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1 vote
0 answers
20 views

Orange lines coming from rocket engine nozzle?

This image of a test-fire of the RS-88 ethanol/LOX engine. It is apparent that there are these orange lines extending from inside the nozzle into the plume. What is it, and why is this phenomenon ...
0 votes
0 answers
17 views

Orbital Angular Momentum on STK

I want to allign my satellite with the orbital angular momentum vector. Thus, I've computed this vector in a Fixed Coordinate System using the cross product (r x v) between position vector and ...
  • 171
1 vote
1 answer
157 views

Questions about Orbital Propagation

I am a beginner in the field of aerospace. Recently, I wanted to use the extended Kalman filter to improve the orbit. My idea is to use TLE data as observations values, the ...
3 votes
1 answer
266 views

Images of the DART impact on Asteroid Dimorphos other then DART images

I am looking for DART impact images from others source. Images which came from some telescopes etc. Where I can find it? Sorry for My English.
3 votes
0 answers
37 views

Dilution of precision in different coordinates

Given the ranges $\rho^{(s)}_{R_x}=\sqrt{(x_{R_x}-X^{(s)})^2+(y_{R_x}-Y^{(s)})^2+(z_{R_x}-Z^{(s)})^2}$ between a receiver $R_x$ and an $s$-th satellite, where $s=1, 2, ... n$, one can construct the ...
9 votes
1 answer
63 views

Could Bepi-Colombo image the Messenger impact site?

Is the location of the impact site of Messenger known with sufficient detail to image it from low orbit? Does Bepi-Colombo have a high enough camera resolution to image Mercury at whatever the ...
  • 660
2 votes
1 answer
50 views

How to find cost data for commercially available spacecraft components?

I'm trying to research how much it should cost to build a small spacecraft, but it's super hard to find good information on the cost of various components. Can anyone suggest any good resources? For ...
4 votes
1 answer
142 views

Draper Semianalytical Satellite Theory (DSST) C/C++ version

Anyone knows where one could find the Draper Semianalytical Satellite Theory (DSST) semi-analytical propagator code in C/C++? I know Orekit includes the Java version inside its code. An in general if ...
3 votes
0 answers
44 views
+50

Which were the more than 60 (!) candidate locations for the Mars 2020 rover?

Four years ago I asked for the 21 potential landing sites for the Mars 2020 mission in this question, but now I've learned that there were more than 60 candidate locations ! From NASA Announces ...
  • 7,355
2 votes
0 answers
110 views

What would have happened if DART failed to hit Didymoon?

So I remember reading that there was a 10% chance DART will not hit Didymoon. It was on the German Wikipedia, but without a source. Now, I'm wondering if there would have been any plans if DART failed ...
  • 1,016
1 vote
1 answer
84 views

Satellite position using 2 station ranging

Two Station Ranging Given the position of 2 stations and the distance between both and the satellite (in km, say) and the fact that the orbit is geostationary and positioned at 45.1(degrees) west, ...
  • 11
1 vote
0 answers
42 views

What will be more important for the first NASA led human mission to Mars, the exploration of important science targets or the mining of water ice?

A few months after NASA's decision in November 2018 that Jezero Crater would be the landing site for the Mars 2020 rover mission, the research article The Geology and Astrobiology of McLaughlin Crater,...
  • 7,355
0 votes
0 answers
40 views

Pre burner design for cryogenic propellants [closed]

I have to design a preburner to change the phase of my propellants from liquid to gas and they are stored as cryogenics. I have tried to find resources on preburners but none of them specify how to ...
1 vote
0 answers
73 views

What are better ways to deliver heat directly to propellant in a Thermal Rocket design for use in launch than UV such as in the Nuclear Lightbulb?

Most advanced, high-power engine concepts that I came across aren’t suited for atmospheric launch, so I got curious about what kinds of engines could launch a very heavy craft from the surface of a ...
2 votes
0 answers
36 views

Would planetary quarantine have to be used for asteroid mining missions?

Currently, sample return missions have to follow very delicate procedures to move the sample to the return vehicle. This is incredibly complicated and may explain why so few missions have launched. ...
5 votes
1 answer
118 views

Have there been any rockets whose payload fairings consisted of more than two parts?

Most cargo rockets, such as Falcon 9, Delta IV, and many others, incorporate payload fairings to protect payloads from aero forces and heating during ascent. All of these rockets' fairings split in ...
8 votes
0 answers
97 views

Dimorphos natural orbit variability vs DART impact

As we know, DART spacecraft have impacted Dimorphos, a satellite of Didymos. The impact will change the orbital period. Depending on the properties of Dimorphos (mass, porosity, cohesion), the period ...
  • 8,636
0 votes
0 answers
39 views

A hybrid micropropulsion system for CubeSats

I am curious about how much potential would a hybrid (electric & chemical) micropropulsion system have for CubeSats. The chosen propellant is water due to its non toxic nature, cheap cost and high ...
  • 101
2 votes
0 answers
86 views

How do different stages attach to each other?

I started learning about rockets recently, and while searching for information, I found some ways that different stages separate, but I wandered if it was possible that they could reattach to a ...
  • 21
2 votes
2 answers
72 views

How to calculate the ECEF coordinates of a satellite given its elevation and azimuth angle, plus the coordinates of a reference object on Earth

So I am looking for a way to 'reverse engineer' satellite ECEF coordinates given its angles of elevation and azimuth and given the coordinates of an object on Earth serving as a reference ground. The ...
0 votes
1 answer
36 views

How to convert TLE data into state vectors in ITRF?

As shown in the question, Now I have a TLE observation data and CPF(Consolidated Prediction Format) data. According to CPF's documentation, CPF predictions are tabulated satellite state vectors ...
4 votes
0 answers
168 views

Was DART meant to impact dead center?

According to eyes on the solar system, Dimorphos is tidally locked to Didymos. If DART impact direction is perfectly aligned with Dimorphos center of mass, all of the momentum transfers into orbital ...
  • 3,787
2 votes
1 answer
89 views

If the pseudorange is not fixed, how does a receiver lock/fix onto a satellite signal?

If the satellite moves around the orbit at a velocity, the pseudorange between the receiver and the satellite should be changing right? If so, how does a receiver lock onto a satellite signal if the ...
5 votes
2 answers
1k views

Developing intuition about altitude and velocity in multi stage rockets

I just started learning some basics of rocketry and am struggling to understand the outcomes of a simulator I’m programming. All other things being equal, when I attempt to simulate the altitude over ...
13 votes
2 answers
2k views

What caused the jitter in the DART video as it approached Dimorphos?

If you look at the series of images DART took as it approached Dimorphos, the asteroid jumps around a bit as you approach. Does this mean small corrections were being made right up till near the end? ...
  • 7,444
8 votes
1 answer
689 views

On the LM, what is the difference between ABORT and ABORT STAGE?

The LM had both ABORT and ABORT STAGE buttons. What was the difference and in which scenario would each be used?
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2 votes
0 answers
106 views

What is the optimal acceleration for a direct ascent to the moon? [duplicate]

If a rocket flies to any object using a direct ascent it is best for it to reach the needed speed as soon as possible because of the Hohmann effect. When it launches from the ground there is air ...
1 vote
2 answers
134 views

Is the Artemis Missions direct ascent?

I’ve been looking at “exploded” SLS rockets, where the stages are all shown, and there never seems to be a lunar lander. Does that mean that the Orion Spacecraft lands on the moon, or will it have a ...
23 votes
2 answers
4k views

When Artemis runs out of rollbacks

On 2022 Sep 26, Artemis I was moved from its launchpad back to its "garage" to shelter from a hurricane. It was reported that NASA managers have said the system is rated for two more ...
1 vote
3 answers
77 views

Propellant Density Calculation for LOX/Kero

I am trying to make sense of the equation for propellant density calculation, rho=(rw-1)/(rw/bo+1/bf). Sutton, 7th edition, gives this equation (7-2) as: $ \ \ \ \rho_{av} = \frac {\rho_o\rho_f(1+r)} {...
  • 11
3 votes
2 answers
85 views

what is 'f' (true anomaly) for in the orbital inclination change equation

I've been trying to make sense of the formula for an orbital inclination change for an elliptic orbit. This is for an orbit that is not altered in any way apart from its inclination. The equation from ...
  • 6,215
-1 votes
1 answer
48 views

Retrieving TLE file when offline

How does one retrieve the TLE file without any internet access? For instance, I am out in the open sea without an internet connection for a few days. Can I still get the latest TLE file by some other ...
  • 9
0 votes
1 answer
366 views

Can DART/Dimorphos impact be seen with naked eye?

Can today's DART/Dimorphos impact be seen with naked eye?
6 votes
1 answer
163 views
+50

How to protect Mars/Moon mission crews against meteors?

Humans are expected to return to the Moon (see Artemis) and maybe go to Mars (see this and this) within a decade or two. Meteors frequently strike the surface of both the Moon and Mars (one can't ...
0 votes
1 answer
138 views

How to transport C and N₂ from Mars to the Moon?

While the Moon can offer many raw materials for the manufacturing of a wide range of technological components, it lacks abundant sources of carbon (required for steel) and nitrogen (useful for ...
9 votes
2 answers
2k views

How can we source potassium fluoride outside of Earth?

Potassium fluoride is the best known terrestrial option to purify the various materials used for the manufacturing of photovoltaic panels. Many of these materials can be found in regolith. The process ...
9 votes
1 answer
527 views

What is the area of the SSME nozzle knowing only thrust at sea level and in vacuum?

Looking at the SSME Wikipedia RS-25 Space Shuttle Engines, the data shown that the thrust at sea level ($F_{sl}$) is 1.816*10$^6$ N, while the thrust in vacuum ($F_{vac}$) is 2.278*10$^6$ N. Knowing ...
0 votes
1 answer
260 views

Would Artemis 1 have blown up on the pad if NASA had been unaware of (or ignored) the errors that resulted in the launches being aborted? [closed]

Artemis 1 has had several unsuccessful tests. We've seen reports of "hydrogen leaks", "engine failures", "sensor malfunctions", "stuck valves", "fueling ...
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1 vote
1 answer
73 views

do launch vehicles fly at negative angle of attacks after pitch over maneuver?

At early seconds of flight, launch vehicle goes up vertically. at the beginning of pitch over, it has vertical velocity and simultaneously pitching which makes the wind to flow from upward direction. ...
2 votes
0 answers
102 views

Is it possible for fuselages to have a negative lift coefficient at positive angle of attacks?

Recently I was interested in the descent phase of the first stage of the falcon 9 launch vehicle. I assumed a long cylinder to represent the first stage. using DATCOM to predict aerodynamics ...
2 votes
2 answers
152 views

best way to generate electricity on any planet's dark side

What options are available for generating electricity in a space colony if it is at the planet's darkest point all year around without help from nearby outposts?
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-4 votes
1 answer
77 views

How many collisions are possible to eradicate all already existing satellites? [closed]

If earth lost all contact with satellites, how many collisions would it take to be left with 0 satellites orbiting in their normal path? Deep-space objects are not considered like James Web Telescope.
  • 121
1 vote
0 answers
30 views

How redshifted galaxies will JWST be able to detect? [closed]

I see that the MIRI camera/spectrograph on JWST has an operational wavelength span between 5 and 28 micrometers. Now visible not redshifted light has wavelengths between 400 and 700 nanometers. If ...
  • 221
2 votes
1 answer
59 views

Discrepancies in thrust chamber dimensions for RL10

I've recently been developing some automated scripts in Python for the purpose of calculating engine parameters. I've been using the RocketCEA interface library, which links to NASA's Chemical ...
  • 527
-3 votes
1 answer
105 views

Will NASA abandon the Voyager spacecraft?

according to sindibad (a website) the voyager space mission is coming to an end. How long until this happens. according to the website, NASA wants to end the mission while the probes are still ...
0 votes
0 answers
36 views

Can the JWST look at Earth? What would it see? [duplicate]

There's a few questions on the site about whether we can see the James Webb Space Telescope from Earth (i.e. here and here), but I'm wondering about the opposite - can we see Earth using the JWST? I ...
  • 101
1 vote
1 answer
116 views

What is that cone-shaped thingy on most orbiters?

Whether you're Looking at MRO, Odyssey, Juno, or MAVEN, you might notice it. That odd cone on the top or bottom of the spacecraft. Does anyone know what it is?
1 vote
0 answers
43 views

Actuator bandwidth [closed]

What is the relationship between the slew rate of the linear actuator and bandwidth? What should be the slew rate if I want 5 Hz actuator bandwidth? For more details:- I'm using a 2nd transfer ...
  • 11
0 votes
1 answer
57 views

How long would it take to send a probe to the Oort Cloud [duplicate]

If we used the best current technologies that people are willing to use. How long would a mission to the Oort Cloud take? Let's assume that we want the probe to be able to send us back data once there....
0 votes
1 answer
89 views

How long would it take Starship to get to Neptune without any flybys?

After seeing this answer (https://space.stackexchange.com/a/60438/44505) saying that starship could get to Neptune, I wondered how long it would take to get to Neptune. Bonus question: Would it be ...

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