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List of asteroid close approaches to Earth in 2017

List of asteroid close approaches to Earth in 2017 is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand List of asteroid close approaches to Earth in 2017 rather than just read about it. In short: 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 (0.0025696 AU (384,410 km; 238,860 mi)) from Earth in 2017, based on the close approach database of the Center for Near-Earth Object Studies (CNEOS).

List of asteroid close approaches to Earth in 2017 — main illustration
List of asteroid close approaches to Earth in 2017 — illustration

Key takeaways

  • List of asteroid close approaches to Earth in 2017 belongs to science; place it in that map before memorising details.
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  • Connect List of asteroid close approaches to Earth in 2017 to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of List of asteroid close approaches to Earth in 2017 from memory before moving on to harder problems.

Reference excerpt

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 (0.0025696 AU (384,410 km; 238,860 mi)) from Earth in 2017, based on the close approach database of the Center for Near-Earth Object Studies (CNEOS). For reference, the radius of Earth is approximately 0.0000426 AU (6,370 km; 3,960 mi) or 0.0166 lunar distances.Geosynchronous satellites have an orbit with semi-major axis length of 0.000282 AU (42,200 km; 26,200 mi) or 0.110 lunar distances. In 2017, four known asteroids have traveled nearer than this: 2017 GM, 2017 UJ2, 2017 EA, and 2017 WE30. Unconfirmed asteroids YU95BEF, P10ELNY and A104Vqx probably have traveled nearer, but knowledge of their orbits is too poor to be sure. The CNEOS database of close approaches lists some close approaches a full orbit or more before the discovery of the object, derived by orbit calculation. The list below only includes close approaches that are evidenced by observations, thus the pre-discovery close approaches are only included if the object was found by precovery. This list and relevant databases do not consider impacts as close approaches, thus this list does not include any of the 29 objects that collided with Earth's atmosphere in 2017, none of which were discovered in advance, but were observed visually or recorded by sensors designed to detect detonation of nuclear devices. Rows highlighted red indicate objects which were not discovered until after closest approach Rows highlighted yellow indicate objects discovered less than 24 hours before closest approach Rows highlighted green indicate objects discovered more than one week before closest approach Rows highlighted turquoise indicate objects discovered more than 7 weeks before closest approach Rows highlighted blue indicate objects discovered more than one year before closest approach(i.e. objects successfully cataloged on a previous orbit, rather than being detected during final approach)

In addition to the confirmed asteroids on the above list, which feature in the CNEOS close approach database, there have been well-observed unconfirmed or confirmed but poorly observed objects with a 50% or greater chance of passing within 1 LD of the Earth, which are listed separately below.

Warning times by size This sub-section visualises the warning times of the close approaches listed in the table of confirmed close approaches, 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. Absolute magnitude H ≥ 30 (smallest)

(size of a person for comparison)

Absolute magnitude 30 > H ≥ 29

Absolute magnitude 29 > H ≥ 28

Absolute magnitude 28 > H ≥ 27

Absolute magnitude 27 > H ≥ 26

Absolute magnitude 26 > H ≥ 25

Absolute magnitude 25 > H (largest)

Notes

Timeline of close approaches less than one lunar distance from the Moon in 2017 The number of asteroids listed here are significantly less than those of asteroids that approach Earth for several reasons. Asteroids that approach Earth not only move faster, but are brighter and are easier to detect with modern surveys because:

Asteroids that come closer to Earth are a higher priority to confirm, and only confirmed asteroids are listed with a lunocentric approach distance. Those that closely approach the Moon are frequently lost in its glare, making them harder to confirm. They are similarly hard to discover during the new moon, when the Moon is too close to the Sun to detect asteroids while they are near the Moon. These factors severely limit the amount of Moon-approaching asteroids, to a level many times lower than the asteroids detected passing as close to Earth.

Notes

Additional examples

An example list of near-Earth asteroids that passed or will pass more than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2017.

Statistics

Virtual impactors List of asteroids with a Palermo Technical Impact Hazard Scale greater than −6 that are listed on the Sentry Risk Table because they have short observation arcs with poorly constrained orbits and have a chance of impacting Earth in 2017. Given a short observation arc, many different orbits fit the observed data. 2010 XB73 could have approached Earth around May 2017 or could have been 9 AU from Earth on the way to a close approach with Saturn in 2018. A Palermo rating of −4 indicates an event that is 10,000 times less likely than the background hazard level of Earth impacts, which is defined as the average risk posed by objects of the same size or larger over the years until the date of the potential impact.

Notes

See also List of asteroid close approaches to Earth List of asteroid close approaches to Earth in 2016 List of asteroid close approaches to Earth in 2018 List of bolides (asteroids and meteoroids that impacted Earth)

Notes

References

External links Near-Earth object close approaches ±30 days within 5 LD (JPL) Upcoming close approaches to Earth (ESA) Table of Asteroids Next Closest Approaches to the Earth (Sormano Observatory)

Illustrations

List of asteroid close approaches to Earth in 2017: Radar animation of 2017 BQ6 during closest approach on 7 February 2017
Radar animation of 2017 BQ6 during closest approach on 7 February 2017
List of asteroid close approaches to Earth in 2017: Radar animation of 2014 JO25 during closest approach on 19 April 2017
Radar animation of 2014 JO25 during closest approach on 19 April 2017
List of asteroid close approaches to Earth in 2017: Graph of near-Earth object sizes and close approaches in 2017. Shown here, asteroid 2014 JO25 was the largest asteroid that has approached within 5 LD from Earth in 2017.
Graph of near-Earth object sizes and close approaches in 2017. Shown here, asteroid 2014 JO25 was the largest asteroid that has approached within 5 LD from Earth in 2017.

Worked examples

Example 1 — a first encounter with List of asteroid close approaches to Earth in 2017

Start with the simplest possible case. Write down what List of asteroid close approaches to Earth in 2017 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to List of asteroid close approaches to Earth in 2017 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about List of asteroid close approaches to Earth in 2017 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of List of asteroid close approaches to Earth in 2017

In research
List of asteroid close approaches to Earth in 2017 appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses List of asteroid close approaches to Earth in 2017 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
List of asteroid close approaches to Earth in 2017 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Lists of asteroids, Near-Earth asteroids, Near-Earth objects in 2017, so understanding it makes those chapters shorter.
In everyday life
Look for List of asteroid close approaches to Earth in 2017 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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Frequently asked questions

What is List of asteroid close approaches to Earth in 2017 in simple terms?

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 (0.0025696 AU (384,410 km; 238,860 mi)) from Earth in 2017, based on th…

Why does List of asteroid close approaches to Earth in 2017 matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study List of asteroid close approaches to Earth in 2017?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on List of asteroid close approaches to Earth in 2017.

Tags

  • Lists of asteroids
  • Near-Earth asteroids
  • Near-Earth objects in 2017

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