Can an asteroid collide with Earth?

Starry Story directed by Jo Jung-je (5) June 30, Asteroid Day

23,000 asteroids near Earth
Of these, 2,100 are “global threats”.
A meteorite fell in Jinju in 2014
Apophis near Earth in 2029

A star is called a star in English, but there is a joke that a star is called a star because it burns by itself and emits light. In the celestial sphere, the stars rise in the east, rise in the south and fall in the west, this is called the diurnal movement. It is day and night training.

Like a star, it moves south and southwest along the ecliptic (the path along which the Sun moves), stops abruptly, turns around (backwards), returns there where it was going (uphill), then slowly and quickly moves forward. . This is called a planet. These movements follow Kepler’s third law. The law of elliptical orbit, which is slow at aphelion and fast at perihelion, but the region swept by an imaginary line connecting the planet and the Sun at the same time is still the same as the law of region velocity constant, the square of the orbital period of the planet is the cube of the principal radius. It is the law of harmony which corresponds to

◇ Asteroid Day = Planets do not burn on their own, but reflect sunlight and resemble the moon to us. The planets are retrograde because their orbits around the sun are different. When the Earth passes planets in extraterrestrial orbits, it is retrograde and prolific. Saturn rises from the east around 11:00 p.m., Jupiter rises at 12:50 a.m., Mars rises at 1:30 a.m., and Venus rises at 3:10 a.m. At 4:30 a.m. on the 16th there was a blending of the five planets, Mercury, Venus, Mars, Jupiter and Saturn, visible 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. Ringed mostly as a belt between Mars and Jupiter, the Trojan asteroid belt is located 60 degrees in front and behind the Sun of all planets except Saturn. Jupiter’s Trojan Belt is greater than the number of asteroids between Mars and Jupiter. It is divided into rock type, mineral type, and mixed rock and mineral type.

▲ Asteroids 243, 433 Eros, 253 Matilda, clockwise from top left image. Citizen Journalist Jo Jung Jae

Jato de ar = On June 30, 1908, at approximately 7:17 a.m., an asteroid exploded in mid-air near the Tunska River in present-day Siberia, Russia. The explosion 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. Eyewitnesses said at the time: “Although I was on a train which was 450 km away, the train overturned due to a loud crash on the ground and a gust of wind.”

On the morning of February 15, 2013, over Chalovinsk, Russia, an object which flew from space released light and smoke brighter than daylight, hovered for 30 seconds, then exploded in the atmosphere. The shock wave crushed exterior walls and windows of the building within a radius of 100 km, injuring 1,500 people. The size of the asteroid is estimated at around 10 to 20 meters.

◇ collision = In the desert of Arizona, USA, is the Boehringer crater, which was formed about 50,000 years ago. In 1891 the US Geological Survey concluded it was a crater, but geologist and miner Daniel Boehringer was convinced it was the result of a meteorite impact. It is estimated around 20-45 AD.

In 2014, two meteorites crashed into Jinju and were the subject of debate.

Asteroid craters are rare on Earth as many have been lost due to crustal movement, erosion and weathering. There are many asteroid craters on rocky bodies in space, such as the moon.

The probability that an asteroid with a diameter of 1 km will collide with the Earth is once in 500,000 years, and a fairly large collision with a diameter of 5 km will occur once in 10 million years. years. The most recent impact, with a diameter of 10 km, was the impact from the Chicxulub crater in Mexico’s Yucatan Peninsula, which caused the third mass extinction of the Cretaceous 66 million years ago.

▲ Effects of an asteroid explosion above Tunska. The trees were down. Citizen Journalist Jo Jung Jae

◇ Follow = In 1998, the United States Congress officially began the task of preventing the threat of asteroid collisions by ordering NASA to track the orbit of asteroids with a diameter of one kilometer or more that could collide with the Earth. The United Nations has designated June 30 as International Asteroid Day in 2016 to draw international attention to an asteroid likely to collide with Earth.

Near-Earth asteroids can be divided into three categories. The asteroid Aten is an asteroid whose main radius is less than 1 astronomical unit. Except for a few celestial bodies among the discovered Aten groups, the apogee position is outside 1 AU. Apollo asteroids are asteroids with a radius greater than 1 AU, but crossing Earth’s orbit. Finally, the Amur asteroid is a large radius asteroid between the orbits of Earth and Mars and it can approach the Earth but has no risk of collision because its perihelion is outside 1 AU. There are about 23,000 near-Earth asteroids and about 2,100 asteroids threaten Earth.

◇ Name = 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 weather forecasting and a sundial, Hong Dae-young, who championed the heliocentric theory, Lee Won-cheol, the Korea’s first doctor of science who pioneered meteorologist astronomer Ar, and Choi Moo-sun, who invented gunpowder in the late Goryeo dynasty, He Jun, who compiled Donguibogam, Kim Jeong-ho , who created Daedongyeojido, and Seohosu, who laid the foundation of Mount Cheonmunyeoksan in the late Joseon Dynasty. This is because the discoverer has the right to be named.

Asteroid 46610 Besidouse is the French reading of asteroid B612, where the Little Prince lives. Also, if asteroid 46610 is converted to a hexadecimal number, it will become B612.

Exploitation failure = There are many minerals in some asteroids. The abundance of minerals in some regions of the Earth is due to past asteroid impacts. In “Don’t Look”, a comet about 10 km long attempts to change its orbit in preparation for its collision with Earth, but blinds it with a huge amount of minerals and fails to mine it , which means that the Earth will fail. are destroyed.

On April 14, 2029 (Korean time), an Empire State Building-sized asteroid about 370 meters in diameter passed into a geostationary satellite orbit about 37,000 kilometers from Earth at 6:46 a.m. The Ministry of Science and ICT planned the first asteroid exploration project in Korea, but the project fell through as it failed the initial feasibility study. It’s the first time in 20,000 years, but it was canceled due to budget issues.

After two explorations of the asteroid, Japan brought samples back to Earth. Space exploration is far from Japan. I propose to call the Ministry of Science and Technology so that our probe can go to the asteroid Apophis aboard the Nuri.

Citizen Journalist Jo Jung Jae (Professor of Astronomy)

This article was supported by the Local Newspaper Development Fund.

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