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Forum » SpaceEngine » Mods and Addons » How do i create a comet?
How do i create a comet?
JonahrfDate: Tuesday, 17.12.2013, 16:57 | Message # 1
Space Tourist
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United States
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I would like to know what the comet parameters mean.
I also would like to add fantastic tails

Edited by Jonahrf - Wednesday, 18.12.2013, 03:25
 
WatsisnameDate: Tuesday, 17.12.2013, 22:42 | Message # 2
Galaxy Architect
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To create a comet, just duplicate one of the entries in comets.sc and change the name and parameters.

ParentBody: What object the comet is orbiting.
CometType: Periodic "P" or nonperiodic "C"
Radius: in km. Not needed if using magnitude / slope parameter instead.
Mass: in kg, divided by mass of Earth (6x1024kg). Not needed if using magnitude / slope parameter instead.
RotationPeriod: Time to complete one rotation, in hours I believe.
AbsMagn: Comet's intrinsic brightness, more negative is brighter.
SlopeParam: Describes how brightness changes as a function of distance from sun.

Orbital Parameters. See wikipedia page if you have further questions.
Epoch: Julian date at which the orbital elements are specified.
Period: Time to complete one orbit in years. Very large for nonperiodic comets, and not used for hyperbolic comes (e.g. ISON)
Eccentricity:Non-circularity of orbit. 0 for circle, 1 for parabola.
Inclination: Tilt of orbit with respect to reference plane, in degrees.
AscendingNode: Defines point where orbit crosses reference plane in northward direction, in degrees.
ArgOfPericenter: Defines point of periapsis, in degrees.
MeanAnomaly: Position of comet with respect to periapsis at the specified time, in degrees.

Tail parameters are pretty self explanatory I think.



 
DeathStarDate: Wednesday, 18.12.2013, 00:39 | Message # 3
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Croatia
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Quote Watsisname ()
SlopeParam: Describes how brightness changes as a function of distance from sun.


Wow, I didnt know that! That is why all of my sungrazer comets disappeared so quickly, because I defined SlopeParam as 4.
 
HarbingerDawnDate: Wednesday, 18.12.2013, 01:04 | Message # 4
Cosmic Curator
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United States
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Quote DeathStar ()
That is why all of my sungrazer comets disappeared so quickly, because I defined SlopeParam as 4.

Actually it's because SE doesn't properly calculate tail length, so sungrazers will only have long tails at perihelion, and be invisible at other times. I doubt there are any SlopeParam values you could use to get a realistic appearance for sungrazers.



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