# Linked Questions

3answers
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### Calculating orbital properties after an instantaneous burn not at apogee/perigee

Logically the problem of a satellite in orbit around the Earth can be fully defined by the position and velocity of the satellite (assuming a perfectly spherical Earth etc.). However when I try and ...
2answers
816 views

### How to find orbital elements of a binary system

I'm trying to find the rate of precession of a binary system consists of two similar mass stars A and B, so I need to find the value of the argument of periapsis $\omega$ first, with velocity and ...
1answer
3k views

### How to calculate new periapsis and apoapsis after orbital velocity change

I'm working on a way of simulating orbits for a video game I'm making. It works by taking the apoapsis, periapsis and current distance and calculating from there the velocity, radial velocity, period ...
1answer
2k views

### Converting Cartesian vectors to Keplerian Orbital elements - having problems

I have my position and velocity vectors, and also the mass and position of the sun. I need to convert my vectors to the Keplerian Orbit elements, but I can't get a definite number when I do. The orbit ...
1answer
806 views

### Help with Cartesian State Vectors → Keplerian Orbit Elements C#

EDIT I am currently attempting to try the standard Cartesian State Vectors to Keplerian Orbit Elements conversion but i am having problems getting my head around the formulas and the use of vectors. ...
1answer
910 views

### Calculating dV to raise apoapsis at an arbitrary point of an orbit

This is similar to another StackExchange post (right down to the Kerbal Space Program mentions), but with a different approach. The question I'm trying to solve is thus: Given current orbital state ...
2answers
258 views

### Orbit, circularizing, apogee/perigee

First - my question: After the orbit insertion, in the coast stage, and assuming perigee is out of the atmosphere, and neglecting any external forces and influences - is the orbit now "fixed"? As in, ...
1answer
431 views

### Can I convert from TEME to Keplerian orbital parameters?

I'm a MSC student in computer science. For my thesis I'm using SGP4 tool to propagate a LEO satellite. If I have understood rightly, the SPG4 returns the two state vectors r and v in TEME format. (...
1answer
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### How would off-apsis burn effect the angle and position of new apoapsis

Let's say you have an elliptical orbit, if you burn prograde at the periapsis, you extend the apoapsis by some factor(according to vis-viva equation). But if you burn prograde on somewhere during the ...
1answer
657 views

### Keplerian Orbital Elements ↔ Cartesian ECEI with WGS84 Corrections

I'm trying to write code to go back and forth between equatorial KOE (Keplerian Orbital Elements) and ECEI (Cartesian). ECEI→KOE I found here: How to programmatically calculate orbital elements ...
0answers
625 views

### Satellite Ground Track From ECEF Frame Position And Velocity Vector

The above question may sound naive. I am trying to understand how satellite ground track can be computed when satellite position and velocity vectors are available from on-board GPS receiver of a low ...
1answer
317 views

### Compatibility of osculating elements and cartesian vectors given by JPL Horizons?

I'm facing a problem I can't explain and I would like to know if someone has more information about it. I'm drawing a solar system and when I plot earth with the Horizon cartesian coordinates, it ...
1answer
244 views

### How to rotate orbital ellipse when radial velocity is added to the orbital velocity

I am trying to plot an orbit and am having some success. I have directly calculated the orbital parameters so I am able to plot the ellipse. I am also plotting a path of the orbit as a sanity check. ...
1answer
109 views

### What are the symbol definitions in the equations for finding orbital elements?

I've been looking at the answer to this question on how to convert position and velocity to orbital elements, but some of the symbols are not defined and there are no reference links for those symbols....
0answers
127 views

### Recalculate Orbital Elements after a ΔV

I would like to write a program able to simulate a keplerian orbite given an initial position and velocity (r0, v0) and able to manage accelerations in different directions. To simulate the orbit, I ...