How to calculate the flight path angle, γ, from a state vector?
In addition to $\gamma$, the angle between the tangential direction and the velocity vector, there is $\beta$, the angle between the radial direction and the velocity vector. People often say "flight path angle" without saying which definition they're using. Confusing! (I just noticed that the diagram in Julio's answer also shows $\beta$)
Calculate flight path angle given semi-major axis, eccentricity and ...
2020年5月4日 · The flight path angle is simply the angle between the velocity vector and the vector perpendicular to the position vector. An easy way to visualise this: If the orbit was a circle, this angle would be zero. The angle is therefore due to the contribution of the inward/outward motion of the object away from the focal point.
What does a flight path angle of zero degrees mean at launch?
2022年10月29日 · the confusion arises because this is the inertial flight path angle (in Apollo documents "space-fixed" == "inertial") So sitting on the pad the vehicle in the "space-fixed" coordinates has a horizontal velocity of ~ half a km/s (due to the rotation of the Earth) and a flight path angle of 0.
reentry - At what angle did Apollo 13 need to reenter? - Space ...
There was really no difficulty in targeting the desired entry flight path angle, assuming that your thrusters were working. All of the Apollo lunar returns were within about a tenth of a degree of -6.5° (halfway between -5.3° and -7.7°), except for Apollo 13, which was within a quarter of a degree. $\endgroup$ –
Re-entry Dynamics - Space Exploration Stack Exchange
2015年11月20日 · The flight path angle is always changing, whether you've hit the atmosphere or not, but there is only one entry flight-path angle per entry. For Apollo the entry interface was defined at 400,000 ft (about 122 km).
What information can I get if an elliptical orbit intersecting a ...
2019年11月9日 · If a line cuts two parallel lines, opposite agles are congruent. So we know the velocity vecotr from the circular orbit also cross the parallelogram edge opposite the position vector at a right angle. The three angles of a triangle sum to 180º. So we know that flight path angle λ is the same as angle cpf1.
How can you determine the nature of an object from its flight path ...
2020年1月20日 · Assuming that a defense system is capable of determining an object's flight path angle ($\gamma$), velocity (v), and radius (r), how could one differentiate between an ICBM, a satellite, or a solar probe? One could begin with the energy equation: $$\epsilon = \frac {v^2}{2} …
Is it possible to estimate the angle of attack or flight path angle of ...
2022年7月5日 · $\begingroup$ The angle of attack is the angle between the axis and air flow, for rockets this should always be almost zero. $\endgroup$ – GdD Commented Jul 5, 2022 at 9:01
orbital mechanics - Why is the bend angle of a hyperbolic …
2020年3月30日 · Question: The image above shows that this hyperbolic trajectory clearly has a very big bend angle, about $180^o$ (less actually but to the eye it looks 180 deg). But formula 1 gave a result of $\delta = 0.573$. This can't be degrees. But it's also not radians because $0.573 rad = 32^o$. It can't be arc mins or arc sec.
orbital mechanics - Space Exploration Stack Exchange
In the Mark Adler's simulations, there appear to be two cases, one with high constant acceleration value to highlight the spiral behaviour where the final flight path angle seems to be 31º and one with a low value of the acceleration where the final path angle seems to be near 0º (at look), so it has clearly a dependance of the applied ...