Attitude Control


A-3001 ACS Primary

The primary mode of the attitude control system (idle, sunline, celestial). This data tells us whether the attitude control system is running or not.

A-0002 ACS Sub Mode

The secondary (sub) mode of the attitude control system (idle, sunline, celestial). This mode tells us whether the attitude control system is busy or not.

A-0040 Estimated Spin Rate

The spin rate (in rpm) estimated by the attitude control software from sun sensor data.

A-3708 Sun Cone

The number of degrees the Sun is off of the spacecraft spin axis. Usually this number stays within 45 degrees.

A-3701 Earth Angle

The number of degrees the Earth is off of the spacecraft spin axis. Usually this number stays within 45 degrees.

A-3110 Latch Valve State

This tells us whether the propulsion latch valves are open or closed. These valves separate the hydrazine fuel tanks from the thrusters.