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Solar Sail Trajectory Optimization for the Solar Polar Imager (SPI) Mission

Dachwald, Bernd and Ohndorf, Andreas and Wie, Bong (2006) Solar Sail Trajectory Optimization for the Solar Polar Imager (SPI) Mission. AIAA/AAS Astrodynamics Specialist Conference, 2006-08-21 - 2006-08-24, Keystone. CO (USA).

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The Solar Polar Imager (SPI) mission is one of several Sun-Earth Connection solar sail roadmap missions currently envisioned by NASA. A current SPI reference mission design is based on a 160 m x 160 m, 150 kg square solar sail assembly with a 250 kg spacecraft bus and a scientific payload of 50 kg (450 kg total mass), having a characteristic acceleration of 0.35 mm/s<sup>2</sup>. Using a conservative solar sail film temperature limit of 100°C to constrain the solar distance ("cold" mission scenario), our transfer trajectory to the SPI target orbit (circular orbit at 0.48 AU solar distance with 75 deg inclination) approaches the sun closer (to about 0.4 AU solar distance) than a current reference trajectory and therefore, exploiting the larger solar radiation pressure, takes - even with a lower hyperbolic excess energy for interplanetary insertion - only 6.4 instead of 6.7 years. For a higher sail temperature limit of 240°C ("hot" mission scenario), the optimal transfer trajectory approaches the sun much closer (to about 0.22 AU solar distance), resulting in an even shorter transfer duration of only 4.7 years. Based on this "hot" mission scenario, we perform several mission tradeoffs to gain a deeper insight into the trade space of the SPI mission: different sail temperature limits, different characteristic accelerations, different interplanetary insertion energies, and different sail degradation behaviors are investigated.

Item URL in elib:https://elib.dlr.de/47787/
Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:Paper is available via download at the AIAA website or the AIAA Meeting Paper CD
Title:Solar Sail Trajectory Optimization for the Solar Polar Imager (SPI) Mission
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Date:August 2006
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Solar Sail, Trajectory Optimization, Solar Polar Imager
Event Title:AIAA/AAS Astrodynamics Specialist Conference
Event Location:Keystone. CO (USA)
Event Type:international Conference
Event Dates:2006-08-21 - 2006-08-24
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W SY - Technik für Raumfahrtsysteme
DLR - Research area:Space
DLR - Program:W SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):W - no assignment (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training > GSOC-German Space Operations Center
Deposited By: Dachwald, Dr.-Ing. Bernd
Deposited On:10 Apr 2007
Last Modified:27 Apr 2009 13:37

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