Welcome, Guest. Please Login.
Gravity Simulator
11/22/17 at 04:55:01
News: Registration for new users has been disabled to discourage spam. If you would like to join the forum please send me an email with your desired screen name to tony at gravitysimulator dot com.
Home Help Search Login


Pages: 1
Send Topic Print
Extrasolar systems creation (Read 1581 times)
frankuitaalst
Ultimate Member
*****


Great site

Posts: 1507
Gender: male
Extrasolar systems creation
09/30/10 at 11:11:47
 
I'm wondering what's the best way to add some extrasolar systems to the existing "solarsystem.gsim" .  
What I want to do is creating some extrasolarsystems , such as the Gliese systems , in the existing simulation .  
Problem starts with positioning the central star in relation to the sun .  
What's the relation between the RightAscension and Longitude  and the input parameters of Gravsim such as Inclination , Longitude ...Mean Anomaly ?  
The rest may be easy : adding the planets in relation to their own star. Only point : how to interprete the "inclination" ?
Back to top
 
 
Email View Profile   IP Logged
Tony
YaBB Administrator
*****




Posts: 1051
Gender: male
Re: Extrasolar systems creation
Reply #1 - 09/30/10 at 22:55:51
 
Unfortunately there is no easy way to do this.  All the orbital elements are with respect to the ecliptic in Gravity Simulator.  Exosystems will have their own plane.  You're probably going to have to do all the math yourself, and enter the individual x,y,z position and velocity vectors.
 
There's another problem with making two star systems that far from each other.  Gravity Simulator uses double precision variables.  These are 15 digits long.  The highest integer it can count to is 999,999,999,999,999.  The positions of objects in our solar system out to Neptune can expressed to the nearest centimeter.  But farther than that you lose accuracy.  At 10 light years you can only specify a position accurate to 100 meters using double-precision.  Further is even worse.  If you go out a few thousand light years, the orbits start doing weird stuff because of this lack of accuracy.
Back to top
 
 
Email View Profile WWW   IP Logged
EDG
Ultimate Member
*****


oh, crumbs!!!

Posts: 611
Gender: male
Re: Extrasolar systems creation
Reply #2 - 10/01/10 at 10:35:14
 
Why create extrasolar systems relative to the sun in gravsim though? Surely a star that is 20 lightyears away won't have any significant gravitational influence on the sun and its planets?  
 
If you just want to visualise them then Celestia is a much better program to use for that sort of thing (and already has many of the extrasolar systems included).
Back to top
 
 

(formerly known as Mal)
View Profile WWW   IP Logged
frankuitaalst
Ultimate Member
*****


Great site

Posts: 1507
Gender: male
Re: Extrasolar systems creation
Reply #3 - 10/01/10 at 11:19:19
 
Quote from Mal on 10/01/10 at 10:35:14:
Why create extrasolar systems relative to the sun in gravsim though? Surely a star that is 20 lightyears away won't have any significant gravitational influence on the sun and its planets?

If you just want to visualise them then Celestia is a much better program to use for that sort of thing (and already has many of the extrasolar systems included).

Correct , the influence is minimal , but ....having one system one can calculate the dv of the extrasolar star relative to earth or relative to sol , so simulating the "signal" the star gives , which is the basis of the detection of the extrasolar planets ...
Back to top
 
 
Email View Profile   IP Logged
Pages: 1
Send Topic Print