What does near-earth object mean?

Definitions for near-earth object
near-earth ob·ject

This dictionary definitions page includes all the possible meanings, example usage and translations of the word near-earth object.


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Wiktionary

  1. near-Earth objectnoun

    An asteroid, comet or large meteoroid whose orbit intersects Earth's orbit, especially those which pose a collision danger.

Wikipedia

  1. Near-Earth object

    A near-Earth object (NEO) is any small Solar System body whose orbit brings it into proximity with Earth. By convention, a Solar System body is a NEO if its closest approach to the Sun (perihelion) is less than 1.3 astronomical units (AU). If a NEO's orbit crosses the Earth's orbit, and the object is larger than 140 meters (460 ft) across, it is considered a potentially hazardous object (PHO). Most known PHOs and NEOs are asteroids, but a small fraction are comets.There are over 30,503 known near-Earth asteroids (NEAs) and over a hundred known short-period near-Earth comets (NECs). A number of solar-orbiting meteoroids were large enough to be tracked in space before striking the Earth. It is now widely accepted that collisions in the past have had a significant role in shaping the geological and biological history of the Earth. Asteroids as small as 20 metres (66 ft) in diameter can cause significant damage to the local environment and human populations. Larger asteroids penetrate the atmosphere to the surface of the Earth, producing craters if they impact a continent or tsunamis if they impact the sea. Interest in NEOs has increased since the 1980s because of greater awareness of this potential danger. Asteroid impact avoidance by deflection is possible in principle, and methods of mitigation are being researched.Two scales, the simple Torino scale and the more complex Palermo scale, rate the risk presented by an identified NEO based on the probability of it impacting the Earth and on how severe the consequences of such an impact would be. Some NEOs have had temporarily positive Torino or Palermo scale ratings after their discovery. Since 1998, the United States, the European Union, and other nations are scanning the sky for NEOs in an effort called Spaceguard. The initial US Congress mandate to NASA to catalog at least 90% of NEOs that are at least 1 kilometre (3,300 ft) in diameter, sufficient to cause a global catastrophe, was met by 2011. In later years, the survey effort was expanded to include smaller objects which have the potential for large-scale, though not global, damage. NEOs have low surface gravity, and many have Earth-like orbits that make them easy targets for spacecraft. As of January 2019, five near-Earth comets and five near-Earth asteroids have been visited by spacecraft. A small sample of one NEO was returned to Earth in 2010, and similar missions are in progress. Preliminary plans for commercial asteroid mining have been drafted by private startup companies, either through the use of robots or even by sending private commercial astronauts to act as space miners.

Wikidata

  1. Near-Earth object

    A near-Earth object is a Solar System object whose orbit brings it into proximity with the Earth. All NEOs have a closest approach to the Sun of less than 1.3 AU. They include a few thousand near-Earth asteroids, near-Earth comets, a number of solar-orbiting spacecraft, and meteoroids large enough to be tracked in space before striking the Earth. It is now widely accepted that collisions in the past have had a significant role in shaping the geological and biological history of the planet. NEOs have become of increased interest since the 1980s because of increased awareness of the potential danger some of the asteroids or comets pose to the Earth, and active mitigations are being researched. Those NEOs that are asteroids have orbits that lie partly between 0.983 and 1.3 astronomical units away from the Sun. When an NEA is detected it is submitted to the IAU's Minor Planet Center for cataloging. Some near-Earth asteroids' orbits intersect that of Earth's so they pose a collision danger. The United States, European Union, and other nations are currently scanning for NEOs in an effort called Spaceguard.

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Numerology

  1. Chaldean Numerology

    The numerical value of near-earth object in Chaldean Numerology is: 7

  2. Pythagorean Numerology

    The numerical value of near-earth object in Pythagorean Numerology is: 1

Examples of near-earth object in a Sentence

  1. Davide Farnocchia:

    Scout quickly ruled out 2023 BU as an impactor, but despite the very few observations, it was nonetheless able to predict that the asteroid would make an extraordinarily close approach with Earth, in fact, this is one of the closest approaches by a known near-Earth object ever recorded.

  2. Bill Gray:

    Jon pointed out that JPL's Horizons system showed that the DSCOVR spacecraft's trajectory did not go particularly close to the moon. It would be a little strange if the second stage went right past the moon, while DSCOVR was in another part of the sky. There's always some separation, but this was suspiciously large, analysis led by NASA's Jet Propulsion Laboratory's Center for Near-Earth Object Studies indicates the object expected to impact the far side of the Moon March 4 is likely the Chinese Chang' e 5-T1 booster launched in 2014.

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"near-earth object." Definitions.net. STANDS4 LLC, 2024. Web. 19 Apr. 2024. <https://www.definitions.net/definition/near-earth+object>.

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