Made two notable discoveries in the inner regions of the Solar system: mercury has discovered an “impossible” ring of dust and Venus – the group of asteroids.
The remnants of the dust cloud from which the Solar system formed, small fragments scattered by collisions of comets and asteroids – all of this dust accumulates in some “gravitational angles” around the Sun, forming a sparse ring. This dust ring, filled with fragments of asteroids, it is along the Earth’s orbit. And two new articles (1, 2), published in The Astrophysical Journal, the scientists report their own ring mercury and asteroids in the orbit of Venus. “It’s not every day you find something new in the inner Solar system,” – emphasizes the astronomer mark Kuhner (Marc Kuchner), according to the Chronicle.info with reference to techno.bigmir.net.
Stenborg Guillermo (Guillermo Stenborg) and his colleagues at the Research lab, the U.S. Navy used data from a pair of twin satellites STEREO, leading observations of the Sun. For this kind of study is required in order to take into account the contribution of radiation reflected by surrounding the star with dust particles. Therefore, Stenborg with co-authors developed a model describing the motion of dust in the solar neighborhood. She showed that along the orbit of mercury accumulated dust ring density by around five percent higher than in the neighboring region.
Before this was considered not very likely: mercury is massive enough and is located too close to the Sun to retain the ring of dust. However, it is observed throughout the orbit. Scientists estimate that the width of a ring is more than 4,800 kilometers, far exceeding the diameter of mercury.
The authors of the second publication – mark Kuhner and Peter Humble from space flight Center. Goddard NASA – studied dusty ring of Venus. It is much more mercurial, reaching 25 million kilometers of height and nine million kilometers width, and density exceeding the surrounding region by 10 percent. The existence of a dust ring in the orbit of Venus was first shown back in 2007.
It was assumed that it, as dust on the Earth’s orbit, the debris are continuously colliding bodies from the asteroid belt. However, all attempts Kuhner and Submissive to simulate this process ended in failure: the attraction of the Earth “collecting” stream of dust from the asteroid belt, not allowing her to reach Venus orbit. This led the scientists to think about the different origins of the local dust and to simulate other possible scenarios.
As a result, they came to the conclusion about the presence in the orbit of Venus private source of dust, the group of asteroids orbiting the Sun together with the planet. Most likely, it is the large fragments remaining from the time of formation of Venus. Modeling showed that if in its orbit 4.5 billion years ago was at least 10 thousand of these asteroids, then to the present day they could be about 800. However, they have yet to find telescopes to confirm the accuracy of these – so far purely theoretical – results.