Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [gravity-assist]

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

1
vote
1answer
99 views

Mangalyaan + Trident; is it possible? escape the solar system using a low cost booster

5 years ago, India launched the Mangalyaan spacecraft to Mars, on a budget that raised eyebrows at the time. It was probably the Mars mission launched with the least powerful rocket; a feat only made ...
0
votes
1answer
102 views

Will a spacecraft accelerate in a gravitational field via the use of a powered rotating mass?

I believe that a powered rotating mass on board a spacecraft should result in the spacecraft being propelled in a continuous increasing velocity towards the source of the gravitational field. To help ...
1
vote
0answers
22 views

What Jovian system science targets would be suitable for Jupiter gravity assist flyby missions with other primary purposes?

Flying by Jupiter for gravity assist, and with the Oberth effect bonus, has been used for multiple missions to other outer planets and to comets. And has potential for use even for missions aiming at ...
8
votes
2answers
2k views

What is the smallest body in which a sling shot maneuver can be performed?

This question asks about the smallest sling shot maneuver performed. What was the smallest intentional, acknowledged slingshot maneuver? I'm asking how small of an object be to perform a sling shot ...
2
votes
0answers
289 views

What was the smallest intentional, acknowledged slingshot maneuver?

I'll keep it short but please read through! Gravitation's $1/r$ potential means everything in the solar system is pulling on everything all the time. Gravitational slingshot maneuvers are normally ...
2
votes
3answers
229 views

How fast can an orbit exist in the solar system?

How fast is too fast to stay in orbit around any particular large body in the solar system?
16
votes
8answers
9k views

Why didn't Voyager 1 and Voyager 2 crash on into Jupiter or Uranus when they approached near to these massive planets?

I was reading about gravity assist and I read that both the Voyagers used gravitational force of these planets to speed up. But I wanted to know why weren't they completely attracted by their ...
3
votes
2answers
438 views

How much does a swing-by change the orbit of the planet?

A friend of mine told me that one Voyager swing-by moved the orbit of Jupiter a foot closer to the sun. I understand that Jupiter was slowed by the gravity assist, but I figured it would be minuscule ...
2
votes
0answers
119 views

Determining the spacecraft position vector with respect to ICRF frame for Venus flyby

For an interplanetary mission design to Saturn, I have considered doing multiple gravity assists starting with Venus. I am using the JPL Horizons ephemeris and ESA Lambert Solver. I have the ...
0
votes
1answer
75 views

Perpetual motion [closed]

When I was young, I had a set of bar magnets which had poles on the side faces (across the thickness) and not at the two ends. I placed one on the table facing one pole upwards (say north pole). ...
6
votes
1answer
167 views

Help choosing a gravity assist scenario for this problem

The problem stated below is from an assignment I was given. My initial approach involved doing a direct Hohmann Transfer to Saturn. This approach violated the fuel constraints and hence was deemed ...
32
votes
5answers
9k views

The dreaded apocalyptic asteroid approaches Earth but lands safely on the Moon at zero relative velocity

An asteroid approaches and the Moon 'catches' it in the same way that a sports player catches a ball - that is to say by matching the velocity of the hand to that of the ball. Could a lucky slingshot ...
2
votes
0answers
71 views

Venus gravity assist (and aerobraking) - How much delta-V can it add?

The Voyagers made a grand tour using the gravity assist of each planet. But Jupiter, with a 12 year orbital period, doesn't always line up to be useful for spacecrafts destined to further planets. ...
1
vote
0answers
89 views

Multiple gravity assists [closed]

Is it possible,just by looking at the heliocentric position and velocity vectors of the spacecraft and the planet,to decide whether the resulting flyby would be trailing or a leading flyby? If yes, ...
4
votes
2answers
135 views

Gravity assist braking from Titania

If a probe entered a highly elliptical orbit around Uranus after firing its engine (similar to what Cassini did at Saturn), could it use Uranus' moon Titania as a gravity assist to circularize its ...
1
vote
0answers
89 views

If Cassini's final flyby of Saturn's moon Titan is the 127th Titan flyby, why is it called “T-126”?

Cassini's final flyby of Titan in April 2017 sealed it's fate in September of that year. This is described further in answers to What force is bringing Cassini down into Saturn's atmosphere in another ...
1
vote
3answers
476 views

Can a satellite utilize gravity gradient stabilization, solar power, electrodynamic tethering and dynamic quadrupole momentum at once?

Have any analysis been done using 2 or more devises above to function as a satellite where 1 alone would not to maintain orbit without propellants? Will this system or one with a different ...
2
votes
1answer
202 views

Was the gravity turn used in early spaceflight?

Reading through the Wikipedia article about Gravity Turn, specifically the Use in spaceflight section, it seems that the Gravity Turn was not used in early spaceflight. Is that correct? For example, ...
3
votes
1answer
107 views

What would the perihelion of Ulysses's orbit have been without a trajectory adjustment after its Jupiter swingby?

I'm wondering what the perihelion of the orbit of Ulysses spacecraft would have been had a trajectory adjustment after its Jupiter swingby not taken place? On Wikipedia it says "The size and shape of ...
1
vote
2answers
60 views

Can the Sun's magnetic field be used to propel a solar satellite?

Can diamagnetic materials or a diamagnetic devise be used to propel using the magnetic field of the Sun in a solar polar magnetic assisted slingshot?
0
votes
2answers
828 views

Can you use magnets to travel through space?

My thought process is that there is very little friction in space minus gravitational pull. Which could be a good thing if you wanted to go faster or slow down. The question is, is it possible to ...
6
votes
1answer
117 views

How can I look for the best date of launch for gravity assist?

I am new to astrodynamics, and I am trying to learn about gravity assists, but I don't understand how I can easily decide a launch date and arrival late for the planet in which I calculate the gravity ...
2
votes
0answers
171 views

Is it possible to dock with a ship that is on a Galileo-like trajectory?

Reading about missions that have made or will make heavy use of gravity assist (Galileo, Cassini, MESSENGER, BepiColombo...) made me wonder about what if a heavy unmanned ship (BFS?), with all the ...
2
votes
2answers
235 views

Calculating spacecraft thrust manoeuvres with JPL data

I've recently programmed an animated simulation of the main elements (core planets and Sun) of our solar system: by using the initial coordinates from the JPL (Jet Propulsion Laboratory - NASA) ...
8
votes
2answers
368 views

Could Starman get ejected from the Solar System?

This is not about a prediction of Starman's fate, although it might be interesting to find it so. This is about any object having similar aphelion and perihelion values to Starman (Elon Musk's Tesla ...
18
votes
4answers
3k views

Can we set up an orbiting transporter between Earth and the Moon?

I will give an example with the moon. If some spacecraft is put either in orbit around both earth and moon or in highly eccentric orbit that intersects with the moon orbit, some other spacecraft can ...
6
votes
1answer
649 views

Can we speed up spacecraft to suitable interstellar travel speed using oscillating gravity assists on planets on opposite sides of the solar system?

I recently calculated using $E = 0.5mv^2$ that one kilogram of mass traveling at one tenth of the speed of light would have a kinetic energy of 449.4 trillion joules. Relativistic effects are ...
4
votes
2answers
392 views

Estimate of effectiveness of gravity turn compared to vertical flight

How much higher is a rocket following a gravity turn going to be able to reach compared to a rocket following a vertical flight ? I understand that it depends on which type of rocket and which type ...
15
votes
2answers
2k views

How much longer would New Horizons take to reach Pluto without the Jupiter slingshot?

A recent answer by PearsonArtPhoto claims: New Horizons was launched at Solar System Escape Velocity, meaning it could have visited anywhere beyond Earth without stopping. It did visit Jupiter, ...
1
vote
2answers
3k views

Would it be possible to go beyond Jupiter without making any slingshot?

It is said that we do not have such advanced technology in order to send a spacecraft out of the solar system. (Source: Everyone around) When a spacecraft is launched from Earth and aims to leave the ...
5
votes
2answers
543 views

How do we come up with the gravity assist (or slingshot) formula?

When you search up in google gravity assist formula, it comes up with the simplest version: Which means that: Final velocity = Initial velocity + 2 (velocity of the planet) Then if we do some more ...
2
votes
1answer
145 views

Does a Titan flyby guarantee that a spacecraft can escape Saturn?

Could a spacecraft orbiting Saturn, like Cassini, use a Titan gravity assist to leave the Saturn system (e.g. to bring a sample back to Earth), without using fuel other than to reach Titan?
16
votes
1answer
596 views

When are there launch windows to Neptune via Jupiter?

I suppose there's a launch window to Neptune by using Jupiter as often as there are Jupiter/Neptune conjunctions, every 13½ years. But which years are Jupiter and Neptune best aligned for gravity ...
1
vote
4answers
255 views

How to gain speed in space?

New concept: What about if we are to depend from external forces? So we cannot produce any kind of propulsion from our ship. Previous question: I know that there are two main ways to gain speed in ...
6
votes
1answer
1k views

Could we use the moon for a slingshot effect?

The slingshot effect or gravity assist maneuver produces a boost on the speed of the object which attempts to approach a planet head-on at a speed V while the planet is moving directly toward us at a ...
3
votes
0answers
121 views

Isn't the escape velocity for the solar system at the Earth 42.1 km/s? Then why does the graph show 36 km/s for the same value? Is the plot wrong? [duplicate]

The graph shows that 36 km/s is the escape velocity of the solar system at the Earth. But if we do some calculations, we will get 42.1 km/s as the right answer. I have been checking all other escape ...
6
votes
2answers
674 views

What are the disadvantages of gravity flyby assist?

Does the gravity assist get affected by any of the forces by other planets as they proceed towards the required orbit? Moreover what can be the other setbacks of gravity assist flyby?
1
vote
0answers
81 views

Is gravity assist provided by black hole as shown in Interstellar possible? [duplicate]

In our space missions, we use gravity assists by planets to change the speed relative to the sun. The speed relative to planets remains the same. We cannot use the sun for gravity assists. In ...
1
vote
0answers
183 views

Is there a way to get the angle of approach of a spacecraft with respect to a planet velocity vector?

I apologize if my question is badly formulated I know it's really specific but here what I would like to know : I managed to compute the turning angle of the velocity for a body along a hyperbola ...
3
votes
1answer
241 views

Is it profitable to save fuel for the Oberth effect during a Jupiter gravity assist?

Probes to the outer Solar system use a Jupiter flyby for gravity assist, all six such missions thus far have. While flying near a gravity well one can enjoy the Oberth effect which multiplies the ...
2
votes
1answer
226 views

How close to Jupiter does a spacecraft need to get in order to gain maximum gravity assist and Oberth effect bonus for leaving the Solar System?

Given that a spacecraft's purpose is to leave the Solar System as fast as possible, how deep into Jupiter's gravity well would be optimal for an assist in the planet's orbital direction? Jupiter's max ...
4
votes
2answers
710 views

Can we significantly reduce entry velocity with this method by airbraking alone for interplanetary travel?

For example, can a space ship overshoot Mars in a reverse gravitational slingshot mixed with a little air breaking, steering to keep the spacecraft from orbit and then land on Mars with a near 0 ...
4
votes
1answer
240 views

How accurate can near earth asteroids be tracked?

To get more statistical significance for the suspected flyby-anomaly (or to refute it), it would be desirable to track as many hyperbolic earth flybys to within 1mm/s as we can get. Can we track ...
2
votes
1answer
368 views

Is the fastest way to Mars a solar flyby?

The recent question Launch windows to Mars got me thinking. Why is there only one or two launch windows to Mars ever other year? If you leave Earth heading for the sun, you should get a gravity ...
0
votes
1answer
72 views

Why is Osiris-REx using an Earth flyby gravity assist?

Osiris rode on an Atlas V 411. Why not use a larger rocket and skip the gravity assist flyby?
3
votes
2answers
232 views

Gravitational assists from bodies other than planets

Gravity assists are pretty important for interplanetary travel. NASA uses them mainly because they can save time, energy, propellant, and expenses. But so far, all of the gravity slingshots have used ...
1
vote
2answers
239 views

Why use the term “gravitational slingshot”?

I was reading about gravity assist. This maneuver is sometimes called a gravitational slingshot. But to me it seems more like a sling (like the one the Biblical David used against Goliath) The ...
1
vote
0answers
57 views

How slingshot is used to increase the speed of Juno [duplicate]

I have gone through the slingshot for the Juno with the earth. I have also seen the train and ball example as given by NASA. [http://solarsystem.nasa.gov/basics/grav/primer.php] But, I am still ...
7
votes
1answer
486 views

Is it possible to leave the Solar System by repeatedly using gravity assists from the Earth?

If a spacecraft was accelerated to just above Earth's escape velocity, it would begin orbiting the sun with an orbit very similar to Earth's. Could the spacecraft then repeatedly perform a gravity ...
2
votes
1answer
119 views

Could momentum transfer be practical (e.g., for orbital insertion at Pluto)?

Constraining exploration of outer bodies to flybys (such as New Horizons) seems unfortunate in terms of the amount of science that can be done per mission. Using a slower planetary approach has ...