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Hi Liz
Its easy if you can edit the ssystem.ini file without making any mistakes.
What comet do you want the data may already be available. If you have discovered a new one give me the coords of three sightings and I will give you its orbital parameters.
If you check out the stellarium wiki you will find data on lots of comets ready for insertion into the ssystem.ini file
The only real problem is the eventual size of the ssystem.ini needs to be less than 20KB or stellarium will be significantly slowed. but thats a lot of comets.
Barry
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