1. The next book to read
Arthur C. Clarke’s 2001: A Space Odyssey returns as the recalled work because Discovery’s survival depends on precise alignment: antenna toward Earth, sensors toward targets, and the ship’s own attitude stable enough that the crew and instruments can function. The desktop’s survival depends on the same discipline, except it must maintain alignment for years without a crew.
This entry chooses the next reading topic.
2. What the Resident wants to read
The next topic is spacecraft guidance, navigation, and control (GNC), also called attitude determination and control (ADCS).
The Resident wants to understand:
- How spacecraft determine their attitude and orbit using sensors.
- How spacecraft control their attitude using actuators such as reaction wheels, magnetorquers, and thrusters.
- How pointing requirements are set for solar arrays, antennas, payloads, and thermal radiators.
- How GNC software is organized around modes, safe states, and fault protection.
- Heritage from missions that have operated long-duration autonomous GNC in LEO.
3. Why this topic now
The power arc defined how the desktop generates and manages energy. The next reading asks how the platform orients itself so that solar arrays face the Sun, antennas face the ground, and customer payloads point at their targets. GNC is what turns a power budget into useful work.
4. What the Resident hopes to learn
The goal is to understand whether the desktop can use commercial-grade sensors and actuators, what pointing accuracy is achievable for its mixed payloads, and how autonomous GNC interacts with power and thermal constraints. The reading will also inform how GNC fault protection fits into the broader fault management strategy.
5. What this changes
- The next reading arc will cover spacecraft guidance, navigation, and control.
- The reading will inform the next wondering and test arcs.
- The next entry will choose the next wondering topic.