NGC 752 – Open Cluster in Andromeda

Telescope: Meade N6 at f/5, Orion Atlas EQ-G
Camera: Full-spectrum Modified Canon 600D, Orion Imaging Skyglow Filter
Guide scope: Williams Optics 50mm, Meade DSI Pro III, PHD
Exposure: 32x60sec ISO 800 saved as RAW
Darks: Internal (Long Exposure Noise Reduction On)
Flats: 32x1/250sec, ISO 800, tee shirt flats taken during twilight
Average Light Pollution: Red zone, poor transparency
Lensed Sky Quality Meter: 18.4 mag/arc-sec^2
Stacking: Mean with a 2-sigma clip.
White Balance: Nebulosity Automatic
Software: Backyard EOS, Nebulosity, Deep Sky Stacker, Photoshop

NGC 752 is a fairly large, sparse open cluster lying halfway between Triangulum and Andromeda. It is about 1 degree in diameter and is a fine object for small telescopes. On its southwestern edge is a nearly even pair of golden orange stars collectively designated as the double star 56 Andromeda. At magnitudes 5.7 and 5.9 they are actually not close to each other at all, the brighter of the pair being about 360 light years away while the fainter is 1200 light years distant. Both are red giants. Together they make a fine signpost that you’re in the right area.


NGC 752 (11-26-2017)-1j.jpg