Questions tagged [gravity-assist]

Questions regarding the use of an object's gravity to change the velocity of a spaceship.

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What delta-v for launching Trojan asteroids or outer Jovian moon ice to crash into the earth's moon (using Jupiter gravity assist)?

Is it feasible to utilize Trojan asteroids or an outer moon of Jupiter as a water resource for Luna (earth's moon)? What would be the approximate delta-v requirements to mine ice from a Trojan ...
deepthoughts408's user avatar
2 votes
0 answers
73 views

How is the trajectory of a gravitational assist flyby mission computed?

Based on much research after posing my previous question, as well as the discussions with the rest of the community, I now (think I have) a deeper understanding of how mission planning works. Based on ...
hi-bye125's user avatar
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Can a gravity assist be designed without using simulation?

Suppose a three body scenario with an artificial satellite, a planet (much massive than the satellite), and a sun (much massive than the planet). There is no other significant force on these three ...
paki eng's user avatar
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1 answer
203 views

What speed could you achieve by slingshotting around earth from moon?

Imagine Apollo 13 had fuel to burn engines on the way back to earth but instead used earths gravity to accelerate and the slingshot around earth
Zach's user avatar
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3 votes
1 answer
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Can a ship's thrusters amplify a gravity assist?

If a ship successfully absorbs a planet's kinetic energy to increase its speed, can it add to that speed by firing its thrusters? Thank you very much.
Mike Tuggle's user avatar
5 votes
1 answer
2k views

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

Imagine arriving at Saturn, jettisoning your passenger cargo, and then utilizing the massive gravitational pull of the gas giant to slingshot back towards Jupiter. Due to the immense mass of these ...
Enoch's user avatar
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7 votes
4 answers
323 views

How to place a satellite in retrograde heliocentric orbit?

Imagine a mission which requires a retrograde heliocentric orbit. How could this be achieved? a direct launch would require ridiculous delta-v. There was a similar delta-v problem placing Ulysses in a ...
Woody's user avatar
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3 votes
1 answer
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Gravity assist (flyby/slingshot) from an asteroid?

Could a spacecraft perform a gravity assist maneuver in an asteroid? Has it ever been done? I tend to think that the asteroid would need to be quite massive for a "significant" change of ...
ikerdc's user avatar
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V infinity matching software for gravity assists?

Is their software someone has already written for hyperbolic velocity matching of porkchop plots to be used to figure out ballistic gravity assists? Doing this in single threaded python requires using ...
Enoch's user avatar
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3 votes
0 answers
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Does Juno have enough fuel to push itself into a more elliptical orbit reaching out to Himalia? [duplicate]

Does the Juno probe have enough fuel to push itself into a highly elliptical orbit around Jupiter so that its apojove would be at Himalia's orbital distance to study Himalia better? Would a gravity ...
Nullnummer's user avatar
5 votes
1 answer
762 views

Can Juno use Jupiter's gravity to alter its orbit so that it goes close to Himalia?

Himalia is the most massive and second largest non-Galilean moon of Jupiter. Yet, due to its distant orbit, we still don't have sharp images of it. Does Juno have enough fuel to alter its orbit with ...
Nullnummer's user avatar
1 vote
3 answers
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Why weren't super heavy lift launch vehicles used for deep space missions?

According to this PDF Cassini-HuygensPDF, we would need to launch 70 tons if we wanted to do a Saturn transfer orbit from a low earth orbit. It says that there are no vehicles in NASA’s stable even ...
A. N Asker's user avatar
2 votes
0 answers
51 views

Where to find detailed information about space mission like Voyager or Galileo

Is there any place aside from NASA-JPL web page, where there is only some general information about the missions, where one can find more in-depth detailed values? For instance, I am looking for the ...
ikerdc's user avatar
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4 votes
0 answers
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How would I or who/what could help me find the trajectory of an "Extended Grand Tour" spacecraft, without having to take a long course on the subject?

(As forewarning, the most integral details of this question are bolded.) For context, I have been writing an alternate history involving the accelerated development of spaceflight technology for over ...
Grant Hartlage's user avatar
7 votes
1 answer
165 views

Could the Moon's gravitational anomalies be used constructively?

The moon has a habit of de-orbiting passive satellites in low orbit because it is not a homogeneous ball. Any orbit therefore passes through different sections with different surface gravities. This ...
bitmask's user avatar
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Patching two Lambert's problem solutions together

I am following this paper on the implementation of a genetic algorithm to find a good MGA trajectory. The way they approach the problem is by solving the Lambert problem for each planetary transfer. ...
ikerdc's user avatar
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1 answer
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How to calculate the max mass and speed of an asteroid capturable by gravity assist?

After reading this question and the answers, I am wondering about the limits of slingshot method to capture an asteroid into a planet orbit. Is it possible to calculate if an asteroid can be captured ...
jumpjack's user avatar
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How to find the hyperbolic angle given the mean anomaly?

I'm modelling a hyperbolic gravity assist trajectory around Jupiter and trying to calculate the coordinates for each hour interval before/after passing periapsis. I've calculated $M_h = 0.0176$ is the ...
Chris's user avatar
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1 vote
0 answers
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More advanced alternatives to Trajectory Optimization Tool?

I've been using Arrowstar's Trajectory Optimization Tool to plan interplanetary transfers, and it works well. The next thing I want to do is plan gravity assists from the Sun-Earth L2 Lagrange point ...
kardalos's user avatar
  • 339
3 votes
1 answer
165 views

Are there any studies on Mars-Earth ballistic cyclers taking Mars-gravity assist into account?

In studies pertaining Earth-Mars cyclers, purely ballistic cyclers are usually relegated to many orbit solutions. For instance the classic Aldrin cycler, while elegant, can't achieve the desired turn-...
Enoch's user avatar
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2 votes
1 answer
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Is there any software or other resources that can find optimal launch windows and gravity assist trajectories involving Lagrange points?

I've been using GMAT to make various trajectories involving the Sun-Earth L2 point. Earth-L2-Mars, Earth-L2-Earth flyby-Mars, etc. However, the main source of optimal launch windows I've been using is ...
kardalos's user avatar
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2 votes
2 answers
377 views

Is there a parameter that describes the angle between the spacecraft's position and the sun angle or direction of the Earth's motion?

I am trying to design an Earth flyby for gravity assist in GMAT, and I know from theory that the spacecraft should pass in front of a planet with regard to its heliocentric direction of motion in ...
kardalos's user avatar
  • 339
6 votes
2 answers
271 views

Starting refueled in LEO, how much payload could a heat-protected Starship softly land on Mercury after a gravity assist from Venus?

This question may be a crucial follow-up to this one because in this answer it is calculated that the payload to Mercury without a gravity assist would probably be minimal, so if already a moderate ...
Cornelis's user avatar
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9 votes
1 answer
265 views

Which moon is best? (for gravity assists)

Inspired by my answer to Is a ballistic Jovian capture using the Galilean moons possible from interplanetary entry? in which I discovered that Callisto offers a stronger gravity assist than Ganymede ...
BrendanLuke15's user avatar
6 votes
2 answers
355 views

Is a ballistic Jovian capture using the Galilean moons possible from interplanetary entry?

While spacecraft like Galileo and Juno did use gravity assist to supplement their insertion burns, as answered here, is it possible to enter Jupiter's orbit without a capture burn?
Enoch's user avatar
  • 317
5 votes
1 answer
587 views

Starship reentry velocity on return from Mars: What are the options

What are the reentry velocity options available to Starship on return from Mars? I assume the approach will be significantly faster than a Hohmann transfer orbit due to timing of transfer windows and ...
Woody's user avatar
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6 votes
2 answers
236 views

Which deep-space spacecraft flew closest by Earth during a gravitational assist?

The extremely cool NASA JPL video Triumph at Saturn (Part I) is really worth a watch and/or listen. (Don't forget Part II as well!) At about 26:30 it discusses ...
uhoh's user avatar
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25 votes
5 answers
6k views

Is there any limit to how many times you can increase velocity by repeated sling shot manoeuvres?

I believe travelling to Alpha Centauri at ~10 km/s would take of the order of 100 000 years (10 km/s is the order of speed of probes currently leaving the solar system). That seems 1. rather a long ...
Raffles's user avatar
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36 votes
1 answer
3k views

Why is there currently so little talk about a Venus gravity assist for a crewed Mars mission?

I just came across this video about manned Mars and Venus missions that were planned in the 1960s. They considered a Venus flyby the best way to get humans to Mars. Indeed, there are also modern ...
KarlKastor's user avatar
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1 vote
1 answer
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What is the maximal gravity assist boost achievable in the Milky Way galaxy using black holes?

This question on the world building site sparked my curiosity on whether we could see signs of an intergalactic civilization. The question itself effectively asks whether this is possible for our own ...
csiz's user avatar
  • 291
2 votes
2 answers
157 views

How will Juice substantially increase its inclination around Jupiter in January 2031?

The ESA video Juice’s Jovian odyssey linked below is quite interesting to watch. Around January of 2031 it substantially increases its inclination around Jupiter. Big inclination changes can be ...
uhoh's user avatar
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4 votes
1 answer
249 views

How difficult to gravity assist brake on entry to Alpha Centauri system? [duplicate]

Say a generation ship arriving at Alpha Centauri A system wants to get into orbit (or land) on an exoplanet there. After decelerating for the 2nd half of the journey, their approach velocity is still ...
Koon W's user avatar
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9 votes
3 answers
779 views

Did the spacecrafts Galileo or Juno use the Galilean moons for a gravity assist before entering Jovian orbit?

Galileo and Juno are the only two spacecraft to have entered orbit around Jupiter. Did either of them use one of the Galilean moons for a gravity brake before in order to enter a stable orbit around ...
Jonathan L.'s user avatar
8 votes
1 answer
165 views

Would the Oberth effect apply to a rocket powered playground swing?

Would the Oberth effect (as explained as an answer to a gravity assist maneuver) apply to an earthbound partial orbit simulator in a strong gravity field, i.e. a playground swing? Imagine a swing with ...
wistlo's user avatar
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16 votes
2 answers
4k views

Would an astronaut experience a force during a gravity assist maneuver?

When an astronaut is inside of a ship accelerating (from engine burns), or decelerating (due to reentry) they experience a tug in a relative direction. Suppose an astronaut is in a space ship that is ...
Ezra Bailey's user avatar
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5 votes
3 answers
1k views

Why is NASA proposing an EMEJ (MEGA) trajectory for Europa Clipper instead of EEJ?

A launch service request was recently put out for Europa Clipper to do a flyby of Mars on its way to Jupiter. How is that a better trajectory than an EEJ, similar to Juno? Launch Vehicle Performance: ...
PearsonArtPhoto's user avatar
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4 votes
1 answer
230 views

Could artificial magnets orbiting the sun be used to accelerate spacecraft, like a magnetic "gravity" assist?

Say there's a powerful magnet in an orbit between those of Earth and Mars. Could a spacecraft traveling between those planets save propellant by performing a slingshot maneuver using its magnetic ...
Wesley Botham's user avatar
0 votes
1 answer
111 views

Gravity assist from Jupiter if leaving Callisto?

If I spacecraft was leaving Callisto to return to Earth, would there by any situation where it would use a gravity assist from Jupiter to increase its velocity?
Bob516's user avatar
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4 votes
3 answers
262 views

How do space agencies choose arrival dates to planets (i.e. Mercury) from a gravity assist (i.e. Venus)?

Assuming I was looking for arrival opportunities from 2020 to 2030, how can I calculate the possible arrival dates to Mercury given a departure date from a gravity assist from Venus?
John's user avatar
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5 votes
2 answers
255 views

Was the gravity assist at Jupiter the most dangerous part of the New Horizons mission?

In terms of success of the mission, was the Jupiter fly-by the time when problems with the flight path was most likely to happen? Was the odds of failure at that point ever studied? If so, what were ...
Bob516's user avatar
  • 6,917
2 votes
2 answers
327 views

Is it more efficient to burn all needed fuel in an Oberth manoeuvre at once or burn a fraction of the fuel for each orbit?

I was looking into Parker Solar Probes trajectory and was wondering what would be the most optimal way to utilize a retrograde thrust at perihelion to reduce the number of needed gravity assists. I ...
Alexander Ivanov's user avatar
5 votes
3 answers
462 views

Speed at aphelion is decreasing for Parker Solar Probe with each new orbit despite being closer to the Sun

Sorry for the really bad picture I am looking at some data from the Parker Solar Probe mission and I was looking at the speeds of PSP at perihelion and aphelion at each new, different, orbit (the ...
Alexander Ivanov's user avatar
2 votes
1 answer
202 views

Effect of incoming velocity on change in velocity in a gravity assist

In a gravity assist does the incoming velocity of a space craft effect how much speed it gains. For example say a rocket was approaching Jupiter for a gravity assist with speed v and another rocket ...
Alexander Ivanov's user avatar
1 vote
1 answer
500 views

Why is the highest speed that Voyager 2 achieved from the Jupiter gravity assist not at perijove?

I plotted some data of the speed of Voyager 2 for various times (around the Jupiter flyby) and noticed that the highest speed that Voyager achieved was not at perijove and was wondering why this might ...
Alexander Ivanov's user avatar
2 votes
0 answers
104 views

Where can I find the specific details of a gravity assist space mission?

0 I am writing a research essay where I need to know the specific details of a gravity assist mission such as Voyager 2's flyby of Jupiter for example (but any mission would work as long as it is a ...
Alexander Ivanov's user avatar
3 votes
1 answer
211 views

What is the relationship between the periapsis altitude and the change in velocity in a gravity assist?

In a gravity assist maneuver if I were to decrease the distance from the rocket to the periapsis of the planet it is orbiting (I believe this is called the periapsis altitude but I may be wrong) it ...
Alexander Ivanov's user avatar
5 votes
4 answers
427 views

Have space probe gone to unplanned destinations?

Reading this question about multiple gravity assists (Why is Voyager 1 faster than all other space probes?), it caused me to wonder if any probes have been redirected to additional (or alternate) ...
Milwrdfan's user avatar
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9 votes
1 answer
488 views

What do the shaded vertical lines in the animation of Gravity assists of space probes, mean?

Example Animations from Wikipedia — https://en.wikipedia.org/wiki/Gravity_assist#/media/File:Animation_of_Voyager_1_trajectory.gif https://en.wikipedia.org/wiki/File:...
Raj Arjit's user avatar
  • 373
8 votes
1 answer
258 views

Is a graviational slingshot around Mercury a feasible solution for space probes?

Our spacecraft have rarely visited Mercury, for reasons obvious to those who know orbital mechanics. The Mariner 10 visit to Mercury was revolutionary by using Venus for the novel slingshot maneuver, ...
uruiamme's user avatar
  • 183
7 votes
1 answer
520 views

Will Dragonfly flyby Jupiter en route to Saturn?

The table on the "Exploration of Jupiter" Wikipedia page suggests Dragonfly will be the first mission to the outer planets that will not use a gravity assist from Jupiter. Is there a source confirming ...
Anton Hengst's user avatar
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