Re: Can anyone draw a simulation of two orbiting planets?

On Sep 1, 12:42 pm, "gu...@xxxxxxxxxxx" <gu...@xxxxxxxxxxx> wrote:
On Sep 1, 10:48 am, "Paul B. Andersen"



<paul.b.ander...@xxxxxxxxxxxxxxx> wrote:
gu...@xxxxxxxxxxx wrote:
On Aug 31, 11:08 am, "T.M. Sommers" <t...@xxxxxx> wrote:
Randy Poe wrote:
On Aug 31, 4:53 am, "gu...@xxxxxxxxxxx" <gu...@xxxxxxxxxxx> wrote:
Can anyone draw (perhaps animated gif) a simulation of two orbiting
planets of SAME MASS?
I cannot image how two same mass orbits would look like? ....would
they propagate forward or remain in one constant region?
One location, which doesn't seem to make sense, says: "Since stars
have about the same mass (within a factor of 20), they both orbit
around a common point, called the center of mass, that is
significantly different from one of the star's center.".
(http://www.astronomynotes.com/starprop/s10.htm)
Two bodies, whether the same mass or not, rotate around
the common center of mass.
If one is much heaver than the other, that center of mass
is approximately the center of the heavier body.
And if they are of equal mass, the CM will be the midpoint of the
line joining them. From that it should be trivial to imagine the
two bodies in circular orbits. Elliptical orbits are trickier,
but a few moments thought should provide an answer. Hint: the
bodies do not necessarily rotate in the same direction.

Don't know why opposite spins would affect the orbit.

As for ellipses I would imagine the midpoint between "one" specific
focal point of each ellipse.

Play with this:http://instruct1.cit.cornell.edu/courses/astro101/java/binary/binary.htm

Paul- Hide quoted text -

- Show quoted text -

Very nice Paul!

One thing doesn't make sense:

At Wikipedia it says the orbital period is: T= 2pi sqrt(r^3/ G (M+m)).

Since "r" (or ellipse's semi-major axis) is different for each star
therefore the orbital period should be different for each star....but
at the java web link you gave each star "ALWAYS" orbits at the "same"
rate as the other???

When you change the meaning of an equation's symbols,
you are not using the original equation, you are inventing
your own physics.

That is not the meaning of "r" in this equation.

See here for instance:
http://hyperphysics.phy-astr.gsu.edu/hbase/orbv.html#bo

Look at the drawing. See the definition of r.

It is the distance between the two planets in
circular orbit. It is the sum of their individual
orbital radii r1 and r2.

- Randy

.

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