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y Space Shuttle orbiter Akatsuki (spacecraft) Fractional Orbital Bombardment System Orbiting Solar Observatory Orbital angular momentum of free electrons Orbit of Mars Orbital ring Orbital angular momentum multiplexing Orbital stability Timeline of first orbital launches by country D-Orbit Spin–orbit interaction C/2019 Y4 (ATLAS) Stargazer (aircraft) Commercial Orbital Transportation Services List of Mars orbiters C/2007 Q3 (Siding Spring) C/1980 E1 (Bowell) C/2017 K2 (PanSTARRS) C/2018 F4 (PanSTARRS) C/2000 W1 (Utsunomiya–Jones) C/2017 U7 (PanSTARRS) Orbiter (simulator) Comparison of orbital launcher families Intrinsic bond orbitals Spacecraft C/2015 ER61 (PanSTARRS) 23 Li