Solar radiation pressure effect on Telkom-1 using spherical model

Abstract Telkom-1 is a geosynchronous communications satellite owned by telecommunications company, PT Telkom Indonesia. This paper will discuss solar radiation pressure as one of the most significant perturbations in geostationary orbits. Solar radiation pressure models come in various types, each differing in complexity and accuracy. The simplest solar radiation pressure model is a spherical model, often used for educational or preliminary calculations. Based on our modelling, the results indicate that the semimajor axis values from the spherical model closely approximate the actual data. However, the eccentricity calculated from the spherical model is nearly ten times larger than that derived from the actual data. Additionally, the amplitude of the mean anomaly from the spherical model increases over time, and the spherical model of inclination also demonstrates an increasing trend with time.