GEO station-keeping requirement: Typical on-station pointing accuracy for a commercial geostationary satellite must be maintained within approximately how many degrees?

Introduction / Context:
Geostationary satellites are assigned small orbital slots. To avoid interference with neighbors and maintain ground link quality, satellites must be kept within tight longitude/latitude bounds, expressed as an angular “box.”

Given Data / Assumptions:

• Commercial GEO satellite with routine station-keeping.
• Regulatory and coordination constraints define an on-station accuracy requirement.

Concept / Approach:

Typical station-keeping limits are on the order of ±0.05° to ±0.1° in longitude and latitude (combined box about 0.1–0.2°). This ensures pointing overlap with Earth-station beams and protects adjacent satellites from interference.

Step-by-Step Solution:

Verification / Alternative check:

Operator handbooks and ITU coordination documents align with ~0.1° class control for commercial communications payloads.

Why Other Options Are Wrong:

• 0.5–2°: far too loose; would risk interference and ground beam mispoint.
• 1–2° are characteristic of very coarse pointing, not acceptable for GEO comms slots.

Common Pitfalls:

• Confusing steerable antenna pointing accuracy with orbital station-keeping accuracy.

Final Answer:

0.1°