Satellites used for telecommunications rely are kept in a geostationary orbit. A satellite is said to be in such an orbit when : 1. The orbit is geosynchronous. 2. the orbit is circular. 3. The orbit lies in the place of the Earth’s equator. 4. The orbit is at an altitude of 22,236 km. Select the correct answer using the codes given below:

A geostationary orbit (GEO) is a specific type of geosynchronous orbit. For a satellite to appear stationary relative to a fixed point on Earth, it must satisfy three primary conditions: the orbit must be geosynchronous (matching Earth's sidereal rotation period of approximately 23 hours and 56 minutes), it must be perfectly circular (zero eccentricity), and it must lie exactly in the plane of the Earth's equator (zero inclination). While statement 4 mentions an altitude of 22,236 km, the actual altitude required for GEO is approximately 35,786 km (which is roughly 22,236 miles) [1]. Therefore, statement 4 is incorrect due to the unit error (km vs miles). Consequently, only statements 1, 2, and 3 are correct characteristics of a geostationary orbit.

Sources

1. [1] https://www.sciencedirect.com/topics/engineering/equatorial-orbit