Following the exercise I made end of august by updating the elements of RR Lyr stars for the schedule of Tarot telescopes, I eventually updated the elements of 347 stars of the GEOS survey.

This is almost the whole sample of 356 stars. I just excluded a couple of stars for which detailed studies are on the way.

The result is in this file.

Most of the stars are RRab stars with the exception of 3 RRc and 2 misclassified cepheids in southern hemisphere. For some stars,new elements are not necessary: for these stars, the reference of the elements are given in the last column of the file. Again, these elements fit the recent observations made during the last decade.

They are intended to be used for predicting maxima in the near future. By the way, I made some statistics : During the last 7 years, after the start of RR Lyr program on the first Tarot telescope, the GEOS RR Lyr Survey collected 6062 CCD maxima on 356 stars.

Apart from the robotic telescopes, Tarot-Calern, Tarot-Chile and Alain Klotz' Faro, the observers who contributed are the following: N. Butterworth, L. Corp, E. Denoux, S. Dvorak, F. Fumagalli, F.-J. Hambsch, F. Hund, D. Husar, J.M. Llapasset, G. Maintz, J. Nicolas, M. Nobile, A. Paschke, P. de Ponthiere, P. Roblin, M. Serrau and F. Van Den Abbeel.

Jean-François Le Borgne

Other Variable Star Associations

The American Association of Variable Star Observers (AAVSO)

The American Association of Variable Star Observers (AAVSO), founded in 1911, is the largest organization of variable star observers worldwide, with members in over 40 countries. Its purpose is to coordinate variable star observations made largely by dedicated amateur astronomers, evaluate the accuracy of these observations, compile, process, and publish them, and make them available to researchers, educators, and those who love variable stars. AAVSO Headquarters now receives over 350,000 observations yearly, from 550 observers worldwide, over half of whom live outside of the USA. They have compiled over 8.5 million observations of variable stars since the founding of the AAVSO in 1911.

Center for Backyard Astrophysics (CBA)

The Center for Backyard Astrophysics (CBA), has been founded in early 80's by Joseph Patterson. Since 1991 they have been engaged in long-term photometric studies of cataclismic variables (CV), mostly with CCD cameras mounted on small backyard telescopes. Amateurs from all around the world contribute to form a highly performing network of observatories, monitoring the activity of CV's over several days without interruption.

Association Française des Observateurs d'Étoiles Variables (AFOEV)

The French Association of Variable Star Observers (Association Française des Observateurs d'Étoiles Variables - AFOEV) was founded in 1921 on the initiative of Jean Mascart, then Director of Lyons Observatory, encouraged by Henri Grouiller, Marie Bloch (Lyons Observatory) and Antoine Brun, then Principal of an Elementary School at Le Breuil (Allier, France), with the collaboration of S.C. Hunter, the vice president of the American Association of Variable Star Observers (AAVSO). As from 1986, July 1, the association headquarters are at Strasbourg Observatory.
At the moment, the association numbers about a hundred observers from fifteen countries around the world.

British Astronomical Association Variable Star Section (BAAVSS)

The British Astronomical Association (BAA) was formed in 1890 and the Variable Star Section (VSS) the following year with the aim of collecting and analysing observations of variable stars. The section is run by a small group of officers who deal with various aspects separately but meet at intervals to discuss and decide future plans and policy. Feedback to members is through the VSS Circulars published four times a year and through the BAA Journal. Papers are published in the BAA Journal, the VSS Circulars and elsewhere. Gary Poyner is the director of the Variable Star Section of the British Astronomical Association.

Hungarian astronomical association

VSNET

BRNO-Variable Star Section of the Czech Astronomical Society

MEDUZA Variable stars group, in Czech Republic

The group of eclipsing binary observers of the Swiss Astronomical Society (BBSAG)