25 votes

Are there any studies about "ping pong" cyclers between gas giants?

In a sense, this "ping pong" is what cycler orbits attempt to do, you are just overestimating the power of flybys. To make the distance between Jupiter and Saturn in just 4 years (one way?), ...
SE - stop firing the good guys's user avatar
16 votes
Accepted

How high did Philae bounce?

According to ESA's 2014 article Three touchdowns for Rosetta’s lander, Philae rebounded off the surface at 38 cm/s and reached a maximum altitude of approximately 1 km above the surface. Note that ...
Darth Pseudonym's user avatar
12 votes
Accepted

Venus-Mars-Venus cycler?

Is it possible to create a cycler that can travel from Venus to Mars, then back to Venus? Yes. When only two planets are involved, there are several infinite families of cycler orbits. Given the 434 ...
SE - stop firing the good guys's user avatar
12 votes
Accepted

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

No, a small push will not change a satellite's inclination by 90°. Remember that, when in low Earth orbit, a satellite is already travelling some 7-8km/s. A small push of only some m/s will leave the ...
Jack's user avatar
  • 9,976
10 votes
Accepted

Change of inclination using low thrust

I found this kind of counterintuitive as well at first. This is the way I rationalized it to myself: consider a high-thrust maneuver to change inclination. Obviously if it's impulsive, you perform it ...
Chris's user avatar
  • 663
10 votes

Are there any paths in the Interplanetary Transport Network that leave the solar system?

The Interplanetary Transport Network is not a particularly useful element of human spaceflight because the paths required are mostly extremely slow. It's possibly interesting as an explanation for how ...
Darth Pseudonym's user avatar
9 votes

Why does the Buzz Aldrin Mars Cycler not play a larger role in planning for Mars exploration?

A cycler makes sense where there is expected to be a small but steady shuffle of humans back and forth between Earth and Mars on a fixed timeline. Notably boarding and leaving a cycler involves more ...
GremlinWranger's user avatar
9 votes

Is it possible to "map" the Interplanetary Transport Network?

The Lagrange 1 and Lagrange 2 regions are the hubs of the trajectories that Ross, Lo, Martin, and Belbruno advocate. Szebehely developed equations to find the L1 and L2 regions. Using his equations I ...
HopDavid's user avatar
  • 15.7k
8 votes

Transfer between elliptical orbits

It is my belief that a bitangential transfer between two coplanar orbits is best. For such a transfer, no direction change is needed at departure or arrival since velocity vectors are parallel at ...
HopDavid's user avatar
  • 15.7k
7 votes

What uses would the Aldrin-Cycler have?

Well, you might get a huge amount of data back by putting a satellite with optical comms on a cycler orbit. A small(ish) satellite on a cycler orbit would pass by Mars and Earth with regular frequency,...
Josh Vander Hook's user avatar
7 votes
Accepted

Are there any paths in the Interplanetary Transport Network that leave the solar system?

I think this basically amounts to asking whether objects can be dynamically ejected from the solar system, and, in general, whenever there is an unstable orbital configuration, eventual ejection of ...
Mark Foskey's user avatar
6 votes
Accepted

Would it be practical to fly a probe to Mars using gravitational assistance from Venus?

It is not practical to use Venus to get to Mars in all but one circumstance. I searched for Earth-Mars and Earth-Venus-Mars (EVM) trajectories in a 900 day launch period starting Jan. 1st 2024. The ...
BrendanLuke15's user avatar
5 votes

Change of inclination using low thrust

I would like to share a GMAT example that demonstrates the thrust node changes for the low thrust satellites. In this case my example relays on electric thrust with low Isp and N. Finite burn at the ...
Onur Gürdoğan's user avatar
5 votes

Transfer between elliptical orbits

I can give you an upper bound for the necessary $\Delta v$, between all elliptical orbits, regardless of inclination. You can always do a bi-elliptical transfer, performed by almost reaching escape ...
SE - stop firing the good guys's user avatar
5 votes
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How does bi-elliptic transfer compare to Low Energy transfers / Interplanetary Transfer Network?

To enjoy a bi-elliptic savings, destination needs to be greater than destination orbit by a factor of 11.94 or greater. Going from LEO to the moon certainly qualifies: 384,400/6678 = ~58. I'll pull ...
HopDavid's user avatar
  • 15.7k
4 votes

Low Energy Transfer within Earth-Moon system

Wow, three years and still no answers!. I will give it a try. What I am going to answer applies just for transfers between periodic orbits at the Lagrangian points (the OP asked so many things but I ...
Julio's user avatar
  • 1,772
4 votes
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Secular variation of orbital elements and influence of force components

The formulas (15) and (17) are given under the assumption that both $f_1$ and $f_2$ (the radial and the transverse components of the perturbing force) stay "sensibly constant over one orbital period". ...
Litho's user avatar
  • 2,040
4 votes
Accepted

Range of travel time between particular planets using the Interplanetary Transport Network/Interplanetary Superhighway?

A dynamic system, with at least 3 massive bodies, will have chaos that can, in theory, be exploited to reach (almost) arbitrary positions within said system at close to zero $\Delta v$ over very long ...
SE - stop firing the good guys's user avatar
4 votes

How are Interplanetary Transport Network/Weak Stability Boundary paths calculated?

Mathspeak answer: The pathways of the Interplanetary Transportation Network (ITN) are determined using numerical analysis of a dynamical system of equations of motion to find invariant manifolds which ...
Woody's user avatar
  • 21.4k
3 votes

To go from LEO to LLO describe a Bi-elliptic/Hohmann transfer burn sequence?

These all look like real trajectory design concepts, so let's go through them in reverse order: incrementally enlarging LEO to MEO to GEO and finally reach the equilibrium point where Earth's ...
SE - stop firing the good guys's user avatar
3 votes
Accepted

Travel time from lunar orbit (EML2) to Jupiter using skyhook only?

Transfer Regardless of how escape from the Earth system is achieved, orbital mechanics pose some restrictions on travel time. The minimum velocity transfer possible is an elliptical transfer orbit ...
SE - stop firing the good guys's user avatar
3 votes

What is the cheapest possible way to land a crew of 2 on the moon?

While the overall scope is too broad, let me address the "low energy transfer" part. Firstly, the idea of "gradually increasing apogee" doesn't save you any fuel. Chandrayaan-2 did ...
SE - stop firing the good guys's user avatar
3 votes
Accepted

Electromagnetic accelerator in space

According to Newton, for every action there is an equal and opposite reaction. As the magnets were applied to the craft, it would apply as much force on the accelerator. The accelerator would have to ...
Ashlar's user avatar
  • 376
3 votes

Change of inclination using low thrust

This is a well-known phenomenon in helicopter dynamics and in control systems. In a second order control system (which roughly describes your low-thrust scheme), the phase angle change is 90° when the ...
ujs's user avatar
  • 31
3 votes

Is the Uphoff-Crouch cycler orbit with 3 passes impossible?

Set your time and length units to LD and lunar period and you can lose the 2 pi and mu. $T=a^{3/2}$ So if you wanted an ellipse whose period was 2/3 that of the moon you'd have $2/3=a^{3/2}$ $2/3^{...
HopDavid's user avatar
  • 15.7k
3 votes

Cyclers To Mercury?

Usable Mercury cyclers exist. Given the large inclination of Mercury, we want the encounter to happen along the line of apsides, thereby requiring a quasi-periodic stationary cycler. The simplest ...
SE - stop firing the good guys's user avatar
2 votes

Transfer between elliptical orbits

I don't know the answer for certain, but am willing to hazard a guess that the most efficient way of transferring between a circular orbit and an elliptical orbit, assuming for a moment that they are ...
user's user avatar
  • 7,322
2 votes
Accepted

Is the Jacobi constant stationary along a periodic orbit?

Yes it is constant along the trajectory as the Jacobi energy is computed using the initial state vector. From Wikipedia's Jacobi integral: In celestial mechanics, Jacobi's integral (also known as the ...
John's user avatar
  • 1,377
2 votes

Are there any paths in the Interplanetary Transport Network that leave the solar system?

Answer: NO ITN manifolds always connect two LaGrange points. There are no manifolds heading out into interstellar space because there are no LaGrange points out there.
Woody's user avatar
  • 21.4k
2 votes

How would one identify ionic thrust vs chemical thrust in an orbit transfer?

This is possibly a bit of a stretch, so do correct me if I am wrong. Let's assume you have access to the TLE data of the satellite. You could compare the ballistic coefficients of the object before ...
hi-bye125's user avatar
  • 370

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