North America Nebula - NCG7000 in SHO (Tom Dinneen)

North America Nebula - NCG7000 in SHO

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

The North America Nebula in Hubble palette (SHO). It's an emission nebula in Cygnus. Captured this in Bortle 4 skies (20.74 using my SQM-L). 18 x 300 sec Ha, 12 x 300 sec OIII and 8 x 300 sec SII. The difference in noise and detail between the Bortle 4 and my normal Bortle 7/8 light pollution even with narrowband filters (Baader 8nm) was pretty significant. The Ha in particular with only 18 subs was close to noiseless. The halo's around my OIII filters however were just as bad as in the city. So it's not light pollution causing it (or at least not solely responsible). Processing was light.

MureDenoised Ha, OIII and SII. Integrated all three channels into a Luminance. MaskedStretch. Then used the SHO-AIP script to combine and mixed the channels a bit. Applied an SCNR. Then HDRMultiscaleTransformation. Then a LocalHistogramEqualization and finally a light DarkStructureEnhance. Curves, Saturation and Hue all post processed in Photoshop.

Original
B
Final
C

B

Description: Reprocessed to give it a bit more bite. Used WeightedBatchPreProcessor to calibrate, register and integrate. Generated a combined Luminance using ImageIntegration. Applied a light Deconvolution to the Luminance (now that I know how to do it ;-). Then applied EZ Denoise to everything. Stretched everything manually using HistogramTransformation and then applied a LinearFit with Ha as a reference. Luminance then gets a mild sharpen with MultiscaleLinearTransform (with a Linear Mask enabled). ChannelCombination to combine into SHO. SCNR to remove green. Inverted and applied SCNR to help remove magenta halo's. CurvesTransformation to apply some contrast and little saturation boost. Then LRGBCombined it with the Luminance. Some more CurvesTransformation to apply some contract and more saturation. Finally a HDRMultiscaleTransform, LocalNormalization and a light DarkStructureEnhance.

Uploaded: ...

C

Description: Reprocessed the same data with some new Photoshop techniques. Created separate luminosity from combined Ha, OIII and SII. Used Nik Collections for selective sharpening and contrast adjustment.

Uploaded: ...

Trevinca Skies

	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	3818815
PixInsight job	EP5EJHQO8CTIWJX9DFD01SLRS4N0KOLA
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h59m20s.77
RA (top/left)	21h03m47s.64
RA (top/right)	21h04m00s.80
RA (bottom/right)	20h54m43s.63
RA (bottom/left)	20h54m51s.71

Dec (center)	+44°30′49″.0
Dec (top/left)	+43°24′53″.8
Dec (top/right)	+45°35′46″.6
Dec (bottom/right)	+45°36′03″.4
Dec (bottom/left)	+43°25′12″.3

Image Index:

Contribution Index (beta):