Vulcanoïde
A vulcanoïde is a hypothetical Astéroïde which would occupy the zone dynamically stable which is spread out between 0,08 and 0,21 astronomical units of the Sun, well inside the Orbite of Mercure. It takes its name of hypothetical planet Vulcan, that the astronomers of XVIIIe sought to discover in order to explain the excess of Précession Périhélie of Mercury - that we now know to be an effect of the General relativity.
No vulcanoïde discovered, in spite of the many ones was beaten up to now, including the research undertaken by NASA using F-18 wheel to high-altitude and of the suborbital rockets Black Brant. This research is very difficult to undertake because of the solar dazzling. If there exist vulcanoïdes, it is believed that they do not exceed 60 km in diameter, cuts who would have been detected by research carried out up to now.
Nevertheless, the hope remains because the area of the solar system studied is gravitationally stable and all the other areas of the same kind are occupied by minor objects. Moreover, surface craterized with Mercury saturation indicates that a population of vulcanoïdes had to exist at the beginnings of the solar system.
The vulcanoïdes, if they exist, would form a subclass of the apohèle S.
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