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Showing posts with label asteroids. Show all posts
Showing posts with label asteroids. Show all posts

June 5, 2012

Asteroids conducted with an alien force threatening the Earth


In the second half of this century, could approach the Earth and asteroids hitting the planet, and there are "plenty" of dangers of this kind, concluded a recent study by U.S. scientists.

At the same time, it is extremely difficult to calculate the trajectory of potentially hazardous asteroids because of a strange effect that can distort the path of the asteroid.The phenomenon is known as 'Yarkovsky effect' by the name of a Russian engineer Ivan Yarkovsky, the scientist who first predicted the phenomenon in 1900.

In the past 12 years, this phenomenon led to deflect an asteroid from its path about 100 miles, a figure not very significant for the huge space, but very important for the Earth. "It is important to understand this process and how it impacts on the asteroid to determine whether the celestial body will collide with our planet or not," says Josh Emery, University of Tennessee at Knoxville.

The effect is that the thermal radiation from the asteroid surface creates a weak pulse celestial body that gives an additional acceleration.Noting with NASA telescope to the asteroid 1999 RQ36, a small diameter of only a mile and would have to pass by Earth in 2135, scientists determined that the intensity of the 'Yarkovsky effect' depends on the surface of celestial body.

If the stone surface is a dense, then the heat is maintained for longer and, therefore, an enhanced phenomenon of thermal radiation. But if the surface is made up of dust or sand is then cooled much more quickly, which means that the 'Yarkovsky effect "will be lower, ie the lower the path deviation.Meanwhile, experts say the difficulty is that the asteroids are not divided strictly on sandy or stone materials. Its surface is different.

Furthermore, it is almost impossible to measure the effect somewhat, scientists emphasize in their article.However, knowledge about this phenomenon, together with data on the size, thermal properties and orbit, helped scientists determine the mass and density of the asteroid 1999 RQ36, which is located at a distance of several million miles from Earth. Proved to have the density of water and a structure as the foam.

Based on experience, astrophysicists hope to again assess the degree of threat to our planet by asteroids in the years 2170-2190. Moreover, if it is carried out successfully the U.S. mission OSIRIS-Rex in the next decade, scientists hope to receive more information about this topic.

This mission provides the launching interplanetary station of the same name in 2016, and his landing on the asteroid 1999 RQ36 in 2019. The unit will take soil samples and will have to return to Earth in 2023.

April 18, 2012

Astronomers discovered the asteroid 2012 HM who comes to Earth in April


The recently discovered asteroid 2012 HM neighbor happen to the Earth 1.5 times the distance of the Moon on April 28, reports the Program report Near Earth Objects (NEO) of NASA.

The object will pass 576 000 km from Earth at a sufficient distance that could eventually be affected by the gravity of the Earth or Moon.Its closest approach to the moon will be 375,000 miles the morning of April 28 after an hour and will approach the Earth to move away quickly.

The asteroid 2012 HM is about 50 to 100 meters and traveling at a speed of 6.44 km / s.The NEO studied by space objects, comets and asteroids are driven by the gravitational pull of planets in close orbits that allow them to enter the vicinity of Earth.

They are composed mainly of water ice with embedded dust particles.While comets are formed in the cold outer planetary system, most of the rocky asteroids have formed in a zone warmer inner solar system between the orbits of Mars and Jupiter.

The scientific interest in comets and asteroids is that they are a remnant material that has not undergone major changes in the process of formation of the solar system some 4.6 billion years.

One hypothesis is that the giant outer planets comoJúpiter, Saturn, Uranus and Neptune formed from an agglomeration of billions of comets and the remnants of this formation process are the comets we see today.
From this perspective posed by NEOs, asteroids today are the pieces left over from the initial agglomeration of the inner planets, including Mercury, Venus, Earth and Mars.

"Comets and asteroids offer clues to the chemical mixture from which the planets formed some 4.6 billion years. If we know the composition of the primordial mixture from which the planets were formed, then we must determine the chemical components of the remaining remnants of this formation process, comets and asteroids, "says NASA.

April 11, 2012

The threat of asteroid 99942 Apophis


The Russian Academy of Sciences just issued a report suggesting the sooner send a satellite equipped with a beacon to the asteroid 99942 Apophis, considered the most dangerous for the Earth and whose orbit will take you to pass very close to our planet in the years 2029, 2036 and 2068.

The mission objective is none other than find out, no doubt, once and for all, the actual level of threat this space rock about 300 feet in diameter is for us. "From the technical point of view, the mission could be ready for deployment in 2015," said the statement from the Academy.

Apophis will pass in April 2029, only 29,450 km. of the earth. Discovered in 2004, will hold its first "pass" by Earth next April 13, 2029, at a distance of only 29,450 km, representing a record of close to these objects. However, this first visit will be harmless and the risk of impact for that year, although there would be negligible.

The problem comes later. In fact, astronomers know that, precisely because of its proximity aa at that time, the asteroid's trajectory will be affected by the force of gravity. This could lead to an impact for any of the following two visits.

The point is that in the absence of accurate data, it is not possible to make accurate estimates. In other words, we still do not really know how dangerous this asteroid.

In its latest estimate, released in October 2009, NASA stood at 250,000 a probabbilidades impact of Apophis hitting the Earth for 2036, and 333.000 for its passage in 2068. However, NASA itself believes that these estimates may not be subject to the availability of data on the asteroid's approach in 2029.

Sending a satellite will serve to dispel doubts. According to the report of the Russian Academy, sending a satellite to the asteroid will serve to dispel doubts and calculate the exact path of the asteroid. The instruments could, once known to detail their orbital data, make predictions much more reliable for the next meeting and clarify what the real possibilities of impact for 2036.

Other investigators have previously proposed space missions for the same purpose. One, which was never implemented, was to place scientific equipment directly on the surface of the asteroid, which would monitor the data continuously. The mission now proposed by Russia, however, has the advantage of being much cheaper and easier from the technical point of view.

With a size which triple that of a football field, Apophis is, however, a small asteroid, especially compared to bodies like Ceres, which has nearly a thousand miles. in diameter.

However, a direct impact with Earth would be capable of causing severe damage, especially if they occur in densely populated areas. Suffice to say that the energy released would be equivalent to tens of thousands of atomic bombs.

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