TY - JOUR
T1 - Galileo disposal strategy
T2 - Stability, chaos and predictability
AU - Rosengren, Aaron J.
AU - Daquin, Jérôme
AU - Tsiganis, Kleomenis
AU - Alessi, Elisa Maria
AU - Deleflie, Florent
AU - Rossi, Alessandro
AU - Valsecchi, Giovanni B.
N1 - Publisher Copyright:
© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2017/2/1
Y1 - 2017/2/1
N2 - Recent studies have shown that the medium-Earth orbit (MEO) region of the global navigation satellite systems is permeated by a devious network of lunisolar secular resonances, which can interact to produce chaotic and diffusive motions. The precarious state of the four navigation constellations, perched on the threshold of instability, makes it understandable why all past efforts to define stable graveyard orbits, especially in the case of Galileo, were bound to fail; the region is far too complex to allow for an adoption of the simple geosynchronous disposal strategy. We retrace one such recent attempt, funded by ESA's General Studies Programme in the frame of the GreenOPS initiative, that uses a systematic parametric approach and the straightforward maximum-eccentricity method to identify long-term-stable regions, suitable for graveyards, as well as large-scale excursions in eccentricity, which can be used for postmission deorbiting of constellation satellites.We then apply our new results on the stunningly rich dynamical structure of the MEO region towards the analysis of these disposal strategies for Galileo, and discuss the practical implications of resonances and chaos in this regime. We outline how the identification of the hyperbolic and elliptic fixed points of the resonances near Galileo can lead to explicit criteria for defining optimal disposal strategies.
AB - Recent studies have shown that the medium-Earth orbit (MEO) region of the global navigation satellite systems is permeated by a devious network of lunisolar secular resonances, which can interact to produce chaotic and diffusive motions. The precarious state of the four navigation constellations, perched on the threshold of instability, makes it understandable why all past efforts to define stable graveyard orbits, especially in the case of Galileo, were bound to fail; the region is far too complex to allow for an adoption of the simple geosynchronous disposal strategy. We retrace one such recent attempt, funded by ESA's General Studies Programme in the frame of the GreenOPS initiative, that uses a systematic parametric approach and the straightforward maximum-eccentricity method to identify long-term-stable regions, suitable for graveyards, as well as large-scale excursions in eccentricity, which can be used for postmission deorbiting of constellation satellites.We then apply our new results on the stunningly rich dynamical structure of the MEO region towards the analysis of these disposal strategies for Galileo, and discuss the practical implications of resonances and chaos in this regime. We outline how the identification of the hyperbolic and elliptic fixed points of the resonances near Galileo can lead to explicit criteria for defining optimal disposal strategies.
KW - Celestial mechanics
KW - Chaos
KW - Methods: analytical
KW - Methods: numerical
KW - Planets and satellites: dynamical evolution and stability
KW - Planets and satellites: general
UR - http://www.scopus.com/inward/record.url?scp=85012274456&partnerID=8YFLogxK
U2 - 10.1093/mnras/stw2459
DO - 10.1093/mnras/stw2459
M3 - Article
AN - SCOPUS:85012274456
SN - 0035-8711
VL - 464
SP - 4063
EP - 4076
JO - Monthly Notices of the Royal Astronomy Society
JF - Monthly Notices of the Royal Astronomy Society
IS - 4
ER -