Аннотация:The paper formulates generalized requirements for the air-breathing electric propulsion (ABEP) using the outboard atmospheric gases as a propellant for the long-term spacecraft (SC) keeping in the near-planetary orbit. With the solar array (SA) as a primary energy source, a long-term SC flight in vicinity of planets with an atmosphere becomes possible using the renewable resources only. Requirements for an ABEP are derived from the condition of drag compensation, and ensure the admissible gas concentration in the ABEP ionization chamber, as well as power supply from a SA. When assessing electric power available for the ABEP, the best and worst conditions of the SA illumination are for a SC long-term flight in the circular orbits near Venus, Earth, and Mars taking into account the planetary axis inclination and non-centrality of the gravitational fields. The obtained requirements for the ABEP characteristics to keep the near-planetary orbits lie in the practical range for the existing electric propulsion technologies. The paper shows that, despite the lower solar irradiation flux, the least stringent requirements for the ABEP characteristics are imposed in the near-Mars orbits, which is determined by the comparatively low circular orbital velocity. Advantages of the SA illumination near Venus could be used for a short time interval due to impossibility of the long-term conservation of small angles between the spacecraft orbit normal to the plane and direction to the Sun.