The Earth - Moon Neighborhood
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The Earth - Moon Neighborhood. Once we leave the Earths atmosphere we are in space. However, the Earth - Moon Neighborhood is actually very crowded with

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The Earth - Moon Neighborhood

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The earth moon neighborhood

The Earth - Moon Neighborhood

Once we leave the Earths atmosphere we are in space.

However, the Earth - Moon Neighborhood is actually very crowded with

A variety of man made objects, (satellites) and a lot of natural phenomenon like the Van Allen Radiation Belt, Near Earth Asteroids (NEA’s), also known as Near Earth Objects (NEO’s).

There are hundreds of satellites orbiting the Earth at a variety of orbital altitudes and inclinations. Some times there are satellite crashes, creating a lot of orbital debris.

There are thousands of Near Earth Asteroids, of various sizes, some of which actually pass between the Earth and the Moon. Some enter the Earth’s atmosphere, and some actually impact the Earth (that might be why we care about them – see the Tunguska Event).

In addition there are special locations of interest where large space structures can be in a stable orbit in the Earth - Moon Neighborhood. These locations are called Lagrange Libration Points (a good place for a large space structure or a colony).

S. Akerley 2011


The earth moon neighborhood

NEAs

Near Earth Asteroids

Over the last 18 Years,

More than 90 NEAs have been identified

or have passed between the Earth and Moon

Orbits. An Average of 5 per year.

It is estimated that there are about 5000

NEAs of various sizes.

Some have or will enter the Earths

Atmosphere, and some will impact the Earth..

Lagrange Libration Point L4

L4

Van Allen Radiation Belt

(30,000 to 40,000 miles)

Geo-Synchronous Earth Orbit (GEO Approx. 22,500 miles Altitude)

Earth

L1L2

Moon

(238,900 miles)

Space Station Orbit (LOE)

(Approx. 150 miles Altitude)

(Atmosphere ends at 65 miles Altitude)

(Hubble Telescope approx. 300 - 600 miles Altitude)

L5

Note: Lagrange Libration Point L4 and L5

Are equidistant from Earth and Moon

At the Moons orbital distance

N79 N89

N1 N2 N3 N4

Lagrange Libration Point L5

The Earth - Moon Neighborhood

S. Akerley 2011


The earth moon neighborhood

400 Meter Diameter

S. Akerley 2011


The earth moon neighborhood

Close Encounters

Different types of NEA

Near Earth Asteroid

“Fly By” Encounters

S. Akerley 2011


The earth moon neighborhood

EarthL5MoonNear Earth Asteroids

(NEA)

Gravity Wells

Earth’s Gravity Well

art work courtesy of NASA

S. Akerley 2011


The earth moon neighborhood

Review of the


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