Recent content by Ajaja

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    Better Ephemerides, Rotation Models, and a Solution to X64 Builds

    Yes, pxfrm and the conversion from right-hand to left-hand should work. But needs some testing :)
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    Better Ephemerides, Rotation Models, and a Solution to X64 Builds

    Orbiter uses Rotation matrix void CelestialBody::GetRotation (double t, Matrix &rot) BTW, some years ago I made a Python script that compares SPICE rotation and Orbiter rotation and optimizes the parameters (LAN/Obliquity/SidRotOffset/SidRotPeriod) to fit better over a given time interval. It...
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    Better Ephemerides, Rotation Models, and a Solution to X64 Builds

    The one important thing that is missing now is celestial body orientation. SPICE can handle this very easily. I think the simplest way is to add something like this to Celbody.cpp, in CelestialBody::GetRotation(..): if (module && module->bRotation()) return module->clbkRotation(mjd, rot)...
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    Better Ephemerides, Rotation Models, and a Solution to X64 Builds

    Finally, I’ve fixed this in https://github.com/Ajaja/spice_orbiter There is now no need to duplicate kernel loading in each *.cfg file. I’ve also updated orbiter.bsp for the latest SPK versions and added a GitHub Actions script to build spice.dll.
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    Updates Artemis II

    I only just now noticed that the NASA visualization has the same Earth clouds texture as Celestia.
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    Updates Artemis II

    In Celestia:
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    Updates Artemis II

    ~1380 m/s: Updated from Horizons System trajectory: BEGIN_URLDESC CurrentState END_URLDESC BEGIN_ENVIRONMENT System Sol Date MJD 61136.458333 END_ENVIRONMENT BEGIN_FOCUS Ship Artemis II END_FOCUS BEGIN_SHIPS Artemis II:DeltaGlider STATUS Orbiting Earth RPOS -1.234639192836895E+08...
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    Updates Artemis II

    Excellent comparison! How did you do this in SpaceEngine? I wasn't able to find a way to set precise spaceship coordinates and velocity vectors for a given moment.
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    Updates Artemis II

    It's ExtMFD in the latest Windows version of OpenOrbiter from GitHub.
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    Updates Artemis II

    Current trajectory according to the JPL Horizons System: BEGIN_URLDESC CurrentState END_URLDESC BEGIN_ENVIRONMENT System Sol Date MJD 61133.354167 END_ENVIRONMENT BEGIN_FOCUS Ship Artemis II END_FOCUS BEGIN_SHIPS Artemis II:DeltaGlider STATUS Orbiting Earth RPOS...
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    Updates Artemis II

    Looks just right :)
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    Better Ephemerides, Rotation Models, and a Solution to X64 Builds

    In the kernel pool. It's all managed by SPICE library, I didn't dig deep into the details.
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    Better Ephemerides, Rotation Models, and a Solution to X64 Builds

    Strictly speaking, the orbiter.bsp in the body configuration files are not necessary. The SPICE library needs to load each kernel file only once. I had previously used multiple kernel files for different bodies before merging them into a single orbiter.bsp file. Repeating this orbiter.bsp entry...
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    Hubbles Constant (Ho) fixed to light speed, C and calculated as 71 k/s/Mpc

    Where do you see Mpc in the formula? I see ly*km/s. So, it's the new value of Hubblus Constant = 71 ly*km/s. :)
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    Orbiter as a visualization tool of external data

    It would be nice. I use OpenOrbiter x64 and haven't built the spice module for O2016.
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