Astronomy Letters

, Volume 44, Issue 4, pp 289–295 | Cite as

Lunar Gravity-Assist Maneuver As a Way of Reducing the Orbit Amplitude in the Spectrum–Röntgen–Gamma Project

  • I. D. Kovalenko
  • N. A. Eismont


Spectrum–Röntgen–Gamma (SRG) is a space observatory designed to observe astrophysical objects in the X-ray range of the electromagnetic spectrum. SRG is planned to be launched in 2019 by a Proton-M launch vehicle with a DM3 upper stage. The spacecraft will be delivered to an orbit around the Sun–Earth collinear libration point L2 located at a distance of ~1.5 million km from the Earth. Although the SRG launch scheme has already been determined at present, in this paper we consider an alternative spacecraft transfer scenario using a lunar gravity-assist maneuver. The proposed scenario allows a oneimpulse transfer from a low Earth orbit to a small-amplitude orbit around the libration point to be performed while fulfilling the technical constraints and the scientific requirements of the mission.


Spectrum–Röntgen–Gamma gravity-assist maneuver libration points 


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Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  1. 1.Space Research InstituteRussian Academy of SciencesMoscowRussia

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