Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange
Join us in building a kind, collaborative learning community via our updated Code of Conduct.

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 ...

4
votes
1answer
61 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 ...
13
votes
1answer
444 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 ...
5
votes
1answer
90 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(...
1
vote
2answers
40 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?
2
votes
1answer
40 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 ...
0
votes
1answer
55 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 ...
2
votes
1answer
53 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, ...
5
votes
1answer
116 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 ...
3
votes
0answers
64 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....
1
vote
1answer
110 views

Atmospheric drag effect

While propagating the satellite motion faced the strange effect. Without the atmosphere results (x,y,z coordinates in meters and ...
23
votes
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, ...
4
votes
1answer
57 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 ...
1
vote
0answers
96 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 ...
3
votes
2answers
109 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 ...
2
votes
3answers
72 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 ...
2
votes
2answers
80 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 ...
5
votes
1answer
163 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-...
5
votes
1answer
117 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 ...
2
votes
2answers
90 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 ...
5
votes
3answers
221 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 ...
4
votes
1answer
106 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 ...
-2
votes
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
14
votes
0answers
99 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 ...
0
votes
1answer
66 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 ...
1
vote
3answers
139 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...?
3
votes
2answers
86 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?'
2
votes
1answer
58 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 ...
4
votes
1answer
78 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 ...
6
votes
1answer
98 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?
5
votes
2answers
124 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 ...
2
votes
0answers
84 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 ...
10
votes
1answer
408 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 ...
4
votes
1answer
89 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 ...
5
votes
0answers
98 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 ...
5
votes
1answer
199 views

Why the spiral pattern on this satellite?

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 ...
2
votes
1answer
68 views

Data from Cubesat as web API

I’m doing some research for possible cubesat mission and I spent days on the internet and in books trying to find a simple answer to my dumb question. I’m completely new in this field so I’m not sure ...
28
votes
1answer
6k views

What is the farthest artificial satellite in orbit in our solar system?

When did we send the farthest satellite and what is its role and name ?
17
votes
1answer
2k views

What is the purpose of the satellite that China is putting in lunar orbit?

I was just reading an article about the satellite that China is putting in Lunar orbit as phase one for their exploration of the far side of the Moon. Is this satellite just to be used as a signal ...
1
vote
1answer
166 views

Can orbital maneuvers be performed by a solar sail to correct eccentricity?

This unique model would spend very little time in Earth's shadow and eccentricity correction is performed on every pass. Can the angle of the hard flat solar sail or one big solar vane maintain an ...
1
vote
2answers
118 views

Can modified solar sail use Earth's atmosphere to manuver an eccentric orbit?

A solar sail power satellite used create thrust as a while in orbit around Earth will gain eccentricity because it can only propel from on side of the Earth. When the orbit will become eccentric ...
4
votes
2answers
164 views

Which ISRO satellite was built in 24 hours?

In the video New ISRO Chief Rocket Man Sivan K, A Farmer's Son, Takes On SpaceX after about 08:33 the interviewer asks ISRO's chairperson Kailasavadivoo Sivan about ...
0
votes
1answer
114 views

What orbit is this?

Can this orbit exist around the Earth and the Moon if the weight and speed of the satellite is ideal? I have added a picture below with the orbit drawn.
10
votes
3answers
2k views

What satellite has the highest orbit around the Earth?

What is the furthest Earth orbiting satellite? What is its speed and purpose? What is the slowest possible stable orbit?
24
votes
4answers
4k views

Is there a satellite that tracks other satellites?

Is there a satellite that tracks other satellites, or is tracking always done from ground stations? Ground stations can only see a small part of the sky, so a network of stations would be needed. A ...
11
votes
6answers
2k views

Can a satellite work like a radiometer?

Like a Crookes Radiometer, could a satellite have a stiff vain to maneuver? With a white side to let light pass and the black side capture light radiation be enough provide radiation pressure to keep ...
3
votes
1answer
498 views

Does the size of a satellite have an effect on orbit?

I understand that lighter satellites orbits decay faster. There is 2 satellites that weigh the same but 1 is huge and the other tiny in comparison. Would the size of the satellite make a difference on ...
5
votes
1answer
153 views

Can you operate a satellite in the disposal “graveyard” region

The NASA safety standards allocate the region between 2,500km to 18,833km altitude for the disposal of LEO satellites. Most satellites, as far as I understand, will either operate in LEO (so well ...
13
votes
6answers
1k views

Why do satellites appear to move faster when overhead and slower closer to the horizon?

I've been watching man-made satellites with the naked eye using the "Heavens Above" mobile app. They seem to move incredibly slowly near the horizon, but when they go overhead, they look like they ...
6
votes
2answers
314 views

Have there been any probes launched that were actually clusters of probes?

I was wondering if there were any space probe systems that were actually launched as part of a larger satellite bus. As in, one rocket launch from earth releases 6 different satellites on a singular ...
29
votes
4answers
4k views

What would be the first noticeable consequences to the general public of widespread satellite destruction?

What would most likely be the first thing I, as an average citizen of a developed nation, notice, if within a matter of hours, all major commercial and government satellites were to be destroyed in a ...