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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What would be the most appropriate shape for a satellite going to mars?

What kind of shape would be best for a satellite studying mars?
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Future trends in Earth Observation and Communications from VLEO; are there any?

Question: In order to better understand the wider market need and uses for Very Low Earth Orbit (VLEO)-enabling technologies, I'd like to ask about future trends in Earth observation imagery and ...
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Satellites below perigee on Stuff in Space website

A friend of mine noticed that many satellites on Stuff in Space website can reach an altitude lower than their declared perigee, as you can see in the following screenshot: We observed these ...
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Can we determine the position of an artificial satellite using Kepler's parameters?

I have read that an orbit is defined by Kepler's parameters, so is it possible to determine an exact position of an artificial satellite using those parameters? Forgive me if this is a redundant ...
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Is there an archive of the Satellite Times magazine from the mid-late 90s?

More of an misc. question. I am looking for the "Satellite Times" magazine which seems like it was in print in the mid-late 1990s. Part of the articles published there could be found at ...
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Ephemeris output from Skyfield

Is it possible to use Skyfield to propagate a TLE forwards and then output its ephemeris, rather than geometric x,y,z at some point in the future? I've worked through the examples in the API and may ...
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Why are minimum three artificial satellites required for radio-communication all around the Earth?

Artificial satellites orbiting the Earth have important applications for radio-communication around it. To avoid the blockage of radio-communication around the Earth, multiple satellites can be ...
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Why are Hubble's magnetorquers angled?

Watching a video on how Hubble attitude control works I saw one portion on magnetorquers. It has four for redundancy but they are angled in a way that looks awkward from a packaging viewpoint, so what ...
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How do I find my coordinates using x, y and z variables and trilateration?

For a school project, I was really interested in finding my own location using information from satellites, by using trilateration (so basically do what GPS are doing but by myself and with some math)....
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How do I find my coordinates (on Earth) using satellite information? [duplicate]

I was really interested in finding my own location using information from satellites, by using trilateration (so basically do what GPS are doing but by myself and with some math). I don't really know ...
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Why do we have so many inactive satellites over mars?

I was reading this question and wondered why there were so many that were inactive. Considering the cost to build/launch/ship them, and that they are mostly powered by solar energy, why would they go ...
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Why does ESA's TGO satellite not permanently serve as relay for Perseverance?

This question is about the orbital parameters of ESA's ExoMars Trace Gas Orbiter (TGO), so I am optimisitic that it belongs on astronomy SE. More specifically, it is about the orbital geometry of TGO ...
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How much power do radiation-based engines produce

I heard that the Voyager satellites used a radioactive source to power the computer and sensor systems. How much power can this technique produce nowadays? Could it power, say, a fighting robot? ...
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Why do AST SpaceMobile satellites have antennas much larger than Starlink, whereas they both aim at providing network coverage anywhere on earth?

I read on cnbc.com (mirror): AST drew the attention of NASA in October, when the U.S. space agency commented on the company’s FCC proposal and said AST’s “extremely large satellites” would create “an ...
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Understanding the paper “Determination of Satellite Orbital Elements by Means of On-Board GPS Receiver and Its Verification” by Yoshiwo Okamoto et. al

I have been assigned with implementing the algorithm proposed in the paper "Determination of Satellite Orbital Elements by Means of On-Board GPS Receiver and Its Verification" by Yoshiwo ...
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Setting up orbit propagation in Orekit

Please forgive my ignorance, I'm new to orbital dynamics. I am using Orekit [https://www.orekit.org/] for orbital propagation in order to determine rise and set times for a MEO satellite, and am ...
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How is satellite's footprint/coverage calculated?

I was using Orbitron - Satellite Tracking software the other day and I saw that clicking on any of the satellites, you will see their footprint (they are usually not-ideal circles, usually ellipses), ...
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What if we launched rockets from space using the slingshot method and centripetal force? Would that be possible?

Would we have to build a orbiting launch station that uses centripetal force to launch the rockets? Or a station that freely floats through space not in a planets orbit? Would something like this ...
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Timeline of record multiple satellite launches

The Transporter 1 mission has placed 143 satellites into low orbit in one go. The previous record was held by the Indian ISRO PSLV C37 mission with 104 satellites in 2017. Where can I find a complete ...
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What is the first time that two satellites were launched together as the same payload?

Below I've assembled some research into the question of which launch is actually the first to carry two satellites into orbit, but so far I think the results are inconclusive. So despite there being ...
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Orbital launches

In the 1950s, many US rockets were capable of reaching the lower limit of LEO altitude. Despite this, no one thought of making the launch vehicle / its payload orbit around earth, even for one ...
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First satellite dispenser?

A rocket upper stage, sometimes called kick stage, is the last stage of a rocket and it is used to deploy satellites in orbit. A space tug is a spacecraft released from the upper stage and it is used ...
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What ever happened to 6Q0B44E - potentially the “artificial satellite (with) the farthest orbit around the Earth”?

I just started flipping through Handbook of Space Engineering Archaeology, and Heritage Space Hardware Ann Darrin & Beth L. O'Leary, Eds. 2009, CRC Press, Boca Raton, 1035 pages It looks as though ...
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Satellites Orbital Parameters

I want to access satellites' orbital parameters like inclination, right ascension of ascending node and argument of perigee. Unfortunately, I haven't been able to find this information. Is there a ...
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Was the nature of Explorer 3's orbit intentional?

A number of early spacecraft launched into orbits other than the intended one. For example, Explorer 1's apogee of 2550 km was much higher than intended, and Vostok 1's was too high to decay in the ...
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Would 2 areostationary satellites around Mars, over opposite longitudes, allow constant communication with rovers?

I've heard that rovers on the surface of Mars can only communicate with and send data to orbiters for only 8 minutes at a time. Wouldn't two areostationary_orbit satellites orbiting opposite to each ...
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Is SOHO a satellite of the Sun or of the Earth?

Those artificial satellites placed in the Lagrange points, like SOHO, are they orbiting the Sun or the Earth? Or is it a satellite of both?
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Most slow artificial satellite in circular Earth orbit? [closed]

What is or was the Earth satellite with a relatively circular orbit that takes longest to make a single orbit? Say the ratio between the diameters is not greater than 1.5 (big/small)
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What is the altitude of a surface-synchronous orbit around the Moon?

A geostationary equatorial orbit (GEO) is a circular geosynchronous orbit in the plane of the Earth's equator with a radius of approximately 42,164 km (26,199 mi) (measured from the center of the ...
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Longest duration of a Moon orbiter?

From all the spacecraft that orbit or orbited the Moon, which one lasted the longest in lunar orbit? By defunct spacecraft includes.
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Lowest orbit of Mars orbiters?

There were a lot of orbiters sent to Mars already. From all the Mars orbiters which one had the lowest altitude?
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What is the lowest possible stable Mars orbit?

Due to atmospheric drag, the lowest altitude above the Earth at which an object in a circular orbit can complete at least one full revolution without propulsion is approximately 150 km (93 mi) while ...
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Using electrodynamic tethers for countering precession?

One of the potential uses of electrodynamic tethers for satellites is generating thrust without needing to expend reaction mass. Could this potentially be used to counteract precession, allowing ...
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What is the fastest satellite in Earth orbit?

A satellite in Earth orbit needs some 7.8 km/s as orbital velocity. From all the satellites in Earth orbit ever launched which one has or had the highest speed?
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How did the Space telescopes lose their coolant helium?

How did the Planck satellite lose its helium? Spitzer, Herschel had the same problem. How was it consumed? How come other satellites, like Hubble, don't have this problem? And basic logic says that ...
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Local observer coordinate system at satellite panel (LVLH coordinate system)

In skyfield I want to calculate alt-az distance from one reference satellite to next (for antenna pointing simulation). My current workaround is to create the reference observer at sat1 height and ...
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1answer
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Tutorial for orbits from TLE data

I've been looking for a new hobby, and have been reading some about satellite tracking. I was wondering if there was a good tutorial that walks through how to use TLE data. So far I have found ...
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When B is directly below A, as shown, what's B’s velocity (in vector notation) relative to A?

Spacecraft A and B are in coplanar circular orbits around the Earth. The orbital radii are as shown in the figure. (Not looking to use C-W equation. Just the equation describing relative velocity ...
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What are the shortest orbital periods used for their repeat ground track properties?

The most well-known repeat ground track orbits are geostationary and geosynchronous orbits, having orbital periods in a 1:1 ratio with the revolution of the Earth. Faster repeat ground track orbits ...
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Is it possible to predict if an orbiting satellite will pass over a given point on Earth after n periods?

I'm learning basic astrodynamics, and I have a question that I cannot find on the Internet (maybe I'm not looking hard enough). My question is, is there a way to predict how many periods would a ...
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What's the current state of Venus orbital infrastructure?

As per this Wikipedia article there have been a total of 5 orbiters successfully deployed to Venus: Venera-15 Venera-16 Magellan Venus Express Akatsuki Of which only the Akatsuki seems to be ...
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What's the current state of Mars orbital infrastructure?

As per this Wikipedia article Mars currently has 6 operational artificial satellites: 2001 Mars Odyssey Mars Express Mars Reconnaissance Orbiter Mars Orbiter Mission Mars Atmosphere and Volatile ...
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Number of satellites launched per year?

How many satellites were launched every year? Similar question Number of satellites launched by decade? Resources for number of orbiting and active satellites by year?
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Number of satellites launched by decade?

How many satellites were launched each decade? Including satellites of Mars Moon Venus Sun etc Similar question Number of satellites launched per year? Most busy times in space launches by decade?
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Most expensive satellites of 2010s?

Which were the most expensive Earth satellites in the 2010s? Say first 3 or 5. Zuma satellite (lost) was $3.5 billion, was any other satellite more expensive? Excepting the Space Shuttle which is a ...
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How to determine the delta V required in order for the satellite at pt. A to hit the earth at pt. B?

I'm confused about how would I go about obtaining delta-v in this case. I'm aware of orbital transfers such as bi-elliptical but that is not the answer to this. Kindly help
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What would be the influence of nearby planets on a Dyson sphere or Dyson swarm?

Considering orbital mechanics, I would like to ask what would be the effect of nearby planets such as the Earth or Jupiter on a Dyson sphere. A Dyson sphere is not realistic because of the tremendous ...
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Highest DC voltage ever intentionally produced in space?

Comments on the page Maximum grid voltage of ion thruster got me wondering; what is the highest DC voltage ever intentionally produced by a spacecraft in space? Photomultiplier tubes and micro-channel ...
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Satellite inclination, 3D scanning of earth's surface

Has any attempt been made to change the "plane" of the orbit (not altitude) of a satellite, across earth's diameter, continuously in small steps, from pole to pole for a satellite with zero ...
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Could pressurized steam be an effective propellant for satellites?

If you had a small pressure vessel and a matte black external boiler that could utilize the heat of the sun, would pressurized steam be feasible for maneuvering a small satellite?

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