M2 – Globular Cluster in Aquarius

Telescope: Meade SN8 at f/4, Orion Atlas EQ-G
Camera: ZWO ASI071MC, Orion Imaging Skyglow Filter
Sensor Temperature: 0C, Gain: 200, Offset: 50
Guide scope: Williams Optics 50mm, Meade DSI Pro II, PHD
Exposure: 79x90sec saved as FITS
Darks: 32x90sec saved as FITS
Flats: 32x0.005sec, tee shirt flats taken during twilight
Average Light Pollution: Red zone, fair transparency
Lensed Sky Quality Meter: 18.4 mag/arc-sec^2
Stacking: Mean with a 2-sigma clip.
White Balance: Nebulosity Automatic
Software: Nebulosity, Deep Sky Stacker, Photoshop

M2 is a big, beautiful globular cluster that is well placed in the eastern sky in late summer and early fall. It is an easy target for a small telescope. Under dark skies it can even be glimpsed without a telescope or even binoculars. M2 is about 37,500 light years away and lies beyond the galactic center. Like most globular clusters M2 is truly ancient with an estimated age of about 13 billion years.

-John

M2 (8-25-2017)-2j.jpg