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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 be confused with non-orbited man-made objects in space, that are usually referred to as "probes", or simply "spacecraft".

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2answers
112 views

Can bad satellites be pulled out of orbit with an Orbital Mass Accelerator? [closed]

Could an Orbital Mass Accelerator OMA be used to knock other satellites out of orbit? Leaping from satellite to satellite using a magnetic field to accelerate some useless satellites and decelerate ...
4
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0answers
74 views

Satellite Laser Ranging - Relativistic Range Correction

I am not sure whether I have understood the relativistic range correction which plays an important role for precise Satellite Laser Ranging (SLR) correctly. The basic observation equations for this ...
6
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1answer
132 views

Why is Nodal precession affected by the rotational period of the planet?

The $J_2$ term in Nodal Precession equation has the rotational period of the planet. I understand that the oblateness of the sphere with an equatorial bulge induces a torque on the orbit of a ...
1
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1answer
253 views

What is the cost of the propulsion system and thrusters as a % of the total satellite?

Small (nano) satellites and cubesats are between \$100k and \$500k. What percentage of the total is the cost of the propulsion system?
0
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0answers
91 views

How can a company or a person reserve an orbit for a satellite? [duplicate]

How can a company reserve an orbit for a communication satellite? And are there any companies which provide an orbit leasing service?
5
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1answer
721 views

Stripe of high def imagery on Google Moon

When messing around with Google Earth's Moon and Mars features I noticed that the lunar imagery used is mostly homogeneous except for a large stripe across its' surface. See Image: This "stripe" also ...
1
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1answer
100 views

How does DigitalGlobe plan to re-image a specific area “as frequently as every 20 to 30 minutes”?

The Spaceflight Now article DigitalGlobe books two launches with SpaceX for Earth-imaging fleet goes beyond describing the two launches to talk about DigitalGlobe's future plans. Fitted with ...
1
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0answers
54 views

Who approves satellite launches, and what prevents anyone from just launching one from a legal standpoint? [duplicate]

What regulatory process does one have to go through to get a satellite launch approved, and what, if anything, keeps satellites from different countries from colliding with each other?
2
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3answers
306 views

How to calculate cone angle between two satellites given their look angles?

I have the azimuth, elevation and distance of 2 satellites relative to a ground station, defined by latitude and longitude, as I've discussed in my previous question. I'm using the satellites' TLEs ...
3
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1answer
546 views

How to calculate the angle between the satellite and ground station?

I have the latitude/longitude/altitude of a satellite and a ground station. Also, I have their Cartesian coordinates in Earth-centered-Earth-fixed frame (ECEF). How to calculate the elevation angle ...
0
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2answers
243 views

If we make a “Ring around the earth” in orbit - a wire ring in orbit - could we use it generate electricity?

I envision a conductive wire that is extruded out of a satellite as it completes it orbit, and then goes past it's start point a bit before stopping the extrusion. Then the satellite is sent to grab ...
2
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2answers
323 views

Could a satellite levitate above the magenetic fields of Earth?

Like the toy the base of the levitation could the Earth be the base and the space station the levitron? https://earthscience.stackexchange.com/questions/13854/where-on-earth-is-the-magnetic-field-...
5
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1answer
266 views

Cost Estimation of Satellite propulsion systems

As part of my research project, i am evaluating various satellite propulsion systems. Are there any databases or forums where the ROM cost of a Satellite propulsion system is listed. A few new space ...
12
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2answers
2k views

Earthing system in space?

On Earth, we have a good reason to deploy electric devices with an "Earthing system": this helps to avoid dangerous leak currents on surfaces. Now how is this solved on a spacecraft?
0
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2answers
239 views

How do Tom & Jerry (CANYVAL-X) measure their alignment with a distance source accurately?

According to the Spaceflight 101 article CANYVAL-X – Tom & Jerry: CANYVAL-X is a two-satellite CubeSat mission aiming to demonstrate a Vision Alignment System that could enable a virtual ...
3
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1answer
124 views

Was the Orbit Pavilion triggered by real communications events?

The October 2016 NASA JPL news article Art Turns Public Eyes (and Ears) Toward Space describes an artistic interpretation of the communications between a number of NASA Earth satellites and ground ...
2
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0answers
80 views

How can I plot a precessing orbital plane of an artificial satellite on a polar plot from a TLE in Python?

How can I plot the orbital plane of an artificial satellite on a polar plot from a TLE in Python? Very new to all of this. As I understand it I need to extract TLE's from Space-track.org. Then use ...
6
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2answers
2k views

How can I plot a satellite's orbit in 3D from a TLE using Python and Skyfield?

I have obtained a Two Line Element (TLE) of a satellite in Earth orbit from Celestrak at https://www.celestrak.com/NORAD/elements/ and I would like to use it to calculate an orbit. How can I ...
8
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3answers
2k views

Do satellite uplink/downlink signals spread or leak into space?

Satellite communication generally involves three types of nodes: the ground station (also known as teleport), the satellite in geosynchronous orbit, and the satellite receiver/transceiver. I am ...
2
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1answer
134 views

Why is the cold of space a danger to satellites?

Recently, I have been learning about satellites present in space, and one of the discussions was the danger of the variance of temperatures, as space can be both incredibly hot and cold. I understand ...
2
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0answers
58 views

Can the L1 sunshade idea for climate control be adapted to work in LEO?

There have been a few papers written on ways to put objects at the Earth-Sun L1 point to shade the Earth enough to counter-act global warming. There is a Wikipedia page about it, this paper called ...
2
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1answer
109 views

How can you calculate the minimal cone angle between two satellites to prevent interference?

I have a model of 2 ground stations (G1 and G2) and 2 LEO satellites (S1 and S2). G1 and G2 are located close to each other. S1 transmits data to G1 and S2 transmits to G2 with almost the same ...
3
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2answers
339 views

How are old satellites removed from orbit? [duplicate]

Once the satellite is nonfunctional how are they removed from orbit?
6
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2answers
644 views

The Orbital Mass Accelerator Engine Theory

Can 2 satellites equal in weight traveling on the same orbital path in the opposite directions intersect and propel each other to gain altitude in orbit? Can orbital perturbation be negated during ...
1
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1answer
186 views

Satellite Launch Direction

Most rockets hoping to achieve earth orbit are launched West -> East and from near the equator to gain maximum advantage from the spin of the Earth. I know the launches often also are deliberately ...
2
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1answer
369 views

Cubesat 6U and 12U maximum weight

What is the maximum weight for 6U and 12U cubesat in kg.? Please, give links/references. In this link it's stated that, 6U is 12kg, 12U is 24kg. But 1U is 1.33 kg, how is it possible?
0
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1answer
189 views

How long would a satellite fly on a sun-synchronous 600km orbit?

How long would it take for a 12U cubesat on a circular polar orbit with altitude 600 km to fall down to 500 km? Please, add references/calculations to your answer.
3
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1answer
256 views

How do they decide on the type of orbit to launch a satellite into?

I know there are many different satellites, but why would they put a satalite in a geosynchronous orbit vs a low earth orbit? What are the benefits or disadvantages of each?
1
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1answer
346 views

Why do we accept elliptical orbits for satellites?

A ballistic launch will produce an elliptical orbit, sure. Any satellite with mass will have an elliptical orbit, ultimately, due to torque. But, with current tech level, it seems like we can orbit ...
3
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1answer
137 views

Satellite Positions in ICRF

For a project I need precise satellite positions in ICRF. After doing some searching I was not able to determine any online resource which provides such time series. In detail I am interested in the ...
2
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0answers
60 views

Finding reference quaternion of a satellite in orbit

How can i find the reference quaternion of a satellite after it has detumbled? I need the quaternion to be able to successfully actuate my payload, which in this case will be a hyperspectral imaging ...
9
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2answers
3k views

Do any planets other than Earth have artificial satellites?

Space probes have been sent to fly by or temporarily orbit other planets. Have any artificial satellites been sent to permanently orbit another planet and record data? "Permanent" as in purpose of ...
1
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1answer
58 views

Applying secondary orbital perturbation effects

I read about secondary effects which influence on orbit propagation like solar radiation, moon, etc. (https://en.wikipedia.org/wiki/Orbit_modeling). First I calculate position vector Rpqw to object (...
8
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1answer
243 views

Has there been any satellites that used an 'upside-down' Molniya orbit?

Have there been any satellites that used an orbit similar to what Russia uses, but for the southern hemisphere? Specifically to service South America and Australia/Oceania?
4
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2answers
155 views

Where is Vela 1A? Is there any information what its orbit would be like now?

While looking for the Earth satellites at the highest orbit I found mention of the Vela 1A. Wikipedia's High Earth Orbit page indicates a perigee of 101,925km and apogee of 116,528km, however ...
29
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4answers
6k views

Is it possible to track an object as small as the Tesla Roadster around the Solar System

I have heard that we will soon lose track of the Tesla Roadster launched with the Falcon Heavy test launch. Yet, we know where Voyager is out beyond the Solar System and we followed other satellites ...
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2answers
184 views

Is docking satelites an option?

If we dock satellites together we can then have big satellite stations on different orbits that will be serviceable. Is this possible, and what are some implications of doing so? For example, can ...
12
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1answer
617 views

Musk's Roadster = Russell's Teapot? [closed]

Summary: Assuming no foreknowledge of its existence, can Elon Musk's Tesla Roadster be detected and categorised from Earth? Bertrand Russell argued the following, an argument that is now known as ...
2
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0answers
275 views

Clarify algorithm finding satellite ground track and orbit position

I try to plot satellite ground track. I found lots of formulas but hardly find algorithm which describe how to uses them one-by-one and step-by-step. As I understand the algorithm will be: 1) Get ...
1
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0answers
91 views

What prevents a satellite from tumbling? [duplicate]

I wonder how satellites manage to always face earth with the same side. I know they have small rocket motors for station keeping, but in the absence of any athmosphere, they would have to perfectloy ...
3
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1answer
91 views

How satellites handle obstacles for short or long term missions

Do scientist consider small asteroid/stones/junk in space while sending satellites to orbit or for long range missions like for Mars? If yes, then how can they identify the trajectory and prepare ...
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0answers
53 views

How can I import a binary file in STK?

I have a binary file which contains satellite data. I want to import this binary file in STK so that I can create attitude/ephemeris file in STK. I could't find proper documentation about this on AGI'...
0
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2answers
90 views

Tradeoffs using a battery/motor/gyro versus tangential thrusters to spin a spherical shell in space?

Using the Humanity Star (see this answer for example for background/context), consider two possibilities for spinning a small spherical shell at a low rate, say perhaps in the neighborhood of 2 to 10 ...
3
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2answers
248 views

Does using electric propulsion increase the lifetime of satellites?

Lifetime of satellites is affected by orbital decay. By using electric propulsion which is more efficient than chemical propulsion, this means that we got more fuel correct the satellite from orbital ...
2
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1answer
400 views

It's been over two weeks now, will the real Humanity Star please stand up?

edit: This must be some kind of record! (cf. ISRO's PSLV-C37 with 104 satellites - after 56 hours only six TLEs, which factor is greatest challenge? This time its only six total!) At the end of ...
3
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1answer
1k views

Why would Humanity Star not be visible from North America (USA?) until March?

A quote near the end of the BBC's article 'Disco ball' put into space from NZ says: Jonathan McDowell, a satellite-tracker and astronomer at the Harvard-Smithsonian Center for Astrophysics, ...
6
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2answers
592 views

Does Humanity Star have non-reflective triangular panels? If so, what are their characteristics?

Rocket Lab has successfully launched a rocket from New Zealand and placed several objects in orbit, see here for example. One payload is New Zealand's first satellite the Humanity Star, a reflective ...
6
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1answer
140 views

How was it difficult for the PSLV to launch a record of 104 satellites?

Last year, ISRO launched 104 satellites successfully into orbit. People praised it as an 'astounding achievement'. Besides a more complicated-than-usual satellite separation, what truly was ...
19
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2answers
3k views

Suppose Zuma wasn't “lost” — what would it take to detect it?

Being a secret government launch, there has been speculation maybe the Zuma satellite wasn't lost, and claims to the contrary are a ruse to throw off parties who'd like to track it. There is possible ...
4
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1answer
665 views

Can image-stacking allow this 0.25 m satellite telescope achieve 0.65m resolution?

The BBC News item UK satellite to make movies from space describes this newly deployed satellite: caption: Artwork: Manufacturer SSTL calls it Carbonite-2, but Earth-i refers to the satellite as ...