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Questions tagged [planning]

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136 views

What are the limiting factors for interplanetary mission trajectories?

Besides the hard limit of available Delta V, and the soft limit of the time to destination, what are the main constraints when planning an interplanetary mission? I'm thinking things like maximum ...
2
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1answer
38 views

How well the orbits of Jupiter Trojans to be visited by Lucy may be predicted?

The orbits of the large planets are very well known and their position may be precisely predicted for the planning of complex swing by maneuvers of interplanetary space probes. There are exact ...
1
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1answer
129 views

How fast are trips to the Moon for unmanned spacecraft typically?

The period of an orbit around the Earth is given by: $$T = 2 \pi \sqrt{a^3/GM}$$ For Earth GM is about 3.986E+14 m^3/s^2. Put in $a$ = ((6378+400)*1000) for the ISS in LEO (as a test) and you get ...
5
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1answer
112 views

Why does ExoMars have more landing ellipse flexibility in 2020 than in 2018?

The BBC's ExoMars: Where to send Europe's robot rover? discusses the decision-making faced by the ExoMars Site Selection Working Group. The working group will spend Thursday and Friday discussing ...
3
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2answers
255 views

Where is Lucy going? (asteroid mission)

On Halloween (31-Oct-2018) NASA Goddard announced that Lucy has a green light: NASA’s Mission to Jupiter’s Trojans Given the Green Light for Development All I have are these links which are now ...
3
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2answers
146 views

How would a Jupiter flyby have helped to get to the Sun? Why was it later ruled out?

The quote below surprised me. What were the orbital mechanical details of using a Jupiter flyby to get a probe from Earth so close to the Sun? Was a "U-turn" possible; single flyby of Jupiter into a ...
3
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1answer
53 views

Where can I find detailed information on spacewalks?

I am looking for detailed (as detailed as possible) information on the various space walks carried out on ISS. If I can get minute-by-minute steps taken, which bolts were turned, which wires were ...
6
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1answer
247 views

Decision making for NASA missions

A few years ago I read about a decision methodology that NASA uses to reduce the number of options/variables for future missions. Essentially, they make decisions that will remove the largest number ...
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0answers
143 views

Databases of “scrubbed” launch attempts?

I'm curious if there is a statistically demonstrable tendency not to schedule launches on certain days, such as those that contain leap seconds (see answers below this question), year changes, or ...
7
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2answers
716 views

How (the heck) can 2014 MU69's orbit be know well enough for a close flyby by New Horizons?

The object 2014 MU69 is much smaller and dimmer than Pluto. Even as New Horizons approaches, it will be much harder for its 8.2 inch aperture, cooled CCD long range imager LORRI to get a fix on it ...
6
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1answer
855 views

Any potential downside to throwing personal life support out the door on the Moon?

I found this really interesting description of the ALSEP instrumentation placed on the moon during the Apollo 11 landing, written by Hamish Lindsay, (also, author of Tracking Apollo to the Moon). One ...
18
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1answer
2k views

In deep space missions, how much of the journey is pre-programmed and how much is “direct” control?

Regarding deep space missions, like the Rosetta mission, how much of the journey to the final destination is pre-programmed vs. recalculated on the fly? For the Rosetta example, was the whole sequence ...
4
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1answer
72 views

How fast can a launcher be retargeted?

Imagine that an asteroid is detected on an incoming trajectory, or some scientifically very interesting phenomenon occurs somewhere in the Solar System, prompting us to quickly send something there to ...
2
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1answer
129 views

Why is NASA redirecting an asteroid to Lunar Orbit instead of LEO? [duplicate]

One of the missions NASA is planning is to redirect a small asteroid to lunar orbit and land astronauts on it. If it can redirect asteroids, why not just send it to LEO and send a Dragon to it?
9
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2answers
3k views

What is the effect of gravity slingshots around Earth on Earth's rotation and orbit time, and is this effect worth considering?

Several space probes have used gravitational slingshots around Earth as part of their mission plan to get to other places in our solar system. Some examples I could find quickly are Galileo, Messenger ...
14
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2answers
1k views

How would finding life on Mars affect the timeline to send people?

There are a lot of questions here about looking for life on Mars, potentially finding life on Mars, how to deal with life on Mars as far as contamination one way or the other, even whether or not ...
10
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2answers
2k views

How are gravity assists conceived?

So there are some very complex gravity assists out there. The Cassini mission, for instance, used a VVEJ (Venus Venus Earth Jupiter) gravity assist to make it to Saturn. Similar flybys have been done ...
6
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1answer
335 views

How does delaying Soyuz TMA-15M crew return help with ISS schedule slip due to failed Progress M-27M resupply vehicle?

After the failed Progress M-27M / Progress 59 resupply mission in late April 2015, Roscosmos and NASA have been working on ISS schedule changes to accommodate loss of supplies to the station, while an ...
3
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5answers
522 views

Any “what if” plans for space programs?

I assume that all space programs, manned and unmanned, have many "what if" plans for situations that might happen. For example, on the ISS they had fire alarm and evacuated to the Russian side. Are ...
8
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2answers
1k views

Are there any planned extra-solar missions by NASA or others?

Voyager 1 and 2 have been gone for a LONG time now (decades) and presumably we can produce bigger, faster and better probes these days that could tell us a lot more about the heliosphere. I've not ...
7
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3answers
3k views

How is an orbital rendezvous planned?

I'm curious how people plan an orbital rendezvous. This question explains the basic principles, but not in enough detail for me to understand how it actually works. From playing Kerbal Space Program, ...
11
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1answer
331 views

How are space agencies coordinating their science missions internationally?

Is there any coordination between governmental space agencies in order to achieve complementary science goals with interplanetary and other space missions? If so, is this done somewhat informally ...
13
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2answers
962 views

If something “falls off” the L2 or L1 point, where will it go?

The L1 and L2 points are thought to be unstable "saddle" points, meaning that there is stability in two directions of movement, but not in the other. That raises an obvious question - when a ...
3
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1answer
354 views

Has any space agency studied a lunar outpost architecture inside of a cave?

Apparently a number of (what appear to be) cave entrances on the moon have been identified. There is a long list of technical advantages to setting up a base in a cave, as opposed to surface modules. ...
7
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1answer
660 views

How will the Mars One landing site be chosen?

How is Mars One planning on choosing a landing site? Will they be able to use NASA assets (Mars Reconnaissance Orbiter, etc) to assist with choosing a site, or will they have to make do with public ...
13
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3answers
1k views

Why are Europe’s Air & Space Academy and DLR urging ESA and CNES to reconsider the use of solid fuels for the proposed Ariane 6?

With Ariane 6 launch site selected, CNES (Centre National d’Etudes Spatiales, the French space agency) was aiming to freeze the design of the new rocket in May 24, 2013. A few days after and that same ...
23
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1answer
1k views

How are flight plans calculated?

When a project like Rosetta is being developed, how are flight plans calculated? Do planners simply input the desired target into a program or a flight computer which spits out the optimum flight path ...