stargen

Documentation

Index

• Constants
• Variables
• func AVE(x, y float64) float64
• func GenerateStellarSystem(randomTilt bool, doMoons bool, doGases bool) (*types.Sun, []*types.Planet)
• func NewRandomSun() *types.Sun
• func NewSun(mass float64) *types.Sun
• type AccretionProcessor
  • func NewAccretionProcessor() *AccretionProcessor
  • func (accretionProcessor *AccretionProcessor) DistPlanetaryMasses(stellarMassRatio, stellarLuminosityRatio, innerDust, outerDust, ... float64, ...)
  • func (accretionProcessor *AccretionProcessor) StellarDustLimit(stellarMassRatio float64) float64
• type DustBand
  • func (dustBand *DustBand) String() string
• type HabitableZoneMode
• type PlanetEnvironment
  • func NewPlanetEnvironment() *PlanetEnvironment
  • func (planetEnvironment *PlanetEnvironment) GeneratePlanet(sun *persistence.Sun, planet *persistence.Planet, randomTilt bool, ...)
• type StellarClass
  • func RandStellarClass() *StellarClass

Constants

const (
	K                       float64 = 50.0     //K = gas/dust ratio
	B                       float64 = 1.2E-5   //Used in Crit_mass calc
	N                       float64 = 3.0      // Used in density calcs
	Alpha                   float64 = 5.0      // Used in density calcs
	ProtoPlanetMass         float64 = 1.0e-15  // Units of solar masses
	EccentricityCoefficient float64 = 0.077    /* Dole's was 0.077			*/
	ChangeInErthAngVel      float64 = -1.3E-15 /* Units of radians/sec/year*/
	DustDensityCoefficient  float64 = 2.0e-3   /* A in Dole's paper		*/

	IceDensity    float64 = 1.46
	CarbonDensity float64 = 3.22
	RockDensity   float64 = 4.7825
	IronDensity   float64 = 7.874

	GasRetentionThreshold float64 = 6.0 /* ratio of esc vel to RMS vel */

	AsteroidMassLimit    float64 = 0.001 /* Units of Earth Masses	*/
	SunMassInEarthMasses float64 = 332775.64
	SolarMassInGrams     float64 = 1.989e33 /* Units of grams			*/

	EarthRadius              float64 = 6.378e8  /* Units of cm				*/
	EarthRadiusInKM          float64 = 6378.0   /* Units of km				*/
	EarthDensity             float64 = 5.52     /* Units of g/cc			*/
	EarthMassInGrams         float64 = 5.977e27 /* Units of grams			*/
	EarthExosphereTemp       float64 = 1273.0   /* Units of degrees Kelvin	*/
	EarthAcceleration        float64 = 980.7    /* Units of cm/sec2			*/
	EarthAxialTilt           float64 = 23.4     /* Units of degrees*/
	EarthAverageCelsius      float64 = 14.0     /* Average Earth Temperature */
	EarthAverageKelvin       float64 = EarthAverageCelsius + FreezingPointOfWater
	EarthEffectiveTemp       float64 = 250.0   /* Units of degrees Kelvin (was 255)	*/
	EarthConvectionFactor    float64 = 0.43    /* from Hart, eq.20			*/
	EarthWaterMassPerArea    float64 = 3.83e15 /* grams per square km		*/
	EarthSurfPersInMMHG      float64 = 760.0   /* Dole p. 15 */
	EarthSurfPersInMilliBars float64 = 1013.25
	DaysInAYear              float64 = 365.256  /* Earth days per Earth year*/
	CloudCoverageFactor      float64 = 1.839e-8 /* Km^2/kg					*/

	MaxSunAge float64 = 6e9
	MinSunAge float64 = 1e9

	EarthAlbedo             float64 = 0.33 /* was .33 for a while */
	IceAlbedo               float64 = 0.7
	CloudAlbedo             float64 = 0.52
	AirlessIceAlbedo        float64 = 0.5
	GreenhouseTriggerAlbedo float64 = 0.2
	RockyAlbedo             float64 = 0.15
	RockyAirlessAlbedo      float64 = 0.07
	WaterAlbedo             float64 = 0.04
	GasGiantAlbedo          float64 = 0.5 /* albedo of a gas giant	*/
	CarbonGiantAlbedo       float64 = 0.01
	SulfarGiantAlbedo       float64 = 0.63
	MethaneGiantAlbedo      float64 = 0.3

	TemperatureCarbonGiant   float64 = 2240.0
	TemperatureClassVGiant   float64 = 1400.0
	TemperatureClassIVGiant  float64 = 900.0
	TemperatureClassIIIGiant float64 = 360.0
	TemperatureSulfarGiant   float64 = 320.0
	TemperatureClassIIGiant  float64 = 150.0
	TemperatureClassIGiant   float64 = 81.0

	FreezingPointOfWater float64 = 273.15 /* Units of degrees Kelvin	*/
	MilliBarsPerBar      float64 = 1000.0

	GravityConstant float64 = 6.672E-8 /* units of dyne cm2/gram2	*/
	MolarGasConst   float64 = 8314.41  /* units: g*m2/(sec2*K*mol) */
	J               float64 = 1.46E-19 /* Used in day-length calcs (cm2/sec2 g) */
	SecondsPerHour  float64 = 3600.0

	CMPerAU    float64 = 1.495978707e13 /* number of cm in an AU	*/
	CMPerKM    float64 = 1.0e5          /* number of cm in a km		*/
	KMPerAU    float64 = CMPerAU / CMPerKM
	CMPerMeter float64 = 100.0

	/*	Now for a few molecular weights (used for RMS velocity calcs):	   */
	/*	This table is from Dole's book "Habitable Planets for Man", p. 38  */
	AtomicHydrogen   float64 = 1.0   /* H   */
	MolHydrogen      float64 = 2.0   /* H2  */
	Helium           float64 = 4.0   /* He  */
	AtomicNitrogen   float64 = 14.0  /* N   */
	AtomicOxygen     float64 = 16.0  /* O   */
	Methane          float64 = 16.0  /* CH4 */
	Ammonia          float64 = 17.0  /* NH3 */
	WaterVapro       float64 = 18.0  /* H2O */
	Neon             float64 = 20.2  /* Ne  */
	MolNitrogen      float64 = 28.0  /* N2  */
	CarbonMonoxide   float64 = 28.0  /* CO  */
	NitricOxide      float64 = 30.0  /* NO  */
	MolOxygen        float64 = 32.0  /* O2  */
	HydrogenSulphide float64 = 34.1  /* H2S */
	Argon            float64 = 39.9  /* Ar  */
	CarbonDioxide    float64 = 44.0  /* CO2 */
	NitrousOxide     float64 = 44.0  /* N2O */
	NitrogenDioxide  float64 = 46.0  /* NO2 */
	Ozone            float64 = 48.0  /* O3  */
	SulphDioxide     float64 = 64.1  /* SO2 */
	SulphTrioxode    float64 = 80.1  /* SO3 */
	Krypton          float64 = 83.8  /* Kr  */
	Xenon            float64 = 131.3 /* Xe  */

	// Jupiter
	JupiterMass   float64 = 317.8   /* mass of Jupiter in Earth Masses */
	JupiterRadius float64 = 69911.0 /* average radius of Jupiter in km */

	/*	The following defines are used in the kothari_radius function in	*/
	A1_20     float64 = 6.485e12  /* All units are in cgs system.	 */
	A2_20     float64 = 4.0032e-8 /*	 ie: cm, g, dynes, etc.		 */
	Beta20    float64 = 5.71e12
	JimsFudge float64 = 1.004

	/*	 The following defines are used in determining the fraction of a planet	 */
	/*	covered with clouds in function cloud_fraction in file enviro.c.		 */
	Q1_36 float64 = 1.258e19 /* grams	*/
	Q2_36 float64 = 0.0698   /* 1/Kelvin */

	H2OAssumedPressure float64 = 47.0 * MMHG2MilliBars /* Dole p. 15      */
	PPMPressure        float64 = EarthSurfPersInMilliBars / 1000000.0
	MMHG2MilliBars     float64 = EarthSurfPersInMilliBars / EarthSurfPersInMMHG
)

Variables

var (
	GasDwarfRadiusX = []float64{}/* 106 elements not displayed */

	GasDwarfRadiusY = []float64{}/* 106 elements not displayed */

)

var StellarClassification []*StellarClass = []*StellarClass{
	&StellarClass{
		Class:       "O",
		Color:       255,
		Mass:        mathf.NewRange(16.0, 120.0),
		Radius:      mathf.NewRange(6.6, math.MaxFloat64),
		Temperature: mathf.NewRange(30, 50),
		Luminosity:  mathf.NewRange(30000, math.MaxFloat64),
	},
	&StellarClass{
		Class:       "B",
		Color:       10079487,
		Mass:        mathf.NewRange(2.1, 16.0),
		Radius:      mathf.NewRange(1.8, 6.6),
		Temperature: mathf.NewRange(10, 30),
		Luminosity:  mathf.NewRange(25, 30000),
	},
	&StellarClass{
		Class:       "A",
		Color:       16777215,
		Mass:        mathf.NewRange(1.4, 2.1),
		Radius:      mathf.NewRange(1.4, 1.8),
		Temperature: mathf.NewRange(7.5, 10),
		Luminosity:  mathf.NewRange(5, 25),
	},
	&StellarClass{
		Class:       "F",
		Color:       16777164,
		Mass:        mathf.NewRange(1.04, 1.4),
		Radius:      mathf.NewRange(1.15, 1.4),
		Temperature: mathf.NewRange(6, 7.5),
		Luminosity:  mathf.NewRange(1.5, 5),
	},
	&StellarClass{
		Class:       "G",
		Color:       16776960,
		Mass:        mathf.NewRange(0.8, 1.04),
		Radius:      mathf.NewRange(0.96, 1.15),
		Temperature: mathf.NewRange(5.2, 6.0),
		Luminosity:  mathf.NewRange(0.6, 1.5),
	},
	&StellarClass{
		Class:       "K",
		Color:       16761446,
		Mass:        mathf.NewRange(0.45, 0.8),
		Radius:      mathf.NewRange(0.7, 0.96),
		Temperature: mathf.NewRange(3.7, 5.2),
		Luminosity:  mathf.NewRange(0.08, 0.6),
	},
	&StellarClass{
		Class:       "M",
		Color:       13395456,
		Mass:        mathf.NewRange(0.08, 0.45),
		Radius:      mathf.NewRange(0.0, 0.7),
		Temperature: mathf.NewRange(2.4, 3.7),
		Luminosity:  mathf.NewRange(0.0, 0.08),
	},
}

Functions

func AVE

func AVE(x, y float64) float64

func GenerateStellarSystem

func GenerateStellarSystem(randomTilt bool, doMoons bool, doGases bool) (*types.Sun, []*types.Planet)

func NewRandomSun

func NewRandomSun() *types.Sun

func NewSun

func NewSun(mass float64) *types.Sun

Types

type AccretionProcessor

type AccretionProcessor struct {
	CloudEccentricity float64
	Planets           *list.List
	DustBands         *list.List
}

func NewAccretionProcessor

func NewAccretionProcessor() *AccretionProcessor

func (*AccretionProcessor) DistPlanetaryMasses

func (accretionProcessor *AccretionProcessor) DistPlanetaryMasses(stellarMassRatio, stellarLuminosityRatio, innerDust, outerDust, outerPlanetLimit, dustDensityCoefficient float64, doMoons bool)

func (*AccretionProcessor) StellarDustLimit

func (accretionProcessor *AccretionProcessor) StellarDustLimit(stellarMassRatio float64) float64

type DustBand

type DustBand struct {
	InnerEdge   float64
	OuterEdge   float64
	DustPresent bool
	GasPresent  bool
}

func (*DustBand) String

func (dustBand *DustBand) String() string

type HabitableZoneMode

type HabitableZoneMode string

const (
	RecentVenus               HabitableZoneMode = "recent-venus"
	RunawayGreenhouse         HabitableZoneMode = "runaway-greenhouse"
	MoistGreenhouse           HabitableZoneMode = "moist-greenhouse"
	EarthLike                 HabitableZoneMode = "earth-like"
	FirstCO2CondensationLimit HabitableZoneMode = "first-co2"
	MaximumGreenhouse         HabitableZoneMode = "max-greenhouse"
	EarlyMars                 HabitableZoneMode = "early-mars"
	TwoAUCloudLimit           HabitableZoneMode = "two-au"
)

type PlanetEnvironment

type PlanetEnvironment struct{}

func NewPlanetEnvironment

func NewPlanetEnvironment() *PlanetEnvironment

func (*PlanetEnvironment) GeneratePlanet

func (planetEnvironment *PlanetEnvironment) GeneratePlanet(sun *persistence.Sun, planet *persistence.Planet, randomTilt bool, doMoons, doGases, isMoon bool)

type StellarClass

type StellarClass struct {
	Class       string
	Color       int64
	Mass        *mathf.Range
	Radius      *mathf.Range
	Temperature *mathf.Range
	Luminosity  *mathf.Range
}

func RandStellarClass

func RandStellarClass() *StellarClass