CelestialBodyLoader
public class JPLEphemeridesLoader extends Object implements CelestialBodyLoader
JPL ephemerides binary files contain ephemerides for all solar system planets.
The JPL ephemerides binary files are recognized thanks to their base names,
which must match the pattern [lu]nx[mp]####.ddd
(or
[lu]nx[mp]####.ddd.gz
for gzip-compressed files) where # stands for a
digit character and where ddd is an ephemeris type (typically 405 or 406).
The loader supports files encoded in big-endian as well as in little-endian notation.
Usually, big-endian files are named unx[mp]####.ddd
, while little-endian files
are named lnx[mp]####.ddd
.
The IMCCE ephemerides binary files are recognized thanks to their base names,
which must match the pattern inpop*.dat
(or
inpop*.dat.gz
for gzip-compressed files) where * stands for any string.
The loader supports files encoded in big-endian as well as in little-endian notation.
Usually, big-endian files contain bigendian
in their names, while little-endian files
contain littleendian
in their names.
The loader supports files in TDB or TCB time scales.
Modifier and Type | Class | Description |
---|---|---|
static class |
JPLEphemeridesLoader.EphemerisType |
List of supported ephemerides types.
|
static interface |
JPLEphemeridesLoader.RawPVProvider |
Interface for raw position-velocity retrieval.
|
Modifier and Type | Field | Description |
---|---|---|
static String |
DEFAULT_DE_SUPPORTED_NAMES |
Default supported files name pattern for JPL DE files.
|
static String |
DEFAULT_INPOP_SUPPORTED_NAMES |
Default supported files name pattern for IMCCE INPOP files.
|
Constructor | Description |
---|---|
JPLEphemeridesLoader(String supportedNames,
JPLEphemeridesLoader.EphemerisType generateType) |
Create a loader for JPL ephemerides binary files.
|
Modifier and Type | Method | Description |
---|---|---|
double |
getLoadedAstronomicalUnit() |
Get astronomical unit.
|
double |
getLoadedConstant(String... names) |
Get a constant defined in the ephemerides headers.
|
double |
getLoadedEarthMoonMassRatio() |
Get Earth/Moon mass ratio.
|
double |
getLoadedGravitationalCoefficient(JPLEphemeridesLoader.EphemerisType body) |
Get the gravitational coefficient of a body.
|
double |
getMaxChunksDuration() |
Get the maximal chunks duration.
|
CelestialBody |
loadCelestialBody(String name) |
Load celestial body.
|
public static final String DEFAULT_DE_SUPPORTED_NAMES
public static final String DEFAULT_INPOP_SUPPORTED_NAMES
public JPLEphemeridesLoader(String supportedNames, JPLEphemeridesLoader.EphemerisType generateType) throws OrekitException
supportedNames
- regular expression for supported files namesgenerateType
- ephemeris type to generateOrekitException
- if the header constants cannot be readpublic CelestialBody loadCelestialBody(String name) throws OrekitException
loadCelestialBody
in interface CelestialBodyLoader
name
- name of the celestial bodyOrekitException
- if the body cannot be loadedpublic double getLoadedAstronomicalUnit() throws OrekitException
OrekitException
- if constants cannot be loadedpublic double getLoadedEarthMoonMassRatio() throws OrekitException
OrekitException
- if constants cannot be loadedpublic double getLoadedGravitationalCoefficient(JPLEphemeridesLoader.EphemerisType body) throws OrekitException
body
- body for which the gravitational coefficient is requestedOrekitException
- if constants cannot be loadedpublic double getLoadedConstant(String... names) throws OrekitException
Note that since constants are defined in the JPL headers files, they are available as soon as one file is available, even if it doesn't match the desired central date. This is because the header must be parsed before the dates can be checked.
There are alternate names for constants since for example JPL names are different from INPOP names (Sun gravity: GMS or GM_Sun, Mars gravity: GM4 or GM_Mar...).
names
- alternate names of the constantOrekitException
- if constants cannot be loadedpublic double getMaxChunksDuration()
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