Every August, Cygnus climbs high into the night sky. Near Deneb lies a vast but relatively faint emission nebula whose outline bears a striking resemblance to the North American continent, complete with the Gulf of Mexico and Atlantic coastline.
This is the North America Nebula (NGC 7000), located roughly 2,600 light-years away. Spanning an enormous area of the sky, it is one of the classic targets for wide-field deep-sky astrophotography.
In this imaging project, astrophotographer Vioce shares his experience capturing NGC 7000 with a dual-rig setup built around two ToupTek Astro HOPE D60 astrographs, paired with SkyEye62AM and SkyEye62AM Plus.
The result came from three nights of imaging and a total integration time of approximately 40 hours.
Why Use a Dual-Rig Setup for the North America Nebula?
The North America Nebula is huge.
Capturing its overall structure while still revealing the intricate details within the surrounding hydrogen clouds can be challenging, especially when working within limited clear-sky windows.
With a single imaging system, collecting enough Hα, OIII, and SII data for a detailed SHO image can require many nights of exposure.
So instead of relying on one telescope, Vioce placed two HOPE D60 astrographs side by side, creating a compact dual-rig imaging system.
One HOPE D60 was paired with the SkyEye62AM Plus, while the other used the SkyEye62AM full-frame monochrome cooled camera.
By running both systems simultaneously, the setup could collect different narrowband channels at the same time, dramatically increasing data acquisition efficiency.
HOPE D60: A Wide-Field Match for NGC 7000
The HOPE D60 is a five-element PAPO astrograph featuring:
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60mm aperture
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280mm focal length
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f/4.66 focal ratio
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Integrated field-flattening design
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Full-frame image-circle coverage
The combination of a 280mm focal length and a full-frame sensor produces a field of view of approximately 7.4° × 4.9°.
That wide field was particularly useful for this project.
Rather than framing only NGC 7000 itself, the setup could include the North America Nebula, the neighboring Pelican Nebula (IC 5070), and SH2-119 within the same expansive composition.
For Vioce, this was exactly the kind of wide-field framing he wanted to achieve.
Two Full-Frame Mono Cameras, Three Narrowband Channels
For narrowband imaging, the two monochrome cameras were given clearly defined roles.
The SkyEye62AM Plus uses Sony's IMX455 back-illuminated full-frame monochrome sensor, delivering approximately 61 megapixels, 16-bit output, and read noise below 1e⁻ under suitable operating conditions.
Its two-stage TEC cooling system provides a cooling delta of up to 40°C, helping the sensor maintain a stable low operating temperature even during warm summer nights.
That stability becomes especially important during long narrowband imaging sessions, where consistent sensor temperature helps maintain clean and reliable data over many hours.
The monochrome sensor also brings an important advantage for narrowband astrophotography: without a Bayer color filter array, every pixel can directly contribute to collecting incoming light through the selected filter.
For this project, the two imaging systems divided the workload:
Rig A: Hα + OIII
Rig B: SII
With both telescopes imaging simultaneously, Vioce was able to gather more usable narrowband data within the same amount of observing time and eventually complete all three channels required for an SHO, or Hubble Palette, composition.
Three Nights and 40 Hours of Integration
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Camera: SkyEye62AM+SkyEye62AM Plus
Telescope: HOPE D60 × 2
Mount: FT20
Filter: ToupTek Astro 2'' LRGBSHO
Capture Settings: H 600s×60，O 600s×60，S 600s×120
Total Integration Time: 40h
The project continued across three nights.
Exposure after exposure, data from the Hα, OIII, and SII channels gradually accumulated until the final integration time reached approximately 40 hours.
In deep-sky astrophotography, 40 hours is more than just an impressive number on an imaging log.
Long narrowband integration allows faint structures that initially disappear into the background noise to build up frame by frame.
The bright hydrogen-emission regions become more defined. Fine filaments and overlapping clouds of gas begin to separate from one another. Even the much fainter interstellar material surrounding the main nebula gradually emerges from the darkness.
This is where long integration time, efficient data collection, and a stable imaging system begin to show their value.
From Seeing the North America Nebula to Seeing Inside It
One of the most appealing things about NGC 7000 is how recognizable it is.
At first glance, the familiar outline of the North American continent immediately stands out.
But once you begin collecting deeper data, that familiar shape becomes only the beginning.
Behind the obvious coastline lies an intricate landscape of ionized gas, dark dust structures, delicate filaments, and faint surrounding nebulosity. The longer the exposure builds, the more complex the region becomes.
Perhaps that is one of the most fascinating parts of deep-sky astrophotography:
first you see the object, and then, little by little, you begin to truly see what is inside it.
For this 40-hour NGC 7000 project, the combination of two HOPE D60 wide-field astrographs，SkyEye62AM and SkyEye62AM Plus allowed Vioce to turn a limited number of summer nights into a rich three-channel narrowband dataset, capturing both the enormous scale of the North America Nebula region and the faint structures hidden within it.