A SIMPLE KEY FOR ERUCHOMOSC ALGAID UNVEILED

This image of ALKAID was acquired having a 10cm apo refractor by using a focal duration of one thousand mm. with the sky of Milan, Bortle 9 or also worse (!). . Because of the significant light pollution and the need to work with no tutorial scope I had to just take photographs at high gain (three hundred) and 20s of integration Every.The digita