> ## Content Index > Fetch the complete content index at: https://www.phillipsastro.com/llms.txt > Use this file to discover other available public pages before exploring further. # A Continent in Cygnus - URL: https://www.phillipsastro.com/a-continent-in-cygnus/ - Published: 2026-09-13T03:08:17.000Z - Updated: 2026-09-13T17:04:53.000Z - Author: Fred Phillips - Tags: Emission Nebula, HaRGB, Mosaic About 2,600 light-years away in Cygnus, a single cloud of glowing hydrogen well over a hundred light-years across wears three different names: the North America Nebula, the Pelican Nebula, and the rarely mentioned IC 5068\. The "coastlines" that earned those names are the silhouette of a dark cloud sitting in front of the glowing gas, and the star that lights the entire complex is hiding inside that darkness. That's why this one had to be a mosaic. A single RedCat 91 frame covers about 3° × 2°, which is enough for the North America Nebula on its own or the Pelican on its own, but never both with room to breathe, and IC 5068 always ends up cropped off the bottom. Four panels and 92 hours later, this is the whole Sh2-117 complex in one frame: the continent, the bird, the forgotten third, and the dark cloud that shapes all of them. ## **The Field** ![](https://storage.ghost.io/c/46/30/4630167c-48bb-4312-aa07-f6b49ca096c6/content/images/2026/09/NGC7000_Final_Full_annotated.jpg) ****The full Sh2-117 complex: North America Nebula left, Pelican top center, IC 5068 right, with the dark Gulf of Mexico between them** \- HaRGB North is toward the upper left in this rotation, so the continent is lying on its side. The North America Nebula fills the left third of the frame, and the brightest thing in it is the sharp, jagged rim along its lower edge: the Cygnus Wall, the nebula's "Mexico and Central America," facing the Pelican across a dark bay. That bay is LDN 935, the Gulf of Mexico, and it's the most important feature in the picture even though it emits nothing. It's a cold molecular cloud between us and the glowing gas, and its outline is what carves one continuous nebula into a continent and a bird. In the northern half of the continent, toward the upper left, two sparse open clusters, NGC 6996 and NGC 6997, sit inside the glow. Against a Milky Way star field this dense you would never pick either one out without the labels. The Pelican rides above center with its head at the top of the frame, beak curling back toward the continent, and a bright ridge running down its neck where the gas is being lit and eroded. The two naked-eye stars at the bird's head and neck are 56 and 57 Cygni. Off to the right, IC 5068 is a softer, wider sheet of hydrogen crossed by dark bands, the piece of the complex that almost everyone crops out. The orange star at lower left is ξ Cygni, a magnitude-3.7 K-type giant. At roughly 1,200 light-years it's a foreground bystander, sitting less than half the distance to the nebula, and it's also your naked-eye anchor for finding all of this. Deneb sits just off the top edge of the frame, and for decades it got the credit for lighting the whole region, which turned out to be wrong. More on the real culprit below. ## **The Cygnus Wall** ![](https://storage.ghost.io/c/46/30/4630167c-48bb-4312-aa07-f6b49ca096c6/content/images/2026/09/NGC7000_Final_Feature1.jpg) ****The Cygnus Wall: a 20-light-year ionization front eating into the molecular cloud** \- HaRGB This is the brightest, most textured structure in the whole complex, and you can read the physics right off the crop. The wall is the shoreline where ultraviolet light from the ionizing star meets the dense molecular cloud. Everything on the bright side has been stripped of its electrons and glows in Hα; everything on the dark side is still cold gas and dust. The rim is bright precisely because the front is compressing the cloud as it advances, and that compression is squeezing out new stars. Look at the dark knots and scallops along the edge: those are the dense pockets resisting the erosion, and several of them have young stars buried inside that only infrared telescopes can see. The whole ridge is about 20 light-years long, and the Hα channel pulls out fine tendrils along it that the RGB data alone would have smoothed into a soft pink glow. ## **The Pelican's Front** ![](https://storage.ghost.io/c/46/30/4630167c-48bb-4312-aa07-f6b49ca096c6/content/images/2026/09/NGC7000_Final_Feature2.jpg) ****The Pelican's head and neck, where an ionization front is carving pillars out of the cloud** \- HaRGB The bright edge running down the Pelican's neck is the same kind of front as the Cygnus Wall, but here it's working into the cloud from the side, and you can see the results in the shape of the edge itself. The front erodes the cloud the way a tide works a beach: the soft material goes first, and the dense clumps get left behind as pillars pointing back toward the light source. This is one of the more active star-forming corners of the complex. At the tips of several of these pillars are young stars firing jets, most famously HH 555, a bipolar jet blasting out of a newborn star at the very tip of one of them. At the RedCat's 1.73″ per pixel you won't resolve the jet, but the pillars it lives in are right there in the crop, and the dark mottling behind the front is the reservoir of cloud the Pelican is still being carved from. ## **The Gulf of Mexico** ![](https://storage.ghost.io/c/46/30/4630167c-48bb-4312-aa07-f6b49ca096c6/content/images/2026/09/NGC7000_Final_Feature3.jpg) ***LDN 935, the dark cloud that draws the coastlines, and the hiding place of the star lighting everything** *\- HaRGB* This is the quietest part of the image and also the most interesting one. LDN 935 is a foreground molecular cloud, and its silhouette is the only reason we see a continent and a bird instead of one big blob. For a long time the obvious question was: what's powering all this? A nebula this bright needs a hot O-type star, and there wasn't one in sight. Deneb, just off the top of the frame, was the usual suspect, but it's an A-type supergiant, too cool and too far off to the side to do the job. The answer only turned up in 2005, when astronomers went looking in the infrared and found an O-type star buried inside this dark cloud, behind roughly ten magnitudes of dust, dimmed by a factor of about ten thousand in visible light. They nicknamed it the Bajamar Star, from the old Spanish name that gave the Bahamas their name, for roughly where it sits on the map. Later spectroscopy suggests it's actually a close pair of massive stars. So the culprit was at the scene the whole time, just standing in the dark. ## **IC 5068** ![](https://storage.ghost.io/c/46/30/4630167c-48bb-4312-aa07-f6b49ca096c6/content/images/2026/09/NGC7000_Final_Feature4.jpg) ****IC 5068, the third member of the complex, striped by foreground dust lanes** \- HaRGB IC 5068 doesn't have a nickname, and it's rarely imaged on its own, which is a shame because it's a lovely piece of sky. It's a broader, gentler sheet of ionized hydrogen a couple of degrees south of the Pelican, still part of the same Sh2-117 complex and lit by the same hidden star, but without the sharp fronts of its two famous neighbors. What it has instead are the dark bands: long lanes of foreground dust that cross it like bars across a window, with a brighter ribbon of hydrogen running between them. When I planned the mosaic I deliberately nudged the center so these lanes would land inside a panel overlap rather than on a seam, and the payoff is that the whole region reads as one continuous cloud instead of a tile. There's also a small, isolated puff of Hα in the top right corner of the frame, well away from everything else, that I haven't chased down yet. ## **Finding It** ![](https://storage.ghost.io/c/46/30/4630167c-48bb-4312-aa07-f6b49ca096c6/content/images/2026/09/skyymap.png) Between Deneb and ξ Cygni, at the tail of the Swan The complex sits in Cygnus at roughly RA 20h 55m, Dec +43° 30′ for the center of the mosaic, with the North America Nebula itself at RA 20h 59m, Dec +44° 31′. Finding it is easy. Locate Deneb, the tail star of the Swan and the top-left star of the Summer Triangle, then find ξ Cygni about 4½° to its east-southeast. The entire complex lies along that line, with the Pelican near the midpoint and the North America Nebula closer to ξ Cyg. Under a dark sky it's visible to the naked eye as a brighter patch in the Milky Way, and it's a showpiece in binoculars. From Starfront's latitude of 31.5°N it transits at about 78° altitude, nearly overhead, crossing the meridian around midnight in mid-August and in the mid-evening by late September. Best months are June through October, with July through September the sweet spot. ## Acquisition Details ![](https://storage.ghost.io/c/46/30/4630167c-48bb-4312-aa07-f6b49ca096c6/content/images/2026/07/B8-K4_Fred-Phillips.png) William Optics Cat 91 - Starfront Observatories 📷 Exposure Plan | **Filter** | Exposure | Subs | | ---------- | -------- | ---- | | **Ha** | 300s | 356 | | **Red** | 180s | 417 | | **Green** | 180s | 419 | | **Blue** | 180s | 420 | 🔭 Equipment | **Equipment Type** | Equipment | | ----------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Telescope** | Redcat 91 | | **Imaging Camera** | ZWO ASI2600MM Pro | | **Mount** | ZWO AM5N | | **Filters** | Antlia 3nm (S,H,O) | | **Accessories** | ZWO CCA, ZWO EFW (7x2"), ZWO EAF, DeepSkyDad FP2 | | **Capture Software** | [N.I.N.A.](https://nighttime-imaging.eu/?ref=phillipsastro.com) | | **Processing Software** | [Pixinsight](https://pixinsight.com/?ref=phillipsastro.com), [RC Astro](https://www.rc-astro.com/?ref=phillipsastro.com), [SetiAstro](https://www.setiastro.com/?ref=phillipsastro.com) | 💻 Processing **⚙️ WBPP**calibrate · register · integrate · each panel, each filter **🧹 GraXpert**gradient removal · each panel **✂️ Trim Mosaic Tile**clean panel edges **🗺 MosaicByCoordinates**4 panels registered · per filter **🧵 PhotometricMosaic**seam-blended masters · Hα R G B **🎨 Channel Combination**R G B → RGB **🧹 DBE**RGB and Hα **🌈 SPCC**RGB color calibration **🔭 BlurXTerminator**RGB and Hα **🔇 NoiseXTerminator**RGB and Hα · linear **✂️ StarXTerminator**RGB: stars kept · Hα: stars discarded ⭐ Stars **RGB Stars**from the RGB StarX pass **Star Stretch** **✔ Stars done**parked until the end 🌌 Starless nebula **MAS**RGB starless · main stretch **GHS**Hα starless · main stretch **Light Curves**RGB · saturation and S-curve **Image Blend**colorize Hα with RGB **🌠 Screen Stars**stars + starless recombined **🖼 Final Image**4-panel HaRGB mosaic [Full Details on Astrobin](https://app.astrobin.com/u/PhillipsAstro?i=7z3wdw&ref=phillipsastro.com) [![](https://storage.ghost.io/c/46/30/4630167c-48bb-4312-aa07-f6b49ca096c6/content/images/2026/07/Dark-H-Starfront-72.webp)](https://starfront.space/?ref=phillipsastro.com) **Shot remotely from Starfront Observatory in Rockwood, Texas - Building 8.*