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Questions tagged [interplanetary]

Questions regarding spacecraft designed to travel between planets.

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Liquid shield for spacecraft? [on hold]

Initially this question was going to be on how to improve the Parker Solar Probe shield. While time passed I saw other possibilities for using this method for active shielding. Could a shield heated ...
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2answers
294 views

How might the experience of a trip to Mars differ in comfort and heath impact from a stint on the ISS?

A comment below the question How will they mitigate the effect microgravity in the BFR on manned trip to mars? suggests that the trip might be as short as 3 months, which is significantly shorter than ...
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2k views

Travel Speed in Space

I have read several questions and answers here concerning achieving speeds beyond the typical deep-space exploration missions. While speed increases near the Sun for example, that can't be applied to ...
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327 views

How does the speed and volume of particles differ in producing thrust in space?

Does a slower detonation velocity push a ship more the same way explosives with a slower detonation velocity moves dirt better? At the same rate does slower particles produce more thrust from a ...
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2answers
213 views

Is it viable to use one or more BFR tankers as interplanetary boosters

Is it viable to Start the BFR mars burn while the ship is attached to one or more refueling boosters? (Imagine interplanetary booster) Using their combined engines the ship can achieve greater ...
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2answers
406 views

Is this description of the “dipole drive” and how it would work physically correct?

Comments in chat have noted the recent post in the Centauri Dreams blog titled The Dipole Drive: A New Concept for Space Propulsion. In contrast to the single positively charged screen employed by ...
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0answers
114 views

Could inflating while decending for rentry be possible?

Could entry of Mars with balloons work by inflating to equalize with the atmopheric air pressure while establishing buoyancy before meeting the ground? Would a balloon pop if dropped from space? ...
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1answer
101 views

Does a one way mission to Mars make more economic and scientific sense than a two way mission?

A one way mission skips any return rocket needs, extends the research mission by decades and slowly builds up the infrastructure on the surface. The longer mission on Mars would require regular ...
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3k views

What bitrates are currently achievable for communication with interplanetary space probes?

In communication with interplanetary space probes, it is clear that one has to take the delay caused by speed of light into account. Besides that, what are current limits for the data upload and ...
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1answer
71 views

How does Accion System's TILE propulsion module compare to an equivalently sized Hall effect or an Ion thruster?

Accion systems claims that it's TILE propulsion module can be scaled up to match the performance of a Hall effect or Ion thruster minus the clunky tanks and propulsion management systems. This would ...
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2answers
146 views

Ion thrusters trip time

Suppose we had a fully equipped nuclear powered ion thruster starship. If it had a constant rate of acceleration of 1g, taking into account the fact that at the half way point you would have to turn ...
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Assuming a spacecraft is traveling in a constant rate and our Astronaut will exit it to a space walk, will he be “left behind” by the spacecraft?

Lets say our Spacecraft is traveling to a remote Galaxy at a constant speed of 1/X of the speed of light. A brave Astronaut is leaving the spacecraft to a space walk, while not being attached to the ...
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1k views

How do we make a round-trip journey to Mars?

I've been to Kennedy Space Center in Florida, where I saw the huge Saturn V rocket... This was used to get to people to the moon. It had a Lunar Module to propel itself on and off the moon's surface ...
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1answer
46 views

Orbit ephemeris or visualization for the BepiColombo mission?

Where is it possible to see the progress of the BepiColombo mission in terms of ephemeris and or graphical visualisation? I should add, I've checked JPL Horizons, though its not clear how to specify ...
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1answer
202 views

Is Hohmann transfer the most frequent transfer orbit?

I have to complete a project for a university exam. The task is to design an interplanetary trajectory from Earth to Saturn, and to compare it with a Hohmann transfer to the same planet. I also have ...
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4answers
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Why don't we launch spacecraft from the Moon?

The Moon has less gravity than the Earth and its own orbital speed around the Earth removes some of the velocity required to leave the Earth-Moon space, right? We could send probes or spacecraft much ...
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1answer
160 views

Which planet gets the most money? Which gets the least?

I'm curious if anyone has ever tallied the expenditures of all of the world's space programs, and then tried to divide it by which planet was targeted. It's possible this has already been done. If ...
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1answer
180 views

Would a Martian landing and take off require a flame trench/deflector?

Flame trenches/deflectors are essential for avoiding reflections of acoustic waves from damaging the rocket system while taking off. This is discussed in this YouTube video - Why doesn't the sound of ...
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1answer
144 views

How precise are spacecraft trajectory measurements?

Interplanetary mission trajectories are frequently likened in popular media to hitting a small target with a dart from vast distances, but in reality, spacecraft don't need absurdly high precision, ...
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0answers
46 views

What is the importance of thrust control history in low-thrust optimization?

As I have mentioned before, I am trying to optimize an Earth - Mars low-thrust transfer using a particular method. It has been mentioned to me, and I have seen it in many papers, that thrust history ...
2
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1answer
72 views

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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3answers
364 views

How does the Parker Solar Probe have such a wide launch window?

The Parker Solar Probe is set to launch on August 11th 2018. It will perform 7 orbit-lowering gravity assists around Venus for ~6 years before reaching its final operational orbit. It has been well ...
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1answer
111 views

How much asteroid can we divert from the Earth?

There are many movies with the Earth being saved by sending a bomb out blow up the asteroid. What realistically could we do to that degree today? Do we have interplanetary missiles? if so how much of ...
3
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1answer
84 views

Full Mission Analysis elements?

I am trying to complete a full trajectory design and analysis for a low thrust interplanetary mission to Mars. Right now, computing optimal trajectories from Earth to Mars for a number of dates and ...
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4answers
13k views

Is Nibiru real or totally science fiction?

I have seen lots of YouTube video stating about Nibiru. They say, that Nibiru is approaching earth. Few of the video claims that space maps (Google's) hide this Nibiru with a black patch. A few years ...
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2answers
178 views

Floating Launch

Can a space rocket launch if it had no platform underneath it? If a blimp could lift a rocket into the stratosphere to launch, What problems would arise and how big would it be? What prevents a blimp/...
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1answer
109 views

How to get Ltool by Martin et.al?

I am just starting work on dynamics of CRTBP. Over several papers I see that "Ltool" is used for trajectory design, But I am unable to find over internet. Can somebody help me to identfy how to ...
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7answers
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What is the rarest launch window?

What situation would make a launch window rare? What is the rarest known launch window?
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1answer
243 views

Tracking Arc and Time for Precise Orbit Determination

It is said that for Precise Orbit Determination (POD) of interplanetary spacecrafts, generally, during the cruise phase for aiding accurate TCM (Trajectory Correction Maneuvers) planning, long arc of ...
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5answers
781 views

Could the ISS be propelled to Mars?

As the ISS has shown the ability for human habitation for extended periods, might we be able to add a propulsion unit to the ISS that would be capable of providing delta-v to send ISS to a martian ...
4
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1answer
196 views

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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1answer
131 views

Laser communication for interplanetary probes - aiming is impossible without beacon?

Laser communications are considered very promising for interplanetary probes because of potentially much higher data rates. I found that laser communication at large distances (over 3 a.u. ~ 450 ...
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0answers
133 views

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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2answers
379 views

Solar Flux on Mars Surface

Considering that the Solar Flux on top of Mars' atmosphere is 590 W/m2 (following the 1/r^2 relation for sunlight), how much of this incident light actually arrives to Mars. In other words, what is ...
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1answer
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320 views

Generating plot of LV's performance as a function of the C3 parameter

Following my previous question about Ariane 5 performance data for escape missions, I would like to know how the plot of launch vehicle capabilities like the next one are obtained: More specifically, ...
3
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2answers
266 views

How do I calculate wait time to launch?

I want to transfer between two planets using Hohmann transfers and the patched conic approach. However, I am struggling to figure out how long I have to wait at the starting planet (say Uranus) until ...
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2answers
1k views

What aspects of reentry heating 'scale as the 8th power'?

Elon Musk just commented in the post Falcon Heavy Test Flight press conference that reentering at interplanetary velocities means dealing with 'some of the heating things that scale to the 8th power'. ...
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2answers
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What's the marginal cost of a second interplanetary space probe copy, like Voyager 2 or Viking 2?

During the old space race days, launching double or multiple scientific probe copies seems to have been the standard. It should have the advantage of sharing the one time fixed development costs while ...
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1answer
28k views

Current position of Starman

Have looked at current videos of Starman and not found data as to it's current position. Is there a site plotting the current position of Starman?
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1answer
188 views

How do I calculate the delta-v with patched conics?

I am trying to calculate the delta-v between Kerbin and Duna from a 70 km circular orbit around Kerbin just to do a flyby of Duna. However, I am running into a couple of difficulties with my ...
6
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1answer
434 views

What plans does AEB (the Brazilian Space Agency) have for missions beyond GEO?

Besides the US, we focus a lot on Russia and China's space programs. India also gets a little attention. Brazil, Russia, India, and China form the BRIC group which is widely presumed to surpass G7 ...
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4answers
2k views

Has an interplanetary date/time system been established yet?

Obviously, with no humans living permanently off-planet yet, Earth-style dates and times are the most common system is use, and reasonably so. And it helps that Mars's day is almost the same length ...
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1answer
109 views

Could BNNTs be used for Whipple Shield designs?

BNNTs are a upcoming and promising nano-tube for space exploration. Featuring a young's modulus similar to diamond [1] and offering extensive radiation protection [2], Could BNNTs be utilized in a ...
2
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1answer
526 views

How much fuel is needed for the motor landing and taking off on mars?

For example, the Apollo lunar module landing on the moon was worth approximately 60% fuel of the total weight (on wiki 8 tons of the 15 tons). Departure from the surface was about 50% of fuel (2.5 ...
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2answers
261 views

Calculating hyperbolic orbit elements for interplanetary intercepts

As part of a final year project at university I'm currently trying to simulate an interplanetary transfer between Earth and Mars for a manned mission. The ultimate aim is to use NASA's GMAT to ...
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1answer
149 views

Could e-sails provide safer space travel

E-sails (Electric Sails) deflect Solar wind protons to produce thrust, that's good protection for living things in a permanent centre module that produces and stores food and oxygen. I was thinking a ...
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1answer
122 views

From which direction should a spacecraft intercept a target planet's sphere of influence for an inner-to-outer planet trajectory?

Suppose a spacecraft is on an interplanetary Hohmann transfer trajectory from an inner planet to an outer planet. When the spacecraft finally enters the target planet's sphere of influence, which ...
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1answer
266 views

Low Time-of-Flight Lambert Solver Trajectory Errors

I have a Lambert solver that is used to calculate the required delta-V for interplanetary transfer trajectories, but I recently ran into a problem. It works well for "long" time-of-flight trajectories ...
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2answers
181 views

What is the characteristic time to reach a hyperbolic excess velocity within a sphere of influence?

When departing a planet using a hyperbolic trajectory, one should ideally reach the sphere of influence boundary with an excess velocity needed for interplanetary transfer. Of course, the true excess ...