An international collaboration among researchers from France, Chile, Germany, Poland, and Italy has compared the cross-correlated radial velocity (RV) curves of five Cepheids, obtained simultaneously in the V band (with HARPS-N) and the H band (with GIANO-B). They found that, for all stars, the V-band RV curve amplitude is approximately 5% larger than that of the H band. This amplitude difference can be explained to first order by the wavelength dependence of the geometric projection factor (i.e., the ratio between the true pulsation velocity and the observed radial velocity), which is directly linked to the expected limb darkening in the V and H bands.

The Telescopio Nazionale Galileo (TNG) is pleased to announce the IV Edition of the National Competition "Giovani Astronomi al Telescopio Nazionale Galileo", organised in collaboration with the Società Astronomica Italiana (SAIt) and the Istituto Nazionale di Astrofisica (INAF).

The celebration marking the 30th anniversary of the inauguration of the Telescopio Nazionale Galileo will take place on Tuesday, 22 September, at the Roque de los Muchachos Observatory.

Thirty years of astronomical research, technological innovation, training and international collaboration. The Telescopio Nazionale Galileo (TNG) is celebrating the 30th anniversary of its inauguration with three days of events taking place from 22 to 24 September 2026 on the island of La Palma.