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

Questions tagged [geostationary]

Questions about orbits whose position in the sky remains the same for a stationary observer on the primary body.

7
votes
0answers
72 views

How are co-located satellites positioned relative to each other?

I'm trying to learn about co-located GEO satellites. When I first heard about them, coming from a planetary orbital mechanics background, the first thing I pictured was based on the epicyclic ...
3
votes
1answer
84 views

Meteosat 11 big deboost/reboost

Before Feb 2018, the meteosat 11 (MSG-4) were periodically reboosted approximately every 85 days: EDIT: added the orbital inclination plot to show the clearly visible variation to both semi-major ...
2
votes
1answer
327 views

Is two-way communication really required to use BeiDou GNSS?

The BBC's How China's GPS 'rival' Beidou is plotting to go global mentions a scenario where end-users can send signals to other Earth locations using BeiDou and later says: But despite its ...
3
votes
2answers
292 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 ...
1
vote
2answers
84 views

How did Syncom-3 achieve eight stages of frequency doubling? I only see seven in the block diagram

@BlueCoder's nice answer to Syncom-3 was the first geostationary satellite. Anyone know of a description of the onboard electronics? mentions that the the master oscillator was doubled eight times to ...
2
votes
1answer
50 views

Syncom-3 was the first geostationary satellite. Anyone know of a description of the onboard electronics?

I am interested in any description of the electronics on Syncom-3, the first geostationary satellite. I've been able to find quite a bit of general information. There was a pair of 2 Watt TWTs and ...
3
votes
1answer
261 views

How to calculate GEO (geostationary) satellite eclipse time?

The positions of satellites in geostationary orbits can be characterized by their longitude, the longitude of a point on Earth's equator that is nadir to the spacecraft. Satellites in GEO will ...
13
votes
6answers
5k views

Dangle a cable down to earth - fundamental Physics question

If I had the material that had the tensile strength, would it be possible to have it dangle from the lowest most practically possible geostationary object down into the atmosphere? Would it not ...
3
votes
1answer
71 views

How to calculate thruster force calculation during maneuvers

I'm working in a satellite operator company, operating a GEO cubic shaped satellite, with 16 chemical thrusters and 3 reaction wheel for attitude control maneuvering. We have vendor provided flight ...
2
votes
1answer
47 views

What GEO relay satellite will the ISS use for end-to-end optical communication with a ground station?

This LEMNOS page on NASA's Explorations and Space Communications site says: The Integrated Laser Communication Relay Demonstration (LCRD) Low-Earth Orbit (LEO) User Modem and Amplifier Terminal (...
11
votes
2answers
2k views

Are commercial communications satellites in GEO being constantly monitored by telescopes?

I was trying to look up GOES-17 in Spaceflight101 but got sidetracked in the search result and ended up reading this thread about AMC-9, which links to the YouTube video Rough cut video of AMC-9 ...
2
votes
1answer
81 views

What are these two very large, round panels on opposite sides of AngoSat-1?

The Spaceflight101 article AngoSat-1 Satellite Overview Shows several images of the large communication satellite designed for GEO. Two color photos show that the spacectraft has two large (roughly ...
2
votes
1answer
86 views

What is the Evolved Expendable Launch Vehicle (EELV) Secondary Payload Adapter (ESPA) Augmented Geosynchronous Laboratory Experiment satellite?

The Spaceflight Now article Multi-satellite payload hoisted into high-altitude orbit by Atlas 5 rocket includes the passage: The lower passenger is the Evolved Expendable Launch Vehicle (EELV) ...
0
votes
2answers
216 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 ...
0
votes
1answer
34 views

can a raspberry type powered controller device be successful in obtaining a geostationary orbit? [duplicate]

I am currently looking into the possibility of very tiny automated drone transportation. I hope to prove viability by testing using orbital mechanics experiments. Achieving geostationary orbit and ...
1
vote
0answers
128 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 ...
3
votes
2answers
429 views

Determine orbit type from TLE

I was wondering if, and how, one can tell from the values in a TLE whether an orbit is LEO, MEO, HEO, or GEO. I'd like to do this in code eventually, so any formulas or threshold values would be much ...
3
votes
1answer
120 views

How long does the upper stage stay in orbit if the payload is released on GTO?

A launcher upper stage may not stay in orbit for long, as it does not need to go as high as the payload and thus travel at an altitude at which although it is thin, the atmosphere is still dense ...
3
votes
2answers
815 views

Computing GEO satellite's longitude from elevation/azimuth from a given latitude/longitude?

This question is a bit of a mix between satellite knowledge and math. Suppose I have the "look angles" (elevation and azimuth) for an otherwise unidentified geostationary satellite, and I would like ...
8
votes
2answers
876 views

Are there any CubeSats that have been launched into Geostationary (GEO/GSO) or Geostationary Transfer Orbit (GTO)?

There is one mission by GSFC/NASA - Shields-1 to be launched into GTO. Apart from that I couldn't find any other mission to GTO/GEO. It would be of great help if there is any information on this.
3
votes
1answer
351 views

ViaSat's 18 kW solar array - largest ever for a commercial telecom satellite?

Now that the protests at Kourou Space Center in French Guiana are over, Arianne has launched both EutelSat 172B and ViaSat-2 as 2017-029A. While EutelSat 172B has a ...
4
votes
2answers
188 views

Are sun outages having more limited impact in some cases?

Sun outages occur when a satellite, usually one in a geostationary orbit, passes between a ground station and the sun. Seen from the point of view of the ground station, the sun looks like it passes ...
2
votes
0answers
119 views

How might (or has) the 'gift' transponders on ISRO's GSAT-9 be used by other countries?

edit: It's been seven months now, have any of the 'gift' transponders been used or at least tested yet by the gift recipient nation? The BBC news item India launches 'invaluable' South Asia satellite ...
6
votes
2answers
239 views

Is there a synchronous orbital height for Phobos?

My assumption is that any body in the solar system would have it's own specific geo-synchronous orbit height. But when I took a look at Phobos and calculated the GEO height based on the simple formula ...
3
votes
1answer
224 views

How big (broad) is GEO orbit?

This post got me thinking about something I've never quite been able to picture about geostationary orbit. In a perfect model of a spherical earth, there is an infinitesimal circle in the plane of the ...
16
votes
2answers
3k views

Why are obsolete geostationary satellites re-orbited above the geostationary belt?

That seems a bit counter-intuitive, because in an orbit above the belt, the satellite would eventually lose gain velocity, so its orbit would intersect the orbital plane of the geostationary ...
7
votes
1answer
1k views

How stationary is geostationary?

When a satellite is in geostationary orbit, it is supposed to stay above one spot of the earth and rotate around the earth at the same rate the earth spins. But how exact does that equality need to be?...
5
votes
0answers
159 views

extreme longevity of geostationary orbits

I was speculating that geostationary satellites could be around possibly for billions of years (i.e. much beyond the point where plate tectonics would have erased all traces of human civilization on ...
11
votes
1answer
600 views

How much is a geostationary satellite expected to deviate from the geostationary orbit?

I've read this already and some Wikipedia articles, but found no real estimates on how much does a satellite deviate from its standard location. Say that the standard sub-satellite point (SSP) is <...
1
vote
2answers
735 views

How to calculate the trajectory needed to enter geostationary orbit?

Im building a rocket simulation engine and I would like to try and calculate the components of acceleration required to get the rocket into geostationary orbit. For example, the yellow and green lines ...
5
votes
1answer
249 views

What factors would make station-keeping of an Areostationary Mars satellite necessary?

This answer introduced me to the word Areostationary Orbit - (hint, comes from Ares), an orbit that would remain stationary above a point on the equator of Mars. The article mentions that ...
4
votes
2answers
322 views

At what magnitude would adjacent large geostationary communications satellites see each other?

Imagine I'm sitting on a geostationary satellite. I can see the Earth in front of me. It's about the size of a soccer ball at arm's length. To the left and right, I can see similar satellites in the ...
2
votes
1answer
415 views

Inclination change to Geostationary Orbit

How is inclination change performed for satellites inserted into GEO? With most launches performed from spaceports at various high latitudes, it's impossible to launch directly into equatorial ...
6
votes
2answers
187 views

Why will GOES-R take a whole year for validation?

I've been reading a few things about NOAA's GOES-R satellite, and I noticed this on the GOES-R site: ...will be placed in the 89.5° checkout orbit where it will undergo an extended checkout and ...
3
votes
1answer
261 views

CZ-5 plus YZ-2 put SJ-17 in GEO - third stage or separate spacecraft?

CZ-5 = Long March 5 YZ-2 = Yuanzheng 2 SJ-17 = Shijian 17 Gunter's Space Page says: SJ 17 (Shijian 17) is a Chinese experimental satellite flown on the maiden CZ-5/YZ2 launch. It is ...
4
votes
4answers
2k views

For which applications are LEO and GEO substitutable?

This article, this article, and this earlier question indicate that, given enough satellites in LEO, it's possible to substitute between GEO and LEO. The first article and the question have some ...
2
votes
1answer
264 views

Satellite Remaining Life

How can I know the remaining life of a satellite? I have been using satbeam, and try to calculate it based on launch date + expected life, but it seems to have some problems. For example, for this ...
2
votes
2answers
129 views

What would be the postal/delivery address for an orbiting vehicle? [closed]

It's possible/likely that one day we'll be able to post/mail/deliver stuff to a non-terrestrial vehicle, such as an orbiting vehicle or an extraterrestrialLy landed vehicle, without involving the ...
7
votes
1answer
748 views

What is the process for allocating GEO slots to commercial satellites?

Building off of this previous question, is there a more detailed summary anywhere of the process that a commercial satellite would have to go through to obtain a GEO slot? The documentation I have ...
8
votes
1answer
390 views

Do geosynchronous satellite launches require a tight launch window?

I thought only launches to rendezvous (resupply, repair, space station expansion etc) and direct launches into interplanetary trajectory require precisely timed launch window. Then I read: Geosync ...
8
votes
1answer
642 views

Thrust and rotation strategy to circularize a standard GTO orbit using ion propulsion?

The previous question How much time does it take to circularize a GTO orbit using ion propulsion? has a good, quantitative answer based on a known delta-v. But I'm wondering how would you actually ...
4
votes
1answer
616 views

What is the minimum rocket mass that can achieve GEO

A tiny model rocket can't get up very high. Massive rockets can make it to GEO. There must be some theoretical mass threshold where the rocket is "big enough" to make it to GEO - what is that mass? ...
9
votes
2answers
1k views

How is the launch window decided for GTO launches?

What launch vehicle, spacecraft and target orbit parameters decide the time of launch to GTO for satellites destined for GEO? The target orbital slot is always in the same relative position to the ...
11
votes
1answer
1k views

Tethered geostationary orbit

One of the biggest issues that I've heard of in building a space elevator is the high tensile strength of the cord used to tether the the elevator to the ground. If there's a structure that's at ...
6
votes
2answers
2k views

How do communication satellites remain positioned above a particular region?

From what I understand, an object has to keep moving in an orbit to not come crashing down to Earth. (The ISS is the first thing I think of for this.) How then, do satellites which are purpose built ...
11
votes
2answers
1k views

What is the reason for the Ariane 5 launcher with Intelsat 29e losing altitude?

After reaching a peak altitude of 222 km the Ariane 5 launcher with Intelsat 29e starts to lose altitude. What is the reason for this trajectory? Youtube video Paper on Ariane 5
8
votes
2answers
1k views

Differences between launch injection and transfer orbits for geostationary satellites

I am familiar with all different orbits but I struggle with the new launch injection method in GTO. What are the differences between sub-synchronous and super-synchronous transfer orbits compared to ...
17
votes
5answers
2k views

What's salvageable from a dead satellite?

DARPA has proposed orbital maintenance and salvage robots. I had gathered a list of links that was lost when DARPA rearranged their website. But I was able to find this page: Phoenix Makes Strides in ...
-2
votes
1answer
201 views

min time a direct ascent ASAT rocket would take to reach GEO [closed]

Trying to work out a rough time estimate for an ASAT rocket to reach GEO height?
0
votes
0answers
181 views

How much extra performance could Falcon 9 have if launched from the equator? [duplicate]

Today I learned about Sea Launch, essentially a launch pad floating on the sea. (Pretty crazy, right?) What's cool about that is that you can launch from the equator without the tricky part about ...