In this research, a case study was conducted on a hypothetical satellite constellation based on standard 12U CubeSat satellites. Initially, the key technical specifications of the satellite, including the mass of its main subsystems, were extracted and presented in detail. The masses of subsystems such as Attitude Determination and Control System (1.845 kg), Central Processing Unit (0.716 kg), Electrical Power Supply (2.182 kg), Structure (3.965 kg), Payload (13 kg), and other components were identified, resulting in a total satellite mass of less than 24 kilograms. Subsequently, by employing the proposed cost model, a detailed cost estimation related to a single 12U satellite unit within the overall constellation program framework was provided (as per Table 3). The results of this modeling indicate that the estimated total cost per satellite amounts to $1,215,000. This total cost includes the main cost components as follows: satellite hardware and initial development ($620,100), Assembly, Integration, and Testing (AIT) costs ($899,140), program-level and management expenses ($196,140), launch operations support costs ($111,110), and ground support equipment costs ($92,320). This study demonstrates that directly linking the technical specifications of subsystems to cost components enables more accurate cost estimation and more efficient sensitivity analysis for planners and aerospace systems engineers. It significantly contributes to a better understanding of the key factors influencing the final costs of satellite constellations.