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Questions tagged [geostationary]

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

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Most fuel-efficient deorbit from geostationary

Say a spacecraft in geostationary orbit needs to be deorbited (not very common, but bear with me). How does one decide when and how long should the retrograde burns be, in order to have started with ...
William R. Ebenezer's user avatar
6 votes
3 answers
383 views

Inclination maneuvers for GEO satellites

I was wondering about the orbital location to perform inclination nulling maneuvers for GEO satellites. I know from basic astrodynamics that the best place to perform inclination correction is at ...
Wild lion's user avatar
3 votes
1 answer
515 views

How does the "eccentricity-inclination vector separation" technique work for colocated GEO satellites?

This answer to How are co-located satellites positioned relative to each other? links to the paywalled paper Separation of Geostationary Satellites with Eccentricity and Inclination Vector with the ...
uhoh's user avatar
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2 votes
1 answer
462 views

Point Ahead Angle Calculation between LEO-GEO Satellite (ISL Scenario)

So, I have got two reference TLE from 2 different Satellite in LEO-GEO, which are as follows: (1st TLE for LEO, 2nd TLE for GEO) ...
JOY's user avatar
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4 votes
2 answers
434 views

SGP4 on Systems Tool Kit (STK); how to check if SDP4 deep space correction is implemented?

I am doing orbit propagation for a geostationary satellite which requires the deep space corrections of SDP4. See my previous question SGP 4 for Geostationary Satellite. I am using SGP4 on STK, but, ...
Elisa Fitri's user avatar
7 votes
1 answer
421 views

SGP 4 for Geostationary Satellite

I have read some sources that say that SGP4 is for satellite which have orbital period less than 225 minutes. For orbital period more than 225 minutes, we should use SDP4 instead. I need a ...
Elisa Fitri's user avatar
7 votes
2 answers
1k views

Why do these satellite antennas look so weird? (strangely shaped with little white dots...)

The NASA Spaceflight article Arianespace press onward with dual-passenger Ariane 5 launch shows a photo of Intelsat 39 during testing. The dish reflectors are strangely shaped: rather than being ...
uhoh's user avatar
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8 votes
1 answer
1k views

Could an areostationary satellite help locate asteroids?

Could NASA put an artificial radar telescope satellite in geosyncronous orbit around Mars to help locate dangerous asteroids on a trajectory that would place them on a path to strike Earth?
Gary Robert Davis's user avatar
51 votes
1 answer
5k views

Are there any satellites in geosynchronous but not geostationary orbits?

I know there are a lot of geostationary satellites out there, but I'm wondering - are there any geosynchronous satellites that are not geostationary (ie - have a notable inclination to their orbit)?
ThePiachu's user avatar
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14 votes
2 answers
1k views

Have there ever been cubesats in GEO?

This answer to the question How often do reaction wheels require desaturation, normally? says: One practical example I know of is for a 6U in GEO that is always sun pointed, there's a thruster ...
uhoh's user avatar
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2 votes
1 answer
186 views

How often are satellites in GEO moved to follow customer demand?

The BBC News article Inmarsat lays big satellite order with Airbus says: The firm is buying three new spacecraft to augment its Global Xpress system, which provides connectivity to on-the-move and ...
uhoh's user avatar
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1 vote
1 answer
521 views

Getting from LEO to a station in geostationary orbit and docking with it using a Hohmann transfer?

How long would it take for a spacecraft with a mass of 30,000 kg, to go from LEO to reach and match the speed of a space station in geostationary orbit so it could dock with the station, using a ...
Bob516's user avatar
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14 votes
4 answers
4k views

Why aren't space telescopes put in GEO?

I don't know of any space telescope that has been placed in geosynchronous orbit among the communication satellites. I wonder why not? In GEO, a space telescope could use a single stationary radio ...
LocalFluff's user avatar
1 vote
0 answers
185 views

Can I transmit signals from a wristwatch to geostationary orbit?

In comments below this answer to the question Which satellites can hear emergency signals from Scott Kelley's watch? we are (or at least I am) trying to figure out definitively if a wristwatch can ...
uhoh's user avatar
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2 votes
1 answer
405 views

ECEF to LLA Test Numbers

i have a list of GEO x,y,x coordinates and using Justin Mooney's R Script to convert to latitude, longitude, altitude(km). I'm looking for some test case numbers to verify Justin's xyz2lla function ...
user avatar
3 votes
3 answers
615 views

Are geostationary orbits impacted by changes to earths magnetic field?

Would geostationary satellites be pushed to different orbits by changes in the magnetic filed or even more so by shifting poles or even a reversal?
Roger's user avatar
  • 133
6 votes
3 answers
2k views

Determining GEO Orbital Slot from TLE

I'm trying to figure out the equation based on TLE data which orbital slot a GEO satellites occupies. I have the TLE data imported into R and I wish to know what satellites are in adjoining GEO ...
user avatar
4 votes
2 answers
761 views

What is meant by "a high-energy geostationary orbit"? (SpaceX Arabsat 6A)

The Teslarati article SpaceX’s April 7th Falcon Heavy launch a step toward new commercial markets says: While there is some inherent uncertainty surrounding the (once again) fairly new rocket, ...
uhoh's user avatar
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3 votes
1 answer
1k views

What is OneWeb's constellation's "progressive pitch" and how does it avoid interference with Ku-band satellites in GEO everywhere on Earth?

The Wikipedia article section OneWeb satellite constellation; Design characteristics tells us: The satellites will operate in the Ku band, communicating in the microwave range of frequencies in the ...
uhoh's user avatar
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1 vote
1 answer
972 views

How do Inmarsat 5 F4's beams correspond to all of these antennas and feeds?

note: This is an old-style @uhoh question meaning that it is a bit on the long side. In this case I think it really needs to be since the question is a bit complex; I'm trying to understand how all ...
uhoh's user avatar
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5 votes
1 answer
1k views

How do you calculate the lat and lon of a point on the earth using azimuth and elevation seen from a geostationary satellite?

I am given the longitude of a geostationary satellite and a pointing vector from the satellite in the form of azimuth and elevation angles looking from the satellite towards the earth (where zero ...
user1500069's user avatar
3 votes
1 answer
976 views

Is it possible to capture geostationary satellites with DSLR?

DSLR is to be mounted on a tripod and pointed at sky with a zoom lens. Would a sufficiently long duration of exposure reveal these non-moving satellites as bright "stars" amongst the streaks caused ...
karthikeyan's user avatar
  • 4,479
3 votes
1 answer
266 views

Why would the orbit of a satellite in GEO climb by 21 km in altitude over six months by itself?

This answer mentions several effects that tend to move geostationary satellites out of their "box" over time, but one really surprised me. According to the plot below (from there, but ...
uhoh's user avatar
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3 votes
1 answer
1k views

How often does a geostationary satellite enter into a Lunar shadow?

Is there a chance for the many geostationary satellites to enter into the moon’s shadow? If so, how frequently do such eclipses happen and how long do they typically last? Are such eclipses pre-...
karthikeyan's user avatar
  • 4,479
5 votes
1 answer
406 views

What's the closest that an Apollo mission passed GEO on its way to the moon?

@Uwe's comment No astronaut ever visited geostationary orbit at 22-23k miles to maintain or deploy satellites. The Apollo astronauts just rushed by on their way to the Moon and back. below the ...
uhoh's user avatar
  • 149k
9 votes
1 answer
506 views

What is typical lifetime of GTO rocket stages before reentry?

Most of geostationary satellites are launched at geostationary transfer orbit (GTO) first by rocket's upper stage. Than satellites separate and circularize the orbit by own propulsion. The upper ...
Heopps's user avatar
  • 9,061
3 votes
0 answers
178 views

Quantitatively, how deep are the stable equilibrium points in GEO? How much delta-v needed to move from one to the other?

This answer discusses a spacecraft in GEO using a two-impulse (circular → elliptical → circular) raise & lower maneuver to move (phase) itself by 180 degrees in longitude then return to synchrony. ...
uhoh's user avatar
  • 149k
8 votes
1 answer
1k views

Delta-v to move from GEO to GEO

To move a satellite in geostationary orbit, 166°55′E, to the antipode, 13° 4' 3.2" W, what delta-V would be needed for this to be accomplished? As for time constraints, I do not know what are the ...
Bob516's user avatar
  • 6,999
1 vote
1 answer
150 views

Atmospheric re-entry speed

What would be the difference in atmospheric re-entry speeds from LEO and GEO, assuming a Hohmman transfer orbit from GEO to re-entry? If I am getting the transfer orbit concept correct?
Bob516's user avatar
  • 6,999
9 votes
1 answer
384 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 ...
NeutronStar's user avatar
  • 1,049
3 votes
1 answer
114 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 ...
Cristiano's user avatar
  • 1,750
5 votes
1 answer
1k 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 ...
uhoh's user avatar
  • 149k
6 votes
2 answers
8k 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 ...
Jez Turner's user avatar
1 vote
2 answers
149 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 ...
uhoh's user avatar
  • 149k
2 votes
1 answer
149 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 ...
Roger Wood's user avatar
  • 3,884
3 votes
1 answer
4k 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 ...
iLLkeeN Nemo's user avatar
12 votes
6 answers
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 ...
Beezer's user avatar
  • 229
3 votes
1 answer
1k 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 ...
Bruno's user avatar
  • 31
3 votes
1 answer
179 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 (...
uhoh's user avatar
  • 149k
13 votes
2 answers
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 ...
uhoh's user avatar
  • 149k
2 votes
1 answer
172 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 ...
uhoh's user avatar
  • 149k
3 votes
1 answer
273 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) ...
uhoh's user avatar
  • 149k
0 votes
2 answers
824 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 ...
CRD567's user avatar
  • 19
0 votes
1 answer
48 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 ...
Adam Webb's user avatar
1 vote
0 answers
187 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 ...
CRD567's user avatar
  • 19
6 votes
3 answers
4k 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 ...
Mike Weber's user avatar
4 votes
1 answer
239 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 ...
Manu H's user avatar
  • 3,790
5 votes
2 answers
3k 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 ...
Mour_Ka's user avatar
  • 153
11 votes
2 answers
3k 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.
sky's user avatar
  • 181
3 votes
1 answer
1k 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 ...
uhoh's user avatar
  • 149k