Astronomical Photometry CD Annals of the Deep Sky long out of print

long out of print

as well as the colliding galaxy NGC 2623 (Arp 243)

There are several programs

and as the dawn light grows

Vindemiatrix

Astronomical Photometry CD Annals of the Deep Sky long out of printAuthors: Arne A. Henden & Ronald H. Kaitchuck For the Adanced Amateur & Professional Astronomer (Software for the IBM PC) In addition to writing a book on the subject Astronomical Photometry, the authors have written a professional level computer program based upon the techniques described in their book. The software package is a fairly complete photoelectric photometry data reduction system. There are several programs, each of which handle a