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3
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1answer
85 views

Verify solar radiation torques on a satellite

I'm creating a design support system for Attitude control design of a spacecraft. For the attitude simulator, I have made a function to compute the solar radiation torque acting on the satellite which ...
13
votes
1answer
879 views

What is the principle behind Mariner 4's “Solar Pressure Vanes”? In what case(s) would they be effective?

The image below, found in this answer shows four "Solar Pressure Vanes" on Mariner 4. I've never heard of such a thing. I can imagine that it might have been thought to help favor the spacecraft's ...
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3answers
65 views

What is a gyrocompass and how might one be be used by a planetary rover?

In comments and links therein below the question How does Curiosity know how to point and move it's high gain antenna in real time? there is mention of a gyrocompass. I am aware that gyros can be ...
2
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0answers
53 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 ...
0
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2answers
78 views

Tradeoffs using a battery/motor/gyro versus tangential thrusters to spin a spherical shell in space?

Using the Humanity Star (see this answer for example for background/context), consider two possibilities for spinning a small spherical shell at a low rate, say perhaps in the neighborhood of 2 to 10 ...
1
vote
1answer
282 views

What is Rocket Lab's new Curie “Kick Stage”?

This reddit points to Rocket Lab's news page Rocket Lab successfully circularizes orbit with new Electron kick stage. It is named Curie, presumably after Marie? According to the Rocket Lab's article: ...
3
votes
1answer
84 views

Initial condition for SGP4 in satellites without GPS, before the uplink of TLE data

I believe that the SGP4 model for orbit estimation for LEO satellites uses TLE data as initial condition. Some CubeSats chose to use up-link TLE data than installing GPS. My question is for the case ...
3
votes
1answer
122 views

Effect of permanent magnet and solid core magnetorquer on magnetometer reading

Permanent magnet as passive stabilization and magnetorquer with solid core as active stabilization has been used over the year in satellites.But the would have magnetic field lines, wouldn't they ...
5
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0answers
96 views

How will GomX-4B manage angular momentum when using butane thrusters to move?

Phys.org's ESA's next satellite propelled by butane describes GomX-4B's butane powered cold gas thrusters, and how it will test them and use them to navigate to different distances from its partner ...
12
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1answer
2k views

How do Voyager 1's Trajectory Control Thrusters differ from its Attitude Control Thrusters?

There are several popular news items about the recent test of Voyager 1's Trajectory Control Thrusters to see if they can be used for attitude control to facilitate communication with Earth. The ...
1
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1answer
318 views

Placement of Reaction Wheels in a nano satellite

The reaction wheels rotate the satellite only about the centre of mass.If the reaction wheels are not placed about the principal axes,Will the amount of torque produced be the same as when they are ...
9
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0answers
867 views

How does JAXA's “Int-Ball” manage airflow to optimally navigate inside the ISS?

above: From the BBC's Japan's zero-gravity space drone sends first pictures from ISS. This is JAXA's GEM internal ball camera, or "Int-Ball". Kawaii! It looks like it uses a three axis attitude ...
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0answers
121 views

Will Mayak's large solar reflector produce a stable attitude, or is it likely to start tumbling or rotating?

In this question I've asked about the possible reflection of UHF radio signals from the recently launched Mayak cubesat once it's large metallized polymer solar reflector is deployed. However it will ...
4
votes
1answer
209 views

Controller to reaction wheel interface

A typical controller generally gives control torques which should be applied about the axis of a satellite. How exactly is this torque applied using a reaction wheel? For example if control torques ...
5
votes
0answers
170 views

How well and how rapidly can the ISS attitude control system detect periods of astronaut activity?

The question Why doesn't ISS start to spin if people walk inside? is a good one partly because it has attracted several good, informative answers. One of them is particularly intriguing because it ...
6
votes
1answer
501 views

How do rate gyros measure yaw, roll and pitch rates?

I need some help in understanding how rate gyros are used for measuring rotation rates about the yaw, roll, and pitch directions. Suppose a gyro is used for measuring roll rate. How should the spin ...
1
vote
2answers
370 views

Why are the ISS attitude values shown on these two web sites so different?

Here are screen captures from two sites that seem to be showing approximately live - or at least changing - telemetry from the ISS. They both say the spacecraft attitude is shown in degrees. Looking ...
7
votes
2answers
220 views

Could the ISS stop rotating wrt the stars for a few days, then start again?

Suppose for some reason it was particularly advantageous to stop the ISS from rotating once per orbit, so that it maintained a constant attitude with respect to the stars (or the Sun) instead of with ...
2
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0answers
83 views

How well could the tether tension method of attitude control actually ultimately work for a cubesat system?

The phys.org new item Image: Small satellite deployed from the Space Station shows the cubesat craft Space Tethered Autonomous Robotic Satellite (STARS-C) being deployed from the ISS. A satellite ...
2
votes
1answer
368 views

Why are some reaction wheels sealed with low pressure gas, others with vacuum?

This answer and this answer address the question Do reaction wheels generally run in vacuum, or are they pressurized? Sealed or vented? and they both mention that sometimes momentum wheels are sealed ...
2
votes
2answers
220 views

Do reaction wheels generally run in vacuum, or are they pressurized? Sealed or vented?

Is there some general trend for the operating pressure of reaction wheels? I can imagine low to no pressure has obvious advantages of low to no drag (more drag requiring more power, beyond that ...
1
vote
1answer
223 views

Can gyroscopic stabilization be done without any rotating parts?

In the video linked in this answer the spacecraft is said to be "gyroscopically balanced" (at about 00:20). I'm going to ask about the terminology associated with the phrase "gyroscopic ...
8
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3answers
2k views

Does the way this experimental kill vehicle moves and thrusts suggest it contains inertia wheels?

This comment below this answer about 'spacecraft' or at least 'craft' that can maneuver near the surface of low gravity bodies links to this video about Lockeed Martin's Multiple Kill Vehicle. If I ...