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Questions tagged [satellites]

Satellite is a generic descriptor for any body that orbits a much larger body. The term commonly refers to objects orbiting planets, like artificial satellites and moons, but it can sometimes also refer to planets, small stars, satellite galaxies, and other objects.

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A man on much faster spinning Earth decides to jump

Imagine that the Earth is spinning much faster than real situation and a man on the Earth's surface feels weightless. Suddenly the man decides to jump vertically with respect to the Earth. What will ...
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Electron distribution in Low Earth Orbit

I have been searching online for some kind of pdf function that describes the charged electron distribution in Low Earth Orbit in regards to their energies. Any ideas on whether something like that ...
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Angular momentum in Rotating Frame for satellites

I am working on satellite orbit propagator, I am propagating the satellite position and velocity in the inertial and rotating frames. To validate my propagator, I am checking the angular momentum and ...
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How does a satellite take pictures when the surface seems to be always cloudy/white?

I've just opened ISS video on youtube for the first time, and I must say I'm underwhelmed. There are no oceans/landforms. It's all white everywhere. I'm a bit confused how the satellites can take ...
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What is the orbit of SDO (solar dynamics observatory)? How does it takes images of Sun non-stop?

There is a orbital diagram given in sdo website https://sdo.gsfc.nasa.gov/ It takes images of sun 24hr.
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Gravitation question

I’d like to ask the following doubt that came to me after some exercises: Is it possibile to exactly establish,given a satellite orbiting Earth with a certain $\vec v_{0}$ and distance $\vec R_{1}$ ...
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What happens if the gravitational force on a satellite is greater than the centripetal force needed to keep it in circular motion?

Will the satellite continue to orbit the Earth, albeit not in a circle? Why? I would greatly appreciate it if someone could help me address this query. :) Also, I think someone asked a similar ...
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Total Energy of the ISS orbiting the Earth [duplicate]

I had a bit of confusion earlier about a discussion in astrophysics. I was reading that the ISS orbits the earth at $8 kms^{-1}$ but then when I calculated the total energy that the ISS had, I was ...
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Space Elevator - Could We Do It?

'Elevator to Space' or 'Death-o-Swing'? During one of my ever increasing day-dreams; I remembered something I heard in respect to a theoretical 'Elevator to Space' and I was wondering what you guys ...
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Orbital Mechanics - How does space debris damage the ISS?

This question is rather self explanatory so I'll keep I succynct. A while back Tim Peake photographed a small crack in the cupola of the ISS, which was reportably a paint fleck that collided with ...
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Latitude of Impact of a satellite

I'm currently studying orbital mechanics, and am tasked with finding the latitude of impact of a suborbital satellite, given its location and velocity in geocentric coordinates at some time. Assume ...
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Is it possible to harvest the energy from the movements of a satellite in orbit?

I was thinking about how energy is harvested on Earth from movements of certain forces like wind and ocean currents. Could similar principles be applied in space? Satellites are virtually in ...
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What does a geostationary satellite move relative to?

What does a geostationary satellite move relative to? I can't come up with a good answer. You don't move relative to the center, neither do you move relative to any location on the Earth. Does entropy ...
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Gravitation (satellite around earth)

When a satellite in a circular orbit around the earth enters the atmospheric region it encounters small air resistance to its motion. Then it's said its kinetic energy decreases. But I can't ...
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Why do satellites settle into elliptical orbits?

When a satellite in a circular orbit around a planet is given a sudden speed boost, it tends to settle into an elliptical orbit, with the planet at one focus. Why does it settle into an elliptical ...
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Can a satellite park between the Earth and Sun?

If you put a satellite at Geostat altitude travelling the wrong way, will it remain between the Earth and Sun?
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Why can't we see the satellites?

We can see stars that are many light years away from the earth but why can't we see a single satellite in the sky?
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Changing orbits by an impulse

I have read several stack exchange posts on this, and this one was certainly quite close to my query, but i am still not getting it entirely. I cannot motivate why providing an impulse tangent to an ...
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Position of an observer on the earth [duplicate]

Imagine there is an orbiting space station (rotating about an imaginary axis), which is observed to remain always vertically above the same point on the Earth. Why the observer must be on the equator ...
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What are the Standards Of Fundamental Astronomy calls to convert between ECEF and J2000?

I found this stack exchange post to be informative but not actually helpful. I am using SOFA (the C version), but the "correct" ICRF <=> ITRF conversion is not what I need. If ICRF is J2000 (...
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geo-synchronous orbits not over the equator

I need to know if a satellite with onboard power can maintain a geo-synchronous orbit at, for example, 45 degree latitude?
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Satellites around flat Earths

Apparently the latest great idea of flat earth crackpots is launching a satellite to "prove" that earth is actually flat. Now, without actually commenting on this "plan" (let's not feed the trolls), I ...
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Satellite-spaceship problem [closed]

A spaceship is placed in orbit around the Earth. The orbit is assumed to be circular and lies in the earth's equatorial plane. The spaceship released a satellite S, which is attached to a conducting ...
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Why does Kepler's Law not apply to geostationary satellites?

The radius of orbit of the earth around the sun is equal to 1 AU and the period is 365.25 days(a year). Kepler's Law, $T^2\propto r^3$ prop to $r^3$ then means that $(T/365.25)^2 = (r/AU)^3$ gives the ...
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Will precession cause geosynchronous satellites to become non-geosynchronous?

Will the precession of Earth cause geosynchronous satellites to eventually become non-geosynchronous? I can't think of any reason why they would follow the changing axis. And can anything be done ...
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Do the geostationary satellites actually revolve around the Earth?

Since the velocity of rotational motion of Earth equals orbital velocity of the satellite, they are relatively at rest to each other. If so the satellite should be at constant position above the Earth'...
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How does the satellite orbiting the Earth, first slows down to some extent, and speed up again to maintain the orbital motion? [closed]

We consider that the satellite has time period equal to earth's rotational period, because of equal magnitude of orbital velocity, if that is so, it's at rest relative to earth's rotational motion ...
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What is a “mean earth orbit”?

I have been researching about different satellite orbits online for a while now. I have read documents about low earth orbits (LEO), medium earth orbits (MEO), high elliptical orbits (HEO) and ...
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What methods can be used for the numerical integration of an equation involving the rotation of the Earth?

I've got an expression which involves the usual Newtonian gravitational potential $\phi$ for a near-Earth object orbiting the Earth with position $r^j$. This potential is expanded up to and including ...
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What is the difference between kinematically non-rotating and dynamically non-rotating reference frames?

Well the question in the title basically sums everything up but to put it in more context... I am trying to wrap my head around the relativistic Geocentric Celestial Reference System (GCRS). Reading ...
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What happens to a satellite's orbit when you speed it up?

If a satellite is initially orbiting the earth with a constant velocity $v$ on a circular orbit. What would happen, if the velocity is suddenly increased by 5%? Would the orbit still be circular? I ...
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Orbits of Saturn's moons inside its rings

Hypothetically speaking if a solid artificial satellite is injected into one of Saturn's rings, what natural Newtonian orbit does it take? Is gravity force modelling of dust particle orbit done? ...
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Can there be other Positions of Geostationary Satellites? [duplicate]

My book says that Geostationary Satellites can only be found in the equatorial plane. I wonder if there would be any other planes about which they could revolve around the earth.
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If relativity is symmetric, do the satellites in the GPS system see the earthbound clocks as running slow due to relativistic time dilation?

If relativity is symmetric, do the satellites in the GPS system see the earthbound clocks as running slow due to relativistic time dilation? How much slower does the satellite see the earthbound ...
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Is energy conserved during a Hoffman maneuver?

I have searched a lot about this, and there is a lot out there. But I can't seem to find the answer to this simple question. The scenario is that i want to change a satellites orbit. So I increase the ...
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Maximum Doppler shift at solar escape velocity

I'm new to this site, so hopefully I'm asking the right question to the right people. I have this question that has me slightly stumped: An interplanetary spacecraft at $5$AU (which I calculated as ...
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Could a planet with a strong magnetic field exert a diamagnetic force on an orbiting moon?

Here is a question from the world building stack exchange. https://worldbuilding.stackexchange.com/questions/79003/making-a-slow-orbit-around-a-large-gas-giant Requested: a means to have a moon of ...
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Why is space debris an issue?

I have been reading that space debris is super dangerous and is an issue of greater and greater magnitude as time progresses. But I don't completely understand this. Sure, a small particle the size ...
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How do satellites accelerate in space?

We are told right from childhood that space is just vacuum and so I wondered if the space is empty then how come satellites accelerate in space. Newton's third law is applied, to accelerate any body ...
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Principle of launching satellites into orbit

I was reading in a book about the basic concept of launching satellites into orbit. I came across a paragraph saying, If we take a body high above the surface of the earth, and then project it with ...
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Can there be an orbit beyond the Geostationary orbit?

I am interested in knowing if we can place a satellite beyond the geostationary orbit. I know that we can send objects beyond that, but can a normal satellite do all its functionalities in that case?
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Free fall around Earth

Is it a necessary condition that a satellite must be given an initial perpendicular velocity so as to make it orbit around the Earth? Will it go into orbit if dropped with zero initial velocity?
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Derivation of Post-Newtonian (PN) expression for acceleration in Schwarzschild geometry

The expression for the acceleration of a near-earth satellite as presented in the IERS Technical note is given by \begin{equation} \label{eq:problemeq} \tag{1} \frac{d^2\mathbf{r}}{dt^2} = \frac{GM_E}{...
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Projection from satellites

when a object is thrown from a orbiting satellite, does the orbit of the object pass through point of projection while orbiting (Of the velocity is less than escape velocity). If it does so why?
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Transition from an elliptical orbit to circular orbit [closed]

This is just a small problem that I was wondering about. Supposed we have a satellite of mass 'm' in an elliptical orbit about earth of mass 'M'. Since the orbit is elliptical, the speed varies from ...
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How to calculate torque on a satellite?

Suppose we have two satellites $X$ and $Y$, orbiting the Earth. The orbital radius of satellite $X$ is four times that of satellite $Y$. There is one question asking me to compare the torque on each ...
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Geostationary Satellite

I am unable to understand one particular thing about geostationary satellite. Let us assume that I am on earth at a particular place and remain there (moving with the place during rotation) such ...
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How are three satellites sufficient to find a unique point in GPS? What happens in case of an overlap? [closed]

Is it because the 2nd and 3rd satellites' centres are collinear? How is satellite overlapping avoided? If not avoided then what happen to the signal sent from an overlapped satellite?This is just a 2D ...
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Why do satellites not burn up in space?

I really liked Pentane's response to another question on this site about Heat Transfer in Space . My question is this, how do spaceflight capsules or satellites maintain their integrity? Given that ...
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Do relativistic phenomena affect communication with satellites?

Communication with satellites certainly requires knowing the speed of light. Beyond having that magic number, do relativistic phenomena affect communication with satellites? For example, would one ...