Apophis - NASA Science
Overview. Asteroid 99942 Apophis is a near-Earth object (NEO) estimated to be about 1,100 feet (335 meters) across. When it was discovered in 2004, Apophis was identified as one of the most hazardous asteroids that could impact Earth. But that impact assessment changed after astronomers tracked Apophis, and its orbit became better determined.
NASA Analysis: Earth Is Safe From Asteroid Apophis for 100-Plus …
2021年3月26日 · When Apophis made a distant flyby of Earth around March 5, astronomers took the opportunity to use powerful radar observations to refine the estimate of its orbit around the Sun with extreme precision, enabling them to confidently …
OSIRIS-APEX - NASA Science
OSIRIS-APEX is a mission to study the physical changes to asteroid Apophis that will result from its rare close encounter with Earth in April 2029. That year, Apophis’ orbit will bring it within 20,000 miles (32,000 kilometers) of Earth’s surface — …
Planetary Defense Exercise Uses Apophis as Hazardous Asteroid ... - NASA
2022年5月31日 · The exercise focused on the real asteroid Apophis. For a short while after its discovery in 2004, Apophis was assessed to have a significant chance of impacting Earth in 2029 or later.
NASA Analysis: Earth Is Safe From Asteroid Apophis for 100-Plus …
2021年3月25日 · The near-Earth object was thought to pose a slight risk of impacting Earth in 2068, but now radar observations have ruled that out. After its discovery in 2004, asteroid 99942 Apophis had been identified as one of the most hazardous asteroids that could impact Earth. But that impact assessment changed as astronomers tracked Apophis and its ...
NASA Rules Out Earth Impact in 2036 for Asteroid Apophis
2013年1月10日 · PASADENA, Calif. -- NASA scientists at the agency's Jet Propulsion Laboratory in Pasadena, Calif., effectively have ruled out the possibility the asteroid Apophis will impact Earth during a close flyby in 2036. The scientists used updated information obtained by NASA-supported telescopes in 2011 and 2012, as well as new data from the time ...
NASA Asteroid Sampling Mission Renamed OSIRIS-APEX for New …
2023年12月22日 · The former OSIRIS-REx spacecraft sets off on a journey to study asteroid Apophis and take advantage of the asteroid’s 2029 flyby of Earth, the likes of which hasn’t happened since the dawn of recorded history.
NASA’s OSIRIS-APEX to Fly Closer to Sun to Reach Asteroid Apophis
2023年12月1日 · Reinvented as NASA’s OSIRIS-APEX, the spacecraft formerly known as OSIRIS-REx is about to face the first major test of its mission to asteroid Apophis: it will fly closer to the Sun than ever before, exposing its components to higher temperatures than they were designed to endure.
Planetary Defense Exercise Uses Apophis as Hazardous Asteroid …
2022年5月31日 · Watching the skies for large asteroids that could pose a hazard to the Earth is a global endeavor. So, to test their operational readiness, the international planetary defense community will sometimes use a real asteroid’s close approach as a mock encounter with a “new” potentially hazardous asteroid. The lessons learned could limit, or ...
Scientists Planning Now for Asteroid Flyby a Decade Away
2019年4月29日 · NASA explores the unknown in air and space, innovates for the benefit of humanity, and inspires the world through discovery. On April 13, 2029, asteroid Apophis will cruise harmlessly by Earth at distance of about 19,000 miles (31,000 kilometers). Scientists are already planning observations and science opportunities for the event.