naif.c File Reference

Macros
#define	__NOVAS_INTERNAL_API__
	Use definitions meant for internal use by SuperNOVAS only.

Functions
enum novas_planet	naif_to_novas_planet (long id)
long	novas_to_dexxx_planet (enum novas_planet id)
long	novas_to_naif_planet (enum novas_planet id)

Detailed Description

Date

Created on Nov 6, 2024

Author

Attila Kovacs

Solar system ID mappings between NOVAS and NASA's Navigation and Ancillary Information Facility (NAIF), which is used by the JPL ephemeris systems. The two differ for the numbering convention for major planets, the Sun, Moon, Solar-System Barycenter (SSB) and the Earth-Moon Barycenter (EMB). NOVAS does not have predefined IDs beyond this set (and no defined ID for EMB), thus for all other objects we'll assume and use NOVAS IDs that match NAIF.

Since

1.2

See also

solsys-calceph.c

solsys-cspice.c

Function Documentation

naif_to_novas_planet()

enum novas_planet naif_to_novas_planet

(

long

id

)

Converts a NAIF ID to a NOVAS major planet ID. It account for the different IDs used for Sun, Moon, SSB, EMB and the Pluto system. Otherwise NAIF planet barycenters are mapped to the corresponding bodies. NAIF body centers n99 (e.g. 399 for Earth) are mapped to the corresponding NOVAS planet number n. All other NAIF IDs will return -1, indicating no match to a NOVAS planet ID.

Parameters

id	The NAIF ID of the major planet of interest

Returns

the NOVAS ID for the same object (which may or may not be different from the input), or -1 if the NAIF ID cannot be matched to a NOVAS major planet.

See also

novas_to_naif_planet()

novas_to_dexxx_planet()

Author

Attila Kovacs

Since

1.2

References NOVAS_EMB, NOVAS_MERCURY, NOVAS_MOON, NOVAS_PLUTO, NOVAS_PLUTO_BARYCENTER, NOVAS_SSB, and NOVAS_SUN.

novas_to_dexxx_planet()

long novas_to_dexxx_planet

(

enum novas_planet

id

)

Converts a NOVAS Solar-system body ID to a NAIF Solar-system body ID for DExxx ephemeris files. The DExxx (e.g. DE440) ephemeris files use NAIF IDs, but for most planets contain barycentric data only rather than that of the planet center. For Earth-based observations, it only really makes a difference whether the 3 is used for the Earth-Moon Barycenter (EMB) or 399 for the geocenter.

Parameters

id	The NOVAS ID of the major planet of interest

Returns

the NAIF ID for the same object (which may or may not be different from the input), as appropriate for use in the DExxx ephemeris files.

See also

novas_to_naif_planet()

naif_to_novas_planet()

Author

Attila Kovacs

Since

1.2

References NOVAS_EARTH, NOVAS_EMB, NOVAS_MERCURY, NOVAS_MOON, NOVAS_PLUTO, NOVAS_PLUTO_BARYCENTER, NOVAS_SSB, and NOVAS_SUN.

novas_to_naif_planet()

long novas_to_naif_planet

(

enum novas_planet

id

)

Converts a NOVAS Solar-system body ID to a NAIF Solar-system body ID. NOVAS and NAIF use slightly different IDs for major planets, the Moon, SSB, EMB, and the Pluto system. In NOVAS, major planets are have IDs ranging from 1 through 9, but for NAIF 1–9 are the planetary barycenters and the planet centers have numbers in the hundreds ending with 99 (e.g. the center of Earth is NAIF 399; 3 is the NOVAS ID for Earth and the NAIF ID for the Earth-Moon Barycenter [EMB]). The Sun and Moon also have distinct IDs in NAIF vs NOVAS.

Parameters

id	The NOVAS ID of the major planet of interest

Returns

the NAIF ID for the same object or planet center (which may or may not be different from the input)

See also

naif_to_novas_planet()

Author

Attila Kovacs

Since

1.2

References NOVAS_EMB, NOVAS_MERCURY, NOVAS_MOON, NOVAS_PLUTO, NOVAS_PLUTO_BARYCENTER, NOVAS_SSB, and NOVAS_SUN.