This is officially the widest field I've shot with the S30 Pro. It's the Elephant's Trunk Nebula and the whole IC 1396 complex it's tucked inside of, way out in Cepheus. I grabbed this back in June with the scope's dual-band filter running out at Starfront, and honestly it sat in my library for months because I couldn't find a way to process it that actually showed what's in it. Running it through AstroWizard's Hubble Palette mapping is what finally cracked it open — a target that's basically one shade of red in natural color turned into something with real structure you can actually read.
What You're Actually Looking At 🔭
IC 1396 is one of the biggest emission nebulae in the northern sky — something like 3° across, which is roughly six full moons side by side, sitting around 2,400–3,000 light-years away in Cepheus. It's so faint and spread out that it barely registers to the eye or a short exposure; it only opens up with real integration time, which is exactly why the dual-band filter earns its keep here.
The cluster of bluish-white stars right of center is Trumpler 37, a young open cluster — the stars actually doing the work of lighting up this entire cloud. Their radiation and stellar winds are what's carving and ionizing all the gas around them.
Scattered through the gold haze are small dark, comma- and tadpole-shaped blobs — those are Bok globules, dense pockets of cold gas and dust silhouetted against the brighter nebula behind them. Some of those are actively collapsing into new stars right now.
Lower right, right next to Trumpler 37, is the feature the whole nebula is named for: the dark, finger-like pillar with the bright blue-white rim is the Elephant's Trunk itself (cataloged as IC 1396A, or vdB 142) — a pillar of dense gas and dust roughly 20 light-years long, being slowly eroded by radiation from the cluster. There's active star formation happening inside that trunk right now, completely hidden from view.
The bright white-gold star up in the top left is almost certainly Mu Cephei — Herschel's Garnet Star — one of the largest and most luminous stars visible to the naked eye, sitting just outside the nebula's edge. It's famous for being one of the reddest stars you can see without a telescope, which is not really what you'd guess from this frame — more on why in a minute.
Dual-Band, Not Full SHO — and Why That's Still Plenty
Worth being straight about what this actually is: the S30 Pro's built-in dual-band filter isolates two narrow slices of light — hydrogen-alpha (the red line almost every emission nebula glows in) and oxygen-III (a blue-green line from hotter, more ionized gas). That's two channels, not the three separate filtered exposures — sulfur, hydrogen, oxygen — that make up a "true" Hubble Palette on a dedicated mono rig.
For a target this size and this faint, one-shot dual-band was really the only realistic path with a setup like the S30 Pro. Running three separate filters across a 3°-wide field would mean multiple full nights of data just to get through calibration, let alone signal.
What the Hubble Palette Is Actually Doing to This Photo 🎨
The classic Hubble Palette remaps sulfur to red, hydrogen-alpha to green, and oxygen-III to blue, then rebalances the whole thing toward that recognizable gold-and-teal look. The reason it exists at all: our eyes are dramatically better at telling apart different colors across the spectrum than they are at telling apart different shades of the same color.
In pure natural color, almost this entire frame would read as one near-uniform pink-red haze. Hydrogen-alpha dominates so heavily that the boundary between two clouds with genuinely different gas compositions just disappears into the same red. Remapping the channels pulls those differences back into view. The broad gold-brown wash across most of this frame is where hydrogen (and the synthesized sulfur-like signal) dominates — the bulk of the nebula's mass and dust. The cooler blue-teal edges, most visible right around Trumpler 37 and rimming the trunk itself, are where oxygen-III is strongest — the gas closest to, and most energized by, the cluster's hottest stars.
That blue rim wrapping the Elephant's Trunk is the ionization front — literally the boundary where the cluster's radiation is actively stripping gas off the pillar right now. In natural color it would just blend into the same red haze as everything around it. Here it's a distinct edge you can actually trace with your eye.
How AstroWizard Got Me There 🧙
Off the stack, this was dual-band OSC data — one color channel per pixel, not three separate narrowband subs. AstroWizard's "OSC Dual-Band to Hubble" palette mapping is what took that Ha/OIII data and remapped it into the gold-and-teal Hubble look, synthesizing the missing third channel instead of just doing a flat RGB swap (which is the flat-green mess you get if you try to fake this without the right tool).
After the palette conversion, it was the same walk-through I always do: gradient removal first — with this much of the frame being genuinely faint background nebulosity rather than empty sky, getting an even background actually mattered more here than on a tighter target — then the narrowband-specific color tuning to balance the gold against the teal, and the usual sharpen, denoise, stretch, and beautify pass before export. This was the first time I really leaned on AstroWizard's narrowband-specific tools instead of just running the default color workflow, and it walked me through it exactly the same way it does everything else — no separate manual for "now do narrowband."
"In natural color, this whole frame is basically one shade of red. The Hubble Palette is what let me actually see it."
This is easily the widest, faintest target I've pointed the S30 Pro at, and I'm already thinking about going back for a second, deeper pass on just the trunk itself now that I know the palette mapping works this well on dual-band data. If you've got a Seestar S30 Pro or S50 with a dual-band filter sitting on a shelf, IC 1396 is a genuinely rewarding target to point it at — just budget real integration time, because this one does not come easy.
Tool used: AstroWizard