Win 1.3.2 p6 - Orbit problems

[don]

Here are several Cel:// URLs displaying the problem, at least for me, on WinXP Pro, SP1 ATI Radeon 9700, current drivers...

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Jittery orbit lines. Seems to be a problem on plantes from Saturn out to Pluto...

cel://SyncOrbit/Sol:Neptune/2004-03-13T06:34:14.30883?x=wOkv0X5GPCACDg&y=+jdMC7LlLqz//////////w&z=TeBktDGrdj1bAQ&ow=0.604302&ox=0.191451&oy=0.723727&oz=-0.272735&select=Sol:Neptune&fov=25.925934&ts=1.000000<d=0&rf=5559&lm=0

cel://SyncOrbit/Sol:Neptune/2004-03-18T19:57:20.36958?x=IKmsC6ztd1UCDg&y=kqYZCTACeKn//////////w&z=tQIWMDNuWA5bAQ&ow=0.048905&ox=0.768674&oy=0.124383&oz=-0.625521&select=Sol:Neptune&fov=25.925934&ts=1.000000<d=0&rf=5559&lm=0

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Weird looking orbit paths (Antialiasing OFF)...

cel://Follow/Sol:Jupiter/2004-03-18T16:18:11.84810?x=AEByVhw3SBlwDA&y=Coxey5M3xFP//////////w&z=VcpkelBoMBne/////////w&ow=0.108031&ox=-0.971467&oy=-0.040709&oz=-0.207182&select=Sol:Jupiter&fov=25.925934&ts=1.000000<d=0&rf=5559&lm=0

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Orbit paths with Antialiasing ON seem to be double or tripple thickness lines...

cel://Follow/Sol:Jupiter/2004-03-18T16:18:44.53684?x=AEC+ZdJpRxlwDA&y=CiwnFg8/xFP//////////w&z=Vco8v4IgMxne/////////w&ow=0.108031&ox=-0.971467&oy=-0.040709&oz=-0.207182&select=Sol:Jupiter&fov=25.925934&ts=1.000000<d=0&rf=6071&lm=0

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Galileo orbit looks like a series of connected arches...

cel://SyncOrbit/Sol:Borrelly/2004-03-13T07:05:12.70970?x=AABiC15+T4FMDQ&y=CkyBpOLNatYj/////////w&z=VcqkHai0kDaI/////////w&ow=0.311118&ox=-0.761864&oy=0.353417&oz=-0.444820&select=Sol:Galileo&fov=26.141817&ts=1.000000<d=0&rf=38327&lm=0

[granthutchison]

Galileo orbit looks like a series of connected arches...

That's what it looks like. Remember Galileo is orbiting Jupiter in a series of ellipses while Jupiter moves around the Sun ... the result is a set of distorted cycloids.

Grant

[don]

Thanks for the Galileo orbit description Grant. I thought I had seen this before but wasn't sure.

[chris]

It could be useful to have the option to display spacecraft trajectories relative to a planet. More generally, it would be nice to be able to specify the frame of reference for any orbit path. It's quite interesting to see the heliocentric orbits of the natural satellites; I remember how surprised I was to see that the Moon's path about the sun was not a cycloid!

--Chris