This site is using the Washington Double Star Catalog maintained at the U.S. Naval Observatory.
A special thank to Dr. Brian Mason for this work and to kindly replying to all my error reporting emails.

Credits to Toshimi Taki for his useful orbit calculation Excel file.
Thank you Toshimi for sharing your knowledge. Thank you also for your wonderful double star atlas.

Credits to Bruce MacEvoy for his Star Plotter Excel file.
The graph formula was used as a base to create my own version of the virtual eyepiece.

Thank you to Alessandro Bertoglio (abtf) for your useful advices and to share with me your observing database built up in Access: a valuable source of inspiration for writing the report section of this site.

Credits due to Nancy G. Roman for her useful program.f, "Identification of a constellation from a position" (1987), and Francois Ochsenbein [CDS] for his C language translation (2001).

This site makes use of JPGraph PHP libraries from Johan Persson, Aditus Consulting.

Development platforms and production systems running on FreeBSD operating system.

Stelle Doppie (Double Star Database) is © Gianluca Sordiglioni. All rights reserved.
If you use this site in your work, it is appreciated to add an acknowledgment to