into three categories. The asteroid Aton is an asteroid with a main radius of less than 1 astronomical unit. With the exception of a few celestial bodies among the discovered Athenian groups, the apogee position is outside 1 AU. Apollo asteroids are asteroids with a radius greater than 1 AU, but which cross Earth’s orbit. Finally, the asteroid Amur is an asteroid with a long radius between the orbits of Earth and Mars and can approach Earth but has no risk of collision because its perihelion is outside 1 AU. There are about 23,000 asteroids near Earth and about 2,100 asteroids threaten the Earth.
◇ Nom The International Astronomical Union (IAU) announced the names of the new asteroids on June 11, 2021 and includes the names of the astronomers, including six Koreans. Choi Young Joon, Jung In Young Min, Yang Hong Gyo, Kim Myung Jin, Kim Yoon Young, Moon Hong Gyo. Among the 120 asteroids discovered by astronomer Dr. Jeon Young-bum, Jang Young-sil, who invented the weather forecast, and a sundial, Hong Dae-young, who defended the heliocentric theory, Lee Won-cheol, the first pioneering Korean doctor of science in meteorological astronomer Ar, and Choi Moo-sun, who invented gunpowder at the end of the Goryeo dynasty, He Jun, who compiled Donguibogam, Kim Jeong-ho, who created Daedongyeojido, and Seohosu, who lay the foundations of Mount Cheonmunyeoksan at the end of the dynasty. Joseon. This is because the discoverer has the right to be named.
Asteroid 46610 Besidouse is the French reading for asteroid B612, where the Little Prince lives. Also, if asteroid 46610 becomes a hexadecimal number, it will become B612.
Exploitation failure = There are many minerals in some asteroids. The abundance of minerals in certain regions of the Earth is due to past asteroid impacts. In “Don’t Look”, a comet about 10 km long tries to change its orbit in preparation for its collision with Earth, but blinds it with a large amount of minerals and fails to extract it. which means the Earth will fail. they are destroyed.
On April 14, 2029 (Korean time), an asteroid the size of the Empire State Building about 370 meters in diameter passes through a geostationary satellite orbit about 37,000 kilometers from Earth at 6 o’clock: 46 in the morning. The Ministry of Science and ICT planned the first asteroid exploration project in Korea, but the project failed because the initial feasibility study failed. This is the first time in 20,000 years, but it was canceled due to budget issues.
After two asteroid explorations, Japan brought samples to Earth. Space exploration is far from Japan. I suggest calling the Ministry of Science and Technology so that our probe can go to the asteroid Apophis aboard the Nuri.
Citizen Reporter Jo Jung Jae (Professor of Astronomy)
This article was supported by the Local Newspaper Development Fund.
Copyright Holders © Gyeongnam Provincial Daily Newspaper Unauthorized Reproduction and Redistribution Prohibited