More accurate orbits and trajectories

General discussion about Celestia that doesn't fit into other forums.
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chris
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More accurate orbits and trajectories

Post #1by chris » 21.10.2002, 18:50

I spent the weekend improving the oribtal calculations used in Celestia and getting better trajectories for unmanned spacecraft. Here's an image showing Voyager 2 near it's closest approach to Uranus:

http://ennui.shatters.net/gallery/view_photo.php?set_albumName=celestia&id=v2_uranus

The image is very close to the one produced by JPL's solar system simulator. A new (and final!) prerelease of Celestia will be ready in a couple days, and at that time I'll also make a new version of the Voyager add-on available with the improved trajectories. I spent hours just following the Voyager craft, Cassini, and Jupiter . . . The Voyager 1 flyby of Saturn is particularly dramatic.

With the new calculations, I was also able to reproduce the correct path of an eclipse that observed from Athens on 14 Jan 484!

--Chris

billybob884
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Post #2by billybob884 » 21.10.2002, 19:40

i hope this prerelease will include the fixed night side lights
Mike M.

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billybob884
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Post #3by billybob884 » 21.10.2002, 19:51

i hope this prerelease will include the fixed night side lights
Mike M.



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Buzz
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Post #4by Buzz » 21.10.2002, 20:39

Great!!! I'm looking forward to following the Voyagers!

Guest

BCE/CE

Post #5by Guest » 22.10.2002, 20:59

Chris, do you use BCE/CE (BC/AD) dates or -/+ CE dates? (For instance, is the year before 1 year 0 or year -1?

Thanks.

Calculus1

ligth time delay

Post #6by Calculus1 » 22.10.2002, 21:31

Chris, this is impressive!
When do you think you'll add the loop to take account of the light velocity delay ?
That way we will be able to see the phemus of jupiter!
---Paul

Rassilon
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Post #7by Rassilon » 22.10.2002, 21:54

Awsome...My accuracy should improve now that I have a book...a catalouge of all celestial bodies known to man...Kenneth R Lang's Astrophysical Data: Planets and Stars...Includes complete RA and Dec coord inc distance and dimentions of Planetary Nebs, T Tauri Stars, Wolf-Rayent stars, the list goes on and on....
I'm trying to teach the cavemen how to play scrabble, its uphill work. The only word they know is Uhh and they dont know how to spell it!

billybob884
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Post #8by billybob884 » 23.10.2002, 02:05

Rassilon wrote:Awsome...My accuracy should improve now that I have a book...a catalouge of all celestial bodies known to man...Kenneth R Lang's Astrophysical Data: Planets and Stars...Includes complete RA and Dec coord inc distance and dimentions of Planetary Nebs, T Tauri Stars, Wolf-Rayent stars, the list goes on and on....


where did you get this book? it sounds interesting...
Mike M.



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