To stay in orbit, a satellite has to travel at a very high velocity, which depends on the height. So, typically, for a circular orbit at a height of 300 km above the Earth's surface, a speed of 7.8 km/s (28,000 km/h) is needed. At this speed, the satellite will complete one orbit around the Earth in 90 minutes.
In this manner, how many times does a satellite orbit the Earth in a day?
In our animation, it goes around twice in one day. In reality, the satellite may orbit Earth once every hour-and-a-half or so, going around many times per day. An example of satellites in polar orbit are the three POES* satellites.
Likewise, what determines orbital speed?
The speed of an object's orbit around earth depends on the object's axis - find out how here. Objects captured by the Earth's gravitation typically have elliptical orbits. The mean orbital speed of the object depends only on the Earth's mass and the semi-major axis (half the longest diameter) of the object's orbit.
How do satellites maintain speed?
A satellite maintains its orbit by balancing two factors: its velocity (the speed it takes to travel in a straight line) and the gravitational pull that Earth has on it. Satellites do carry their own fuel supply, but unlike how a car uses gas, it is not needed to maintain speed for orbit.
Which country has highest number of satellites?
While the U.S. is the country with most satellites in space (830), multinational cooperations come in fourth place.