Asteroid 2012 TC4 to safely flyby Earth on October 12, 2017


A small Apollo-class asteroid named 2012 TC4 will safely flyby Earth at 06:07 UTC ( ± 02:51) on October 12, 2012.

This asteroid has not ben seen since it was discovered in October 2012, when it flew past Earth at about 0.25 LD (¼ the distance from Earth to the Moon), so it's difficult to know how close it will pass us this time. However, as it starts to approach us this summer, large telescopes will be used to re-establish its precise trajectory and narrow the uncertainty.

"We know the orbit of 2012 TC4 well enough to be certain that it won’t hit Earth," said Paul Chodas, manager of the Center for Near-Earth Object Studies (CNEOS), at NASA’s Jet Propulsion Laboratory.

During the close approach on October 12, the space rock will pass no closer than 6 800 (4 200 miles) from our planet, and more likely much farther away, as far as 270 000 km (170 000 miles) or two-thirds of the distance from Earth to the Moon.

Based on what we currently know, this is an Apollo-class asteroid with an estimated size between 10 and 30 meters (30 to 100 feet). For comparison, the asteroid that hit Earth’s atmosphere near Chelyabinsk, Russia, in February 2013 was roughly 20 m (70 feet) across.


Asteroid 2012 TC4 at Minor Planet CenterCNEOS

Featured image credit: The green line indicates the object's apparent motion relative to the Earth, and the bright green marks are the object's location at approximately one hour intervals. The Moon's orbit is gray. The blue arrow points in the direction of Earth's motion and the yellow arrow points toward the Sun. Credit: Minor Planet Center.

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One Comment

    Un Géocroiseur de petite taille va passer à proximité de la Terre à une distance de 44.000 km le jeudi 12 octobre 2017 soit dans peu de temps, il est sans danger au vu de sa longueur (10 à 30 mètres), de son hypothétique masse et de sa composition chimique, nous ne savons pas encore si il composé de roche ou de minerai de fer. Faute de renseignement, je ne suis pas en mesure de vous donner la masse M de l’Astéroïde et la vitesse relative Vr du Géocroiseur. Si ce géocroiseur avait percuté la Terre, quelles en auraient été les conséquences ? L’Energie cinétique du Géocroiseur = 1/2MVr² aurait été convertie en une explosion sur Terre de plusieurs MégaTonnes de TNT. Je vais faire des recherches sur la Toile pour connaître la masse M et la vitesse relative Vr du Géocroiseur. Nous pouvons dormir sur nos 2 oreilles, car cet Astéroïde refrôlera la Terre que dans plusieurs centaines d’années. La NASA a suivi 2012 TC4 dans sa trajectoire et doit connaître les 3 paramètres physiques fondamentaux qui nous intéressent au plus haut point :
    – Sa Masse M,
    – Sa Vitesse Relative Vr,
    – Sa composition physico-chimique.
    Nous avons vu antérieurement que le Géocroiseur APOPHIS provoquerait en cas de collision avec la Terre une explosion de 150 MégaTonnes de TNT. Soit une explosion dans un rayon 300 km, les vitres seraient brisées dans un rayon de 1000 km.
    Suite dans une rubrique L’ASTEROIDE 2012 TC4 VA FROLER LA TERRE LE JEUDI 12 OCTOBRE 2017 où j’indiquerai la Masse M et la Vitesse Vr et où je ferai le calcul de la puissance de l’hypothétique impact avec notre planète.

    Alain Mocchetti
    Ingénieur en Construction Mécanique & e Automatismes
    Diplômé Bac + 5 Universitaire (1985)
    UFR Sciences de Metz

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