TERMIUM Plus®

La banque de données terminologiques et linguistiques du gouvernement du Canada.

R-BAR AXIS [1 fiche]

Fiche 1 2002-05-13

Anglais

Subject field(s)
  • Launching and Space Maneuvering
CONT

The imaginary line connecting the station with the center of the Earth is called the radius vector, or R-bar. Points directly below the station along this line are considered positive while points above are considered negative.

CONT

For visualization purposes, the station's direction of motion is called the velocity vector, or V-bar for short. By convention, points in front of the station are said to be on the positive V-bar while points behind are considered negative. The imaginary line connecting the station with the center of the Earth is called the radius vector, or R-bar. Points directly below the station along this line are considered positive while points above are considered negative. Endeavour, then, will approach the station along the plus R-bar. The station will be oriented with its long axis aligned with the velocity vector, with the Unity module in "front" and Zvezda behind. Unity's nadir and zenith ports will be oriented as their names imply. This orientation, or attitude, is known as "XVV," i.e., the station's X axis is aligned with the velocity vector. The terminal rendezvous sequence will begin with a rocket firing (TI) as Endeavour trails the station by about eight nautical miles. Once the shuttle reaches the plus R-bar, commander Brent Jett will guide the ship up from directly below. As he nears the station, he will yaw the shuttle 180 degrees so its tail is pointing in the direction of motion and its nose toward the minus V-bar. Assuming a good linkup, the shuttle will begin controlling the station's orientation for the duration of Endeavour's mission, moving the lab back into an "X-POP" attitude with the station's X axis perpendicular to the plane of its orbit. In this orientation, the long axis of the station is broadside to the velocity vector.

OBS

R-bar: term officially approved by the International Space Station official approval Group (ISSOAG).

PHR

Docking in R-bar axis.

PHR

R-bar approach.

Français

Domaine(s)
  • Lancement et manœuvres dans l'espace
CONT

Atlantis s'est retrouvée alors sur l'Axe-R, cette ligne imaginaire reliant Mir au centre de la Terre.

OBS

axe-R : terme uniformisé par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).

Espagnol

Conserver la fiche 1

Avis de droit d’auteur pour la banque de données TERMIUM Plus®

© Services publics et Approvisionnement Canada, 2024
TERMIUM Plus®, la banque de données terminologiques et linguistiques du gouvernement du Canada
Un produit du Bureau de la traduction

En vedette

Portail linguistique du Canada

Accédez à une collection de ressources canadiennes sur tous les aspects du français et de l'anglais, y compris des jeux.

Outils d'aide à la rédaction

Les outils d’aide à la rédaction du Portail linguistique ont fait peau neuve! Faciles à consulter, ils vous donnent accès à une foule de renseignements utiles pour mieux écrire en français et en anglais.

Lexiques et vocabulaires

Accédez aux lexiques et vocabulaires du Bureau de la traduction.

Date de modification :