Tag Info

Hot answers tagged

7

This is a fun question, so I spend some time thinking about it. This is what I came up with. Is this possible? Yes, this is certainly possible. Just consider the Solar System itself. We have a massive central body, the Sun, and several tiny subsystems (planets with their moons) orbiting it. Is it stable? Again, from the simple observation that the ...


5

Yes. Charon is in Pluto synchronous orbit. Pluto and Charon are mutually tide locked.


5

Of course, a natural satellite (moon) could have an orbital period equal to the spin period of its host (provided such an orbit would be accessible). However, the tidal friction that may generate such a locking is quite weak, so this would have to be a rare chance. Moreover, perturbations to the orbit from other moons or their host star may put the moon out ...


3

Earth's center of mass must be at one of the two focus points of a satellite's elliptical orbit, or at the center of a circular orbit such as a geostationary orbit. One cannot orbit a certain latitude, except for the equator. But there are clever alternatives for different purposes. Geosynchronous (as opposed to geostationary) orbits mean that the satellite ...


2

Do geostationary satellites need to have the equator as the plane of rotation, and the earth's centre to be the centre of rotation? To be stationary above a point, yes. Can it rotate over, say, the Tropic of Cancer, focusing on a single city? If the satellite's orbit touched the Tropic of Cancer, it would not be geostationary since the orbit ...


1

It would require a very precise trajectory for an asteroid to end up in geostationary orbit. It doesn't happen by chance. Space flight providing companies have to make a real effort to put their customers' communication satellites there. And geostationary isn't a very stable kind of orbit. The varying gravity of the Moon pulls satellites out of their ...


1

You cannot point an antenna with a fixed orientation at a satellite that is not in a geostationary orbit. So to get satellite tv you'd not only need a bunch of satellites in orbit instead of one, but every receiver would need probably at least a couple of dishes on complex and highly accurate alt-az mounts.


1

Ok, it makes a lot of sense that the gravity of the disc of the Milky Way is pulling stars up and down as they go about their circum-galactic orbit. But this wouldn't explain why recent 3-D observations of the nearest stars using the FLAMES-GIRAFFE spectrograph on ESO’s Very Large Telescope and the IMACS spectrograph at the Las Campanas Observatory showed a ...



Only top voted, non community-wiki answers of a minimum length are eligible