I know that JWST won't be orbiting around any specific body in L2, so what causes it to keep in that orbit?
Why not park it right at L2, where it would (presumably) require less thrust to keep it there, and thus prolong its lifespan?
- I understand things like what a Lagrange point is, I just don’t understand how they come into it
I can't seem to find a clear answer to this:
The telescope is set to do a heliocentric orbit at L2 but will also do a halo orbit around L2.
Can someone explain the reasoning for doing this smaller orbit around L2?
I thought the point of putting satellites at the Lagrange points was that the unique gravitational properties of these spots in 3-body systems allowed them to basically sit still with little to no fuel needed to keep them there in a stable manner. Reading about the JWST I saw that the telescope will be in a constantly moving Halo Orbit, which requires fuel to maintain stability. Why would that be necessary?
From what I understand the JWST will stay in a small orbit around the L2 point to avoid the earth’s shadow. But the plane of that orbit is perpendicular to the gravitational pull of the earth and sun, so I’m wondering what force is allowing the telescope to stay in the halo orbit.
A friend told me about the NASA gateway, and tried to explain the NRHO concept, but it went over my head.
I’m making a replica of the sls missions, but I need help with getting it in to a munar halo orbit. I play on console so mods aren’t available but I do have both dlcs
And I don’t remember if someone answered the question of if they have slipspace drives wouldn’t that give them an advantage? Or they can’t leave because they don’t want to abandon Atriox and his crew? And I know he was being snarky but I’m genuinely baffled that Yap Yap has been able to run freely without Pavium, Voridus, Colony, Let Volir, and Atriox hunting him down. Surely a Grunt can’t outsmart and avoid all of them right?
I had a goal, a simple goal: to make sense of Halo Reach’s astronomy. Well, allow me to tell you that I’ve done the exact opposite. Here is everything broken with Halo Reach’s astronomy:
First things first, let's start with something that makes sense. At first I miscalculated Reach's volume, getting a value that was 13 times that of Earth. This, paired with Reach's mass which is 1.55 that of Earth lead me to believe that the gas giant density I found could only be explained by Reach being hollowed out by the Forerunners. As u/DeathsIntent96 pointed out I made a colossal mistake. In reality Reach would have a mass 1.72 times that of Earth and a far more reasonable density of 4.96 g/cm^3. This blows the "Hollow Reach Theory" part of this post out of the water. Based on the mass and density of the planet, Reach seems to be a slightly less dense Earth-like planet with a strong dynamo effect at the core (hence the very active tectonic activity bringing titanium to the surface, and the aurora around the planet that some have theorized is due to a strong magnetic field). Always check your math kids.
Second things second, the HUD compass makes measuring approximate angular sizes of things in the skybox a lot easier. In Combat Evolved I was making approximations of the size of Threshold and Basis based on how much of the sky they take up between the horizon and the ring in the sky (the zenith). The HUD compass gives me a nice 360 degree measuring system to use for horizontal measurements, which makes measuring the angular size of Reach's moons (Csodaszarvas and Turul) a whole lot easier. I can then take those measurements, compare to the canonical dates, and try to find (1) the eccentricity of their orbits and (2) maybe some estimates of the masses/sizes of the moons.
Ok, so that didn’t go as planned. Throughout the campaign we only get 4 looks at Csodaszarvas and 3 at Turul. The angular size of Csodaszarvas ranges from about 19.8 to 27 degrees while Turul ranges from 4.5 to 8 degrees. From those numbers some things should become very apparent: these moons take up a lot of the sky, and they range in size a lot. For reference, if the moon were as close to Earth as Phobos is to Mars (9,380km) then it would take up 20 degrees of the sky, only putting it in the lower bound of Csodaszarvas. In reality the moon only takes up half of a degree in the sky and varies by 14% in diameter (as opposed to Csodaszarvas’s 35% and Turul’s insane 77.8%). The real kicker is that e
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