DE430 JPL星历 matlab

The original fortran programs for reading ascii versions of the JPL planetary ephemeris files had a fixed maximum number of 400 for the number of ephemeris constants used in the integration and listed in the header.xxx file for the ephemeris. DE430 uses 572 ephemeris constants, which exceeds the prior maximum number allowed. In this directory, there are two header files included. Use header.430_229 if using an old program with 400 maximum ephemeris constants. The header.430_229 file includes a list of only 229 ephemeris constants, omitting the mass parameters for 343 individual asteroids modeled in the de430 integration. Using this header will only omit the asteroid mass parameters from the binary ephemeris file; position and velocity information will be unaffected. Use header.430_572 if using a program that allows more than 400 ephemeris constants. *********************************************************** Also, this set of files does not include information on TT-TDB which was integrated as part of the de430 development. The TT-TDB information is available in ascii format in the directory de430t.