M97 PN, M108 Galaxy and Many Friends in a NB / BB Combo (David Payne)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: HD96717 · HD97302 · HD97455 · M 108 · M 97 · NGC 3556 · NGC 3587 · Owl Nebula · PGC 2475026 · PGC 2476549 · PGC 2477242 · PGC 2477924 · PGC 2478521 · PGC 2478573 · PGC 2479134 · PGC 2479429 · PGC 2479466 · PGC 2481299 · PGC 2481387 · PGC 2482169 · PGC 2482280 · PGC 2483306 · PGC 2484482 · PGC 2486236 · PGC 2486887 · PGC 2487391 · PGC 2488942 · PGC 2489233 · PGC 2489976 · PGC 2490291 · And 58 more.

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M97 PN, M108 Galaxy and Many Friends in a NB / BB Combo

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M97 PN, M108 Galaxy and Many Friends in a NB / BB Combo

M97 (Owl Planetary Nebula) & (M108 Surfboard Galaxy) (Ursa Major) , Narrowband/Broadband Filter Combo, April 2023
Televue 127is telescope and A-P Mach2 mount
ASI6200MM Camera, Antlia Pro BB & 3nm Ha Filters
RGB (3 x 20 x 120s exposures, Bin 1x1 Gain 100)
HOS (3 x 19 x 600s exposures, Bin 1x1, Gain100)
Total Integration Time = 11.5 hours
Two Messiers in one image. The galaxy begged RGB with possible Ha filters, but planetary nebulae show up best with narrow-band images. My solution was to shoot both narrowband and broadband, and combine by taking the maximum contribution to each broadband channel by each narrowband / broadband filter. The biggest hurdles were managing colour saturation during image stretches, and managing noise.
M97, the Owl Nebula, is a beautiful planetary nebula, with its bluish white-dwarf visible in the centre. It is the result of a sun-like star going novae about 8000 years ago. The ejected gases from the supernovae emit visible light by being bombarded by UV radiation from the planet sized white dwarf star.
M108, the Surfboard Galaxy, is a barred spiral with "loosely wound" spiral arms. It contain "supershells" of gas ejected from the spiral plane by past supernovae, and also contains multiple strong X-ray sources.
While M97 is a fairly close neighbour at 2,000 light-years distant, M108 is 40 Million lightyears away.

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Status	Advanced success
Started	...
Astrometry.net job	7693437
PixInsight job	J4HG72VD313W8GDKKEP94JZWSL6JLVG6
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	11h12m39s.76
RA (top/left)	11h07m07s.80
RA (top/right)	11h13m48s.64
RA (bottom/right)	11h18m09s.38
RA (bottom/left)	11h11m27s.88

Dec (center)	+55°18′26″.9
Dec (top/left)	+55°26′25″.3
Dec (top/right)	+54°31′41″.6
Dec (bottom/right)	+55°09′32″.1
Dec (bottom/left)	+56°05′12″.4

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M97 PN, M108 Galaxy and Many Friends in a NB / BB Combo

M97 PN, M108 Galaxy and Many Friends in a NB / BB Combo

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M97 PN, M108 Galaxy and Many Friends in a NB / BB Combo

M97 PN, M108 Galaxy and Many Friends in a NB / BB Combo

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