Some useful links for double star observation
Some useful links for double star observation
★ Florent Losse’s site. Florent’s contribution in the field of double star observation and measurement by amateurs is invaluable, in particular by having developed the REDUC software. His site also proposes a very good introduction to the principles and techniques of measurements by means of CCD imaging for those who would like to delve into this domain.
★ The Washington Double Star Catalog, at USNO
★ The Sixth Catalog of Visual Binary Stars, also at USNO
★ The Pickering scale, for estimating the seeing