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3

Your number seems quite close to the one below, but that's not a surprise. There isn't a precise beginning to an atmosphere, so it doesn't make sense to look for an exact number. Since the atmosphere varies exponentially, there is no edge to hit, but there is an entry interface, an arbitrary point where the mission planners simply say that the atmosphere ...


3

Reentry vehicles have a turbulent wake, and a transition region exists at some point along the body. The paper Laminar-Turbulent Transition on Reentry Capsules and Planetary Probes has a good overview. Shuttle images from The HYTHIRM Project: Flight Thermography of the Space Shuttle During Hypersonic Re-entry


0

This paper about attitude control in VLEO using aerodynamic surfaces, provides lots of useful data, and glimmers the possibility of such a "cold" atmospheric entry. Maybe taking advantage of the square cube law could become the key, and if a 1U cubesat is too big to keep the angle of descent small enough so that temperature and velocity stay ...


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I would like to answer this correctly this time. So, orbits are about velocity. That means if during that revolution the artificial satellite was at a velocity faster than the rotation of the planet (by that I mean horizontal velocity, not vertical) that is technically an orbit. The atmosphere has nothing to do with the orbit. (you can definitely tell I ...


0

A short answer is temperature profile of atmosphere and change in its chemical composition; both primarily driven by sunlight. You should look at the middle graph below; note that scale is exponential Sun light includes some amount of highly energetic photons (UV and X-ray) that are easily absorbed by atmospheric gases. This process is limited to upper ...


2

I think their preferred term is "Hover slam" not suicide burn. This is somewhat answered in a different question:Boostback, reentry, and landing burn times and it is about 32 seconds. We saw on the NRO mission, where they asked SpaceX not to show fairing deploy or any video from the second stage (Spooks, whatcha gonna do?) that they played the ...


1

Partial answer This refers to the Overlay Tile Repair System (OTRS) provided to repair the ceramic tiles, not the plug system provided to repair the reinforced carbon-carbon portions of the heat shield. The third method is a mechanical repair that uses insulating blankets to fill cavities that are then covered by an overlay of carbon silicon carbonate ...


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