Linked Questions

6 votes
3 answers
2k views

Determining GEO Orbital Slot from TLE

I'm trying to figure out the equation based on TLE data which orbital slot a GEO satellites occupies. I have the TLE data imported into R and I wish to know what satellites are in adjoining GEO ...
2 votes
1 answer
296 views

In MATLAB, Computing a new TLE/orbit following a delta-v impulse?

I have already worked on this project for a week, and I still can not solve this problem by myself. How can I update data for the SGP4 OrbitPropagator in Matlab's ...
3 votes
1 answer
412 views

Calculating and Drawing the orbit of a body in a 2D gravity simulation in python

I'm making a space exploration game and its in a 2d plane so no z axis, and I'm using Newton's law of universal gravity, I would really like to calculate anddraw the predicted trajectory of a body, ...
4 votes
1 answer
323 views

How do I obtain geocentric position vectors at three successive times before I use Gibbs' method?

I would like to try out Gibbs' method of preliminary orbit determination, which requires that from observations of a space object at the three successive times $t_1$, $t_2$ and $t_3$ ($t_1 < t_2 &...
5 votes
2 answers
2k views

How do SDP4's "Deep space" corrections to SGP4 account for the Sun's and Moon's gravity?

The Simplified Perturbations model SGP4 is used to calculate Earth satellite state vectors (position and velocity) using standard ephemeris data encoded as TLEs (Two Line Elements). According to ...
7 votes
3 answers
10k views

How to generate TLE file?

Subsequently to this answer: What is the way of generation of TLE file for a satellite? How to deal with BSTAR drag term, mean orbital elements, etc.? The generated TLE will be used as the input for ...
4 votes
1 answer
531 views

Plot ellipse using elements from TLE

I am trying to draw an ellipse as satellite orbit in three.js, It has an EllipseCurve class which takes these inputs and draws an ellipse around center. EllipseCurve( aX : Float, aY : Float, xRadius : ...
3 votes
3 answers
3k views

How to calculate cone angle between two satellites given their look angles?

I have the azimuth, elevation and distance of 2 satellites relative to a ground station, defined by latitude and longitude, as I've discussed in my previous question. I'm using the satellites' TLEs ...
4 votes
2 answers
2k views

Propagating satellites without TLE in python

I know how to propagate satellites in python using ephem module (that uses TLE data). However, I am not sure how I would do the same for my own set of orbital ...
4 votes
3 answers
266 views

Why can Amazônia-1 observe the Amazon "every day or two" while Landsat takes 16 days between observations? Is "orbital magic" at play here?

The news item in Science Brazil’s first homemade satellite will put an extra eye on dwindling Amazon forests says: Right now, Brazil’s Amazon monitoring program relies on flyovers from the U.S. ...
31 votes
2 answers
4k views

Which LEO satellite lost over 30 km of altitude in the geomagnetic storm of 13-14 March 1989?

This answer includes the following information: During the great geomagnetic storm of 13-14 March 1989, tracking of thousands of space objects was lost and it took North American Defense Command (...
1 vote
2 answers
1k views

Visualising orbits from different viewpoints in Python

I have a python program that I use to visualise a planetary orbital system. I convert the orbits to xyz coordinates and then have a basic orrery that views the system from 'above', by simply plotting ...
5 votes
0 answers
500 views

Where can I find data on satellite orbits?

I'm an enthusiast who'd like access to satellite orbital data to simulate / plot trajectories of manmade satellites (of any kind) on my home computer. Where's the best place for me to find this kind ...
4 votes
2 answers
2k views

How can I calculate if a satellite is currently in sunlight or eclipse using pyEphem or Skyfield (preferred)?

I'd like to add this to some existing python scripts to model cubesat battery life and payload temperature but the math escapes me.
23 votes
4 answers
8k views

Starman/Roadster in a=1.795 AU orbit, now what's the method to this madness?

The question SpaceX's 4,425 satellite constellation - what's the method to the madness? received an excellent answer explaining the rationality behind the madness plan. Elon Musk's tweet (spotted ...

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