School bus-size asteroid to safely zoom past Earth

School bus-size asteroid to safely zoom past Earth
This illustration shows a near-Earth asteroid like asteroid 2020 SW traveling through space. Credit: NASA/JPL-Caltech

A small near-Earth asteroid (or NEA) will briefly visit Earth's neighborhood on Thursday, Sept. 24, zooming past at a distance of about 13,000 miles (22,000 kilometers) above our planet's surface. The asteroid will make its close approach below the ring of geostationary satellites orbiting about 22,000 miles (36,000 kilometers) away from Earth.

Based on its brightness, scientists estimate that 2020 SW is roughly 15 to 30 feet (5 to 10 meters) wide - or about the size of a small school bus. Although it's not on an impact trajectory with Earth, if it were, the space rock would almost certainly break up high in the atmosphere, becoming a bright meteor known as a fireball.

"There are a large number of tiny asteroids like this one, and several of them approach our planet as close as this several times every year," said Paul Chodas, director of the Center for Near-Earth Object Studies (CNEOS) at NASA's Jet Propulsion Laboratory in Southern California. "In fact, asteroids of this size impact our atmosphere at an average rate of about once every year or two."

After asteroid 2020 SW was discovered on Sept. 18 by the NASA-funded Catalina Sky Survey in Arizona, follow-up observations confirmed its orbital trajectory with high precision, ruling out any chance of impact. CNEOS scientists determined that it will make its at 4:12 a.m. PDT (7:12 a.m. EDT) on Sept. 24 over the Southeastern Pacific Ocean. After Thursday's , the asteroid will continue its journey around the Sun, not returning to Earth's vicinity until 2041, when it will make a much more distant flyby.

This animation from NASA's Center for Near-Earth Object Studies depicts asteroid 2020 SW's trajectory as it safely passes Earth on Sept. 24, 2020. Also shown is the location of a typical geosynchronous satellite (labeled "GEOSAT"), orbiting 22,000 miles (36,000 kilometers) above Earth's equator. Credit: NASA/JPL-Caltech

In 2005, Congress assigned NASA the goal of finding 90% of the near-Earth asteroids that are about 460 feet (140 meters) or larger in size. These larger asteroids pose a much greater threat if they were to impact, and they can be detected much farther away from Earth, because they're simply much brighter than the small ones. It is thought that there are over 100 million small asteroids like 2020 SW, but they are hard to discover unless they get very close to Earth.

"The detection capabilities of NASA's surveys are continually improving, and we should now expect to find asteroids of this size a couple days before they come near our planet," added Chodas.


Explore further

Asteroid 1998 OR2 to safely fly past Earth this week

More information: More information about CNEOS, asteroids, and near-Earth objects can be found at cneos.jpl.nasa.gov
Citation: School bus-size asteroid to safely zoom past Earth (2020, September 23) retrieved 27 October 2020 from https://phys.org/news/2020-09-school-bus-size-asteroid-safely-earth.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
411 shares

Feedback to editors

User comments