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Space Launch System Launch Windows and Day of Launch ProcessesLunar missions benefit from varying the launch azimuth as a function of launch time to allow longer launch windows with minimum performance impacts. This variable azimuth approach allows the vehicle to track the Moon’s apparent motion due to Earth’s rotation. The Space Launch System (SLS) Block 1 vehicle design requires the mission to launch into an elliptical parking orbit to provide sufficient energy to insert Orion into a Trans-Lunar Injection (TLI) orbit. The primary benefit of varying the launch azimuth, and as a result the achieved orbit inclination, allows the SLS Interim Cryogenic Propulsion Stage (ICPS) to perform its TLI burn closer to perigee and take advantage of performing a burn in a location where the burn will optimally raise apogee.
Document ID
Document Type
Conference Paper
Anthony Scott Craig
(Marshall Space Flight Center Redstone Arsenal, Alabama, United States)
Naeem Ahmad
(Goddard Space Flight Center Greenbelt, Maryland, United States)
Date Acquired
July 15, 2020
Subject Category
Launch Vehicles And Launch Operations
Meeting Information
AAS/AIAA Astrodynamics Specialists Conference (Video presentation and paper submittal)(Virtual)
Funding Number(s)
WBS: 585777.
Distribution Limits
Work of the US Gov. Public Use Permitted.
launch window
day of launch processes
space launch system

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