Elephant Trunk Nebula: 6-panel mosaic (Paul Macklin)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: B160 · B161 · B162 · B163 · B365 · B367 · B368 · Erakis · Erakis (μ Cep) · HD204613 · HD204827 · HD205196 · HD205510 · HD205917 · HD205948 · HD206081 · HD206183 · HD206267 · HD206482 · HD206773 · HD206842 · HD207086 · HD239676 · HD239706 · HD239710 · HD239712 · HD239724 · HD239725 · HD239727 · HD239729 · And 54 more.

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Elephant Trunk Nebula: 6-panel mosaic

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Elephant Trunk Nebula: 6-panel mosaic

With the 2022 grantwriting season done, I can catch back up on my astro posts. :-)

This tests the new built-in mosaic planning in the ASIAIR, as a 6-panel plan on the Elephant Trunk Nebula and region. I found stitching this mosaic together was much more challenging than expected: because so much of the panels are filled with nebulosity, Astro Pixel Processors' normalization had a hard time getting it right. I ended up using LNC (degree 1, 4 iterations) and a lot of finesse in the gradient removal tool, but it came together.

As most dual narrrowband mosaics, I extract and process Ha and [OIII] in each panel separately, form Ha and [OIII] mosaics, and then combine in HOO.

The first image is shown at half resolution, but all work was done at 1.2"/pixel with my AT115EDT, with no star reduction, and light denoising and touchup in noiseXterminator and Topaz.

The other images show full resolution details on regions of interest. I hope you enjoy! I'll definitely need to revisit next summer when it's higher in the sky!

Final
Original
B
C
D
E

B

Title: Full-resolution detail in the north

Uploaded: ...

C

Title: Full resolution detail on the south

Uploaded: ...

D

Title: Full resolution zoom on the trunk

Uploaded: ...

E

Title: RGB processing (half resolution)

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	6532910
PixInsight job	Z8XNO09NRITN8VN0NPT0W8QPLR0Q6Z35
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h39m36s.44
RA (top/left)	21h53m02s.11
RA (top/right)	21h25m23s.12
RA (bottom/right)	21h27m27s.90
RA (bottom/left)	21h52m36s.86

Dec (center)	+57°39′53″.0
Dec (top/left)	+59°26′36″.6
Dec (top/right)	+59°19′25″.5
Dec (bottom/right)	+55°48′29″.8
Dec (bottom/left)	+55°54′29″.4

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Elephant Trunk Nebula: 6-panel mosaic

Elephant Trunk Nebula: 6-panel mosaic

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Elephant Trunk Nebula: 6-panel mosaic

Elephant Trunk Nebula: 6-panel mosaic

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