Globular Cluster in Sagittarius ... Messier 22



Globular Cluster in Sagittarius ... Messier 22
M22 is a relatively close cluster of stars roughly 10,400 Light-Years away and contains about 80,000 stars. It is about 12 billion years old with mostly first generation stars, that is, not containing any metals. To compare, our sun is about 4.3 billion years old and it a product of materials from 1st and 2nd generation stars that have exploded or collided with other stars, both of which produce the heavier elements of its composition. I took this one hour image June 25, 2019 around midnight. This cluster is high in the southernern sky around 1 am in late June.

Techy Stuff:
Telescope: 11" Celestron Edge HD at f/7
Reducer: Celestron 0.7X Focal Reducer
Camera: Altair Hypercam 294c Pro TEC
Sensor Temperature: -5C (23F)
Filter: City Light Pollution Suppression
Capture software: #SharpCap Pro V 3.2
Guiding: PHD 2 (RMS error: 0.28 ... i.e. very good tracking
Mount: CGX
Mount controls: Celestron PWI V2.1.25
Polar Alignment: QHY Pole Master
Light Frames used: 60 at 60 seconds / Gain: 25,000
Binning: 2x2
Dark Frames: 30
Bias Frames: 30
Flat Frames: None
Stacked in Deep Sky Stacker
Post Processed in PixInsight and Photoshop CC
Seeing Conditions: 8 (0-10, where 0 is total cloud cover)
Moon: No Lunar Interference
Bortle Light-Pollution zone: 4.5 (can barely see the Milky Way)
Air Temperature: 79F
Date: June 26, 2019 from 12:00 am - 2:00 am
Location: Backyard, Savannah GA


Return to Pat Prokop's Heavenly Backyard Astronomy Page