J2000: One commonly used ECI frame is defined with the Earth's Mean Equator and Mean Equinox (MEME) at 12:00 Terrestrial Time on 1 January 2000. It can be referred to as J2K, J2000 or EME2000. The x-axis is aligned with the mean vernal equinox.

NIF The J2000 Inertial Frame •The J2000* (aka EME2000) frame definition is based on the earth’s equator and equinox, determined from observations of planetary motions, plus other data. Fundamental Concepts 10 Ecliptic plane Plane defined by movement of the earth around the sun Equatorial plane Plane normal to the earth’s spin axis, Z ...

The International Celestial Reference System (ICRS) defines coordinate axes that are closely aligned with those of the J2000 (aka EME2000) reference frame. The International Celestial Reference Frame (ICRF) and later versions of it (ICRF1, etc.) are realizations of the ICRS. For brevity, we'll simply refer to ``the ICRF'' below.

The GCRF frame is essentially the ICRF frame, but with a slightly different relativistic time scale. The JPL ephemerides (the underlying basis of JPL Horizons and JPL's SPICE system) treat the J2000 frame and the ICRF frames as equivalent.

Dec 1, 2023 · The International Celestial Reference System (ICRS) defines coordinate axes that are closely aligned with those of the J2000 (aka EME2000) reference frame. The International Celestial Reference Frame (ICRF) and later versions of it …

The EME2000 frame (which is also known as J2000) is defined using the mean equinox at epoch J2000.0, i.e. 2000-01-01T12:00:00 in Terrestrial Time (not UTC!). From this frame, applying precession evolution between J2000.0 and current date defines a Mean Of Date frame for current date and applying nutation defines a True Of Date frame, similar in ...

Nov 15, 2018 · Here is what I’m usually using for converting position and velocity vectors from EME2000 to ITRF: inertial_frame = FramesFactory.getEME2000() earth_frame = FramesFactory.getITRF(IERSConventions.IERS_2010, False) t_epoch = AbsoluteDate(int(t0[0]), int(t0[1]), int(t0[2]), int(t0[3]), int(t0[4]), float(t0[5]), TimeScalesF...

Get the unique EME2000 frame. The EME2000 frame is also called the J2000 frame. The former denomination is preferred in Orekit.

The CoG frame has its origin at the satellite center of gravity and is aligned with EME2000. It is linked to its parent EME2000 frame by an a priori unknown transform which depends on the current position and velocity.

NIF J2000 Frame •The J2000* (aka EME2000) frame definition is based on the earth’s equator and equinox, determined from observations of planetary motions, plus other data. Fundamental Concepts 17 Ecliptic plane Plane defined by movement of the earth around the sun Equatorial plane Plane normal to the earth’s spin axis, Z Intersection of