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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Find location of geo satellite [closed]

Assuming I'm located at lat/long 33.023N/30.875E and looking at angle $247^\circ$ (related to the north). If one would draw a line to the equator (where the geo satellite would be located), at which ...
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Satellite Collision with other objects

I am looking for a detailed physical study on the collision of satellites with other objects while moving in their orbit
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How could Webb's lifetime be extended? [migrated]

This article says why the lifetime of the Webb telescope is limited by the fuel it carries. Why NASA’s James Webb Space Telescope Will Never Live As Long As Hubble In short, Webb must stay near the ...
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How does one generate a formula(s) for an artificial satellite's location at time $t$ given a set of known locations at discrete times?

Given a set of spatio-temporal points in space {(Lat_1, Lon_1, Alt_1, Time_1), ... (Lat_n, Lon_n, Alt_n, Time_n)}, I need a function (i.e. a formula) that takes these points (or subset of points) as ...
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How fast would a rocket have to go to maintain in the earth orbit without falling down? And how frequent would rocket boosters be needed? [closed]

I was thinking how fast would a rocket have to go to maintain in the in earth orbit? I was thinking of the ISS going 7000kph with rocket boosters every 6 months. What is the most efficient way to ...
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Change in Path of a satellite on changing its velocity

When the speed of a Satellite travelling in a perfectly circular orbit is increased does the path of the satellite remain circular and the radius is increased OR does the path of the satellite follow ...
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How did the electronic components in Parker Solar probe responsible for controlling it and communicating with base station survive high temperatures?

The recent revelations by Nasa that their solar probe had been closer to the Sun by never before distances and aims at getting close to Sun by a mere 6.9 times radius of the Sun around year 2025. ...
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Can I please get the proofs for different trajectories of a satellite when projected at different velocities? [duplicate]

I recently came across a question about the trajectories of satellites, I have tried many resources for the proofs but couldn't find them. For example, a satellite will have an elliptical orbit if (...
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How does the James Webb Space Telescope avoid stick/slip and creep problems when positioning its mirrors?

The JWST is now positioning its mirrors so they form a single image. How James Webb's Mirrors MUST Work To do this, each mirror must be positioned in 8 nanometer steps in 6 degrees of freedom. Here is ...
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Man pushes a satellite

A man M and a satellite S of comparable mass (say 5M) are revolving round the earth in a fixed orbit. Now what will happen if man gives a strong jerk to the satellite in opposite direction to their ...
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How to visualize the frequency of a satellite?

For a satellite I know the period T and frequency f = 1/T. For instance, for an earth skimming satellite with period ...
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Could a large panel of LEDs be used for station keeping in earth orbit?

Hall effect and other ion thrusters require propellant to operate and thus have a limited usable lifespan in orbit. In typical operational use, the force they produce is in the 25mN - 250mN range. It'...
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Is it likely that objects placed at the Lagrange points of the earth-moon two-body system collide?

Is it likely or unlikely that objects placed at a Lagrange point of the earth-moon two-body system collide? It may be assumed that the objects are not self-propelled and are dynamically influenced by ...
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Accelerations of a Satellite Orbiting Elliptically about the Earth

I seem to be at a standstill on an orbital mechanics problem. My work right up until my roadblock is shown below. Consider a satellite elliptically orbiting the Earth (the center of the Earth is ...
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Time dissemination in Solar System IAU expression (apparently) not matching General Relativity general result

I have a question about time dissemination around Earth on in the Solar system. A standard expression for an Earth satellite a proper time shift w.r.t. Earth centered coordinate time (TCG), derived ...
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Determining orbital height of a satellite just by observing angular velocity

A few days ago I obervered a satellite with my telescope. But when I later looked at Stellarium (after adding all available satellite databases), there was no satellite passing the spot that I ...
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Roche limit and satellites orbiting each other

Does the Roche limit apply also to two satellites orbiting each other or only to individual satellites held together by gravity? For example, I have a tungsten little ball (10 cm in diameter) around ...
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NMR Remote sensing - how does it work?

I was watching https://www.youtube.com/watch?v=xdZ3bQRLn0w Generally - you can activate use a strong magnetic field on ground, perturb it, and the pick the signal up with a satellite. The result would ...
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Where does the force tangential to Moon's orbit come from?

Not sure if I'm correct, but as far as I know, while moon is revolving around, it is unable to reach the Earth because the Earth's gravitational force isn't strong enough for that. This presumes that ...
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How to avoid Kessler syndrome with human made satellites? [closed]

It has been a year that I am dreaming to find a way to destroy a satellite in a clean way (push out of orbit or reentrance). I first tought to use the momentum of laser to push a satellite out of ...
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Shadow Time for a Satellite on an Inclined Orbit

I am trying to calculate the shadow time for a satellite on an orbit that is inclined by some positive amount of degrees. I am able to calculate it for a non inlined orbit but i do not know how to go ...
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The accelerate from an elliptical orbit to a circular orbit

If there is a satellite and it is in an elliptical orbit. At the aphelion, it accelerates from its elliptical orbit to a circular orbit. The thing that confuses me is that when the satellite is at ...
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Increasing the speed of satellite to raise an orbit

Suppose we have a satellite orbiting the Earth in an elliptical-closed orbit. When the satellite reaches the perigee, its velocity is increased in the cross-radial direction. According to all the ...
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Orbital collisions? [duplicate]

Russia destroyed a satellite. TV news says the ISS will be at risk of the debris every ~90 minutes. Seems to me that for the ISS to run into the debris, it must be going faster than the debris. But ...
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How do satellites accelerate in space with thrusters?

In my space exploration topic we are learning about satellites. We need to know a bit about thrusters and what they do. However I don’t know how the thrusters accelerate the satellite in space. It ...
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Is it plausible that the explosion of a satellite in an orbit 65km above the ISS will not threaten the ISS?

(Not sure if this is better-suited to the Astronomy SE or Space Exploration SE) Recently in the news was Russia using an anti-satellite weapon to destroy a Soviet-era satellite. The destruction ...
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What is the resulting orbit of objects launched from the ISS?

Two identical masses are launched from ISS at 10 meters per second, one towards the earth and one away. Since their orbital velocity vector has changed by the same magnitude would they have the same ...
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Why is the total energy of a satellite negative?

I have learnt that the total energy of a satellite is negative because it is in a bounded system(closed system). Total energy of a satellite is defined as: $$\text{T.E.} = \text{K.E. + P.E.}$$ and ...
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3-body problem: Is it possible to find real moon orbit if I know kepler's orbit elements for 2body, direction to planet and real gravity force vector?

I have a system of Sun, planet and moon of planet. I can find orbit of moon using kepler's law. But distance between planet and moon is a half of distance between planet and sun. So, if I will ...
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Will a satellite escape from the bounds of Earth's gravity if its orbital velocity is increased to escape velocity?

If orbital velocity $(v=\omega r)$ is increased to escape velocity at that certain orbit, will it move to infinity? I know that it will skid from that orbit as vehicles do when their velocity is more ...
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Lorentz force transmitted to two nodes

A straight wire of length $L$ and direction $\vec{u}$ carrying a continuous current $I$ in the presence of a magnetic field $\vec{B}$ experiences a force (Lorentz force) equal to $\vec{F} = LI \vec{u}...
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Does Earth's rotation affect the orbital velocity of its satellites?

We all know about the spin of black holes. That spin and of course it's gravity determines the minimum distance a star can orbit the black hole with a min orbital velocity. Do we see similar result? ...
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Calculation of the speed of the ISS from the circulation time

This is my first question, and as a chemist, my physics vocabulary is a bit limited. A younger friend of mine asked me about a physics question from school, but I am not able to solve it, and I think ...
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X-Ray data of AGN

I have downloaded spectra of a quasar from the Sloan Digital Sky Survey (SDSS), but it has data in Visible Range. I need data of same quasar in the X-Ray region and I think SDSS don't have data in the ...
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Total energy of a satellite

I have learnt that change in potential energy in any conservative force field is equal to the negative of work done by that field through a distance. While applying the same for gravitational ...
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Hohmann transfer: question on vessel orientation

I am looking at the Hohmann transfer and I would like to apply it to KSP. So I'm trying to see the different formulas needed to calculate the $\Delta V$ needed to change the orbit (only the orbit, not ...
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Transport theorem in spacecraft control: tracking a reference angular velocity

I am reading the book named "Analytical mechanics aerospaces systems" by Schaub and Junkins. In section 7.2, the task is to control the spacecraft to track a specified angular velocity $w_r$ ...
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Energy conservation and calculating second cosmic velocity

I am curious about such a thing. While calculating second cosmic speed we consider this equation: $$E = \frac{mv^2}{2} - G\frac{M_E m}{r_E}$$ which we say must be $0$, when the satellite escapes from ...
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Doubt regarding elliptical orbits and eccentricity relation with masses

I was working with Roche's Limit , You can visit the wikipedia page on Roche's Limit and Hill's Sphere (not important here). A query raised in my mind about the elliptical orbit in which the moon is ...
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Is Acceleration of Earth Constant in its Orbit around the Sun?

According to this link , we can say that the Earth's acceleration is constant as the path is circular. But how ?
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Satellite around a black hole

Let's say there's some satellite revolving around the Earth. Its orbital velocity would be $$v=\sqrt{\frac{GM}{r}}.$$ Evidently, this is independent of the distribution of the mass of the earth, and ...
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Why can't the Chinese rocket Long March 5B keep revolving around the Earth without re-entering?

The out-of-control part of the Chinese rocket Long March 5B is expected to re-enter the atmosphere of the earth and crash on the earth in a few hours. (Today is May 8th, 2021) At the moment, it is ...
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Does the Parker Solar Probe experience radiation pressure being so close to the sun?

Since the Parker Solar Probe does close fly-bys around the sun, does it experience any significant radiation pressure from photons emitted by the sun? Is this push, significant enough to require ...
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Can electricity be transferred via satellites?

Internet data is transferred through satellites. Mobile Networks are based on wireless transfer. Why can't electricity be transferred wirelessly?
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Damage from the Sun on a Raspberry Pi Camera Sensor with a Fisheye Lens

I'm working on a CubeSat mission which uses two Raspberry Pi V2 cameras (without special filters) as sensors. I am trying to estimate if they could suffer thermal damage if they were to have the Sun ...
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Could you use a balloon to show the drag from the gas/atmosphere of something orbitting near the ISS?

If a balloon were floating next to the International Space Station (ISS), how big, light, and/or dense would it need to be such that the gas/atmosphere at that distance from the earth's surface would ...
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Experimental Test for the cyclic $G_{earth}$ prediction of a Cosmological Model

Can anyone suggest a way to measure or rule out a tiny cyclic variation in the earth’s gravitational constant $G_{earth}$, predicted by an alternative cosmological model? It’s an annual cyclic ...
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When does a satellite 'meet' the same place of a rotating earth? [closed]

I'm stuck with a problem on GPS: What I tried is to calculate first turnaround time of the satellite. Secondly I calculated the angular speed of both trajectories. The conditions that need to be ...
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What is the orbital angular velocity of a satellite?

Angular velocity ω is by definition the runned angle $dθ$ per time $dt$ elapsed: $ω=dθ/dt$. If the time elapsed in a specific point on the earth's surface is $dt$, the dilated time elapsed on ...
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Can I use the formula for the centrifugal force to solve this gravitation related exercise problem?

I have a problem in which I need to find the kinetic energy to put in orbit a satellite already at a height $h$. So far I have worked out that $F_g = F_c$ (gravitational force = centrifugal force) so ...
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