# Questions tagged [low-energy-transfer]

Questions on trajectories that allow spacecraft to change orbits using very little fuel.

23 questions
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### Is it possible to change to different orbit inclinations with a simple push?

Supposedly launching to different orbital inclinations is quite difficult, with launchers trying to launch from different launch sites to using mid air launches to avoid geographic restraints. If a ...
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### Need help with selecting research papers for Cycler Trajectories

I have been reading small articles on Cycler trajectories and have found it to be quite interesting. So, I was wanting to do some research work in this area and I need help in acquiring research ...
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### Low arrival V-infinity?

So I am modelling an Earth - Mars low thrust trajectory in a simple manner. I'm telling my model to not model any trajectories where the spacecraft is moving any more than 200 m/s quicker or slower ...
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### MATLAB optimization script for Low - Thrust trajectory

I'm trying to write a script for a 'shape based' trajectory, based on the exponential sinusoid shape, for an Earth - Mars transfer. Essentially, I know where I want to start, and I know where I want ...
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### Locally optimal control for low thrust transfers with J2 and other Earth perturbations

Background As detailed in this answer low thrust optimization is subject of ongoing research. There are a few closed-loop control laws which allow to achieve a locally optimal (but close to globally ...
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### Is the Uphoff-Crouch cycler orbit with 3 passes impossible?

A previous question I asked here got clarification on the Earth-passing phases of the Lunar Cycler orbits that use the "backflip" maneuver. It came up in the book Artemis, and it used the name Uphoff-...
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### Secular variation of orbital elements and influence of force components

According to (Burt, 1967)[1], the transverse component of the perturbing force (that is: contained in the plane of the orbit and perpendicular to the radius vector) is the only one that affects ...
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### Electromagnetic accelerator in space

Let's imagine there are already interplanetary spacecrafts and travel. Would it be possible to create electromagnetic accelerator somewhere in the outer space? It would work this way: There would be ...
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### Change of inclination using low thrust

I am studying low-thrust maneuvers, in particular a change of inclination only. According to (Ruggiero et al., 2011)[1], if one writes the perturbation force in the Gauss planetary equations in terms ...
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### How does bi-elliptic transfer compare to Low Energy transfers / Interplanetary Transfer Network?

I know this is a bit of apples-to-oranges comparison, since bi-elliptic transfer is a purely mathematical construct in a two-body problem, while ITN is a great "maze of opportunities" based on the ...
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### Transfer between elliptical orbits

For circular orbits the most efficient transfer is achieved with a hohmann transfer or a bi-elliptic transfer. But what is the most efficient way to transfer between elliptical orbits? I assume in ...
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### Do all spacecrafts first enter orbit and then transfer to another body? [duplicate]

I would like to know if all spacecraft that have visited other planets first orbited our own planet and then performed an orbital transfer, or if there have been some that just went directly to the ...
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### Low Energy Transfer within Earth-Moon system

Practical aspects of a total low energy transfer to the Moon have been seen in missions like GENESIS, which uses Weak stability Boundary legs of Earth and Sun to reach ESL-2. This four body model ...
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Background In airports and shopping malls multiple, parallel moving "slidewalks" allow people to increase their velocity from a low speed to a high speed. Overview Consider the following image: ...
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### What is the least energetic trajectory design to send uncrewed supplies to Mars?

Both Mars One and NASA have suggested sending uncrewed supply ships to Mars as part of a manned mission or colonization. These payloads can take all the time they like, not being constrained by human ...
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### Gravity braking and orbit around same body in Low energy transfers

I recently read the discussion in the question, Gravity Assist Braking that momentum degradation used while entering in the opposite direction to the body's rotation in the Hill's Sphere of that body ...
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### Are L1 to L2 and back “cheap” transfers/cyclers possible?

This paper studies transfers from halo orbit to halo orbit in the Jovian system. I wonder if there are any locally stable orbits connecting Earth-Moon L1 and L2 points. EDIT: One should also consider ...
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### What is a hyperbolic rendezvous?

I am reading this paper about cyclers between Saturn and some of it's moons. In the beginning is discusses the Earth-Mars cycler as "suffering" from the "risky requirement to perform hyperbolic ...
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### Cyclers To Mercury?

Is it possible to establish a practical 'cycler' transportation system between Earth and Mercury? The concept involves a small, manned payload (7.5 mt or less) doing the Earth departure and Mercury ...
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### Is it possible to “map” the Interplanetary Transport Network?

Cartographers have always been valued members of any exploration team. Even the teenage George Washington had experience with the "compass and chain." Every Terra Incognito is in need of a good map. ...
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### What does the BackFlip lunar cycler do in its pass by Earth?

This paper describes an Earth-moon cycler orbit. In this concept, a 180 degree "BackFlip" is used to modify a more simple cycler orbit. However, I can't figure out what cycler orbit it modifies, and ...