by Mark Thompson
October 28, 2011

from DiscoveryNews Website


There's a strange brightening in the Uranian atmosphere and amateur astronomers can help investigate what it is.


Of all the planets in our solar system, I'm usually guilty of thinking poor old Uranus is pretty bland and uninteresting.

In fact, the only interesting things I can ever think to say about it are that it orbits the sun on its side... and has a pretty exciting story attached to its discovery.

As this 2004 infrared Keck telescope image shows, Uranus is tilted,

plus it has structure in its atmosphere. It even has a ring system.

Not so boring now, is it. Click to enlarge this image.
Lawrence Sromovsky

(Univ. Wisconsin-Madison), Keck Observatory


Something exciting has happened on Uranus!

Uranus, like the other giant planets in the solar system (Jupiter, Saturn and Neptune), is made up almost entirely of gas, although it differs in composition to Jupiter and Saturn - it has higher quantities of water, methane and ammonia ices. Unlike conventional ice, it's a super dense liquid.


Uranus, like Neptune (below video), is often referred to as an "ice giant."





Uranus measures a mighty four-times the diameter of Earth and orbits the sun at an average distance of 2.9 billion kilometers (around 20 times the Earth-sun distance).


From that distance it's only just visible to the naked eye under dark skies, but telescopes are needed to see any detail. Nearer planets seem to receive more attention from amateur astronomers but that may be about to change.

An image taken by planetary scientist Larry Sromovsky, with the Gemini 8.1 meter telescope shows a bright patch that is thought to be an eruption of methane ice high in the atmosphere.

Leading planetary scientist Heidi B. Hammel used her Facebook page to announce the discovery and to appeal for further observations.


Amateur astronomers with advanced equipment are being asked to make observations of the planet and, if enough confirmations are received, it may lead controllers of the Hubble Space Telescope to interrupt observations and take a closer look.

Understanding the nature of this spot is important, Hammel explained to Discovery News.

"The reason we care about the clouds on the planet Uranus is that they seem to be seasonally driven," said Hammel. "Uranus spins tipped over on its side, giving rise to extreme changes in sunlight as its seasons progress.

"The changes are therefore much more dramatic than for other planets. Uranus thus gives us unique insight into the energy balance in a planetary atmosphere."

It's almost like a weather system on steroids, as the northern hemisphere receives 42 years of sunlight and constant energy from the sun with the southern hemisphere plunged into 42 years of darkness.

Unfortunately, this new outburst may be just out of reach of most amateur astronomers but those with more advanced equipment should certainly take a look.

It seems fitting that 230 years since the planet was discovered by Herschel, himself an amateur astronomer, it may be the work of modern day amateurs that unlock clues to the nature of Uranus' strange atmospheric effects.