KRC for Exoplanets

Revision as of 15:31, 26 May 2021

A user can define the orbital parameters of any body rotating around any star. PORB generates the rotation matrix accordingly.

Two approaches exist: one most suited for bodies where the orbital parameters are very precisely known, and one with more generic orbital parameters.

Option 1

Run PORB to create a structure that can be ingested to generate the orbital rotation matrix. The following arguments are needed:

e: Eccentricity (Default=0)

a: Semi-Major Axis in AU (Default=1)

i: Inclination of mean orbit to ecliptic in degrees (Default=0)

node: Longitude of the ascending node in degrees (Default=0)

per: Argument of perihelion in degrees (Default=0)

m: Mean Anomaly at epoch in degrees (Default=0)

rot_per: sideral rotation period in hours (Default=23.9345)

polera: Right Ascension of the pole in degrees (Default=0)

merid: Prime meridian at epoch in degrees (Default=0)

poledec: Declination of the pole in degrees (Default=0)

period: Sideral orbital period in Earth days (Default=365.256)

name: Body name (default ="None")

Then run generic_porb() with these arguments, for example:

tmp = generic_porb(e=0,a=1.,i=1.3,node=100.4,peri=293.9,m=79.6,rot_per=200.,polera=273.8,poledec=0.,merid=7.7, period=4332.5,name="IdealJupiterTrojan")

Option 2

Run PORB to create a structure that can be ingested to generate the orbital rotation matrix. The following arguments are needed:

name: Body name (default ="None")

Vismag: Visual Magnitude of host star; used to derive a correction factor for SOLCON. 0 is recommended, and set SOLCON

epoch: Time of periastron as full Julian date ; 2000 Jan 1 noon UTC= 2451545.0

DisEarth: Distance from Earth to host star, in lightyears. 0 is recommended, and set SOLCON

a: Semi-Major Axis in AU (Default=1)

period: Sideral orbital period in Earth days (Default=365.256)

e: Eccentricity (Default=0)

Obliq: Obliquity of planet pole, in degree

Lsperi: Season (Ls) at periastron, in degree

rot_per: sideral rotation period in hours (Default=23.9345)

Then run KRC using this new body as the "body":

out = krc(lat=0.,lon=0,INERTIA=20.,ALBEDO=.05,LKofT="F",body=tmp)

This case above assumes the Sun as the central star. Any star can be defined by setting SOLCON (solar constant defined as the total stellar irradiance at 1AU in W/m^2. In the solar system, SOLCON ~ 1,361 W/m2.

out = krc(lat=0.,lon=0,INERTIA=20.,ALBEDO=.05,LKofT="F",body=tmp,SOLCON=2722.)

The case above assumes a start outputting twice as much energy as the Sun ("Super Sun").

Example of surface temperatures for airless body around a warm Sun.