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Home Science & Tech

DWARF PLANETS

April 23, 2020
in Science & Tech
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Context: There is a claim for the 6th dwarf planet Hygiea

  • As of today, there are officially five dwarf planets in our Solar System.
  •  The most famous is Pluto, downgraded from the status of a planet in 2006.
  •  The other four, in order of size, are Eris, Makemake, Haumea and Ceres.
  • The 6th one, called as Hygiea, has so far been taken to be an asteroid. It lies in the asteroid belt between Mars and Jupiter.
  • Using observations made through the European Space Organisation’s SPHERE instrument at the Very Large Telescope (VLT), astronomers have now found Hygiea may possibly be a dwarf planet. This is the first time astronomers have observed Hygiea in high resolution to study its surface and determine its shape and size.
  • VLT observations indicate that Hygiea satisfied all the conditions of a dwarf planet

The International Astronomical Union sets four criteria for a dwarf planet

  • it orbits around the Sun, 
  • it is not a moon
  • it has not cleared the neighbourhood around its orbit
  • it have enough mass that its own gravity pulls it into a roughly spherical shape

Other 

  • SPHERE( of European Space Organisation) is a powerful planet finder and its objective is to detect and study new giant exoplanets orbiting nearby stars using a method known as direct imaging — in other words, SPHERE is trying to capture images of the exoplanets directly, as though it were taking their photograph

 

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Tags: Prelims

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