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How many GPS Satellites does the US Deptartment of Defense have?
There are currently 30 healthy GPS satellites in orbit.
Why are ground stations in continuous contact with satellites in geostationary orbit?
Just imagine managing a system of communication satellites which were non-geostationary. Data needs to be sent to one city, one home, but the satellite for the job is different every time. The task would be manageable, but unnecessarily difficult. Further more, metropolises must have priority over small towns- or oceans. New York needs more satellites than Apple Creek Ohio or the Atlantic Ocean. Finally, many satellites serve a very specific audience. Your favorite radio station would almost never come into reception if the satellite broadcasting it is circling the world.
What is the inclination of a satellite to the earths equator?
There is no set inclination of a satellites orbit to the earth's equator. Once in space, the spin of the earth or where it's poles happen to be become irrelevant to the satellite. Many satellites like spy and weather satellites orbit over the two poles (north and south) while communication satellites are placed in orbit directly above the equator at a height that is synchronised with the earth's orbit. This way they stay permanently above the same place on the equator and do not APPEAR to move at all.
How many minimum number of geostationary satellite needed for uninterrupted global coverage?
In theory, 2 satellites in diametrically opposite geosynchronous orbits could cover the planet. In order for the satellites to communicate, a minimum of 3 would be needed, each at a 60 degree angle to the others. At this point, the strength and quality of coverage increases proportionally to the number of satellites.
What is the satellite that always stays over one spot on Earth?
A "geo-synchronous" orbit is one in which a satellite orbits in exactly 23 hours 56 minutes, the same rate at which the Earth spins. So while the satellite is moving and the Earth is moving, they are moving together at the same angular speed. This only works for equatorial orbits.
How many miles above the Earth are satellites typically positioned?
Satellites are typically positioned around 22,236 miles above the Earth in a geostationary orbit.
When was satellite radio invented?
The idea of sending a satellite to geostationary orbit was first published in 1928 by Herman Potocnik, however this was widely overlooked. Science Fiction writer Arthur C. Clarke is often credited for the proposal of creating geostationary communication satellites after his article "Extra-Terrestial Relays--Can Rocket Stations Give Worldwide Radio Coverage?" was published in the magazine Wireless World in 1945. However, it wasn't until 1964 that Syncom 3, the first geostationary satellite, was actually launched. Since then, many satellites have been sent to geostationary orbit. Most communication and broadcast satellites use a geostationary orbit because it is ideal for sending signals to a specific region.
How many geostationary communications satellites are in service today?
300
How many days does it tack to orbit the Earth?
The ISS orbits the Earth in about 90 minutes. Some satellites are in geostationary orbit, orbiting in exactly one day. The Moon orbits (moves around) the Earth in about 28 days!
Why are there so many Iridium satellites in orbit?
It takes that many to provide complete coverage of the Earth, including the polar regions.
How many satellites orbit Saturn?
there is no satellites orbiting Saturn
How many satellights are there?
There are thousands of satellites in Earth's orbit, with estimates ranging from 2,200 to over 3,000 active satellites. Additionally, there are many more inactive or defunct satellites and debris in orbit.
Is any kind of satellite stationary in the night sky?
Yes. There are many satellites that are geostationary. That is they remain fixed over the same relative position of the Earth. In the night sky, it would appear to not move in relation to the background stars and other stellar bodies.
Do all satellites orbit the same direction?
No, all satellites do not orbit Earth at the same altitude. An good overview of this can be found on http://www.idirect.net/Company/Satellite-Basics/How-Satellite-Works.aspx. This overview reviews Low Earth Orbit, Medium Earth Orbit and Geostationary Orbits.
How many satellites does the Iridium project use?
It uses 66 small satellites in low earth orbit
Why do satellites have a period of rotation equal to the earths period of rotation?
Some satellites cover the whole earth each pass, because that is what they are used for. However, many also cover nly certan regions such as the poles or the equator or one continent or one country. Geostationary orbiters for example, stay above the same place forever (that is, until they are taken or sent down by something). Many orbit over the same places each time, covering the same regions each pass. This is true of all satellites, the difference is how large the regions are nd how many of them. Some satellites cover the whole earth each pass, because that is what they are used for.
Is there satellites that orbit mars if so how many?
2
