M22 is a large, bright globular cluster located in the constellation of Sagittarius.
It is located about 10,400 light years away, making it one of the nearest globular clusters.
M22 is brighter and larger than the northern hemisphere showcase globular M13, and is the third brightest globular cluster in the sky behind only Omega Centauri and 47 Tucanae, both of which are southern hemisphere objects.
Exposure Data
- Lens: 130mm aperture f/8 triplet apochromatic refractor (no field flattener)
- Focal Length: 1040 mm
- F/stop: f/8
- Exposure: 4 x 600 seconds (40 minutes total)
- ISO: 400
- File Format: RAW
- Camera: Modified Canon EOS 550Da (T2i) DSLR
- Mode: Manual
- White Balance: Custom Daylight
- In-Camera Noise Reduction: Off
- Filter: Astronomik CLS
- Mount: Takahashi EM200 Temma 2M
- Date: September 10, 2012
- Start Time: 9:45 p.m. EDT
- Location: Cherry Springs, PA
- Calibration: Darks in Images Plus
- Processing: Adjust and enhance in Photoshop CS5, Lucy Richardson deconvolution in Astra Image
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