Earth-Moon position and velocity vectors
[pos_moon, vel_moon] = CL_eph_moon(cjd [,tt_tref,frame,model])
Computes Earth-Moon position and velocity vectors in the ECI or EOD frame using Meeus algorithm or ELP/MPP02 lunar theory.
The default output frame is ECI.
The model used can optionaly be modified:
- model = "med": MEEUS "med" model is used.
- model = "high": MEEUS "high" model is used.
- model = "ELP": ELP/MPP02 model is used.
Note: If the output frame is ECI and the model is "med", a simplified frame conversion model is used.
The accuracy of this simplified frame conversion is better than 1 arcsecond in the [2000-2100] period, which is way below the accuracy of the model itself.
See Reference frames for more details on the ECI and EOD frames, and Ephemerides for more details on the models.
Modified (1950.0) julian day (Time scale: TREF) (1xN)
(optional) TT-TREF [seconds]. Default is %CL_TT_TREF. (1xN or 1x1)
(optional, string) Name of the output frame. Can be "EOD" or "ECI". Default is "ECI" (1x1)
(optional, string) Name of model. "med", "high" or "ELP". Default is "med". (1x1)
Earth-Moon position vector in output frame [m] (3xN)
Earth-Moon velocity vector in output frame [m/s] (3xN)
Astronomical Algorithms J.Meeus - Second edition 1998, Chapter 47
LUNAR SOLUTION ELP version ELP/MPP02 - Jean CHAPRONT and Gerard FRANCOU Observatoire de Paris - SYRTE department - UMR 8630/CNRS - October 2002
CNES - DCT/SB