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General >> Discussion >> Pluto and Orcus
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Message started by Tony on 08/30/15 at 13:52:26

Title: Pluto and Orcus
Post by Tony on 08/30/15 at 13:52:26

Alan Stern, the principal investigator of the New Horizons space probe, goes by the name NewHorizons2015 on Twitter.
He just re-tweeted one of Frank's animations:

https://twitter.com/NewHorizons2015

Title: Re: Pluto and Orcus
Post by Tony on 08/30/15 at 18:04:09

This inspired me to make one with the browser version.
http://orbitsimulator.com/BA/orcus.gif
Pluto and Orcus in a rotating frame holding Neptune stationary.
This simulation illustrates one of the reasons Orcus is sometimes referred to as the anti-Pluto.

Title: Re: Pluto and Orcus
Post by frankuitaalst on 09/07/15 at 12:05:23

Nice animation Tony .
Have you tried to set the rotating frame to Pluto ?
I did so , covering 40000 years from now .
In my sim Orcus seems to be on an oscullating  tadpole orbit , but not quite going as far as the opposite side from Pluto .  
Wonder if you get the same result .  In this case Orcus is rather a "coorbital " to Pluto.

Title: Pluto and Orcus
Post by frankuitaalst on 09/08/15 at 01:10:40

I've checked my simulation of Orcus again and have the impression Orcus is on a semi tadpole orbit in rotating frame to pluto .
Screenshot covers the first 500 years from now ( Pluto is represented as a yellow line ) .
The orbit of Orcus will come closer to Pluto's , then intersect and moving away again to the left , but never getting to the opposite site of Pluto's.
It seems Orcus is a coorbital of Pluto in a librating orbit .

Title: Re: Pluto and Orcus
Post by frankuitaalst on 09/08/15 at 12:18:17

In order to place "Orcus " in a broader perspective I introduced a new topic "Plutinos"

Title: Re: Pluto and Orcus
Post by Tony on 09/09/15 at 22:41:48

If you set Pluto's mass to 0 in the simulation, Orcus would still have tadpole behavior to Pluto.  The orbits of Pluto and Orcus are only related because they're both related to Neptune.

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