Dimorphos is about 170 meters in diameter, orbits around 800 meters of Didymos and does not threaten us at all. At the time of the collision, it will be approximately 11 million km from Earth. The DART mission is primarily to check whether we are able to hit the asteroid with the vehicle sent from Earth and whether the asteroid will change course after the impact. NASA wants the speed of 23 thousand. km per hour a car the size of a car shifted Dimorphos, reducing its circulation time around Didymos by 10 minutes. Currently, Dimorphos orbits the larger asteroid in 11 hours and 55 minutes. A 10-minute reduction in this time will be recorded by ground-based telescopes.
A few weeks ago, the LICIACube satellite, which follows in its footsteps, separated from the DART mission. After the impact, LICIACube will accompany the Dimorphos-Didymos system and send us its photos, on the basis of which specialists will assess the effects of the collision. In addition, the Hera mission of the European Space Agency is scheduled to start in October 2024. Two years later, Hera will meet Dimorphos and make detailed measurements. As part of it, a miniature lander is to land on Dimorphosa.
There are billions of comets and asteroids in the solar system. A small part of them are NEO (near-Earth object), i.e. near-earth objects. An object whose perihelion – the orbit point closest to the Sun – is less than 1.3 AU is considered NEO. The Astronomical Unit (I) is the distance between the Earth and the Sun, it is 150 million km. This is because 1.3 AU from the Sun means that such an object can be 0.3 AU (45 million km) from Earth.
We currently know (as of September 21 this year) 29 801 NEO. It is recognized that asteroids with a diameter greater than 20 m can, if they fall into the Earth’s atmosphere, cause serious local damage. Of course, the bigger the asteroid, the more dangerous it is for us. Asteroids with a diameter of more than 140 m are considered very dangerous, and asteroids with a diameter of more than 1 km can cause a catastrophe on a global scale.
Among all the NEO known to us, there are 10,199 objects with a diameter of over 140 m and 855 with a diameter of more than a kilometer. Experts believe that we know almost all NEOs with a diameter of more than a kilometer. We also know that in the next 100 years no such object will threaten the Earth. However, defense scenarios are already being prepared.
For if we could detect such a large object and study its orbit showed that it would probably hit the Earth, we would need decades to defend ourselves. If we wanted to change the route of such an object, then taking into account its enormous mass, we already know that the vehicle sent from Earth, hitting the asteroid, would only slightly change its trajectory. A collision would therefore have to take place decades before the expected impact on Earth, for this minimal change to accumulate over time and for the asteroid to bypass our planet.-
There will be some really big NEOs near Earth this year. The first will be the asteroid 2022 RM4, 330-740 m in diameter, which will fly 2.3 million km from us on November 1. Three weeks later, 2019 QR1 with a diameter of 180-410 m will be three times as far from the Earth, and on December 2 and 3, objects with a diameter of 320-710 m and 150-330 m will fly by at a distance of about 5 million km, respectively.
As for asteroids with a diameter of more than 1 km, we will have two such meetings in the next 12 months. On February 16, 2023, an asteroid 199145 (2005 YY128) with a diameter of 570-1300 meters will be approximately 4.5 million km from Earth, and on April 13, 436774 (2012 KY3) with a diameter of 540-1200 meters will pass us at a similar distance. We have to wait until September 2, 2057 for the visit of a real giant. Then, at a distance of 7.5 million km, we will be passed by speeding 48 492 km per hour. asteroid 3122 Florence with a diameter of 4.9 km.
Date Created: Today, 13:09
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