Download Artificial Satellites

Artificial Satellites
Chapter 2.3
Satellites
1.
Satellites
a. Any object in orbit around another body with a
larger mass.
Artificial Satellites
1.
Artificial Satellites VS Natural Satellites
a.An artificial satellite is a man-made
object place in orbit or space.
b.A natural satellite is a nature-made
object in orbit around a larger mass
such as a star or planet.
i. A moon is a natural satellite.
Artificial Satellites
c. Many types of satellites orbit the
earth. Some of those types are:
i. Meteorological
ii.Communications
iii.Navigation
iv.Scientific
Satellites and Orbits
1.
Satellites and Orbits
a. An object thrown on earth, and not
slowed down by air resistance but
affected by gravity, would continue
to follow the curve of the earth
instead of falling to earth’s surface.
b.This ball would be considered an
artificial satellite.
Satellites and Orbits
c. Satellites are put in earth’s orbit and space by
attaching rockets to them and shooting them to
the appropriate altitude.
Once the satellite is at the appropriate altitude the
rockets detach and the satellite is held in orbit by earth’s
gravity.
ii. The greater the altitude above earth’s surface the less air
resistance and earth’s force of gravity there is affecting
objects. This allows the speed of the satellite to slower
than lower orbiting satellites.
i.
Geosynchronous vs. Polar
d. Geosynchronous Orbit
i.
A satellite in geosynchronous orbit always remains at
the same point above the earth’s equator and appears to
be stationary in the sky.
e. Polar Orbit
A polar orbit carries the satellites over earth’s north and
south poles.
ii. These satellites pass over different parts of the earth’s
surface during each revolution.
i.
Elliptical Orbits
a.Elliptical Orbits
i. Most satellites follow elliptical
orbits. (Oval shape)
ii.When a satellite follows an elliptical
orbit its distance from earth varies.
iii.When a satellite is closest to earth
during its orbit it is called perigee.
Elliptical Orbits
iv.
v.
When a satellite is furthest from earth during its orbit
it is called apogee.
When satellites come to close to earth’s surface during
apogee they are greatly affected by earth’s atmospheric
air resistance and are slowed down. After many passes
the satellite’s orbit can be greatly slowed down and
altitude decreased. This can cause the satellite to burn
up or fall to earth.
Satellite Exploration
a.Satellite Exploration of Earth
i. The Landsat satellites are a set of
satellites used to explore the features
of earth.
1.These satellites can detect features
such as cities, vegetation regions,
rock types, etc...
Satellite Exploration
The Global Positioning System, or GPS,
is a network of satellites used for
accurate navigation of ships, aircraft, or
personal navigation.
1.These satellites can detect accurately
detect an objects location on earth.
iii.Space shuttles are temporary satellites
that are designed to carry cargo, orbit the
earth, and return to earth.
ii.
The End!
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