Exoplanets; Fuel budget; Occulter; Optimization; Scheduling; Starshade; Trajectory; WFIRST; Comprehensive costs; Exo-planets; Formation flying missions; Linear cost functions; Selection scheme; Electronic, Optical and Magnetic Materials; Condensed Matter Physics; Computer Science Applications; Applied Mathematics; Electrical and Electronic Engineering
Abstract :
[en] An exoplanet direct imaging mission using an external occulter for starlight suppression could potentially achieve higher contrasts and throughputs than an equivalently sized telescope with an internal coronagraph. We consider a formation flying mission where the starshade must station-keep with a telescope, assumed to be on a halo orbit about the Sun-Earth L2 point, during observations and slew between observations as the telescope re-orients to target the next star. We use a parameterization of the slew fuel cost calculation based on interpolation of exact solutions of boundary value problem in the circular restricted three body formalism. Time constraints are imposed based on when stars are observable due to the motion of bright sources in the solar system, integration times, and mission lifetime constraints. Finally, we present a comprehensive cost function incorporating star completeness values as a reward heuristic and retargeting fuel costs to sequentially select the next best star to observe. Ensembles of simulations are conducted for different selection schemes; for a 3 year mission, taking two steps of the linear cost function produces the most unique detections with an average of 7.08± 2.55.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Soto, Gabriel; Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, United States
Keithly, Dean; Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, United States
Garrett, Daniel; School of Mechanical and Aerospace Engineering, Princeton University, Princeton, United States
Delacroix, Christian ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Planetary & Stellar systems Imaging Laboratory ; Carl Sagan Institute, Cornell University, Ithaca, United States
Savransky, Dmitry; Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, United States
Language :
English
Title :
Optimal starshade observation scheduling
Publication date :
2018
Event name :
Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave
Event place :
Austin, Usa
Event date :
10-06-2018 => 15-06-2018
Main work title :
Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave
Editor :
Fazio, Giovanni G.
Publisher :
SPIE
ISBN/EAN :
978-1-5106-1949-4
Peer reviewed :
Editorial reviewed
Funders :
NASA - National Aeronautics and Space Administration
Funding text :
This work is supported by NASA Grant No. NNG16PJ24C (SIT). 4D Technology; Andor Technology, Ltd.; Astronomical Consultants and Equipment, Inc.; Giant Magellan Telescope; GPixel, Inc.; et al.
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