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