Celestia Forums

I want to create a script that displays the locations of exoplanet-host stars, but I never wrote any script in Celestia.

http://www.celestiamotherlode.net/

Lots of useful information including links to documents describing CEL and CELX scripting.

Cheers.

I'm sorry, I realized I need to make some kind of plot of these objects, and not a script. I want to do something like "Galactic Redshift Survey" or "SIRAS PSCz Galaxies" on the motherlode. I haven't found any help on plotting though. Where can I get some?

What do you mean by "plotting"?

Celestia can place markers around objects, if that's what you mean. That can be done with a Cel script.

Or you can write a Lua script to write out information that Celestia has to a file and then use some separate plotting program (Excel, perhaps) to translate that information into an appropriate 2D plot.

.

Well, I want to display the location of ~400 exoplanet-host stars (as dots or actual stars with planets, preferring the latter option) around Earth's location in 3D.

That can be done in Celestia when using a Cel script with a separate command for each object, placing a marker around each one specified by name, which is rather painful,

or by using a CelX script which looks at every star and marks those which have an associated planet.

I have a distinct memory of someone already having written that CelX script, although I don't remember who. Vincent, maybe?

selden wrote:I have a distinct memory of someone already having written that CelX script, although I don't remember who. Vincent, maybe?

Yep!
viewtopic.php?f=9&t=14208

Note that Google returns the above link as its first match using the following key words: celestia+script+mark+stars+exoplanet
http://www.google.fr/#hl=fr&source=hp&q ... abdc2d39f4

Well, since I'm doing this for an important project, I would prefer going through the stars one by one to make sure they're all included (as they're not all in Celestia currently). Also, I looked at the mark-lg celx included in Celestia and I thought I saw some parameters to the mark function ("dso:mark( "green", "disk",10, 1 )" at line 20). Are there any parameters for the mark function in celx, and if yes, what are they?

thefallenghost wrote:Well, since I'm doing this for an important project, I would prefer going through the stars one by one to make sure they're all included (as they're not all in Celestia currently). Also, I looked at the mark-lg celx included in Celestia and I thought I saw some parameters to the mark function ("dso:mark( "green", "disk",10, 1 )" at line 20). Are there any parameters for the mark function in celx, and if yes, what are they?

Well, a celx scripting tutorial is available here: http://en.wikibooks.org/wiki/Celestia/C ... ua_Methods
Well, the script shouldn't be too hard to modify to suit your specific needs.

This still doesn't answer wether or not there are any arguments to the mark function (there doesn't seem to be any on your link).

You may want to try adding some magic words like please and thank you...

Sorry... You're right, Thanks !
I think that the arguments are :
1) Color of the marker
2) Shape of the marker
3) Size of the marker
4) Number:?

However, when I run my script, it returns a fatal error:
In line 6: Argument to find must be a string.

Here is my celx:


Please help!

This is a good start.
Now, the problem is that you're passing the RVstars table as argument to the markRV function.
You actually need to iterate over the elements contained in the table so that the string names
are successively passed as argument to the markRV function:

Thanks! I've made some progress; here's my new script:

However, there seems to be a problem with the last function (timing stars), as Sol is marked instead of the given star (I've tried a couple of different scenarios). Help!

thefallenghost wrote:However, there seems to be a problem with the last function (timing stars), as Sol is marked instead of the given star (I've tried a couple of different scenarios). Help!

This is because "And 10" is not in your star database, so celestia:find returns Sol.
I think that making celestia:find return nil in such a case would be more coherent, though...

Ok, merci!!!

Could someone please tell me how many stars hosting exoplanets there are in Celestia by default?

thefallenghost wrote:Could someone please tell me how many stars hosting exoplanets there are in Celestia by default?

There are 328 stars with exoplanets in the SVN (development) version.
I can provide a list with their names if needed, or better, a script to
extract them from the Celestia star database.

Thanks & wow! How did you put them on the H-R diagram?