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SuperNOVAS: novas_orbital Struct Reference

Keplerian orbital elements for NOVAS_ORBITAL_OBJECT type. Orbital elements can be used to provide approximate positions for various Solar-system bodies. JPL publishes orbital elements (and their evolution) for the major planets and their satellites. However, these are suitable only for very approximate calculations, with up to degree scale errors for the gas giants for the time range between 1850 AD and 2050 AD. Accurate positions and velocities for planets and their satellites should generally require the use of precise ephemeris data instead, such as obtained from the JPL Horizons system.

Orbital elements describe motion from a purely Keplerian perspective. However, for short periods, for which the perturbing bodies can be ignored, this description can be quite accurate provided that an up-to-date set of values are used. The Minor Planet Center (MPC) thus regularly publishes orbital elements for all known asteroids and comets. For such objects, orbital elements can offer precise, and the most up-to-date positions and velocities.

REFERENCES:

1. Up-to-date orbital elements for asteroids, comets, etc from the Minor Planet Center (MPC): https://minorplanetcenter.net/data
2. Mean elements for planetary satellites from JPL Horizons: https://ssd.jpl.nasa.gov/sats/elem/
3. Low accuracy mean elements for planets from JPL Horizons: https://ssd.jpl.nasa.gov/planets/approx_pos.html

Since

1.2

See also

object

enum NOVAS_ORBITAL_OBJECT

NOVAS_ORBIT_INIT

[deg/day] mean daily motion, i.e. (GM/_a_³)^1/2 for the central body, or 360/T, where T is orbital period in days.

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