Seasonal flux density variations of 1253-055 at 2 and 8 GHz, calculated by de-trending the light curves on bins of ten months. The de-trended data are plotted versus day of the year (DoY); black and blue squares show the best-fitting Gaussian models. At 2 GHz, the effect of the Sun starts around DoY 265 and ends around DoY 298, indicating an influence spreading to solar elongations up to ∼16°. For the 8 GHz data the influence is limited to ∼8°.