The 8th annual GEOS symposium was held in Marly‑le‑Roi on 15–17 April 1983, gathering observers from Belgium, Spain, France and Italy. Beyond the usual presentation of observational results and programme planning, discussions focused strongly on opening GEOS toward external collaborations, especially through regular publication of stellar occultation results.
Pampaloni reported that CSV 5953 Cas, once promising, shows no coherent variability despite 7000 measurements; it is removed from the research programme. He also resumed work on EU Del using several thousand GEOS observations. P. Guiraudou presented preliminary results on CSV 8151 Aql, proposed for the next summer camp. M. Benucci and R. Boninsegna confirmed variability in CV Dra, likely a short‑period star. NZY summarised work on DV Aqr and CSV 7085, both showing clear periodic behaviour.
Boninsegna presented a refined ephemeris for LO And based on more than 4300 GEOS measurements. M. Dumont reported photoelectric observations of CY Aqr and V 566 Oph from the Jungfraujoch, including colour‑index variations. P. Baruffetti noted contradictory results on 8 UMa and θ Boo. J.C. Mission updated the long‑term study of XY Lyr. J. Fabregat reported on DH Peg, while G. Boistel presented a long‑period variation in ρ Per.
Busquets summarised results on three faint Cepheids observed at Casinos- 81 and Bédarieux-82 summer camps. A. Gaspani presented a frequency‑domain analysis of V 1016 Ori, comparing several orbital models. C. Romoli described photoelectric missions on BL Cam at Loiano.
A major section was devoted to CSV/NSV stars: A. Figer demonstrated that two long‑studied suspect variables (CSV 5953 Cas and CSV 102241 Cas) are in fact constant, prompting a broader reflection on the low scientific return of CSV prospection. A debate followed, ultimately rejecting a proposed large‑scale NSV campaign.
General presentations included J. Fabregat on BY Dra stars and M. Petit on U Gem variables. Programme decisions for 1983–84 was confirmed, including the multi‑site summer camp.
The symposium also reviewed the rapid development of photoelectric photometry within GEOS, concluding that photometers cannot replace visual observing but are invaluable for rapid confirmation. R. Boninsegna presented extensive results from asteroid occultation campaigns.
A final discussion led by P. Baruffetti addressed GEOS visibility and outreach, encouraging more direct contact with amateur groups and greater dissemination of GEOS results.
