Predict Satellite Sighting: A Space Engineer's Guide

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SUMMARY

The discussion focuses on predicting satellite sightings from a specific latitude and longitude on Earth, particularly for satellites in a circular orbit at an altitude of 350 km. Key concepts include understanding the Earth's curvature, the satellite's average speed, and the inclination angle to the equator. Participants emphasize the importance of visualizing the scenario by drawing diagrams to represent the Earth and the satellite's orbit, which aids in calculating the angles for when the satellite will be visible above the horizon. Spherical trigonometry is identified as a necessary tool for more precise calculations.

PREREQUISITES
  • Understanding of basic physics principles related to motion and orbits
  • Familiarity with spherical trigonometry
  • Knowledge of Earth's radius and curvature
  • Ability to visualize geometric relationships in three-dimensional space
NEXT STEPS
  • Study the principles of satellite motion and orbital mechanics
  • Learn about spherical trigonometry and its applications in navigation
  • Research tools for visualizing satellite paths, such as satellite tracking software
  • Explore the effects of Earth's wobble and other perturbations on satellite visibility
USEFUL FOR

Space engineering students, aerospace engineers, and anyone interested in satellite tracking and orbital predictions will benefit from this discussion.

jstrz13phys
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I am completely lost. I am taking a course in Space Engineering. I have been asked to predict (without a program/software) when I will be able to see a satelite from a given lat, long from earth. I know the altitude is 350KM and I also know the inclination angle to the equator. It is in a circular orbit so I know what the average speed is. What I don't know is where to go next. Everytime I start I get lost - how do I handle spinnig earth, the woble the Earth has from moon, etc.
 
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First law of physics, if in doubt - draw a picture!
Assume you are on the equator (just for starters) draw the circle surface of the Earth and then a parralel circle orbit 350km away.
Draw a straight line at a tangent to where you are standing on the earth, this is the horizon, you can see the satelite once it is above this line.
Knowing the radius of the Earth and drawing a couple of triangles should give you the angle between the satelite rising and setting, since there are 24 hours in a full circle this gives you length of time you can see it from where you are standing.
Obviosuly with no other data you can only give a relative answer in terms of X mins before and after it is overhead.

Beyond that you are going to have to hit the dreaded spherical trig books !
 

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