A telemetry packet is used to transmit data from spacecraft to ground. Which of the following is commonly included?

A telemetry packet is used to transmit data from spacecraft to ground. Which of the following is commonly included?

• A. Sensor readings, status flags, and health metrics.
• B. User manuals for mission operators.
• C. Local weather reports on Earth.
• D. Astronaut biographies.

Answer: (A)

Telemetry packets are the streams that carry information about the spacecraft’s health and status back to the ground. They typically include housekeeping data such as sensor readings (for example, temperatures, voltages, pressures), status flags that show whether subsystems are nominal or faulted, and health metrics like battery state, thermal margins, and fault counters. This combination lets ground teams monitor how the spacecraft is behaving, detect anomalies, and assess overall health. Other options don't fit because manuals, on-ground reference documents, external weather reports, or biographical information aren’t produced by the spacecraft as part of its health and status data. They belong to documentation or contextual information, not the telemetry stream.

Telemetry packets are the streams that carry information about the spacecraft’s health and status back to the ground. They typically include housekeeping data such as sensor readings (for example, temperatures, voltages, pressures), status flags that show whether subsystems are nominal or faulted, and health metrics like battery state, thermal margins, and fault counters. This combination lets ground teams monitor how the spacecraft is behaving, detect anomalies, and assess overall health.

Other options don't fit because manuals, on-ground reference documents, external weather reports, or biographical information aren’t produced by the spacecraft as part of its health and status data. They belong to documentation or contextual information, not the telemetry stream.