TROJANS ASTEROIDS WILL IMPACT THE EARTH IN 2021 SAFE LOCATIONS PART 1 PLEASE SHARE
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Jupiter is by far the largest and most massive planet in the solar system. And befitting a world named for the Roman king of the gods, Jupiter has an impressive entourage. It includes a set of faint and dusty rings, 67 known or suspected moons, and two swarms of asteroids that precede and follow the planet in its orbit. These last are the Trojan asteroids.
For all we’ve discovered about Jupiter, its moons, and even its gossamer rings, we know precious little about the Trojans. Pioneers 10 and 11, the two Voyagers, Galileo, and Juno have all returned a wealth of data about the jovian system. Until now, though, the only way to study the Trojans has been from afar, with ground-based and Earth-orbiting telescopes.
That’s about to change. In 2017, NASA gave the go-ahead for a new Discovery-class robotic mission set for launch in 2021. The space probe will visit and explore six different Jupiter Trojans — and a main belt asteroid for good measure. So little is known about the Trojans that the data will certainly revolutionize our understanding of these ancient bodies. What the spacecraft uncovers could confirm some current theories of the solar system’s early evolution — or turn it all upside down.
There are currently over 4,800 known Trojan asteroids associated with Jupiter. About 65% of these belong to the leading group (L4) located 60o in front of Jupiter in its orbit, while the other 35% cluster around the L5 Lagrangian point and trail 60o behind Jupiter. Although their orbits are stabilised at the Lagrangian points by gravitational interactions with Jupiter and the Sun, their actual distribution is elongated along the orbit. Perturbations by the other planets (primarily Saturn) cause the Trojans to oscillate around L4 and L5 by ∼20° and at inclinations of up to 40° to the orbital plane. These oscillations generally take between 150 and 200 years to complete.
Such planetary perturbations may also be the reason why there have been so few Trojans found around other planets. In particular, we assume that the Trojans formed at their present positions at the same time as Jupiter emerged from the solar nebula. If this is correct, we would also expect Saturn to be accompanied by families of Trojan asteroids. That no Trojans are found at the Lagrangian points of Saturn is most likely the result of Jupiter removing them from these stable orbits through gravitational perturbations.
The term ‘Trojan asteroid’ was coined when it was decided to name all asteroids discovered at the L4 and L5 points of Jupiter after warriors in the Trojan war, Greek and Trojan respectively. The exceptions are Hector (a Trojan spy in the Greek camp) and Patroclus (a Greek spy in the Trojan camp), the first two Trojan asteroids discovered and named before the two camps were established.
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