3 votes

Is it possible to change a satellite's eccentricity without changing semimajor axis (instantaneous maneuver paradigm)? What else needs to "give"?

Is it possible to change a satellite's eccentricity without changing semimajor axis (instantaneous maneuver paradigm)? Sure. From the vis-viva equation, $v^2 = \mu\left(\frac2r-\frac1a\right)$, you ...
David Hammen's user avatar
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3 votes
Accepted

Radial hyperbolic trajectories

$$t( x, w ) = \frac{ \sqrt{ (|w|x)^2 + |w|x} - \ln\left(\sqrt{|w|x} + \sqrt{1 + |w|x}\right) }{ \sqrt{2\mu \, |w|^3} }\tag{1}$$ where $x$ is the separation and $w$ is a negative magic number defined ...
David Hammen's user avatar
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3 votes

Integration of Varying Forces, Impulses in Simulators

Now I'm using an RK4 integrator, (1st case) we assume that the forces are uniform all throughout one integration time step. (is this correct?) That is not correct. The point of using a multiple stage ...
David Hammen's user avatar
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1 vote

How long does one orbit around the Moon take in a typical parking orbit for a stage a lander is going to meet?

There is a nasty little detail about establishing orbits around the Moon: they won't stay there. That is, they will distort over periods of time as short as a few weeks, depending on orientation and ...
Chris Ison's user avatar

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