KRC for Asteroids

Notes

Basalt is the default material for asteroids (Mat = "basalt"), and T_user = 220 (temperature at which the inertia is defined). TI_CO = 1200 (transition TI from particulated behavior to continuous behavior).

Orbital parameters have already been processed for some asteroids:

Annefrank

Bennu

Braille

Ceres

Gaspra

Itokawa

Lutetia

Mathilde

Pallas

Vesta

For these bodies, directly run KRC using the body's name as follow:

body = "minor,BODY_NAME"

For example:

out = krc(lat = 0., INERTIA = 50., T_user = 220., LKofT = "T", body = "minor,Bennu", ls = 0.)

For other bodies -not in the list above-, the user needs to generate the rotational matrix. First, 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 asceding node in degrees (Default=0)

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

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

rot_per: siderial 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")

Then run KRC using this new body as the "body", and indicate bodytype = "minor":

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

This case predict surface temperature for a new body named "IdealJupiterTrojan".

Surface Temperature for an Ideal Trojan whose orbital parameters are specified ("Trojan with Sun"), as well as the same body with a warmer Sun (SOLCON = 2722.)