A geostationary (Clarke-band) satellite at Albany's longitude will a always be visible from Albany b never be visible from Albany c sometimes be visible from Albany
Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
A geostationary (Clarke-band) satellite at Albany's longitude will
| a |
always be visible from Albany |
|
| b |
never be visible from Albany |
|
| c |
sometimes be visible from Albany |
Geostationary satellite has a time period of rotation equal to 24 hours if the circular orbit is on the equatorial plane of the earth, then the satellite will appear stationary at a point on the equatorial region of the earth.
As Albany is situated on that region so the satellite at Albany's longitude will always visible.
Heights for geostationary satellite will be given by - h
RE+h = (T2GME/4π2)1/3
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