Overview of data available in CelestLab
These data consist of physical quantities and other constants.
They are defined in 4 files in the CL_home()/data directory.
The contents of the files can be accessed by: "CelestLab" menu -> "Data files (predefined variables)"
Each file is self-documented and contains a description and references.
physical_data.scd :
General physical data such as data related to Earth gravity, rotation rate of the Earth, speed of light, astronomical unit, etc ...
solar_system_data.scd :
equatorial radius, oblateness and gravitational constants of solar system bodies.
time_data.scd :
offsets between various time scales (including the leap seconds between TAI and UTC).
constants.scd :
miscellaneous data that should not be modifed.
These data can be retrieved by the function CL_dataGet.
It is also possible to bring some useful (local) variables into existence (commonly used quantities or conversion
factors, values of optional arguments). See CL_init.
Earth gravity potential data are available in the CL_home()/data/potential directory.
There is only one file available: EGM96s potential.
The file is a ".scd" file (Scilab syntax); the original data come from: http://icgem.gfz-potsdam.de/ICGEM.
Ephemerides data are available in the CL_home()/data/ephem directory.
de405 directory:
contains DE405 ephemerides files. These files are in binary format and are specific to CelestLab.
They have been built from ASCII files, available at the following URL: ftp://ssd.jpl.nasa.gov/pub/eph/planets/ascii.
Period covered in default CelestLab installation: [2000-2200].
These data are used by the function CL_eph_de405.
VSOP87_series directory:
contains VSOP87 series data. These files are in binary format and are specific to CelestLab.
They have been built from ASCII files, available at the following URL: ftp://ftp.imcce.fr/pub/ephem/planets/vsop87.
These data are used by the function CL_eph_planet.
elp_mpp02.dat :
contains ELP/MPP02 series data. These files are in a binary format and are specific to CelestLab.
They have been built from ASCII files, available at the following URL: ftp://cyrano-se.obspm.fr/pub/2_lunar_solutions/2_elpmpp02/.
These data are used by the function CL_eph_moon.
Geographical data are available in the CL_home()/data/earthMap directory.
earthMap_xxx.dat files:
contains Earth maps (outlines of continents, islands and lakes) in various coordinates and resolutions.
These data are used by the function CL_plot_earthMap.
info_land_ratio.dat :
contains data associated to Earth locations. The data represent the percentage of land in a 0.25 deg^2 area around the location.
They are used by the function CL_locationInfo.
These data are available in the CL_home()/data/frame directory. They are used by the frame conversion functions CL_fr_convert and CL_fr_convertMat.
IERS series:
Series for X, Y, s+XY/2 (for the CIP and CIO coordinates), psi (nutation in longitude) and eps (nutation in obliquity).
The file format is CelestLab specific (binary format).
The original data come from: http://www.iers.org.
Precomputed data:
Data (X,Y,s) used for the GCRS to CIRS frame transformation to speed-up the process. The data are sampled with a time step of 0.5 day and can be interpolated. The preferred degree for the interpolating polynomials is 5.
The files cover the period [2000-2100].
These data are available in the CL_home()/data/environment directory. They are used by various physical models.
igrf11.dat:
Data for the computation of the magnetic field (IGRF11 model).
The file format is CelestLab specific (binary format).
The original data come from: http://www.ngdc.noaa.gov/IAGA/vmod/igrf.html.
These data are used by the function CL_mod_geomagField.
These data are available in the CL_home()/data/force_models directory. They are used by various force models.
acc_albedo.dat:
Data for the computation of the acceleration caused by the reflected solar pressure (albedo).
The file format is CelestLab specific (binary format).
These data are used by the function CL_fo_albedoAcc.