Príspevky

Zobrazujú sa príspevky z dátumu november, 2019

Nodal precession Precesia uzlov

Obraz
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 ω p  is the precession rate (in  rad /s) R E  is the body's equatorial radius ( 6 378 137  m  for Earth) a  is the  semi-major axis  of the satellite's orbit e  is the eccentricity...

Starlink SpaceX

Obraz
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) Fáza Výška (km) Počet rovín Satelitov v rovine Počet satelitov Inklinácia (stupňov) Termín dokončenia  na 1/2 Termín dokončenia  Súčasne funkčných (8. jan 2020) 1 550 72 22 1 584 53 marec 2024 marec 2027 180 1 110 32 50 1 600 53,8 0 1 130 8 50 400 74 0 1 275 5 75 375 81 0 1 325 6 75 450 70 0 2 335,9 2 493 42 november 2024 november 2027 0 340,8 2 478 48 0 345,6 2 547 53 0 spolu 11 927 Starlink 34 days fly, altitude 350 to 550 km. First 20 satellites climb from 350 to 550 km: Starlink-1022, Starlink-1038, Starlink-1039, Starlink-1041, Starlink-1042, Starlink-1043, Starlink-1045, Starlink-1046, Starlink-1050, Starlink-1053, Starlink-1054, Starlink-1055, Starlink-1056, Starlink-1058, Starli...