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Rotational Behaviour Saturn
There are various types of satellites.
They are Astronomical satellites, Communication
Satellites, Earth Observation Satellites, Navigation
Satellites, Reconnaisance satellite, Solar Power
satellites, Weather satellites and Miniaturized
Astronomical staellites are those which
are used for observation of distant planets,
galaxies, and other outer space objects.
Astronomical performance from the Earth’s
surface is limited by Earth’s atmospheric
conditions. It makes it even more worse
by the filtering and distortion of electromagnetic
radiation. This makes it desirable to place
astrononomical observation devices into
But space-based astronomy is even more
important for frequency ranges which are
outside the optic and radio window. For
example, X-ray astronomy is nearly impossible
when done from the Earth, and has reached
its current important stand within astronomy
only due to orbiting satellites with X-ray
telescopes.Infrared and ultraviolet are
also greatly blocked.
Communication satellites are satellites stationed
in space for the purposes of telecommunications.
Most communications satellites use geosynchronous
orbits or near-geostationary orbits. Some recent
systems also use low Earth-orbiting satellites
for this purpose.
These satellites are useful for
fixed services as well as mobile applications.
For fixed services, they provide a technology
complementary to fiber optic sub marine communication
cables. It is useful for communications to ships
and planes for which other technologies are impractical.
These are satellites specifically designed to
observe Earth from orbit, intended for non-military
uses such as environmental monitoring, meteorology,
map making etc. Geostationary Operational Environmental
Satellites, Himawari, Misc ets are some of the
earth observation satellites.
The satellites which use radio time signals transmitted
to enable mobile receivers on the groung are called
navigation satellites. These satellite navigation
systems are enabled to measure the location to
accuracies on the order of a few metres in real
The first satellite navigation
system was Transit of which the operation was
based on the Doppler effect. Here, the satellites
traveled on well-known paths and broadcast on
a well known frequency were the received frequency
will differ slightly from the broadcast frequency
because of the movement of the satellite with
respect to the receiver. By monitoring this frequency
shift over a short period, the receiver can determine
its location to one side or the other of the satellite.Several
such measurements combined with accurate knowledge
of the satellite's orbit can fix a definite position.
Satellite navigation is widely
used for military applications. Thus it can be
regarded as a force multiplier. In particular,
the ability to reduce unintended casualties has
particular advantages for wars and hence is an
essential asset for any aspiring military power.
Solar Power Satellites
The proposed satellites built in high earth orbit
that use micro power transmission to beam solar
power is called solar power satellites. These
solar power is beamed to a large antenna on earth
where it can be used in place of conventional
A type of artificial satellite, weather staellite
is mainly used to monitor weather and climate
of the earth. City lights, fires, pollution, auroras,
sand and dust storms, snow cover, ice mapping,
ocean currents, energy waste, etc., are other
environmental information collected from weather
The first weather satellite was
Vanguard 2 which was designed to measure cloud
cover. But TIROS 1 was considered to be a successsful
Miniaturised satellites are recent artificial
satellites of low weights and samll sizes. One
reason for this miniaturisation of satellite is
reduction in cost and constellations for low rate
communications. Hey also allow for cheaper designs
as well as feasibility of mass production.
There are many counties that
are capable of placing satellites in orbits including
the production of launch vehicles. Some are Russia,
US, France, Japan, UK, India, and Israel.