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M69 – Globular Cluster in Sagittarius – ASI294MC Pro

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#1 jgraham

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Posted 29 July 2019 - 07:10 PM

Telescope: Meade N6 at f/5, Baader Mk III MPCC, Orion Atlas EQ-G
Camera: ZWO ASI294MC Pro, 10C; Gain: 200
Filter: Orion Imaging Skyglow Filter
Guide scope: Williams Optics 50mm, Meade DSI Pro II, PHD
Exposure: 20x120sec saved as FITS
Darks: 32x120sec saved as FITS
Flats: 32x10sec, LED tracing tablet covered with 3 layers of muslin
Average Light Pollution: Red zone, poor transparency
Lensed Sky Quality Meter: 17.7 mag/arc-sec^2
Stacking: Mean with a 2-sigma clip.
White Balance: Nebulosity Automatic
Software: Nebulosity, Deep Sky Stacker, Photoshop

 

M69 (7-19-2019)-1j.jpg

 

M69 is one of the smaller and fainter globular in the Messier catalog. This is due in part to the cluster’s distance; about 30,000 light years from Earth and only 6,200 light years from the galactic core. This places the cluster just past the core from our perspective. M69 also lies only about 1,800 light years from its galactic neighbor, the globular cluster M70.

 

M70 is currently low in the southeast as the evening darkens and is well placed for observing on warm summer evenings in the northern hemisphere.


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