Globular cluster in Pegasus is very far from Earth, specifically 33 600 light years and its diameter is approximately 175 light years. It contains more than 100 000 stars.

Most of the globular clusters are quite bright (M15 has magnitude 6.2), therefore there is no long exposure required. On the other hand longer exposures might overexpose the core, therefore I selected exposure time to 2 minutes.


Telescope:Newton 254/1000 mm
Aperture:254 mm
Focal length:730 mm
MountGemini GF53f
AutoguidingZWO 174MM, TS 60/240 mm
Camera:Moravian instruments G2 8300M @-30C
Corrector:ASA 2" reducer 0.73
Filters:Baader LRGB
Exposure:26xL 16xRGB, 120 s, bin 1x1