simIncludeGravBody

class simIncludeGravBody.gravBodyFactory(bodyNames=None)

Bases: object

Factory cass to create gravitational bodies.

createBodies(bodyNames)

A convenience function to create multiple typical solar system bodies.

Parameters

bodyNames (array_like) – Planet name strings. Each planet name must be a valid SPICE celestial body string.

Returns

gravBodies – A list of gravity body objects held by the gravity factory.

Return type

array_like

createCustomGravObject(label, mu, **kwargs)

Create a custom gravity body object.

Parameters

• label (string) – Gravity body name

• mu (double) – Gravity constant

• kwargs –

  radEquatordouble

  Equatorial radius in meters

  radiusRatiodouble

  Ratio of the polar radius to the equatorial radius.

createEarth()

Create gravity body with Earth mass properties.

createJupiter()

Create gravity body with Jupiter mass properties.

createMars()

Create gravity body with Mars mass properties.

createMarsBarycenter()

Create gravity body with Mars mass properties.

createMercury()

Create gravity body with Mercury mass properties.

createMoon()

Create gravity body with Moon mass properties.

createNeptune()

Create gravity body with Neptune mass properties.

createSaturn()

Create gravity body with Saturn mass properties.

createSpiceInterface(path, time, **kwargs)

A convenience function to configure a NAIF Spice module for the simulation. It connect the gravBodyData objects to the spice planet state messages. Thus, it must be run after the gravBodyData objects are created.

Parameters

• path (string) – The absolute path to the Basilisk source directory (default ‘’).

• time (string) – The time string.

• kwargs –

  spiceKernalFileNames :

  A list of spice kernel file names including file extension.

  spicePlanetNames :

  A list of planet names whose Spice data is loaded, overriding the gravBodies list.

  spicePlanetFrames :

  A list of strings for the planet frame names. If left empty for a planet, then IAU_ + planetName is assumed for the planet frame.

  epochInMsg: bool

  Flag to set an epoch input message for the spice interface

createSun()

Create gravity body with sun mass properties.

createUranus()

Create gravity body with Uranus mass properties.

createVenus()

Create gravity body with Venus mass properties.

unloadSpiceKernels()

Method to unload spice kernals at the end of a simulation.

simIncludeGravBody.loadGravFromFile(fileName, spherHarm, maxDeg=2)

Load the gravitational body spherical harmonics coefficients from a file.

Parameters

• fileName (string) – The full path to the specified data file.

• spherHarm – The spherical harmonics container of the gravity body.

• maxDeg (integer) – maximum degree of spherical harmonics to load

Notes

This function is a convenience utility for loading in the spherical harmonics coefficients from a data file. The default harmonic degree is 2 unless specified. Note that this function calls the gravityEffector function loadGravFromFile().