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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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SpaceX 2nd stage or tumbling satellite? WSW to NE over FL

Around 2040 EST We viewed an irregularly flashing object flying from WSW to NNE (roughly) from Jacksonville FL. Is the SpaceX 2nd stage still up there and if so, would it be tumbling and visible? Is ...
3
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1answer
108 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 ...
3
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1answer
97 views

Is photovoltaic efficiency defined and measured differently for space vs terrestrial applications?

Since the shape (as well as the integral) of the solar irradiance spectrum above the atmosphere is different than that below it, is the efficiency of photovoltaic solar panels defined and measured ...
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0answers
104 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 ...
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742 views

How to calculate the complete true anomaly motion in an elliptical orbit?

The true anomaly motion as I understand, is not constant in an elliptical orbit. The rate of change of true anomaly is not constant as in the case of circular orbits, in which case the true anomaly is ...
5
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0answers
84 views

Which robotic spacecrafts have autonomous operation capabilities?

I am searching for an overview of autonomous space robots integrating motion planning capabilities, such as a list of robots (past and present). So far, I have found these robots: Mars exploration ...
5
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0answers
365 views

Laplace Method for Orbit Estimation

I have a question about Laplace angle-only method for orbit determination where the line of sight vectors are being interpolated. I read somewhere that the method fails (due to a matrix being singular)...
4
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0answers
62 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 ...
4
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0answers
198 views

How has the angular velocity of Earth changed over the past 100 years?

What is the total change in the Earth's Angular Velocity over the past 100 years? I have read other posts that discuss how much mass has been lifted out of Earth's Atmosphere. I'm trying to get an ...
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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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0answers
87 views

Can a Solar Cell/Sail Powered Satellite orbit both the Moon and Earth rendezvously?

Outside the magnetosphere only using solar sails,panels and vains can the orbit of the satellite be maintained only using solar power? to include both the Moon and Earth? Can a satellite work like a ...
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0answers
60 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 ...
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54 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 ...
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0answers
54 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 ...
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0answers
184 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 ...
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0answers
84 views

How long is a satellite orbiting at 300 miles going to be visible from horizon to horizon?

Elon Musk has a plan for satellite internet that involves LEO and VLEO satellites. The question I have is how long would a satellite at these altitudes actually be within range before having to ...
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131 views

Has anyone seen an actual spectrum of a satellite made by an amateur photographer?

If you use a shallow wedge prism or very low dispersion diffraction grating (e.g. circa 100 lines/mm) front of a camera, you can photograph the spectra of stars with a modern DSLR camera with a fast, ...
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166 views

Was it a “Soviet military satellite not in any of the catalogs?”

I can't connect to the Tass news item directly http://tass.com/science/896683 but on a SETI page an item dated August 31, 2016 says: An article that quotes the Russian news agency TASS is ...
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0answers
131 views

Could electrodynamic tethers power long-term unmanned satellites around the Sun, Jupiter, or Saturn?

Assuming you have the budget to research electrodynamic tether powered unmanned satellites, and you had a cheap way of getting them in to earth low earth orbit, would they be able to use electricity ...
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54 views

Can a diamagnetic sail satellite work using Earth's Magnetosphere?

This has nothing to do with eletricity. I am asking can a flat surface of diamegetic similar to a solar sail material be used to displace and repel enough of the Earths magnetic field to maintain ...
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0answers
112 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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0answers
211 views

“Deep space” corrections in SGP4; how does it account for the Sun's and Moon's gravity?

The Simplified Perturbations model SGP4 is used to calculate Earth satellite state vectors (position and velocity) using standard ephemeris data encoded as TLEs (Two Line Elements). According to ...
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124 views

Satellite altitude variances in orbit

I understand that all satellites must have burn corrections to keep their orbits where they are needed. However my question is specifically about what those changes are in magnitude from the desired ...
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0answers
82 views

Are there any concrete plans to include chipsats for planetary suicide missions?

One of the potential uses for chipsats may be: Chipsats, which are smaller and cheaper still, are seen as disposable sensors that could be sent on suicide missions to explore hostile environments, ...
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780 views

How to calculate a Satellite position at a given time

I am trying to write a program to be able to "model" a Low Earth Orbit satellite's position at for a given time in the future. However I do not have a TLE for the desired satellite, I simply have a ...
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1k views

Why are space probes and satellites not destroyed by meteor showers such as the Perseid?

What are the mechanisms used to avoid destruction of space probes and satellites during meteor showers? Are they affected by them?
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114 views

Satellite Orbit-Sun Geometry of Sun synchronous Orbit

What is the difference in satellite orbit-sun geometry of Sun synchronous orbits of 6am local time , 9 am local time , 12 pm local time ?
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0answers
363 views

How are composite materials used in satellites and rovers?

I need to know how composite materials (CM) are used on satellites and rovers. Do you know which parts are made of CM? Please link to your references where possible.
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102 views

How to compute angular velocity of fluid ring for passive control?

Excuse me, friends. In paper , for passive control with eq.4, how to compute beta? beta is angular velocity of fluid in fluid. the satellite has initial angular velocity, but with filled fluid ring we ...
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208 views

attitude determination TRIAD - how are orbital reference frame vectors constructed?

I am trying to fully understand the TRIAD algorithm for attitude determination of a satellite. https://en.wikipedia.org/wiki/Triad_method So so far I know that the vectors $\vec{r}_1$ and $\vec{r}_2$...
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35 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'...
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63 views

How to determine an available planetary communication window using orbital mechanics?

For class I have an orbit around Mars at an inclination of 63.4 deg and a base site of 55 deg North and was wondering how to work out the communication window, using orbital mechanics. Orbital ...
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81 views

Elapse Time Of Satellite's Sunrise and Sunset

What is the formula for calculating the elapsed time to sunrise and sunset of a satellite. Example: Satellite to sunrise +00:01:00 Satellite to sunset -00:45:21