On Oct. 12 EDT (Oct. 11 PDT), a small asteroid designated 2012 TC4 will safely pass by Earth at a distance of approximately 26,000 miles (42,000 kilometers). This is a little over one tenth the distance to the Moon and just above the orbital altitude of communications satellites. This encounter with TC4 is being used by asteroid trackers around the world to test their ability to operate as a coordinated international asteroid warning network.
2012 TC4 is estimated to be 50 to 100 feet (15 to 30 meters) in size. Orbit prediction experts say the asteroid poses no risk of impact with Earth. Nonetheless, its close approach to Earth is an opportunity to test the ability of a growing global observing network to communicate and coordinate its optical and radar observations in a real scenario.
Oct. 11, 2017 movie of asteroid 2012 TC4 using the 1.0-meter Kiso Schmidt telescope in Nagano, Japan. Credit: Kiso Observatory, the University of Tokyo
This asteroid was discovered by the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) in Hawaii in 2012. Pan-STARRS conducts a near-Earth object (NEO) survey funded by NASA’s NEO Observations Program, a key element of NASA’s Planetary Defense Coordination Office. However, 2012 TC4 traveled out of the range of asteroid-tracking telescopes shortly after it was discovered.
Based on the observations they were able to make in 2012, asteroid trackers predicted that it should come back into view in the fall of 2017. Observers with the European Space Agency and the European Southern Observatory were the first to recapture 2012 TC4, in late July 2017, using one of their large 8-meter aperture telescopes.Since then, observers around the world have been tracking the object as it approaches Earth and reporting their observations to the Minor Planet Center.
This “test” of what has become a global asteroid-impact early-warning system is a volunteer project, conceived and organized by NASA-funded asteroid observers and supported by the NASA Planetary Defense Coordination Office (PDCO).
As explained by Michael Kelley, program scientist and NASA PDCO lead for the TC4 observation campaign, “Asteroid trackers are using this flyby to test the worldwide asteroid detection and tracking network, assessing our capability to work together in response to finding a potential real asteroid-impact threat.”
No asteroid currently known is predicted to impact Earth for the next 100 years.
Asteroid TC4’s closest approach to Earth will be over Antarctica at 1:42 AM EDT on Oct. 12 (10:42 p.m. PDT on Oct. 11). Tens of professionally run telescopes across the globe will be making ground-based observations in wavelengths from visible to near-infrared to radar. Amateur astronomers may contribute more observations, but the asteroid will be very difficult for backyard astronomers to see, as current estimates are that it will reach a visual magnitude of only about 17 at its brightest, and it will be moving very fast across the sky.
Many of the observers who are participating in this exercise are funded by NASA’s NEO Observations Program, but observers supported by other countries’ space agencies and space institutions around the world are now involved in the campaign.
Vishnu Reddy, an assistant professor at the University of Arizona’s Lunar and Planetary Laboratory in Tucson, is leading the 2012 TC4 campaign. Reddy is principal investigator for a NASA-funded near-Earth asteroid characterization project. “This campaign is a team effort that involves more than a dozen observatories, universities and labs around the globe so we can collectively learn the strengths and limitations of our near-Earth object observation capabilities,” he said. “This effort will exercise the entire system, to include the initial and follow-up observations, precise orbit determination, and international communications.”
In September, asteroid observers were able to conduct a “pre-test” of coordinated tracking of the close approach of a much larger asteroid known as 3122 Florence. Florence, one of the largest known NEOs, at 2.8 miles (4.5 kilometers) in size, passed by Earth on Sept. 1 at 18 times the distance to the Moon. Coordinated observations of this asteroid revealed, among other things, that Florence has two moons.
The Latest on: Asteroid warning network
- Photo Shows God of Chaos Asteroid Apophis Before It Passes Earth Tonighton March 5, 2021 at 5:51 am
The large space rock will zoom past our planet at a distance dozens of times further away than the moon—but a much closer approach is due in 2029.
- Asteroid Apophis Is Swinging by This Weekend to Taunt Uson March 4, 2021 at 5:31 pm
An asteroid with a small chance of hitting Earth in 2068 will swing past our planet in the coming days, providing a rare opportunity for astronomers to observe this potentially hazardous object.
- Asteroid the size of the Golden Gate Bridge to zoom by Earthon March 3, 2021 at 11:51 am
An asteroid similar in size to the Golden Gate Bridge will whip past Earth later this month — the largest and fastest asteroid to pass close to our planet this year. But don't worry, it won't ...
- England meteor: How do you find a meteorite?on March 3, 2021 at 8:14 am
People living in these areas are being asked to contact the UK Meteor Network or National History Museum if they find any bits of rock they believe are meteorites. Meteorites are often dark, shiny ...
- God of Chaos Asteroid to Pass Earth This Week Before 2029's Close Approachon March 2, 2021 at 8:11 am
The asteroid Apophis is due to make a close approach to Earth this week, and scientists are preparing to observe the flyby. The space rock, thought to be between 310 and 680 meters (1,017 ft to 2,230 ...
- Planetary defense experts use infamous asteroid Apophis to practice spotting dangerous space rockson March 2, 2021 at 4:26 am
Now, scientists are using this month's flyby of the infamous asteroid Apophis to test their responses to potentially hazardous space rocks, honing the fine art of planetary defens ...
- Asteroid Apophis the chosen target of a planetary defense exercise during its 6 March flybyon March 2, 2021 at 1:50 am
Experts in planetary defense are relying on the popular asteroid Apophis to try their hand at calculations and capabilities to prevent deadly collisions of asteroids that post a hazard to life on ...
- Planetary defense experts use infamous asteroid Apophis to practice spotting dangerous space rockson March 1, 2021 at 6:57 am
To mark this year's flyby, the International Asteroid Warning Network instituted its third such campaign. Previously, scientists have practiced on an asteroid called 2012 TC4 and on 1999 KW4 ...
- Search for missing meteor in Gloucestershire gardens – locals told to 'avoid touching it'on March 1, 2021 at 6:41 am
A METEOR that lit up Britain's skies on Sunday night is understood to have landed in the Gloucestershire area. Here is what you should do if you find it.
via Google News and Bing News