KRC for Comets

Revision as of 14:31, 10 April 2020

Careful!!! For most comets, the rotation period is not known sufficiently well to be reported. In this case, KRC uses a rotation period of 24h by default.

If the rotation period is known by the user, set it with PERIOD.

For example:

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

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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 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: 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_like_Comet")

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 predict surface temperature for a new body named "IdealJupiterTrojan_like_Comet".