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Boeing CST-100 Starliner

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On 22 December 2019 at 6:55 AM EST, Starliner was cleared to reenter the Earth's atmosphere. A 55 second deorbit burn started at 7:23 AM EST. Service module separation occurred at 7:26 AM EST and entered Earth's atmosphere at 7:41 AM EST.The heat shield jettisoned and the drogue-chutes deployed at 7:53 AM EST main parachutes deployed at 7:54 AM EST.[citation needed] The Starliner touched-down at White Sands Missile Range successfully at 7:58:02 AM EST.

Halo orbit

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A halo orbit is a periodic, three-dimensional orbit near the L1, L2 or L3 Lagrange point in the three-body problem of orbital mechanics. Although the Lagrange point is just a point in empty space, its peculiar characteristic is that it can be orbited. Halo orbits can be thought of as resulting from an interaction between the gravitational pull of the two planetary bodies and the Coriolis and centrifugal accelerations on a spacecraft. Halo orbits exist in any three-body system, e.g., the SunEarth–Orbiting Satellite system or the Earth–Moon–Orbiting Satellite system. Continuous "families" of both Northern and Southern halo orbits exist at each Lagrange point. Because halo orbits tend to be unstable, stationkeeping is required to keep a satellite on the orbit.

Most satellites in halo orbit serve scientific purposes, for example as space telescopes.
https://en.wikipedia.org/wiki/Halo_orbit






Nodal precession Precesia uzlov

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Nodal precession is the precession of the orbital plane of a satellite around the rotational axis of an astronomical body such as Earth.Rate of precession The rate of precession depends on the inclination of the orbital plane to the equatorial plane, as well as the orbital eccentricity. For a satellite in a prograde orbit around Earth, the precession is westward (nodal regression), the node and satellite move in opposite directions.[1] A good approximation of the precession rate is {\displaystyle \omega _{\mathrm {p} }=-{\frac {3}{2}}\cdot {\frac {{R_{\mathrm {E} }}^{2}}{\left(a\left(1-e^{2}\right)\right)^{2}}}J_{2}\omega \cos i} where ωp is the precession rate (in rad/s)RE is the body's equatorial radius (6378137 m for Earth)a is the semi-major axis of the satellite's orbite is the

Starlink SpaceX

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Starlink (satellite constellation) Starlink is a satellite constellation being constructed by American company SpaceX,[1][2] to provide satellite Internet access.[3][4]
https://en.wikipedia.org/wiki/Starlink_(satellite_constellation)



FázaVýška (km)Počet
rovín Satelitov
v rovine Počet satelitovInklinácia
(stupňov) Termín dokončenia  na 1/2Termín dokončenia Súčasne funkčných
(8. jan 2020) 155072221 58453marec 2024marec 20271801 11032501 60053,801 1308504007401 2755753758101 325675450700 2335,92 49342november 2024november 20270340,82 478480345,62 547530spolu11 927
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