M31, the Andromeda Galaxy

1100mm/F7.3 telescope

Pentax 645z (astro-modified)

three-frame mosaic

total exposure time = 53.7 hr (45.7 hr of RGB + 7.9 hr of Hα)

original image is 31320 x 17220 (539 mega pixels)

 

see www.gigapan.com/embeds/xp5Hj6H2dlw/ for a pan/zoomable high-resolution version.

 

see astrob.in/369032/0/ for more technical details.

Done