Telescopes

Scheme of the orbits of 2015 RR245 and the objects brighter than it (Image courtesy Alex Parker, OSSOS)

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An international team of astronomers discovered the dwarf planet identified for now only as 2015 RR245. Using the telescope on Mount Maunakea, Hawaii, as part of the OSSOS survey, they found 2015 RR245, whose orbit is in the Kuiper belt, the area of ​​the solar system beyond Neptune where there are many icy celestial bodies.

The diameter of the dwarf planet 2015 RR245 has been estimated at around 700 kilometers (about 435 miles), which means it’s a bit smaller than Ceres. In the Kuiper belt there are 17 objects larger that that so this discovery is not at the level of that of a planet or at least of a dwarf planet the size of Pluto or Eris. However, each object discovered out there can tell us something more about the history of the solar system.

Artistic representation of the HD 131399 system with its exoplanet and its three stars (Image ESO/L. Calçada)

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An article published in the journal “Science” describes the discovery of the exoplanet HD 131399Ab, the first ever found in a system with three suns. A team of astronomers led by the University of Arizona used the SPHERE instrument mounted on ESO’s VLT to obtain a direct image of HD 131399Ab and its system’s three stars. Scientists thought that such an orbit was unstable but this case seems to contradict that idea.

Jupiter seen at infrareds with VLT (Image ESO/L. Fletcher)

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At the UK’s Royal Astronomical Society’s National Astronomy Meeting being held in Nottingham new images of the planet Jupiter were presented, obtained with the infrared VISIR instrument installed on ESO’s VLT. They will help better understand Jupiter’s atmosphere on the occasion of the arrival of NASA’s Juno space probe, scheduled for July 4, 2016.

Artist's impression of the simultaneous stellar eclipse with the planetary transit events by Kepler-1647b (Image Lynette Cook)

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An article published in “The Astrophysical Journal” describes the study of the planet’s characteristics circumbinary Kepler-1647b. By using the Kepler space telescope NASA, a team of scientists at NASA’s Goddard Space Flight Center and the San Diego State University led by Veselin Kostov discovered this planet that orbits two stars. This is not the first case of this kind but it’s the biggest and its year is longer, about three Earth’s years.