Research
Ariadna
Mission Analysis and Design
Natural Formations in Astrodynamics

Natural Formations in Astrodynamics

Multiple spacecraft in formation yield significant benefits compared to single spacecraft including a reduction of the size and weight of the spacecraft with its consequent savings in launch costs, and the possibility of a fast replacement and redundancy in case of vehicle failure.

Formation Flying:

Spacecraft formations offer many potential applications in the future of space exploration, including the search for habitable terrestrial exoplanets, the identification of black holes, and many others. Multiple spacecraft in a formation yield significant benefits compared to single spacecraft including the possibility of high resolution for scientific applications, a reduction of the size and weight of the spacecraft with its consequent savings in launch costs, and the possibility of a fast replacement and redundancy in case of vehicle failure.

Most of the formation flying mission concepts typically investigate spacecraft placed on orbits around the Earth (see past project: Magic Inclinations). During the last decade, due to the detection of a large number of extrasolar planets, new studies on formation flying in multi-body regimes have emerged to support space astronomy.
Natural Formations in Multi-body Regimes::

Natural regions that are suitable to maintain multiple spacecraft in a loose formation are investigated near libration point orbits. Two halo orbits with different amplitudes are selected in the L2 Sun-Earth halo family as reference trajectories for this investigation.
Earth-Mars Pork-Chop graph

The suitable regions are derived analytically using variational equations relative to the reference path. These regions represent quadric surfaces of two types, either ellipsoids or elliptic cylinders, and the relationship between the type of quadric surfaces and the eigenstructure of the reference trajectory is investigated.

Placing the spacecraft in these regions results in a reduction in the control effort to maintain both the distance between the spacecraft and the specified formation pointing direction.

EVVEJS - Cassini SequenceEarth-Mars Pork-Chop graph


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