NASA maps Earth-threatening asteroids
Thankfully, none of the mapped asteroids pose a threat to Earth. At least for a 100 years or so.
Wed, Aug 14, 2013 at 03:44 PM
This NASA graphic shows the orbits of all the known Potentially Hazardous Asteroids (PHAs), numbering over 1,400 as of early 2013. Shown here is a close-up of the orbits overlaid on the orbits of Earth and other inner planets. (Image: NASA)
If you've seen films like "Armageddon," you know the potential threat asteroids can be for Earth. To meet that threat, NASA has built a map like no other: a plot of every dangerous asteroid that could potentially endanger our planet … at least the ones we know about.
NASA released the new map of "potentially hazardous asteroids" on Aug. 2 in a post to its online Planetary Photojournal overseen by the agency's Jet Propulsion Laboratory in Pasadena, Calif. The map shows the orbital paths of more than 1,400 asteroids known creep too close to Earth for comfort. None of the asteroids mapped pose an impact threat to Earth within the next 100 years, agency officials said.
"These are the asteroids considered hazardous because they are fairly large (at least 460 feet or 140 meters in size), and because they follow orbits that pass close to the Earth's orbit (within 4.7 million miles or 7.5 million kilometers)," NASA officials explained in the image description. [See photos of potentially dangerous asteroids seen by NASA]
The asteroid map shows a dizzying swarm of overlapping blue ellipses (the asteroid orbits) surrounding the sun. The orbits of Earth, Venus, Mercury, Mars and Jupiter are also visible to put the asteroid orbits in perspective on a solar system-wide scale.
If you're worried about a rogue asteroid or comet obliterating life as we know it this week, don't panic just yet. Just because the asteroids in the new NASA map are classified as "potentially hazardous" — scientists call them PHAs in NASA-speak — that doesn't mean they are an imminent threat to the Earth, NASA said.
According to NASA, "being classified as a PHA does not mean that an asteroid will impact the Earth: None of these PHAs is a worrisome threat over the next 100 years. By continuing to observe and track these asteroids, their orbits can be refined and more precise predictions made of their future close approaches and impact probabilities."
NASA scientists and astronomers around the world are constantly searching for asteroids that may pose an impact threat to Earth. NASA has said that roughly 95 percent of the largest asteroids that could endanger Earth — space rocks at least 0.6 miles (1 km) wide — have been identified through these surveys.
At the Jet Propulsion Laboratory, NASA's Asteroid Watch project scientists work to share the latest asteroid discoveries and potential threats with the public. The Asteroid Watch is part of NASA's Near-Earth Object Program that studies asteroids and comets, as well as their potential impact threats to the Earth and other planets.
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