The 12 of August return the rain from stars of the Perseidas
This summer the well-known star rain popularly as Perseidas or Lágrimas of San Lorenzo has its maximum of activity the 12 of August, between the 19,30 and 22,00 hours (hour peninsular), being able to get to be observed up to 200 fleeting stars in one hour. The Moon enters its phase of last quarter the 13 of August, reason why it will make difficult to something the observation of the weakest meteors.
Scientifically, which we know as `stars fugaces' are not another thing that meteors: variable dust particles of size that the comets are leaving throughout their orbit while they turn around the Sun. Made up of ice and rocks, the nucleus of a comet is warmed up when it approaches a star (sublimation process), forming a weak atmosphere around the same, that receives the name of comma or hair. When the comet is come near to the Sun, the solar wind whips the comma and the characteristic tail is generated, that can get to reach lengths of million kilometers.
In counted occasions the circumstance that occurs the Earth makes contact with enemy with the orbit of a comet and the rest of particles lazy by this one are disintegrated when penetrating to in our atmosphere. The result is the calls star rains. In the tactical mission of the Perseidas, the Earth crosses the orbit of the Swift-Tuttle comet, that takes about 130 years in giving a return around the Sun and that made its last appearance in 1992.
Generally, meteor rains are baptized with the name of the constellation where is the radiating point: the point of the sky from which they seem to come meteors at the moment from the maximum of activity. In this tactical mission, the radiating point is located in the constellation of Perseo, of there the name of Perseidas.
One is one of more popular fleeting star rains due to his great activity but, mainly, to that one takes place in August, vacacional month par excellence. The first references to this rain we found them star about 2,000 years ago and come from east, where some Chinese observers already registered the phenomenon. Nevertheless, until century XIX this star rain was not related to the activity of a comet.
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