Celestia Forums

I did this movie with spectacular results, is it a new thing?

I calibrated the Celestia movie to the Cassini image sequence by aligning the fixed stars in motion.

http://www.youtube.com/watch?v=_tiyQ79Z ... w#t=01m38s

English closed captions included.

Not sure what the UFO thing is about (can't read italian), but the moons seem to be identified correctly. Some of the position differences are due to your version of Celestia using Keplerian elements for Saturn's small moons, which isn't quite correct due to the effects of nearby, larger moons.

The screen shot below uses SPICE kernels for the moons of Saturn, so the positions should be much closer.

The video identified Calypso and said it was not correct in Celestia, yet Calypso is a trojan of another larger moon so I think it is more likely that the video misidentified Calypso, and Celestia has it right.

Haven't really looked into it much, so don't hold me to that.

No that is Calypso. Celestia has it wrong as Calypso definitely doesn't have a simple Keplerian orbit. At some point I need to create a youtube video showing that.

http://en.wikipedia.org/wiki/Horseshoe_ ... pole_orbit

Everything I find says Calypso is 60° behind Tethys in its orbit.

The horse-shoe orbits don't involve trojan configurations, and as far as the Saturn system goes is only seem at Janus and Epimetheus.

No, Calypso (and the other trojan moons) has a tadpole orbit, which is the similar to a horseshoe orbit, except Calypso just librates around the L5 point, rather than bouncing between L4 and L5 like Epimetheus. That means that sometimes Calypso is further away or closer to Tethys or Saturn.

Ahh, okay. That makes sense.
Thanks.

I identified that moon as Calypso because of it's proximity to the Celestia simulation of Calypso.

I was in an hurry because of a "war" with the ufologists that tried to steal my research.

I think that the best way to determine which moon it really is, should be by analyzing the magnitude.

It is much honest to say that it probably is one of the three moons on Tethys orbit, but I'm not been able to identify exactly which one.

But the video reached it's goal, the ufologists removed the original "UFO" video and the second video they made to try to pass the discovery as them.

They also closed their site to unregistered users, hiding themselves from the internet.
http://www.lunexit.it/gallery

They are "moderate" ufologist, they comment any astronomy news with all their ignorance (a kind of Bad Astronomy parody), for me they are even worse than the "extremist" ufologist because they look like scientists to uneducated people.

They have a few english videos on their Youtube channel, if you want to laugh go to http://www.youtube.com/user/LunarExplorerItalia

I humbly thank you for posting that video and helping to dispel the UFOlogy nonsense.