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Bookmark or Share- fundamental astronomy - Difference between J2000, FK5 and ICRS ...The questions confuses things: J2000 is the epoch / equinox in which the catalogue is in. This defines the reference point in time for Right Ascension and Declination.
- orbit - Can someone explain to me the TEME reference frame in defining ...TEME of Date—With this option, the epoch of the TEME frame is always the same as the epoch of the associated ephemeris generation time. The transformation to ECEF is done by first finding the conversion from TEME to TOD (third equation in Eq. (1)). Next the standard transformation from TOD to ECF is computed.
- orbital mechanics - How to convert TEME (or ITRF) to horizontal ...I have TEME coordinates from sgp4 propagation. I can convert those (in python) to ITRF given date and time of observation. How to convert coordinates from one of those two frames to horizontal azimuth and altitude frame given latitude, longitude and elevation of observer?
- orbit - Computing the local orbital frame vector directions in a ...I would interpret this as the Local Vertical, Local Horizontal (LVLH) frame (see, e.g., Vallado and McClain, Fundamentals of Astrodynamics and Applications, 4th ed., p. 156).
- Conversion between Astronomical Frames, ex. IRCF, FK5, FK4, etc…I'm not sure this answers your question, but ICRF is a non-precessing reference frame. On J2000 (2000-01-01 12:00:00 UTC), the z axis of the ICRF frame was exactly parallel to a line connecting the Earth's center to the Earth's north pole.
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