Scientists make dizzying planet find

Comment on this story


planet afp

AFP

This artist's view shows the planet orbiting the young star Beta Pictoris. This exoplanet is the first to have its rotation rate measured. AFP PHOTO / ESO - L. Calcada / N. Risinger

Scientists have for the first time measured the rotation of a planet in another solar system - a juvenile, gassy giant spinning at a breakneck 90,000 kilometres per hour, they reported on Wednesday.

Orbiting a star about 63 light years from Earth, Beta Pictoris b is more than 16 times larger and 3,000 times more massive than our planet, but its days last only eight hours.

“Beta Pictoris b spins significantly faster than any planet in the solar system” - at a rate of about 25 kilometres per second (90,000 kph or 56,000 miles per hour), a team of Dutch astronomers wrote in the journal Nature.

Jupiter's equator turns at about 47,000 kph and that of Earth at 1,700 kph.

The measurement, done with the European Southern Observatory's Very Large Telescope, echoes a trend observed in our own solar system of increasing spin velocity with higher planet mass.

This association would predict an even faster spin of about 50 kps for Beta Pictoris b, but the team noted the planet was still young and warm and would likely pick up speed as it cools and shrinks to the size of Jupiter in the coming hundreds of millions of years.

The planet orbits the star Beta Pictoris in the southern constellation of Pictor (The Painter's Easel).

Discovered nearly six years ago, it orbits its star at a distance eight times that of the Earth to the sun.

Beta Pictoris b is about 20 million years old - very young in astronomical terms, compared to the Earth's 4.5 billion years.

The astronomers used a technique called high-dispersion spectroscopy to measure changes in the wavelengths of radiation emitted by the planet and so determine its spin velocity. - AFP


sign up
 
 

Comment Guidelines



  1. Please read our comment guidelines.
  2. Login and register, if you haven’ t already.
  3. Write your comment in the block below and click (Post As)
  4. Has a comment offended you? Hover your mouse over the comment and wait until a small triangle appears on the right-hand side. Click triangle () and select "Flag as inappropriate". Our moderators will take action if need be.

     

Join us on

IOL-Social networks IOL-Social networks IOL-Social networks IOL-Social networks