Introduction to Spaceflight 23.06

Considering an optical payload, for a given wavelength and altitude; if you increase the aperture radius of the optic, the Ground Sampling Distance (GSD), will:

• Increase linearly  

• Decrease linearly  

• Increase quadratically  

• Decrease quadratically  

How many quantities are needed to describe an orbit mathematically? 

• 5

• 6

• 7

• 8

If the satellite is operating, what is an acceptable temperature for the electronics? 

• 1. The same of the external space 

• 293 Kelvin

• – 50 Celsius 

• 343 Kelvin 

What is the name of the phenomenon where charged particles from the Sun interact with Earth's magnetosphere, causing colorful displays in the polar regions?

• Solar wind 
  

• Aurora

• Solar eclipse

• Van Allen Belt

Which of the following antenna radiates the power uniformly in all directions? 

• Isotropic 

• Directional 

• Conical Antenna 

• Helix Antenna 

Which technologies are affected by space weather? 

• telecommunication disturbance on earth

• satellite operation  
  

• power grid on earth 
  

• All of them

Which maneuver requires continuous thrust in order to increase the altitude of a spacecraft? 

• Hohmann Transfer

• Spiraling

• Gravity Assist

• Bi- elliptical Transfer

What CANNOT you use to modify the attitude of your satellite?

• Reaction Wheels  

• CMG 

• Magnetometers 

• Thrusters 

Which one of the following sensors has the best accuracy? 

• Star sensor 

• Sun sensor

• Earth sensor 

• Reaction Wheel 

What is the usual RPM limit for a Reaction Wheel? 

• 50000 rpm 

• 50 rpm 

• 5000 rpm 

• 500 rpm