VII. Satellite of Jupiter

Discovery of the Ninth Satellite of Jupiter.

So far as the program has gone, therefore, all the evidence points to a great distance for these objects. As the spirals are undoubtedly in revolution-any other explanation of the spiral form seems impossible-r the failure to find any evidences of rotation would indicate that they must be of enormous actual size, and at enormous distances from us. At a distance of one-thousand light-years, supp...

Satellite Data Compression, Communications, and Processing VII

The structure of planetary surfaces unveils basic formation processes and evolution lines of different objects in the solar system, and often the view on the top of a planet is the only available information about it. Advanced remote sensing technologies on deep space missions are aimed at accessing a maximum of relevant data to characterize a planetary object holistically. This approach requir...

Testing Space Robotics on the Japanese ETS-VII Satellite

Introduction ETS-VII (Engineering Test Satellite VII) is a NASDA programme designed to test key rendezvous, docking and robotics technologies in space. The Japanese space agency has built, launched and operates this test satellite, equipped with a robotic manipulator and a small subsatellite, to carry out such experiments. In response to a NASDA call for co-operation, ESA proposed two experimen...

Space Robot Experiments on NASDAs ETS-VII Satellite

Coordinated control of a satellite mounted robot arm and the satellite attitude Results of the in-orbit experiments on NASDA’s ETS-VII satellite

When a robot arm(s) conducts some tasks on a satellite, the satellite attitude stability is necessary against the robot arm's motion to maintain the communication link and to generate electrical power from the solar panel(s). However the reaction from the robot arm is much stronger than the natural environmental disturbance torque that the traditional satellite attitude control system cares. Na...