Comet name disappears when orbit is hyperbolic

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Topic author
Andrew Lowe

Comet name disappears when orbit is hyperbolic

Post #1by Andrew Lowe » 31.03.2004, 21:43

I've just discovered Celestia in the last few weeks, and I want to say thanks to all involved in this great program. It's fantastic! I have one question about comet names. I have no problem displaying the comet name when the orbit is elliptical, but when it is hyperbolic, the name disappears. For instance, the elements below are correct for C/2002 T7 (Linear), and the name does not appear. If, however, I change the eccentricity to less than 1 and enter the corresponding Period, the name does display.

Am I missing something?

Andrew

BTW, I know the texture and mesh are incorrect, but I never zoom in that close anyway.

"C/2002 T7 (Linear)" "Sol"
{
Class "comet"
Texture "asteroid.jpg"
Mesh "asteroid.cms"
Radius 10
RotationPeriod 170

EllipticalOrbit
{
Epoch 2453118.5614 #2004 Apr 23.0614 TT (MPC 50914)
Period 41106.25592 # P = (( q / ( e - 1)) ^ 1.5
PericenterDistance 0.614594
Eccentricity 1.000516
Inclination 160.5833
AscendingNode 94.8588
ArgOfPericenter 157.7368
MeanAnomaly 0
}

}

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selden
Developer
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Location: NY, USA

Post #2by selden » 31.03.2004, 23:28

Celestia v1.3.2pre7 also does not draw the hyperbolic orbit path . :(
Selden

chris
Site Admin
Posts: 4211
Joined: 28.01.2002
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Location: Seattle, Washington, USA

Post #3by chris » 01.04.2004, 06:13

I'm seeing the name displayed correctly, but the orbit isn't displayed correctly. Hyperbolic orbits are aperiodic, and Celestia needs to do a better job of choosing which segment of the orbit to render.

--Chris

don
Posts: 1709
Joined: 12.07.2003
With us: 16 years 11 months
Location: Colorado, USA (7000 ft)

Post #4by don » 01.04.2004, 10:14

Chris,

Would you like this one added to the Tracker?
-Don G.
My Celestia Scripting Resources page

Avatar: Total Lunar Eclipse from our back yard, Oct 2004. Panasonic FZ1 digital camera (no telescope), 36X digital zoom, 8 second exposure at f6.5.

bassrat
Posts: 16
Joined: 08.02.2004
With us: 16 years 5 months
Location: Iowa

Post #5by bassrat » 11.04.2004, 16:38

I too am experiencing the same problem in Celestia 1.3.1 not displaying the orbit for this comet whereas it does for the other comets on my system. I questioned if whether the problem was because the orbit is non-eriodic and hyperbolic instead of elliptical.

I posted a question about this in another forum http://shatters.net/forum/viewtopic.php?t=4836

Can this be listed as a bug to be fixed?


[/list]

don
Posts: 1709
Joined: 12.07.2003
With us: 16 years 11 months
Location: Colorado, USA (7000 ft)

Post #6by don » 11.04.2004, 18:45

Just added this one to the Bug tracker.
-Don G.

My Celestia Scripting Resources page



Avatar: Total Lunar Eclipse from our back yard, Oct 2004. Panasonic FZ1 digital camera (no telescope), 36X digital zoom, 8 second exposure at f6.5.


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