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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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How accurate does the ISS's velocity and altitude need to be to maintain orbit?

We know the the ISS is not drifting weightless in space, but rather is constantly falling as it circles the Earth. To do this it must be at a specific altitude and moving with a specific velocity. ...
foolishmuse's user avatar
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What would happen to the moon's orbit if we reduce (instantaneously) its mass? [closed]

In my opinion the moon's orbit shouldn't change, because an orbiting body is a free falling object and the trajectory of a free falling object is not affected by its mass (because the inertial mass ...
Suppiluliuma's user avatar
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Has our knowledge of astrophysics and gravity reached the point where we can accurately calculate Lagrange points?

is it possible for us today given the knowledge we possess of gravity and our success with inserting satellites in to steady/ geosynchronous orbit and any knowledge we have on the relative size (and ...
Matt Bartlett's user avatar
-14 votes
1 answer
120 views

Do satellites in orbit create Relativity paradoxes? [closed]

Can someone point out the flaw in this very realistic scenario below? I will start by stating established first principles of the applicable orbital and relativistic conditions. Then I will describe ...
Anakin Skywalker's user avatar
2 votes
1 answer
645 views

Can a satellite generate electricity by using a planet's magnetic field? [duplicate]

I am entering AP Physics E&M and don't have much knowledge about electricity but always had an idea based on my limited knowledge. If a satellite had a metal coil inside of it, wouldn't it have an ...
Frontiers Aerospace's user avatar
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31 views

Better equations for modeling and simulating a halo orbit?

I'm trying to model a halo orbit at low altitude (10m from surface). The satellite is using propulsion to trace the circular halo path. It looks like this "from the top" (the blue ball is ...
Nico Brenner's user avatar
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1 answer
32 views

How can the current be sustained in a tethered satellite system?

I have a question about how the current is sustained in a tethered satellite system TSS-1R. In the most simplified model, the system is basically a straight wire (connecting the shuttle and satellite) ...
Szeto's user avatar
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Would an Hypothetical Ringworld Positioned Inside the Moon's Orbit Around Earth, gravitationally affect Earth?

If a ringworld were to encircle Earth within the orbit of the Moon, would it induce any gravitational alterations on Earth? I grasp that inside a circular structure, there might not emerge a ...
wepajakeg's user avatar
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Elevation angle of LEO satellite as a function of time

Let a point on Earth be denoted with (lon,lat,altitude). Let a LEO satellite be defined by its altitude and inclination. I would like to compute the angular speed and elevation as a function of time. ...
baptiste's user avatar
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25 views

How does moving the pericenter affect the apocenter?

A perfectly circular orbit of a constant height (distance from the center of mass of the orbited planet) around a perfectly spherical planet with smooth surface and no gravitational anomalies will ...
Parzh from Ukraine's user avatar
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Potential Perturbation of the Ionosphere by Artificial Re-entry Plasma Dust

Recently I read on Spaceweather.com https://spaceweatherarchive.com/2024/02/ a surprising paper according to which the space debris or vaporized material (mostly metals) that has been deposited in ...
Cisfinite's user avatar
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4 answers
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Why doesn't the Moon disrupt the orbits of geostationary satellites?

If a passing star can jostle comets in the Oort Cloud, why doesn't the Moon disrupt the orbits of high-flying satellites? Or does it? Maybe the satellites need periodic course corrections?
RASx64's user avatar
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At what angle should an object be thrown to get it into orbit?

Yes this question is on the internet and has a lot of answers but they all suggest orbital velocity in an ideal circular orbit. I want it for an elliptical orbit. I have a few questions and ...
Star Gazer's user avatar
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124 views

Calculating Azimuth, Elevation and skew angles when pointing toward sattelite

I have some phased array antenna which is installed on aircraft and pointing itself (azimuth, elevation, skew polarization angles) by plane angles (lat, long, roll, pitch, heading) and satellite ...
user1977050's user avatar
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2 answers
75 views

Book Recommendation about radio frequency antennas and satellites

I have recently obtained a job in the field of radio frequency antennas and satellites, and I am interested in delving deeper into the subject. Could you recommend any books that cover these topics ...
1 vote
2 answers
153 views

Is a satellite revolving in Earth's orbit also affected by the gravity of the Sun or other planets?

The Earth revolves around the Sun and a satellite also revolves around the Earth. The Sun has a gravitational effect on all celestial bodies, so does it also have an effect on the satellite? If so ...
Vidushi Aggarwal's user avatar
6 votes
3 answers
781 views

Is the mass of Satellite + Earth system less than their individual masses?

I understand that when a Earth + Satellite system forms (satellite comes into orbit) the total energy is -ve. If the energy of the system when placed at infinity is 0 (assuming P.E and K.E is 0 at ...
Alex's user avatar
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1 vote
1 answer
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Is it possible for 4 satellites cannot render a position fix on Earth?

I recently learnt about how GPS works and how it uses the intersection of spheres to locate a person which got me thinking whether 4 spheres can always guarantee a position fix. My understanding is ...
Nullity's user avatar
  • 25
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1 answer
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How to calculate losses due to diffraction?

Assume a transmitter with a laser source generating gaussian beams and is transmitted using a telescope with radius of aperture $a_T$. The light is collected at the reciever end using a telescope of ...
Dotman's user avatar
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5 votes
2 answers
145 views

Will a very long space ship orbiting the Earth appear to have gravity to someone inside?

My friends and I have several disagreements about this scenario: Imagine a rigid cylinder that is the length of the diameter of the earth. At either end of this cylinder is a capsule with a person ...
Casey's user avatar
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2 votes
1 answer
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Basic: calculating a satellites height from its angular speed

A few days ago, while loooking at the night sky, I saw a satellite and I wondered if it would be possible to tell how far it is just by looking at it. The only possible naked-eye measurement that I ...
Pablo's user avatar
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2 votes
1 answer
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Question regarding Time dilation of satellites

My name is Shaun Kant. I was wondering about why the satellite's time is faster with respect to Earth's time. PBS space time mentions that fact. However, Wikipedia mentions that at the ISS (...
SMK's user avatar
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1 answer
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Number of Geostationary Orbits

It is stated that there is only one geostationary orbit whose height can be calculated using:- $H = [\frac{GM_ET^2}{4π^2}]^{\frac{1}{3}} - R$ But there can be more than one geostationary orbits if I ...
user avatar
3 votes
1 answer
210 views

Acoustic guitar pickups used in satellites: why? [closed]

Some years ago, a weather satellite manufacturer in the SFO bay area was buying small quantities of piezoelectric acoustic guitar pickups from one of the big music supply houses, which greatly puzzled ...
niels nielsen's user avatar
25 votes
3 answers
8k views

Why don't we put satellites into an orbit where there is (almost) no time dilation/contraction compared to Earth's surface?

Consider: On this image, if I understand correctly, the time dilation diagram is shown depending on the height for circular orbits. First in low orbit, time slows down relative to the surface due to ...
Join the party P.A.R.T.Y.'s user avatar
0 votes
2 answers
179 views

If the Moon suddenly got heavier/lighter, would it crash into/fly away from the Earth, or would it stabilize at a different orbit?

If the Moon became suddenly gained 20% of its mass, would it come crashing down to the Earth, or would it just stabilize at a lower orbit? Similarly, if it suddenly lost 20% of its mass, would it fly ...
chausies's user avatar
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33 views

How much does mass center of satellite oscillates about elliptic orbit as its spinning around the Earth?

I would like to know how much the real orbit of satellite can differ to the elliptic one. Some perturbation of mass center position of the satellite must occur - Earth gravity accelaration changes as ...
lodzki's user avatar
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0 votes
2 answers
72 views

How can people be weightless on space station?

I had read it somewhere that on the space station, people are weightless. even though artificial gravity is created there, people are still weightless. how can this be possible if there is gravity, ...
emaan fatima's user avatar
2 votes
1 answer
125 views

Why won't a pen work on the International Space Station?

Today, in my physics class, we were discussing the effect of microgravity (specifically on the ISS) on various objects of everyday value. I learnt that a normal pen wouldn't work in space (So they ...
Golden_Hawk's user avatar
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Distribution of Earth's mass and its role in the nodal precession of satellites?

From what I have read and understood so far, the nodal precession of a satellite in low Earth orbit is caused by the bulge equatorial of the Earth (caused by its rotation on itself) which moves the ...
Sebastyen Laroche's user avatar
0 votes
2 answers
58 views

If a satellite is shut down, will it eventually reach the high temperatures of the exosphere?

If a satellite is shut down so that it neither generates additional heat from whatever internal energy source it might have, nor is able to dissipate heat by an active cooling system, will it ...
Wood's user avatar
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1 vote
0 answers
122 views

Payload ideas for an 1U CubeSat [closed]

I don't know if this is the relevant site for such questions, but I am asking it anyway. Our school has taken up a project on launching a CubeSat and I am part of the 45 contributing students. We are ...
Golden_Hawk's user avatar
  • 1,064
1 vote
0 answers
62 views

What is a 'satellite' in solid state physics?

During a course, my professor talked about satellites. He defined them as an excitation which results in an electron-hole pair, in a system of interacting electrons. So that the energy of the ...
Mirz's user avatar
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5 votes
2 answers
107 views

Orbital period around slowly rotating star in general relativity

I want to compute the general relativity prediction for the difference in period between clockwise and countercloskwise orbits of a planet around a star which has small mass $M$ and small angular ...
thedude's user avatar
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1 vote
0 answers
34 views

Work needed to orbit earth

In school I have always been told that it's better to launch spacecrafts from around the equator to utilize earth's rotation. Now, when wanting to theoretically put a large object with a lot of mass ...
Mepep's user avatar
  • 105
4 votes
5 answers
431 views

Orbital motions

Suppose two satellites are moving in circular orbits around the earth and then crash into one another. My Question is this, how do we know that the bodies move in an elliptical orbit after the crash? ...
BlazingLight's user avatar
0 votes
1 answer
57 views

How is the potential energy of a satellite/planet in orbit derived?

Recall that for a Hookian spring: $F(r) = -kr$ (force vector and radius vector point in opposite directions, hence the negative sign) Since negative work is a positive change in potential energy, $$U(...
doorwish's user avatar
0 votes
2 answers
94 views

Orbital height without the gravitational constant and the mass of either object [closed]

Is it possible to calculate the orbital height of an object using only the orbital period T = 93min, radius of the Earth R = 6378km and the gravitational acceleration at the surface of the Earth g = 9,...
Jan Hrubec's user avatar
1 vote
1 answer
108 views

What does a Space radiator/cooler look like exactly? [closed]

I understand the principles of radiating heat to space using heat pipes and whatnot but what exactly do these devices look like in real world applications? The closest example for a space base ...
Xi Jinping Official's user avatar
1 vote
2 answers
211 views

Finding rate of change of the distance from an observer on earth to a satellite in orbit

This is a satellite motion related question. To give context, imagine a satellite orbiting Earth at a distance 'R' from the center of the Earth at constant velocity 'v'. An observer on the surface of ...
Akshay K Sathish's user avatar
0 votes
2 answers
107 views

Amount of Force to De-orbit a Satellite [closed]

Assume I have a Low Earth Orbit (LEO) satellite of mass $m$ and velocity $v$ that I would like to de-orbit, assuming I have a propulsion unit, how much force do I need to make it de-orbit, and how can ...
Mohamed Abduljawad's user avatar
-3 votes
1 answer
103 views

Is it possible to make a satellite orbit Earth, the same way Earth orbits Sun? ( Same orbital path pattern)

Is it possible to make a satellite orbit Earth, the same way Earth orbits Sun? (Same orbital path pattern) Earth's Orbit
Origin's user avatar
  • 95
0 votes
1 answer
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Would obliquity and precessional changes of Earth affect the accuracy of GPS-based measurement of tectonic movements?

The rate and direction of tectonic movements can be measured by comparing the coordinates of the same GPS receiver over time. The coordinates are obtained using trilateration. All materials I could ...
seamos's user avatar
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1 vote
0 answers
48 views

Satellite’s Position and Path on 2D Map [closed]

When the ISS orbit the Earth, its path traced on a 2D Mercator Earth Map is similar to a sinusoidal wave. I am wondering is there any way to determine the trig function of the wave, knowing the ...
Dian Sheng's user avatar
1 vote
1 answer
66 views

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 ...
Imp's user avatar
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0 votes
3 answers
204 views

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 ...
user avatar
1 vote
1 answer
229 views

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 ...
Parth Shresth's user avatar
0 votes
0 answers
18 views

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. ...
Aryan Gupta's user avatar
0 votes
1 answer
78 views

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 (...
Seeker's user avatar
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2 votes
0 answers
122 views

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 ...
mmesser314's user avatar
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