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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 ...

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116 views

How accurate can a satellite's orbit be?

How precise can an artificial satellite be when it comes to following the exact orbit in relation to Earth or hitting the same point above Earth in orbit? Which orbit would be the most stable for this?...
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1answer
97 views

At what point when travelling faster and faster around the earth are you not gonna be falling back again (7km/s? 8km/s?)

My dad and I thought about a problem we had when discussing Earth's gravitational field. This wasnt the original question but I still would like to know the answer. So essentially my question is: ...
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1answer
76 views

Given a working satellite, would it be possible to build a homemade transmitter/receiver?

Given existing low-orbit and geo-synchronous satellites, would it be possible to build a device that could send a signal to a satellite and then have that signal received on another device? ...
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1answer
132 views

Satellite retrieval, fix and deploy possible remotely?

Is there any satellites that are designed to come back to Earth for repairs or upgrades and then be deployed again? Would there be any benefits to creating a capsule or inflatable heat shield to go on ...
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1answer
57 views

How to match orbital speeds of 2 or more satellites in different orbits?

Satellite ME is orbit around the Moon and Earth. Satellites E is around Earth. I understand the low orbit satellites orbit at higher speeds. Can Sat ME match the speed of any of Satellites E at any ...
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2answers
124 views

Can objects be deorbited by a satellite using a magnetic field?

Can a magnetic field be made around a satellite for a split second to gain or loose momentum from another satellite or debris with a few passes with a near-miss trajectories on larger debris? Could a ...
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2answers
96 views

Which Live satellites can the public view of earth? [closed]

Does anybody know if there is a LIVE satellite? Like a cross between Google Earth (zoom) and GOES 16 (LIVE)? So WE can see what's really going on around here? I want to see inside of the crater in ...
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1answer
78 views

How far has Artificial Intelligence (AI) came in satellites? [closed]

Are AIs being used in satellites? If yes, have they learned to adapt in satellites? In what way AI has benefited space exploration for us?
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8answers
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How would a long pole be transported to space?

Can a long pole or a set of poles be strapped to the out side of a rocket (like a bottle rocket)or on the nose as an external payload without interfering with the aerodynamics of the rocket? How would ...
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1answer
187 views

Why meteorological images have missing lines in the center?

I noticed strange blank line in the middle of completely valid images from VIIRS. . This looks like an error in the reception. Would have go unnoticed, unless the same blank line in the middle of ...
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1answer
294 views

What do you need to do legally to have an object in orbit?

Hello fellow explorers, I've been looking into amateur satellite and rocket launches. Now, I'm by no means saying I'm an expert and have all my plans ready for launch. However, hypothetically if I ...
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2answers
63 views

Can the deactivated satellites also be tracked through TLE?

TLE is used to track whether the satellites are in orbit or not. However, is it possible that a particular satellite is deactivated, decommissioned or deorbited yet its TLE is being updated regularly?
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Why would Kepler rotate towards Earth to transfer data?

A question from here: "Why would Kepler rotate towards Earth instead of having an antenna always directed to Earth"?
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2answers
2k views

Could a satellite survive for thousands of years in a high enough orbit? [duplicate]

Let's suppose that an advanced alien civilization explored the Earth hundreds of thousands of years ago and then left a satellite in a high orbit, say of a radius of 100.000 km. Could such a ...
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0answers
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Diamagnetic Orbit

This has nothing to do with electricity or Electrodynamic propulsion. I am asking can a flat surface of diamegetic material be made into a sail similar to a solar sail to displace and repel through ...
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2answers
2k views

Satellite launched, but in storage?

According to https://en.wikipedia.org/wiki/List_of_TDRS_satellites TDRS-C and TDRS-E were launched, but are "in storage". The citation (https://www.nasa.gov/directorates/heo/scan/services/networks/...
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2answers
236 views

What is a typical satellite solar panel mass?

Does anyone know a reliable source to find the mass of solar panels on satellites (in particular GEO satellites)? I know they will vary but I am struggling to even find one data point let alone a ...
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1answer
113 views

How to determine an orbit of a satellite for a collision detection?

I'm trying to validate an collision detector , and for that I'm starting from a pair of initial conditions for a satellite.After that I will use an RK method to integrate . How can I determine a pair ...
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1answer
623 views

How is a Russian satellite's behavior “very abnormal”?

The BBC has a news article saying: "Mystery Russian satellite's behaviour raises alarm in US". But the article doesn't say how or why the behavior is "abnormal". And the linked transcript of Remarks ...
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1answer
111 views

Relativistic effect on satellite motion

I am using GMAT to propagate satellite motion. At first, I excluded all the propagators besides harmonics(of second degree and 0th order, as shown in the picture): Here are the results(...
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2answers
46 views

Can the Sun's magnetic field be used to propel a solar satellite?

Can diamagnetic materials or a diamagnetic devise be used to propel using the magnetic field of the Sun in a solar polar magnetic assisted slingshot?
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1answer
42 views

Looking for info about commercial usage of satellites with examples [closed]

I'm doing research for an article and I'm looking for info about usage of satellites by commercial companies. For instance, usage of small satellites by insurance companies (imaging and etc.) or ...
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1answer
107 views

Design Software Recommendations

I'm currently working on "base stones" of future cubesat mission and I'm doing some research for designing or simulation of cubesats. Software that I found on google costs enormous price and I'm ...
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1answer
65 views

Launch cost of a small satellite

The satellite mass is 100 kg. The volume is 150 $dm^3$. The orbit is sun-synchronous (700km altitude) I'm doing a research to find the actual launch price of this satellite by ISRO, Arianespace, ...
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1answer
124 views

GMAT atmosphere

I am using GMAT to propagate satellite motion with Jacchia-Roberts atmosphere model. Here is a formula used from this model which is then used to estimate the variation in drag on a spacecraft due to ...
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0answers
66 views

Can I obtain the audio of president Eisenhowers message coming to me from a satellite circling in outer space?

I remember hearing a recording of this speech some time ago. However searching for it again has been difficult, which led me to believe that I probably heard a recreation from someone else. In this qz....
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1answer
122 views

Atmospheric drag effect

While propagating the satellite motion faced the strange effect. Without the atmosphere results (x,y,z coordinates in meters and ...
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3answers
4k views

What would happen if a satellite took a direct hit from a coronal mass ejection (CME)?

I was wondering what would happen if the average satellite were hit by an average CME. According to wikipedia the average velocity of a CME is 20 to 3,200 km/s. In addition to this it's super-heated, ...
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1answer
59 views

Why does MODIS have two channels covering a band of 3929nm to 3989nm?

While working my way through the technical specification of the MODIS sensor (Moderate-Resolution Imaging Spectroradiometer) in the Terra and Aqua missions, I noticed that band 21 and 22 seem to cover ...
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0answers
121 views

How to find Near Rectilinear Halo Orbits (NHROs)?

Looking all the good questions and answers in this site referent to CR3BP dynamics, periodic orbits, state transition matrices, etc. I wonder: what algorithm or steps do I have to follow to find the ...
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2answers
114 views

Is there a list of insured satellites?

SwissRe and other reinsurers state that 21 LEO satellites and 167 GEO satellites are insured, but I was wondering if more information was available on that. Also, are satellites fully insured? Or ...
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3answers
83 views

Number of spectral bands on radar satellites

I have learned that optical earth observing satellites have spectral bands often in groups (e.g. panchromatic, multi-spectral, SWIR, etc.). What about radar satellites such as RADARSAT-1? It seems it ...
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2answers
86 views

How does a spacecraft like Worldview-3 manage 29 different spectral bands? One giant filter wheel, or…?

@Jack's answer mentions 29 separate spectral bands for the Worldview-3 satellite, and that these are implemented using filters. Is there one giant 29+ position filter wheel incorporated into a single ...
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1answer
188 views

Spectral bands on an Earth-observing satellite

What does it mean when a satellite has these bands[1]: Panchromatic: 450-800 nm 8 Multispectral (red, red edge, coastal, blue, green, yellow, near-IR1 and near-IR2): 400 nm-1,040 nm 8 SWIR: 1,195 nm-...
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1answer
157 views

Did Echo 2 remain spherical without requiring gas pressure? If so, how is this known to be true?

Echo 1 and Echo 2 (Project Echo) were giant balloons inflated in space after being launched into Earth orbit, and used to study both the bouncing of radar, TV, and radio signals from one Earth station ...
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2answers
113 views

Can the TLE epoch be listed as in the future? How?

Can the epoch time of a TLE be in the future? Context: ISS TLE from Heavens Above 1 25544U 98067A 18193.60071450 .00016717 00000-0 10270-3 0 9013 2 25544 51.6401 252.0472 0003848 304.4303 ...
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3answers
238 views

Is a sun-blocking orbit possible?

Is it possible for an orbital "sun shade satellite" to have a geosynchronous equatorial orbit such that it is in an approximately straight line between the Sun and a fixed point on the Earth's ...
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1answer
111 views

Why are the Global Precipitation Measurement (GPM) satellite's solar panels angled so strangely?

The Global Precipitation Measurement Mission (or GPM) spacecraft (1, 2) has two solar array panels. They extend from opposite sides and one is tilted with respect to the other. This is a slightly ...
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1answer
115 views

Space stations is there 3 [closed]

Are there 3 space stations, one in the west low one in the south about 30 ' at about 10pmUK skies , and the Chinese coming over from SE th SW in day brake at 4am
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1answer
169 views

What satellites can I receive Images from with a radio?

Are there any satellites that I can receive image data streams with an SDR and antenna? I already know about NOAA 15, 18, 19 and METEOR - M 2. Are there any other radio satellites that I can access ...
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1answer
70 views

How do I prepare a preflight excel sheet template for satellite launch?

I would like to know if anybody has any advice regarding a preflight check that I am doing for a satellite. I would like to know if anybody has any experience regarding a standard excel sheet for all ...
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3answers
211 views

Do Kepler's laws of planetary motion apply also to satellites of the Earth?

Do Kepler's laws of planetary motion apply also to satellites in orbit around the Earth? I would assume yes, but I'm not sure why...?
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2answers
91 views

What is the official universal time system of Mars?

According to standing global treaty organizations specifications, 'What is the official universal time system of Mars?'
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1answer
64 views

Does this electronics box, or any other non-spacecraft released by astronauts have a TLE?

According to Space.com's 02-Feb-2018 article Cosmonauts Break Russian Spacewalk Record During Space Station Antenna Repair: The cosmonauts spent the day replacing an electronics box for a high-gain ...
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1answer
95 views

How many different countries operate a satellite?

Looking over the list of recent launches, I find communication satellites for countries who do not have their own space program. How many different countries operate a satellite as of 2018? Is that ...
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1answer
100 views

How does network routing work between satellites in constellations?

When it comes to large satellite networks, do each satellite work like routers in terrestrial networks, or is the 'routing' portion done on the earth side to pick correct satellites to jump to?
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2answers
126 views

Have weather satellites been sent to other planets?

Has an orbiting weather satellite, similar to those used around Earth, been sent to other planets to study their atmospheric weather? I am curious if a weather satellite is generic enough to serve ...
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1answer
442 views

How does a space probe differ from a satellite in terms of materials used and size?

Both of those space vehicles are meant to carry out different tasks. How are materials selected for both of them such that it benefits their task? And is size a debatable factor while building these ...
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1answer
183 views

How do I determine the ground-track period of a LEO satellite?

I was analyzing a LEO satellite with polar orbit for work purposes. I am relatively new to the field of Satellite orbits. I know that TLE can give information about the current & future orbits ...
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0answers
105 views

What was the design failure that Johns Hopkins Applied Physics Laboratory is alluding to?

I was looking through old saved urls and when an old Johns Hopkins Applied Physics Laboratory press release link didn't work, it sent me to the PageNotFound page, where I saw the image below. It ...