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M15 – Globular Cluster in Pegasus – Light Switch 8, 600Da

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#1 jgraham

jgraham

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Posted 05 December 2021 - 08:42 PM

Telescope: Light Switch 8 @ f/6.2 (Optec 0.62x focal reducer), altaz mode
Camera: Full Spectrum Modified Canon 600D, interval timer
Filter: GSO IR Blocking Filter
Guide scope: None
Exposure: 40x10sec, ISO 1600, saved as RAW
Darks: Internal (Long Exposure Noise Reduction On)
Flats: 32x1/10sec, Tee shirt flats taken at dusk
Average Light Pollution: Red zone, Bortle 8, fair transparency
Lensed Sky Quality Meter: 18.6
Stacking: Mean with a 1-sigma clip.
White Balance: Nebulosity Automatic
Software: Deep Sky Stacker, Nebulosity, Photoshop

 

M15 (9-29-2021)-1j.jpg

M15, a bright, condensed globular cluster in a relatively lonely stretch of sky in Pegasus. It is one of the oldest known globular clusters with an estimated age of 13.2 billion years and the first globular cluster found to have a planetary nebula (Pease 1), one of only four planetary nebula associated with a globular cluster. M15 is also one of the most condensed globular cluster and at some point in the distant past it experienced a core collapse that may have heralded the formation of a black hole in its nucleus. This is supported by the fact the M15 is an x-ray source.


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