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SuperNOVAS: src/orbital.c File Reference

Date

Created on Mar 6, 2025

Function relating to the use of orbital elements

Sets the orientation of an orbital system using the RA and DEC coordinates of the pole of the Laplace (or else equatorial) plane relative to which the orbital elements are defined. Orbital parameters of planetary satellites normally include the R.A. and declination of the pole of the local Laplace plane in which the Keplerian orbital elements are referenced.

The system will become referenced to the equatorial plane, the relative obliquity is set to (90° - dec), while the argument of the ascending node ('Omega') is set to (90° + ra).

NOTES:

1. You should not expect much precision from the long-range orbital approximations for planetary satellites. For applications that require precision at any level, you should rely on appropriate ephemerides, or else on up-to-date short-term orbital elements.

Parameters

type Coordinate reference system in which ra and dec are defined (e.g. NOVAS_GCRS). ra [h] the R.A. of the pole of the oribtal reference plane. dec [deg] the declination of the pole of the oribtal reference plane. [out] sys Orbital system

Returns

0 if successful, or else -1 (errno will be set to EINVAL) if the output sys pointer is NULL.

Author

Attila Kovacs

Since

1.2

See also

make_orbital_object()

References NOVAS_EQUATORIAL_PLANE, and NOVAS_TIRS.

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