September 2000, Amsterdam - Projects - France

Nicolas Conil (16)
School: Lycee Jean Moulin
Hobbies: Riding bike, gliding, programming with a computer, astronomy
Career intention: Computer Engineer

Stephanie Gaumon (16)
School: Lycee Jean Moulin
Hobbies: Astronomy, horse riding, water-ski, ski and tennis
Career intention: Astronomer

Virginie Laplane (18)
School: Lycee Jean Moulin
Hobbies: Astronomy, skiing and sociologie
Career intention: Anthropologist

The motion of planets
Our astronomy project aims at establishing the orbits of Mars, Venus and the Earth by using photographs and software like Regressi or any other, made by the same group. We have therefore taken regular shots of Mars during its retrogradation in 1999 and shots of Venus in the same year. We have also obtained an additional set of photographs of Mars, through the Internet, concerning the 1990 and 1997 retrogradations. Having processed the data we found that Venus described a circle whose radius is 0.7AU and that its revolution lasted 222 days. The orbit of Mars on the other hand is an ellipse like that of the Earth (the eccentricity in this case being somewhat lesser). However, despite the obvious limitations of these models and because of an interest in the chaos theory, we shall continue our study of these planets in the coming months.

Florent Durrey (18)
School: Lycee Louis Le Grand
Hobbies: Astronomy, computers and sports
Career intention: Engineer in Aerospace Industry

Globular clusters around the Milky Way
Astronomy has always been a passion of mine and being able to use professional equipment was a considerable motivation for me to do this project, which objectives are to determine the age of star clusters called globular clusters, as well as their distance from Earth. For this purpose, a diagram called the Hertzsprung-Russell's diagram has been established. It features stars' luminosity in function of their colour. Basic knowledge of stellar evolution enables us to measure both these parameters. The study was carried out on five globular clusters, observed in April 1999 at the Observatoire de Haute-Provence. Pictures were taken with a CCD-camera on the 80-centimetre telescope. An analysis of these pictures was made by a program especially developed for this purpose. Results show that these objects are very old and so far away that they don't belong to our galaxy but only to its vicinity. Moreover, the conclusions concord with previous results of similar studies carried out by professionals

Emmanuel Beliard (18)
School: Jules Heag High School
Hobbies: Tennis, rifle shooting, mountain biking, electronics
Career intention: Special engineer in electronics

Jaquad Elkhalki (18)
School: Jules Heag High School
Hobbies: Basketball, cinema, computing, karate
Career intention: Special engineer in computing

Viscosity in the Jura pipeline
Our project is a study of the Jura pipeline. We were anxious to know why the transport of petroleum should be so expensive (about 7.6 million Euro's!). We choose to focus on a physical aspect of the transport: viscosity. Therefore we built a pipeline scale including a viscosimeter with which we had more experiments. Through these we were able to understand the working of the hydraulic circuit, but the yielding stress is something we have not been able to explain yet.