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    How calculate the minimum Delta v necessary to change one given orbit into another given orbit?

    Lambert's problem + numerical optimization?
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    Updates James Webb Space Telescope updates

    Yes, mayby. The data is based on: TRAJECTORY MCC1A (65-minute engine burn) began 2021-Dec-26 12:50 UTC, completed 01:55 UTC. MCC1B (09:27 engine burn) began 2021-Dec-28 12:20 UTC, completed 12:29:27 UTC. Post-launch trajectory from Goddard Flight Dynamics Facility (FDF), based on data...
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    Updates James Webb Space Telescope updates

    Interesting. It's heading slightly (or even not so slightly) off L2. There are scenarios with L2 (the data is from Horizons System too):
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    Updates James Webb Space Telescope updates

    @BEEP Check it yourself :) Data from https://ssd.jpl.nasa.gov/horizons/app.html#/ : BEGIN_ENVIRONMENT System Sol Date MJD 59579 END_ENVIRONMENT BEGIN_FOCUS Ship JWST END_FOCUS BEGIN_SHIPS JWST:Deltaglider STATUS Orbiting Sun RPOS -2.358205523858005E+10 -2.539440950672254E+08...
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    D3D9Client (semi-native) + Orbiter test build

    Maybe it's looking for debug libraries/dlls? I built https://github.com/orbitersim/orbiter/tree/d3d9client for myself, everything works fine, but I changed target to x64-Release.
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    D3D9Client (semi-native) + Orbiter test build

    @n72.75 Check d3dx9_NN.dll files in your C:\Windows\System32 and C:\Windows\SysWOW64 folders. Do you have all of them (from d3dx9_24.dll to d3dx9_43.dll)? If not, just install https://www.microsoft.com/en-us/download/details.aspx?id=8109 And what DirectX SDK did you use compiling...
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    D3D9Client (semi-native) + Orbiter test build

    @n72.75 There should be something like this in Orbiter.log: 000000.000: --------------------------------------------------------------- 000000.000: D3D9 DLLs : C:\WINDOWS\SYSTEM32\d3d9.dll [v 10.0.19041.1387] 000000.000: : C:\WINDOWS\SYSTEM32\d3dx9_43.dll [v 9.29.952.3111]...
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    Problem Sim shuts down at moon

    It's Modules\D3D9Client\D3D9ClientLog.html Last time I had shutdowns of Orbiter the module was a reason and only D3D9ClientLog.html gave a clue.
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    Problem Sim shuts down at moon

    Do you use D3D9Client? It has its own log file.
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    Discussion Improved (Tesseral) Gravity Model

    And we also need better rotation models for celestial bodies. Maybe like the atmosphere models and/or like an extension of CELBODY class.
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    General Question Shape of the Earth and Earth atmosphere in Orbiter 2016

    It's an old topic https://www.orbiter-forum.com/threads/orbiters-limits.838/page-2#post-54699 But now Orbiter is open source and everything is in our hands. :)
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    Discussion Improved (Tesseral) Gravity Model

    It's true. I played with orbits around Moon in GMAT. They are crazy, especially LLO. :) Even with simplified LP165P model. There is also grgm900c model - 900 degrees spherical harmonic model with tides.
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    Updates Blue Origin New Shepard News and Updates

    I prefer the old Soviet definition of "space flight". Space flight = orbital flight.
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    Orbiter and Earth rotation

    Yes, and optimization based on ITRF93 is a bit closer to SidRotPeriod in NASSP.
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    Orbiter and Earth rotation

    It turned out that IAU_EARTH is not accurate too: https://naif.jpl.nasa.gov/pub/naif/JUNO/kernels/pck/pck00010.tpc I did as they say and used ITRF93. There is deviation of [1,1,0] vector (north pole + prime meridian direction in Orbiter’s left-handed system) in radians from ITRF93 ...
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    Orbiter and Earth rotation

    I'm working now on tuning some celestial body rotation parameters in Orbiter, trying to make them closer to current IAU model using Python and pygmo2 optimization. For some bodies there is some space for optimization. For example Ganymede: Some rotation parameters are very close to optimal...
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    API Question Get name/mass of a CELBODY (and what if it is NULL?)

    @n72.75 It's a very old topic https://www.orbiter-forum.com/threads/spice-module.1108/ Orbiter has become open source but some celbody modules are missing (no x64 versions whatsoever), so switching to more precise JPL engine it's a reasonable solution. I still use Wishbone's latest code (from...
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    API Question Get name/mass of a CELBODY (and what if it is NULL?)

    The default Orbiter configuration has different modules for different celestial bodies and they don't always precisely agree with JPL. Maybe it's high time to finally migrate to the JPL/NAIF toolkit called SPICE and use those ephemerides in Orbiter. I did it many years ago. My log file looks...
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    API Question Get name/mass of a CELBODY (and what if it is NULL?)

    oapiGetObjectName / oapiGetMass There is source code of TransX MFD that may be useful (especially mapfunction::InitialiseSolarSystem() ): https://github.com/orbitersim/orbiter/blob/0326e4d077c5a4f880ae821e2d0c7d82dc10469c/Src/Plugin/TransX/mapfunction.cpp
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    Flight Question What is changing Phobos' orbit?

    I did other simulation in GMAT not using now MAR097 ephemerides for Phobos but integrating with Mars50c gravity field model. It matches MAR097 trajectory almost precisely. This wobbling definety happens because of the non-spherical perturbation of the gravity field. Deimos and Sun add almost...
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