# how satellites have the same angle ordered in orbit ??

Discussion in 'Homework Help' started by rawanayyoub, Nov 6, 2012.

1. ### rawanayyoub Thread Starter New Member

Oct 9, 2012
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0
Hi all,
please I need to know how are "more than one" satellite have the same angle or it have the same latitude value such that Nilesat all its satellite ( nilesat 101 , Nilesat 102, Nilesat 103 .......... etc ) have 7 degree West , I mean how is it could be in the orbit ??!! if any one can explain using Picture.

Rawan Ayyoub

Apr 5, 2008
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3. ### WBahn Moderator

Mar 31, 2012
18,085
4,917
Take most of what is in that second link with a big grain of salt -- it is written by someone that thinks the Earth is the center of the universe and that the universe rotates around the Earth.

The wikiarticle was interesting. I was unaware of the use of a graveyard orbit or how much less expensive it is than de-orbiting a satellite.

To answer the OP's question (I hope), the reason that multiple satellites can be parked at the same nominal position is that the arc is very big. At a orbital radius of 26,200 miles, the geostationary ring has a circumference of nearly 165 thousand miles. Each degree of arc is thus 457 miles wide. You can park several satellites in that space while keeping them far enough apart so as not to bump into each other or to interfere electronically with each other. I think they like to keep the slots at least 0.1 degree apart, but that would allow a maximum of about 3600 geostationary satellites and there are currently about 300 of them. But, of course, certain sections of the sky are much more desirable than others, so some sections are very crowded.

4. ### nsaspook AAC Fanatic!

Aug 27, 2009
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Most of the new birds also use spot beams for selective area coverage so the same frequency transponders can deliver different channels to receivers all tuned to the same frequency but in different locations. This can reduce the number of satellites needed at each prime location.
http://www.satelliteone.com/support-files/Spot_Beam_Short.pdf

World wide satellite information on free TV and Radio.
http://www.lyngsat.com/
Most of the free channels for your area can be seen with a simple KU/KA band dish.

http://myplace.frontier.com/~zoneminder/sitebuildercontent/sitebuilderpictures/100_0016.jpg
http://myplace.frontier.com/~zoneminder/sitebuildercontent/sitebuilderpictures/100_0017.jpg