Questions tagged [adcs]

Attitude Determination & Control Systems measure the attitude of a spacecraft and often execute measures to adjust the attitude with respect to the celestial sphere, reference bodies, or other spacecraft. They can be active including computations, or passive.

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What attitudes will Starlink satellites have in different orbits?

update 3: Guest Post: Modelling of Starlink trail brightness and comparison to observations update 2: Teslarati's SpaceX’s Starlink “VisorSat” launch plans revealed by Elon Musk explains Open Book ...
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Why does Orion's Jettison Motor, have four nozzles but eight Attitude Control Motors arranged in an octagon?

Spaceflight 101's Orion Spacecraft Overview shows the following tests for the escape system. Why are there eight ACS thrusters arranged octagonally? Is it just to reduce cosine losses or does this ...
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Spacecraft Inertial Data

I am a developer of motion analytics algorithms. I have been using a 9 Dof strap-down IMU on human and land vehicles for these algorithms. I Would be interested to test my algorithms with IMU data ...
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How do Falcon-9's cold gas thruster maneuvers account for the center of mass changes due to “floating fuel shifts”?

The Art of Engineering video How SpaceX Lands Rockets with Astonishing Accuracy after 07:19 explains: Cold Gas Thrusters The falcon 9 is equipped with a total of ...
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Essential sensors for cubesat ADCS

We are building a 3U satellite to orbit Earth and measure space debris. Between gyroscope, GPS, IMU, magnetometer, Sun sensors and star tracker, which would be essential sensors for the ADCS? Or ...
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Puzzler: which Apollo 8 astronaut would have been positioned furthest sunwards 20 minutes after lunar insertion?

This Classic @DavidHammen answer to the question Who has been the closest to/furthest from the Sun? says: This bodes well for an Apollo astronaut being the person closest to the Sun, but bodes ill ...
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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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Are spacecraft star cameras ever used as scientific instruments for research?

There are quite a lot of spacecraft that have been up there a while and a lot of them have star cameras for attitude determination and for attitude control. Space telescopes (both heavenly and Earth-...
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Control torque to a Reaction wheel that compensates for friction - need help understanding a working code

Reaction wheel in a s/c is driven by controller torque. However, since there is friction torque in RW, less than the reqd momentum change is achieved. Hence the control torque must be increased by ...
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Would Mayak's large solar reflector have produced a stable attitude, or more likely start tumbling or rotating?

update: Answers to Two week mark; has Mayak (Маяк) been spotted yet? Reflector deployed? Astronomy “ruined”? indicate that the reflector did not deploy successfully (more at Mayak, a magnitude -10 (...
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How are Voyager's 16 thrusters oriented?

@RussellBorogove's excellent answer to the question How do Voyager 1's Trajectory Control Thrusters differ from its Attitude Control Thrusters? describes the locations and usage patterns of the 16 ...