Dne 26/11/2017 v 06:00 stargene napsal(a):

[...]

In scanning the wikipedia entry on "Escape Velocity", at
https://en.wikipedia.org/wiki/Escape_velocity , I noticed in its list
of escape velocities that for the Jovian planets alone (but not for smaller
planets) the tabulated escape velocities for each Jovian was almost exactly
identical to the escape velocity for the sun itself AT that planet's orbit.

IE:
(1) Jupiter's esc. vel. = 60.2 km/s Sol's esc. vel. =
at J's orbit = 60.4 km/s
[...]

You confuse Sun escape speed at Jupiter orbit
with Sun-Jupiter system escape speed 60,4 km/s

V = sqrt ( ((v_S . k )^2 + (v_J)^2 )

where
k = 1-1/sqrt(2) = cca 0.2929 for circular orbits
v_S is Sun escape speed at Jupiter orbit
v_J is Jupiter escape speed
v_Sys is Sun-Jupiter system escape speed
to escape both Jupiter and Sun gravity.

Read the section Multiple bodies.

https://en.wikipedia.org/wiki/Escape...ultiple_bodies


--
Poutnik ( The Pilgrim, Der Wanderer )

A wise man guards words he says,
as they say about him more,
than he says about the subject.