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List Of Asteroid Close Approaches To Earth
This is a list of examples where an asteroid or meteoroid travels close to the Earth. Some are regarded as potentially hazardous objects if they are estimated to be large enough to cause regional devastation. Near-Earth object detection technology began to improve around 1998, so objects being detected as of 2004 could have been missed only a decade earlier due to a lack of dedicated near-Earth astronomical surveys. As sky surveys improve, smaller and smaller asteroids are regularly being discovered. The small near-Earth asteroids , 2014 AA, 2018 LA, 2019 MO and 2022 EB5 are the only five asteroids discovered before impacting into Earth (see asteroid impact prediction). Scientists estimate that several dozen asteroids in the size range fly by Earth at a distance closer than the moon every year, but only a fraction of these are actually detected. Timeline of approaches within one lunar distance The average distance to the Moon (or lunar distance (LD)) is about , which is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asteroid Impact Prediction
Asteroid impact prediction is the prediction of the dates and times of asteroids impacting Earth, along with the locations and severities of the impacts. The process of impact prediction follows three major steps: # Discovery of an asteroid and initial assessment of its orbit which is generally based on a short observation arc of less than 2 weeks. # Follow up observations to improve the orbit determination # Calculating if, when and where the orbit may intersect with Earth at some point in the future. In addition, although not strictly part of the prediction process, once an impact has been predicted, an appropriate response needs to be made. Most asteroids are discovered by a camera on a telescope with a wide field of view. Image differencing software compares a recent image with earlier ones of the same part of the sky, detecting objects that have moved, brightened, or appeared. Those systems usually obtain a few observations per night, which can be linked up into a very pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Asteroid Close Approaches To Earth In 2020
Below is the list of asteroid close approaches to Earth in 2020. Timeline of known close approaches less than one lunar distance from Earth A list of known near-Earth asteroid close approaches less than 1 lunar distance () from Earth in 2020.For a list of current Earth close approaches seClose ApproachesanNEO Earth Close Approaches/ref> For reference, the radius of Earth is about or 0.0166 lunar distances. Geosynchronous satellites have an orbit with semi-major axis length of or 0.110 lunar distances. A number of known asteroids came closer than this in 2020, notably 2020 CW, 2020 JJ, 2020 QG, and which all approached Earth within 0.05 lunar distances. Two objects have been observed to be temporary satellites of Earth: in February 2020 and 2020 SO in September 2020, albeit the latter has been confirmed to be a rocket booster from the Surveyor 2 mission launched in 1966. Warning times by size This sub-section visualises the warning times of the cl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Asteroid Close Approaches To Earth In 2019
Below is the list of asteroid close approaches to Earth in 2019. Timeline of known close approaches less than one lunar distance from Earth A list of known near-Earth asteroid close approaches less than 1 lunar distance () from Earth in 2019.For a list of current Earth close approaches seNEO Earth Close Approaches/ref> 2019 has been a notable year in that an asteroid was detected prior to impact ( 2019 MO). This has only happened three times previously (see List of successfully predicted asteroid impacts). In addition, for the first year ever, four close approaches of previously undiscovered asteroids were successfully predicted over a week in advance. For reference, the radius of Earth is approximately or 0.0166 lunar distances.Geosynchronous satellites have an orbit with semi-major axis length of or 0.110 lunar distances. A number of known asteroids came closer than this in 2019, notably including 2019 MO which was detected a few hours before it impacted, only the four ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Asteroid Close Approaches To Earth In 2018
Below is the list of asteroid close approaches to Earth in 2018. Timeline of known close approaches less than one lunar distance from Earth A list of known near-Earth asteroid close approaches less than 1 lunar distance () from Earth in 2018.For a list of current Earth close approaches seNEO Earth Close Approaches/ref> For reference, the radius of Earth is approximately or 0.0166 lunar distances.Geosynchronous satellites have an orbit with semi-major axis length of or 0.110 lunar distances. Eight known asteroids ( 2018 BD, A106fgF, 2018 LA, A107j4q, , 2018 UA, , and ) are confirmed to have passed within this distance, and poorly-observed asteroids ZB0A262, , ZGBE54F, A1080DC , ZW87F01, and ZW900BE may have also passed within this distance. While most asteroids on this list are confirmed, well-observed unconfirmed objects with a 50% or greater chance of passing within 1 LD of the Earth are included as well. Warning Times by Size This sub-section visua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Asteroid Close Approaches To Earth In 2017
Below is the list of asteroid close approaches to Earth in 2017. Timeline of known close approaches less than one lunar distance from Earth in 2017 A list of known near-Earth asteroid close approaches less than 1 Lunar distance (astronomy), lunar distance () from Earth in 2017. For reference, the Earth radius, radius of Earth is approximately or 0.0166 lunar distances.Geosynchronous satellites have an orbit with Semi-major and semi-minor axes, semi-major axis length of or 0.110 lunar distances. In 2017, five known asteroids have traveled nearer than this, 2017 GM, 2017 UJ2, YU95BEF, 2017 EA, and 2017 WE30. P10ELNY and A104Vqx probably have traveled nearer, but knowledge of their orbits is too poor to be sure. While most asteroids on this list are confirmed, well-observed unconfirmed objects with a 50% or greater chance of passing within 1 LD of the Earth are included as well. This list does not include any of the List of bolides, 29 objects that collided with earth in 2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Asteroid Close Approaches To Earth In 2016
Below is the list of asteroid close approaches to Earth in 2016. Timeline of known close approaches less than one Lunar distance from Earth in 2016 A list of known near-Earth asteroid close approaches less than 1 lunar distance () from Earth in 2016.For a list of current Earth close approaches seNEO Earth Close Approaches/ref> For reference, the radius of Earth is approximately or 0.0166 Lunar distances.The orbit of geosynchronous satellites, however, is or 0.110 Lunar distances. This year, 6 (possibly 7) asteroids traveled nearer than this, most notably , which approached a mere 1.25 Earth radii (8000 km) from the surface. While most asteroids on this list are confirmed, well-observed unconfirmed objects with a 50% or greater chance of passing within 1 LD of the Earth are included as well. This list does not include any of the 32 objects that collided with earth in 2016, none of which were discovered in advance, but were recorded by sensors designed to detect detonat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Asteroid Close Approaches To Earth In 2015
Below is the list of asteroid close approaches to Earth in 2015. Timeline of known close approaches less than one lunar distance from Earth in 2015 A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2015.For a list of current Earth close approaches seNEO Earth Close Approaches/ref> Note this data does not include any of the 43 objects that collided with earth in 2015, none of which were discovered in advance, but were recorded by sensors designed to detect detonation of nuclear devices (of the 43 objects detected, 2 had an impact energy greater than that of a 1 kiloton device). Warning Times by Size This sub-section visualises the warning times of the close approaches listed in the above table, depending on the size of the asteroid. The sizes of the charts show the relative sizes of the asteroids to scale. For comparison, the approximate size of a person is also shown. This is based the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Asteroid Close Approaches To Earth In 2014
Below is the list of asteroid close approaches to Earth in 2014. Timeline of known close approaches less than one lunar distance from Earth in 2014 A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2014.For a list of current Earth close approaches seNEO Earth Close Approaches/ref> For reference, the radius of Earth is approximately or 0.0166 Lunar distances.The orbit of geosynchronous satellites, however, is or 0.110 Lunar distances. This year, 3 asteroids were detected which traveled nearer than this, most notably 2014 AA, which impacted. This list does not include any of the other 32 objects that collided with earth in 2014, none of which were discovered in advance, but were recorded by sensors designed to detect detonation of nuclear devices (of the 33 objects detected 5 had an impact energy greater than that of a 1 kiloton device). Warning Times by Size This sub-section visualises ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Asteroid Close Approaches To Earth In 2012
List of asteroid close approaches to Earth in 2012 is a listing of asteroids noted for their close approach to planet Earth Timeline of close approaches less than one lunar distance from Earth in 2012 A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2012.For a list of current Earth close approaches seNEO Earth Close Approaches/ref> This list does not include any of the objects that collided with earth in 2012, none of which were discovered in advance, but were recorded by sensors designed to detect detonation of nuclear devices. Warning Times by Size This sub-section visualises the warning times of the close approaches listed in the above table, depending on the size of the asteroid. The sizes of the charts show the relative sizes of the asteroids to scale. For comparison, the approximate size of a person is also shown. This is based the absolute magnitude of each asteroid, an approx ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Asteroid Close Approaches To Earth In 2011
Below is the list of asteroid close approaches to Earth in 2011. Timeline of close approaches less than one lunar distance from Earth in 2011 A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2011.For a list of current Earth close approaches seNEO Earth Close Approaches/ref> This list does not include any of the objects that collided with earth in 2011, none of which were discovered in advance, but were recorded by sensors designed to detect detonation of nuclear devices. Warning Times by Size This sub-section visualises the warning times of the close approaches listed in the above table, depending on the size of the asteroid. The sizes of the charts show the relative sizes of the asteroids to scale. For comparison, the approximate size of a person is also shown. This is based the absolute magnitude of each asteroid, an approximate measure of size based on brightness. Abs Magnitude 30 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Asteroid Close Approaches To Earth In 2010
Below is the list of asteroid close approaches to Earth in 2010. Timeline of close approaches less than one lunar distance from Earth in 2010 A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2010.For a list of current Earth close approaches seNEO Earth Close Approaches/ref> This list does not include any of the objects that collided with earth in 2010, none of which were discovered in advance, but were recorded by sensors designed to detect detonation of nuclear devices. Warning Times by Size This sub-section visualises the warning times of the close approaches listed in the above table, depending on the size of the asteroid. The sizes of the charts show the relative sizes of the asteroids to scale. For comparison, the approximate size of a person is also shown. This is based the absolute magnitude of each asteroid, an approximate measure of size based on brightness. Abs Magnitude 30 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
