EliteDangerousAlmanac / Astronomy / BodyPhysics

Defined in: dotnet/src/EliteDangerousAlmanac/Astronomy/BodyPhysics.cs:31

What a scanned body weighs, how dense it is, and what it pulls on.

Every calculation reads the figures the scan states, and answers null where the body states none it can use. A journal writes zero for a figure it does not have, so a figure of zero is read as an absent one wherever a calculation needs it above zero.

The maths is ported from the Canonn Research Group's canonn-signals. See ATTRIBUTIONS.md for credit and licence terms.

const GravitationalConstant: double = 6.6743e-11

Defined in: dotnet/src/EliteDangerousAlmanac/Astronomy/BodyPhysics.cs:34

The gravitational constant, in cubic metres a kilogram a second squared.

const KilogramsPerEarthMass: double = 5.972e24

Defined in: dotnet/src/EliteDangerousAlmanac/Astronomy/BodyPhysics.cs:37

One Earth mass in kilograms.

const KilogramsPerSolarMass: double = 1.989e30

Defined in: dotnet/src/EliteDangerousAlmanac/Astronomy/BodyPhysics.cs:40

One solar mass in kilograms.

static BulkDensity(body): double?

Defined in: dotnet/src/EliteDangerousAlmanac/Astronomy/BodyPhysics.cs:65

How dense one body is, in kilograms a cubic metre.

BodyProperties

The body, as a scan states it.

double?

The density, or null where the body states no mass or no radius.

ArgumentNullException

The body is absent.

static HillRadius(body, primary): double?

Defined in: dotnet/src/EliteDangerousAlmanac/Astronomy/BodyPhysics.cs:131

How far one body holds satellites of its own, in metres.

BodyProperties

The body, as a scan states it.

BodyProperties

The body it orbits, as a scan states it.

double?

The radius, or null where either body states too little.

ArgumentNullException

Either body is absent.

static Mass(body): double?

Defined in: dotnet/src/EliteDangerousAlmanac/Astronomy/BodyPhysics.cs:53

What one body weighs, in kilograms.

BodyProperties

The body, as a scan states it.

double?

The mass, or null where the body states neither Earth masses nor solar masses.

A planet states Earth masses and a star states solar masses.

ArgumentNullException

The body is absent.

static PrimaryAngularDiameter(body, primary): double?

Defined in: dotnet/src/EliteDangerousAlmanac/Astronomy/BodyPhysics.cs:156

How wide the body it orbits looks from one body, in degrees.

BodyProperties

The body being looked from, as a scan states it.

BodyProperties

The body being looked at, as a scan states it.

double?

The angular diameter, or null where either body states too little.

ArgumentNullException

Either body is absent.

static RocheLimits(satellite, primary): RocheLimits?

Defined in: dotnet/src/EliteDangerousAlmanac/Astronomy/BodyPhysics.cs:115

Where one body pulls another apart.

BodyProperties

The body being pulled, as a scan states it.

BodyProperties

The body doing the pulling, as a scan states it.

RocheLimits?

The two limits, or null where either body states too little.

ArgumentNullException

Either body is absent.

static RocheLimitsForDensity(primary, satelliteDensityKgM3): RocheLimits?

Defined in: dotnet/src/EliteDangerousAlmanac/Astronomy/BodyPhysics.cs:82

Where one body pulls apart a satellite of a stated density.

BodyProperties

The body doing the pulling, as a scan states it.

double

The satellite's density, in kilograms a cubic metre.

RocheLimits?

The two limits, or null where the primary states no radius or no mass.

ArgumentNullException

The primary is absent.

ArgumentOutOfRangeException

The satellite density is not a finite figure above zero.