Questions tagged [rotation]

Questions regarding an object or spacecraft rotating around an axis.

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Rates of change of Euler angles to angular velocity of a rotating coordinate system

I am trying to implement the conversion between TEME and GCRF frames following the same procedure as done in SPICE. After digging into CSPICE's code, this transformation is performed through the ...
Rafa's user avatar
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4 votes
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62 views

Where to get data for axis of rotation of solar system bodies?

Where can I get data for the axis of rotation of the (major) bodies of the solar system? For each solar system body, I want to get a unit vector of its axis of rotation (at a specified point in time). ...
angst's user avatar
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1 answer
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Rotation and orientation of James Webb's mirror from ground stations

There are definitely pre-determined plans in the agenda of the James Webb telescope to take images from the universe, but if there is a need for any reason (intentional or emergency) to change the ...
Merlin's user avatar
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3 votes
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New to GMAT. Where do I start to build an orrery?

The goal would be an animated, variable-speed, 2-D view from celestial north of the Sun and planets. A stretch goal would be showing photorealistic rotations of CelestialBodys as a function of time. I ...
An ominous cow word's user avatar
1 vote
0 answers
212 views

Transformation of Covariance Matrix from EME2000 to LLA

I am a little bit confused regarding the transformation of a covariance between EME2000 and the LLA-representation of a state (lat,lon,alt). Let's say I have a timeseries of spacecraft states, ...
tensorBoy's user avatar
4 votes
2 answers
979 views

Would the Dzhanibekov effect be a problem for Von Braun Wheels?

If we look at Von Braun's Space Station, we can see that the axis is not completely symetrical. It is longer from one side: Von Braun Space Station 1956 - YouTube that looks a lot like this T-shaped ...
Mister Smith's user avatar
-2 votes
1 answer
134 views

Did the Coriolis effect cause 'original spin'? [closed]

I just recently wondered if Coriolis effect (I'm strongly resistant to saying "Coriolis FORCE") is the origin of the spins that permeate our cosmos. For a rotating frame of reference needed ...
BradV's user avatar
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14 votes
4 answers
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How does Spinlaunch manage the counterweight right after launch?

Spinlaunch has successfully launched a suborbital test vehicle from a 1/3 scale demonstrator, see for instance aviationweek.com or space.com. While spinning up the arm, perfect balance is achieved ...
jrouquie's user avatar
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15 votes
1 answer
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How much energy is lost by damping yaw from a SpinLaunch?

SpinLaunch hopes to launch a 200 kg satellite from a ground-based centrifuge, at 5000 mph, and more troublingly, at 450 rpm aka 7 tumbles per second. (The 3000 rpm figure mentioned in its tech sheets ...
Camille Goudeseune's user avatar
4 votes
0 answers
207 views

What is the highest RPM achieved through a spin-stabilized rocket/spacecraft?

The title explains it all. I know that the Star 48 kick motor rotated at 60 rpm through its burn. I'd like to know the fastest a rocket/stage has spun during a launch, as well as the highest ...
WarpPrime's user avatar
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10 votes
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How do the roll-rings at the ISS work?

I get that on the ISS they need to keep the solar panels constantly rotating to keep them looking towards the sun. To transmit the electricity and data to and from the Solar panels truss structure ...
4.12.22.4.18.0.'s user avatar
-1 votes
1 answer
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Eliptical orbit [closed]

If an object revolves around the earth in a perfectly circular path, where the center of the circular path is different from that of the earth, (which means the object is close to earth's surface at ...
Niranjan's user avatar
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5 votes
1 answer
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How do orbits around Jacobi ellipsoids behave?

The Earth is a Maclaurin spheroid (aka. oblate). This affects orbits, most notably $J_2$ rotating the node line for inclined orbits, enabling thins like Sun-synchronous orbits. But the Maclourin ...
SE - stop firing the good guys's user avatar
6 votes
3 answers
2k views

Can an orbit rotate around a non-orthogonal axis?

I'll attempt to draw a mental example, in case images are not kind (if they are kind, you can likely skip this first paragraph). Let us say that the Earth is at it's aphelion (arbitrary choice), and ...
Default Cube's user avatar
1 vote
0 answers
25 views

What is the fastest that ParkinsonSat spun? Did it vary with solar activity?

Why would photon pressure be needed to keep ParkinsonSAT Spinning? explains that it was equipped with surfaces that resulted in a sunlight-induced torque which have ...succeeded in keeping the ...
uhoh's user avatar
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-4 votes
1 answer
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The rotation speed of the sun's equator in degrees per second [closed]

I'm just looking for a °/s speed of the suns equator. I'm coding a sun in unreal engine, so I'm looking for its equator speed. I've seen two incorrect posts using different speeds per day, and I'm too ...
TheUnluckyManiae's user avatar
2 votes
1 answer
3k views

Converting J2000 to ECEF?

Say I get the orbital elements for the ISS from JPL Horizons. Say that data is expressed in J2000, an inertial frame. I want to express it in ECEF. This is a simple rotation transform. All I need is ...
user avatar
4 votes
2 answers
2k views

How to find ECI coordinates for a circular orbit

Suppose a satellite is orbiting Earth in a circular orbit, of which I know the inclination $i$, the right ascension of the ascending node $\Omega$, the semi-major axis $a$ (or orbit radius given that ...
cholo14's user avatar
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11 votes
2 answers
2k views

Using a fidget spinner to rotate in outer space

There is a question How do astronauts turn in space?, and related questions here and on physics.stackexchange, that detail how astronauts might maneuver by spinning their upper and lower body ...
StefanH's user avatar
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J2000 to current ECI transformation matrix

I want to find the transformation matrix that converts an ECI frame at some time 't' (lets say t = 1st January 2020) to J2000 ECI frame (that is ECI frame at noon of 1st January 2000). From what I ...
Ayush Mehta's user avatar
1 vote
0 answers
86 views

Which X-15 and SpaceShipOne flights took Coriolis forces into account on their flight path?

I wonder whether those X-15 and SpaceShipOne flights that reached space took into account the rotational Coriolis forces, so that they wouldn't reenter above a location where it would be too far from ...
Giovanni's user avatar
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7 votes
2 answers
1k views

Would a Foucault pendulum work on the Moon and on the Galilean moons?

I wonder whether the Moon and the Jovian moons spin fast enough for a Foucault pendulum to swing on their poles. For instance, I think that it wouldn't swing on Mercury and Venus because these planets ...
LoveForChrist's user avatar
1 vote
0 answers
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Why spacecraft 's trajectory is shown undulating curve on 2D image of earth? [duplicate]

As i am watching live-stream of Demo-2 mission,the trajectory of a capsule is shown curved(like sin wave). In other words, why their trajectory isn't along longitude so that in 2D, the path followed ...
Auberron's user avatar
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4 votes
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174 views

How can I generate Chebyshev cofficients from SPICE for J2000 Inertial to Moon ME Frame?

I want to extract the Chebyshev coefficients in order to be able to calculate the time-varying transformation from the ICRF / J2000 Inertial frame to the Moon ME (moon mean earth) frame. I know I can ...
Shen Ge's user avatar
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3 votes
1 answer
208 views

Query on movement of space shuttle during lift off: Three examples

I have a small query here on the three different movements that I perceived after looking at videos during take off of Challenger (1986), Columbia (2003) and Atlantis (2010). Challenger (1986): ...
Suddhasattwa Ghosh 's user avatar
1 vote
1 answer
129 views

How are satellites, rocket launches and other space programs affecting the earth’s rotation? How will it be affecting living beings?

Want to know the effects of the active satellite, rocket launches and space programs that affect earth rotation? how? And their effects on living beings due to effect in earth rotation?
Yash Gadhade 's user avatar
2 votes
1 answer
236 views

Is the retrograde (clockwise) rotation rate of Venus speeding up or slowing down?

In the update of the question "Would it be possible to "ride the wave" on Venus ?" there are links to articles in Science and in Science News that report that the atmosphere of Venus, hitting the ...
Cornelis's user avatar
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1 vote
1 answer
106 views

Optimal shape for a spinning ship/station - downsides of spheres? (Radiation shielding)

What is the optimum shape for a spacecraft? So I've already read this link, and a few other similar ones, and the main issues I am already aware of... but yet it still seems like a large majority of ...
nirurin's user avatar
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2 votes
1 answer
310 views

Does "Air Launch to Orbit" makes the best use of Earth's Rotation?

Usually, all artificial satellites are launched in the prograde direction, since this minimizes the amount of propellant required to reach orbit by taking advantage of the Earth's rotation. Further, ...
Vishnu's user avatar
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7 votes
2 answers
525 views

Do satellites in orbit undergo translational motion or rotational motion, when initially they are not given any additional spin?

Regarding the proposed duplicate: Thought the proposed duplicate has a similar titIe, I have read those answers and this question requires a different answer. We know satellites orbit around Earth, ...
Vishnu's user avatar
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0 votes
1 answer
119 views

How does water respond in 0g?

I'm imagining a small orb magnetically suspended inside a sphere of any paryicular size floating in 0g. What would happen if you rotated the orb at a high/varied velocity? And what if you change the ...
Ruess's user avatar
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7 votes
1 answer
357 views

Would air circulate in a rotating station on its own?

I know air circulation was a tricky problem on the ISS . I think that in a rotating station the air would be moving with the station, but the air against the “floor” would be moving faster or have ...
oeste's user avatar
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6 votes
1 answer
400 views

Did the manned NASA capsules rotate during descent?

Watching the NS-11 launch, I noticed that during descent when the main chutes were deployed, the capsule rotated quite a bit, and would rotate back. Was this an issue as well during the Mercury/...
CBredlow's user avatar
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4 votes
2 answers
319 views

How to slow a spinning spacecraft externally?

I came accross the is question What are the consequences to breaking the ISS? and wander how would a spacecraft be made to stop spinning from the outside? Scenarios might include (but are not limited ...
Muze's user avatar
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22 votes
3 answers
3k views

Qualitative differences between gravity and a spinning habitat

I'm aware that living in a spinning habitat has a couple of noticeable differences from being on terra firma. For instance, running in the direction of the spin ought to make you feel heavier, while ...
Ingolifs's user avatar
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7 votes
3 answers
1k views

Does a change in the rotational speed of something on its own axis (rpm) affect its orbit?

For example: if a satellite in orbit around earth had its prograde rotational speed increased from 60 rpm to 600 rpm, would its orbit be affected? Another example would be if earth’s rotational speed ...
ngundling's user avatar
  • 145
6 votes
3 answers
1k views

How much does the rotation of the Earth affect re-entry and could we go against it?

I was thinking about how many things are affected by the Earth's rotation, and was wondering how much more difficult a retrograde re-entry would be (where the Earth's rotation direction is assumed ...
Magic Octopus Urn's user avatar
8 votes
1 answer
805 views

Practicalities of docking with a large spinning space station

We've all seen countless examples of spinning habitats in fiction. However there are certain practicalities with these space stations that I can't get my head around, namely around how you'd dock with ...
Ingolifs's user avatar
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1 vote
0 answers
19 views

Rotating modules for ISS [duplicate]

Are there any offcial plans to introduce rotating modules for ISS? There are many theoretical considerations to do so, but is there more to it?
J. Doe's user avatar
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6 votes
2 answers
449 views

Could the Galilean moons tidally lock Jupiter?

From my understanding, given enough time, the gravity of the Moon is gradually increasing the time it takes for Earth to rotate around its axis, and that, as a result, in the distant future, Earth ...
Happy Koala's user avatar
6 votes
3 answers
5k views

How come we don’t put a huge windmill-like machine in space? [closed]

I am new to this sight, but since space being a vacuum there is little to no air resistance at all making a windmill spin forever. There is no wind in space however, if you spin it once, it should ...
unixcycle's user avatar
2 votes
2 answers
171 views

How much will Bennu rotate faster and faster with mirrors facing the Sun on its left side?

Several answers to the question "Why paint only one-half of Bennu" describe the Yarkovsky effect as an important force acting on the asteroid 101955 Bennu. But what about the radiation pressure of ...
Cornelis's user avatar
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6 votes
3 answers
13k views

How to calculate the speed of rotation of a given point on the Earth's WGS84 ellipsoid, about its axis?

Launches often happen near the equator in order to take advantage of Earth's rotation speed. This is why more launches are towards the East than towards the West. How can one calculate the speed of ...
Ed Rojas's user avatar
6 votes
1 answer
260 views

Moment of Inertia of a planet

Radio Doppler measurements were taken with Viking and twenty years later with Mars Pathfinder, and in each case the axis of rotation of Mars was calculated. By combining this data the core size was ...
zephyr0110's user avatar
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5 votes
2 answers
495 views

Would space ship/station rotation for artificial gravity cause the "axis" to also rotate?

Would space ship/station rotation for artificial gravity cause the "axis" to also rotate similar to that of a helicopter with out a tail rotor? Additionally would a second rotating section going in ...
Gip's user avatar
  • 51
2 votes
2 answers
458 views

Could a satellite levitate above the magenetic fields of Earth?

Like the toy the base of the levitation could the Earth be the base and the space station the levitron? https://earthscience.stackexchange.com/questions/13854/where-on-earth-is-the-magnetic-field-...
Muze's user avatar
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0 votes
2 answers
5k views

How do constellations appear to stay constant despite Earth's spin and orbit? [closed]

Our Earth is spinning and also orbiting the Sun, so how do the constellations appear fixed and constant? Almost all galaxies and stars are said to be fixed relative to constellations.
jin's user avatar
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1 vote
2 answers
1k views

Is centre of mass a factor in space without gravity?

Quick disclaimer; I'm not that well informed on many of the mechanics on space in general so sorry if this question is rather easy/basic. Is the center of mass in a object a factor in space when ...
codedcosmos's user avatar
5 votes
1 answer
196 views

In what circumstance would it be useful for a satellite’s angular velocity to differ from its reference frame’s angular velocity?

Casually reading “orbital mechanics for engineering students” on rigid body attitude dynamics, i see the following passage: $$M_{net}=\dot{H}_{rel} + \Omega\times H$$ Keep in mind that, whereas $\...
Paul's user avatar
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2 votes
0 answers
128 views

Asteroid Catalog

Where can one find asteroids or comets that contain water ice suitable for a human mission. Perhaps there is comprehensive catalog of small bodies that can be searched for characteristics such as: ...
Clouds AO's user avatar