Użytkownik "robot" napisał w wiadomości grup
dyskusyjnych:61c06395$0$23913$6578...@news.neostrada.pl...
>Czy ktoś mógłby mi wyjaśnić dlaczego webb będzie krążył dookła L2,
>oraz promień jego orbity wokół L2 jest taki a nie inny?
>I jaki jest ten promień orbity wokół L2?
>Obejrzałem sporo materiałow na youtubie i nigdzie o tym nie mówią.
Na ile rozumiem - L2 jest niby stabilny, ale to nie jest równowaga
stabilna.
Cialo umieszczone w poblizu bedzie sie poruszac dookola tego punktu.
https://en.wikipedia.org/wiki/Halo_orbit
A halo orbit is a periodic, three-dimensional orbit near one of the
L1, L2 or L3 Lagrange points in the three-body problem of orbital
mechanics.
Although a Lagrange point is just a point in empty space, its peculiar
characteristic is that it can be orbited by a Lissajous orbit or a
halo orbit.
These can be thought of as resulting from an interaction between the
gravitational pull of the two planetary bodies and the Coriolis and
centrifugal force on a spacecraft.
In 1973 Farquhar and Ahmed Kamel found that when the in-plane
amplitude of a Lissajous orbit was large enough there would be a
corresponding out-of-plane amplitude that would have the same period,
so the orbit ceased to be a Lissajous orbit and became approximately
an ellipse. They used analytical expressions to represent these halo
orbits; in 1984, Kathleen Howell showed that more precise trajectories
could be computed numerically. Additionally, she found that for most
values of the ratio between the masses of the two bodies (such as the
earth and the moon) there was a range of stable orbits.[3]
A JWST ... jesli dobrze rozumiem, to ma te "orbite" dosc duzą (setki
tys km), o okresie pol roku, a plaszczyzna krazenia prostopadla do
plaszczyzny orbity Ziemi.
film prosto z NASA
https://www.youtube.com/watch?v=6cUe4oMk69E
Ale nie - plaszczyzna krazenia nie moze byc prostopadla, musi byc
jakos nachylona.
J.