Jupiter, solar system's 'big bully,' takes a punch

Jul 30, 2009 by David L. Chandler
This Hubble Space Telescope picture is the sharpest visible-light picture taken of the slowly-expanding impact feature, whose diameter is more than twice the coast-to-coast size of the United States. The combination of Hubble data with mid-infrared images from ground-based telescopes will give astronomers an insight into the nature of changes in Jupiter's atmosphere from the impact.

(PhysOrg.com) -- Astronomers have been turning the world's most powerful telescopes toward Jupiter, the solar system's largest planet, ever since Australian amateur astronomer Anthony Wesley discovered a new dark marking on the planet, apparently the scar from an impacting asteroid or comet, on the night of July 19. MIT professor of planetary science Richard Binzel says the impact highlights the role that Jupiter, with its powerful gravitational field, plays in protecting the Earth and other planets from such impacts.

"Jupiter is the big bully of the solar system," says Binzel, who specializes in observations of asteroids and comets. But if it's a bully to some celestial objects, it's the protector of others. "Under Jupiter's influence, many objects end up being cast into the sun, some get cast out [of the solar system], and some end up striking Jupiter itself. The net result is that Jupiter keeps the inner more cleaned out than it might otherwise be."

This is only the second time such impact scars have ever been seen on Jupiter, following the widely observed impacts on that planet by many fragments of the shattered in 1994, and suggests that such events may not be as rare as astronomers had thought.

Binzel has written extensively about the issue of impacts on planets by these smaller objects, and created the Torino Scale as a way of communicating the risk of possible impacts on Earth by newly discovered asteroids or comets. He says the discovery of this new impact is a surprise.

"We had no idea these kinds of impacts might be so frequent," Binzel says, adding that the new question is whether having two impacts on Jupiter within 15 years - after centuries of observations in which no such impacts were seen - is just a coincidence, or a result of our ever-improving ability to observe and detect such events.

Binzel also said the discovery shows the important role amateurs play in modern-day astronomy.

"Detecting these kinds of spots on , and being sure about them, may be attributable to modern technology," Binzel says. "Amateur astronomers can now be equipped with very capable digital cameras - using CCDs, like the sensors in your pocket digital camera - that give a comparable capability to what only professional astronomers had a decade ago. Thus the capability of amateur astronomers, who play an essential role in monitoring the planets for new phenomena, means that any new event like this is almost certain to be picked up."

Provided by Massachusetts Institute of Technology (news : web)

Explore further: Google exec makes record skydive from edge of space

add to favorites email to friend print save as pdf

Related Stories

Revised asteroid scale aids understanding of impact risk

Apr 12, 2005

Astronomers led by an MIT professor have revised the scale used to assess the threat of asteroids and comets colliding with Earth to better communicate those risks with the public. The overall goal is to provide easy-to-understand inf ...

New Images Indicate Object Hits Jupiter

Jul 21, 2009

(PhysOrg.com) -- Scientists have found evidence that another object has bombarded Jupiter, exactly 15 years after the first impacts by the comet Shoemaker-Levy 9.

Signs Of Alien Asteroid Belt

Apr 20, 2005

NASA's Spitzer Space Telescope has spotted what may be the dusty spray of asteroids banging together in a belt that orbits a star like our sun. The discovery offers astronomers a rare glimpse at a distant ...

Recommended for you

Hinode satellite captures X-ray footage of solar eclipse

11 hours ago

The moon passed between the Earth and the sun on Thursday, Oct. 23. While avid stargazers in North America looked up to watch the spectacle, the best vantage point was several hundred miles above the North ...

Asteroid 2014 SC324 zips by Earth Friday afternoon

21 hours ago

What a roller coaster week it's been. If partial eclipses and giant sunspots aren't your thing, how about a close flyby of an Earth-approaching asteroid?  2014 SC324 was discovered on September 30 this ...

User comments : 0