Questions tagged [artificial-satellite]

Questions about objects in orbit which are human made, such as communications and GPS satellites, orbital observatories and space stations, and other man-made object in permanent or semi-permanent orbits around the Earth, other celestial objects, aside from the Sun, or even other satellites. Not to be confused with non-orbited man-made objects in space, that are usually referred to as "probes", or simply "spacecraft".

Filter by
Sorted by
Tagged with
9 votes
2 answers
2k views

Is there any satellite that uses LOX as oxidizer?

With Liquid Oxygen being used as an Oxidizer in Starship and some other rocket engines, I was curious if LOX was also used for propelling satellites as well.
Prayag's user avatar
  • 97
2 votes
1 answer
92 views

For using the acceleration due to drag formula, which coordinate frame should the satellite's position and velocity vectors be in?

I am working on simulating the space environment for a VLEO satellite. I am working on the atmosphere model where I am using density values from NRLMSISE00 model and plugging them into the drag ...
Anusha's user avatar
  • 33
6 votes
2 answers
124 views

Would tidal forces be strong enough to stabilize a configuration where one satellite is being used to tow another satellite?

The scenario that I'm contemplating is one in which there is a first "depleted satellite" that has run out of propellant and a second "rescue satellite" that is designed to rescue ...
phil1008's user avatar
  • 3,117
3 votes
1 answer
196 views

connecting two satellites [closed]

How strong would my bond have to be if I wanted to closely connect (30cm - 1m link) two satellites on the same orbit in LEO? (I can move the satellites however I want to have them close to each other) ...
Leonie's user avatar
  • 31
7 votes
3 answers
3k views

How do other satellite and ICBM clocks interact with GPS satellite clocks

I've read this answer about satellites synchronizing their clocks with the Earth frame with adjustments for special and general relativity for speed and gravity. There are some satellites and ICBMs ...
foolishmuse's user avatar
2 votes
1 answer
130 views

How to design a Blowdown or Pressure Regulated pressurization system for a spacecraft?

I am trying to develop a simple tool to size a pressurization system for a spacecraft using either a blowdown pressurization system (BD) or a pressure regulated (PR) pressurization system. Though I ...
Mario Pastore's user avatar
3 votes
2 answers
137 views

sending a satellite in the right direction

I suspect that the required accuracy of satellite velocity direction is very high. This is especially the case for low earth orbits. The radius of the earth is 6400 km. The altitude of a low earth ...
S. Kohn's user avatar
  • 203
15 votes
3 answers
4k views

Have there been any Spacewalks to free-flying satellites?

Talks of a new Hubble servicing mission have made me curious: Has a spacewalk between a crewed craft and a free-flying satellite ever occurred? As far as I am aware, the Shuttle visited satellites and ...
Dragongeek's user avatar
  • 18.7k
3 votes
1 answer
155 views

Does a country need to announce the parameters of its newly launched satellite to the world?

I am wondering if there is any international organization regulating such things. Possibly countries do not need to tell anything about their spy satellites, but should tell about their commercial ...
S. Kohn's user avatar
  • 203
3 votes
2 answers
122 views

Typical external temperature profile for a LEO satellite

I bumped into a question regarding LEO orbit. Is an external temperature profile available in literature as a first approximation for thermal analysis? I bumped into articles mentioning that the ...
Enrico's user avatar
  • 31
2 votes
3 answers
201 views

Disposing of Obsolete Satellites by Propelling to the Sun

I'm not scientifically adept, so bear with me. Would it be feasible to retain enough fuel on new satellites/space stations, etc., that we could dispose of them when obsolete by sending them to the ...
user avatar
1 vote
0 answers
63 views

What is the feasibility of High Resolution (< 5m) Hyper spectral Imaging satellite?

Many companies are coming up with claim of less than 5m resolution of hyper spectral imagery, although the payloads of such caliber could be built, I have come to the understanding that SNR would be ...
Bharath Simha Reddy's user avatar
5 votes
2 answers
524 views

What does a "handover" really mean in satellite communications?

I am working on simulating a satellite constellation and I keep coming across the term "handover". My general understanding is that a handover is when a ground station switches its connected ...
Luca Petrescu's user avatar
0 votes
2 answers
165 views

Which satellite is this very bright object? - part 2

A few weeks ago, I asked the same question about a bright object that I observed, initially thinking it wasn't Venus, but was told that it actually was Venus. Oops, fair enough. Here's another bright ...
Bigbio2002's user avatar
1 vote
0 answers
75 views

How to maintain minimum distance between satellites for duration of their orbits

I am working on a simulation in python that involves propagating hundreds of satellites over time. For simplicity, let's assume I have satellites at only a single inclination separated into multiple ...
Luca Petrescu's user avatar
0 votes
2 answers
156 views

Which satellite is this very bright object?

For the past few years, I've been spotting this "star" periodically in the night sky. Except it's not a star because it doesn't twinkle. And I don't think it's Venus, because I've observed ...
Bigbio2002's user avatar
2 votes
1 answer
148 views

How I can find the angular orbital velocity of satellite in circle orbit?

I know that we have the angular orbital velocity of a satellite in circle orbit as $w_0=\frac{v}{r}$, but I want another way to find out the angular orbital velocity of a satellite in the circle orbit....
u1997's user avatar
  • 321
1 vote
1 answer
274 views

What network does the Chandra X-ray Observatory satellite use to communicate with Earth while staying in its orbit?

From a NASA fun facts website How do satellites communicate?: How do satellites communicate? Satellites communicate by using radio waves to send signals to the antennas on the Earth. The antennas ...
Arunabh Bhattacharya's user avatar
1 vote
0 answers
64 views

How to access satellite & debris data categorised by intended purpose?

I'm working on an art project which requires satellite data (active, inactive, as well as debris), so I was on Space Track. Does the NORAD ID or some other field help retrieve information about the ...
sub511's user avatar
  • 11
1 vote
1 answer
203 views

how to procure a Launch vehicle for injecting a cubesat into LEO at LOW COST?

Me and my team are working on sending Cubesats just beyond the Karmann line. For which we obviously need a launch vehicle and would like to procure one or if possible build one. If any aerospace ...
Souvik Banerjee's user avatar
15 votes
4 answers
4k views

Do all artificial satellites have engines?

Novice question. A few days ago I watched a TV documentary about Virgin Orbit’s failed mission earlier this year to send satellites into orbit from Spaceport Cornwall. One of the satellites shown ...
Peter4075's user avatar
  • 253
4 votes
1 answer
358 views

If the largest spy satellites could take pictures, how detailed would they be?

This question is inspired by the NRO's Orion Satellites. These are surveillance satellites placed near geostationary altitude that measure radio emissions. Importantly, they have been described as the ...
A McKelvy's user avatar
  • 2,482
3 votes
0 answers
95 views

Difference Result of Numerical Satellite Propagator

Currently, I am trying to build a numerical propagator platform for satellite that accommodates for all kinds of perturbation. So, for validation purpose, I compare the result of my own program and ...
yusuf147's user avatar
4 votes
1 answer
584 views

How are starlink satellites deployed?

I'm not a science guy, but I did some research and I gathered that the rocket's upper stage spins before releasing the satellites stack in such a way that each satellite is given a slightly different ...
David's user avatar
  • 41
0 votes
0 answers
98 views

Sattelite position from TLE

How to get satellite position from TLE without any libraries? Because in Processing there is no libraries like SGP4.
Stanislav's user avatar
3 votes
0 answers
173 views

Predicting the ground path of a satellite's shadow

Given the orbital parameters of a satellite, how can I predict the ground path of its shadow? (The path from where it will appear to transit the Sun).
LostXOR's user avatar
  • 73
10 votes
2 answers
2k views

Is the full GPS constellation a Walker Delta constellation?

Through the extremely rigorous method of looking at the animation on Wikipedia's article about GPS, if this does indeed accurately represent GPS satellite orbits, then it looks like not all of the ...
NeutronStar's user avatar
  • 1,007
2 votes
0 answers
224 views

Maximum and minimum surface temperatures of a satellite in GEO?

Just as the title, how could one find out, or simply estimate the maximum and minimum likely surface temperatures of a satellite orbiting in GEO.
parry's user avatar
  • 21
6 votes
1 answer
193 views

How do engineers measure satellite drag, and how do they track it over time?

I’ve been slowly getting myself familiar with astrodynamics and understanding satellite orbits. I’m familiarizing myself with the concept of drag experienced by the satellites. I am curious about how ...
AGS's user avatar
  • 329
5 votes
1 answer
356 views

Given historical TLE’s, how do I determine the path/orbit/LLA of a satellite for a given historical period?

Im trying to get the historical Lon/Lat/Alt of a starlink satellite. I'm using TLE's from space-track and Skyfield to calculate latitude, longitude and altitude of satellites for a given date range. ...
AGS's user avatar
  • 329
1 vote
1 answer
210 views

How can I get a list of GNSS satellites in view for a given date/time

I need to generate a list of which satellites were in view at a given date/time. I'm specifically interested in the Galileo constellation of GNSS satellites, and I'd like to get a list of when each ...
Tim Long's user avatar
  • 113
2 votes
1 answer
185 views

How do I calculate the maximum northern and southern latitude a LEO satellite can image?

How do I calculate the maximum northern and southern latitude a LEO satellite can image? What parameters would I need?
pottie's user avatar
  • 21
4 votes
1 answer
134 views

What are the safe structural elements of spacecraft that could be used for on-orbit capture?

I know this depends on the general configuration of a spacecraft, but I am hoping to gain some insights. Assuming you have a servicer spacecraft with an abstracted capture mechanism (i.e., end ...
Ibrahima's user avatar
2 votes
1 answer
456 views

How much does it cost to build terrestrial ground station capable of controlling satellites orbiting the moon?

I'm noobie in space exploration and I want to carry out market research to find out how much it costs to build a terrestrial groundstation to control satellite missions that are in lunar orbit. Two ...
Ganimedes's user avatar
  • 163
5 votes
0 answers
81 views

Does space have the same salvage laws as maritime law? [duplicate]

With the international space station being decommissioned within the decade and other abandoned satellites what are the rules on independently saving these objects?
Joe's user avatar
  • 357
0 votes
1 answer
87 views

How to select the right magnetic torquers to desaturate a wheel?

I want to select actuators for a micro-satellite (around 40 kg) orbiting in LEO. I proceeded in calculating the maximum disturbance torques that affect my spacecraft and selecting proper reaction ...
martina p's user avatar
2 votes
1 answer
206 views

Why are some satellite solar arrays arranged in a zig-zag pattern

Some of the solar panel arrays I've seen on satellites are arranged in this weird zig-zag pattern. Even when they're fully deployed they still have this arrangement. Why? What's the benefit from doing ...
NuclearTaco's user avatar
8 votes
1 answer
1k views

Data on satellites and/or space junk

I am hoping to develop a program capable of predicting when a satellite will fly through the path of a telescope observation. The aim is to make it possible to block or mitigate the light from the ...
Pioneer_11's user avatar
10 votes
2 answers
4k views

What causes a satellite's orbit to decay?

Why do orbits of satellites orbiting at sufficient speed, far beyond the Earth's atmosphere, decay if there is no atmospheric drag? What drag is applied on the satellites at that altitude?
Niranjan's user avatar
  • 3,758
1 vote
1 answer
193 views

What is the purpose of geosynchronous communications satellites?

This question's sole answer Is it true, that commercial communications satellites account for the largest share of commercially used satellites? explains that: the vast majority of the satellites in ...
Ahmed Tawfik's user avatar
1 vote
1 answer
213 views

Distance between a satellite and an orbit

I would like to compute the distance between a satellite and a specified orbit. For instance, for an orbit at 897 km altitude, 0 degree eccentricity, 99 degree inclination, and RAAN of 0 degrees on ...
Troy Rockwood's user avatar
4 votes
1 answer
226 views

Does a space elevator ruin most satellite orbits?

A space elevator would offer a direct connection between the surface of the Earth and geosynchronous orbits. While the concept has several severe problems, according to my understanding of orbital ...
TheDyingOfLight's user avatar
1 vote
0 answers
50 views

Local space radiation measurement by 1U CubeSat

As far as I know, the general influx of ionizing radiation received by a CubeSat in LEO is mostly trapped protons and electrons, solar protons, galactic cosmic radiation, and neutrons. If the CubeSat ...
Golden_Hawk's user avatar
3 votes
1 answer
133 views

How can I calculate GPS satellite's Latitude and Longitude if I have the elevation, the azimuth, the XYZ coordinates of the ground station

How can I calculate a GPS satellite's latitude and longitude if the elevation, the azimuth, and the XYZ coordinates of the ground GPS station are provided? I have tried these questions: Computing GEO ...
TThoye's user avatar
  • 51
1 vote
1 answer
189 views

How can I calculate GPS satellite's Latitude and Longitude if I have the elevation and the azimuth

Please tell me how I can calculate a GPS satellite's latitude and longitude if I have the elevation and the azimuth angles. I am using a septentrio GPS receiver. Thanks
TThoye's user avatar
  • 51
5 votes
1 answer
182 views

Are satellites and probes dried before they start?

In vacuum, any liquid water on moisture in the materials of a satellite and probe will start to gas out. So are the materials on satellites and probes baked or dried by other menas before beeing sent ...
TrySCE2AUX's user avatar
  • 3,235
2 votes
2 answers
316 views

Using 2023 technology, how low can a satellite orbit earth?

With the technology available today, 01-01-2023, what is the lowest altitude at which we can orbit a satellite around earth?
Niranjan's user avatar
  • 3,758
8 votes
1 answer
175 views

What is the longest working cubesat?

For example VZLUSAT-1 is 5 years old and it is still working.
Saturn V's user avatar
  • 1,303
2 votes
2 answers
164 views

How would one obtain the longitude of satellite at the apogee?

I know that apogee longitude is a design point in Molniya orbits. Given the classical orbital elements, how can I find this value?
EserRose's user avatar
1 vote
1 answer
104 views

How do I make a attitude trajectory of a satellite so the attitude always points towards a point on earth given its current orbital position?

Let us say there is an antenna on earth and I have a satellite in an orbit how do I make the trajectory (not control, so body velocities of the satellite) to make it point toward the earth when it is ...
Hamzalihi's user avatar

1
2 3 4 5
18