About image
M15 is a globular cluster in the constellation of Pegasus; it has an apparent diameter of 18’ and magnitude 6.2.The cluster contains many variable stars, as many as 110, which allowed us to estimate a distance of 33,600 light years.This cluster has two peculiar characteristics: it is one of the densest in the Milky Way and contains a planetary nebula (Pease 1, discovered in 1927 on photos taken by the Mount Wilson Observatory)

Technical data
Optic          GSO RC12 Truss - Aperture 304mm, focal lenght 2432mm, f/8
Mount        10Micron GM2000 HPSII
Camera         Moravian G3-16200 with external filter wheel 7 positions
Filters        Astrodon Gen2 E-Serie Tru-Balance 50mm unmounted LRGB
Guiding system    OAG Moravian M68 with guide camera Moravian G1-0301
Exposure details  L 34x300" bin2 -20C + 15x15" bin2 -30C
             R 11x300" bin2 -20C + 15x15" bin2 -30C
          G 12x300" bin2 -20C + 15x15" bin2 -30C
          B 10x300" bin2 -20C + 15x15" bin2 -30C
Total integration  5.8h
Acquisition      Voyager, PHD2
Processing      Pixinsight 1.8, Photoshop CS5
SQM-L       21.43    
Location       Promiod (Aosta Valley, Italy), own remote observatory
Date          4/28/30 September and 7 December 2019

© Roberto Marinoni 2019 - All rights reserved