Another Cosmic Flower, This One in Cygnus

 

I spent a few clear nights recently photographing one of my favorite deep‑sky objects: the Tulip Nebula (SH2-101), a beautiful cloud of glowing gas tucked away in the constellation Cygnus. It’s called the Tulip because of its curved, petal‑like shape — and once you see it, the name makes perfect sense.

This nebula is about 6,000 light‑years away, but with the right equipment and a little patience, you can capture its delicate structure from right here on Earth.

How I Captured It

For this image, I used a small refractor (AT102ED) telescope and a monochrome astronomy camera (QHY163M) paired with special filters that isolate two types of glowing gas:

• Hydrogen‑alpha (Ha): shows the bright red “petals”

• Oxygen‑III (OIII): reveals the softer blue wisps around the edges

These filters let me photograph the nebula even when the Moon is bright, because they cut through most of the skyglow.

I took many long exposures over several nights, then combined them into a single image. It’s a slow process, but that’s part of the fun — watching the nebula slowly emerge from the darkness.

A Little Processing Magic

To keep the image clean and balanced, I used a tool called StarNet, which separates the stars from the nebula. This lets me work on each part independently:

• The nebula gets careful stretching and contrast adjustments to bring out the fine details.

• The stars get their own gentle processing so they stay natural and not overpowering.

Once both look right, I blend them back together. It’s a simple step that makes a big difference in clarity.

The Final Result

The finished image shows the Tulip Nebula glowing softly in red and blue, surrounded by a dense field of stars. The hydrogen forms the bright central bloom, while the oxygen adds a cool halo around it. It’s one of those objects that feels both delicate and powerful — a cosmic flower floating in the Milky Way.

Astrophotography is a mix of science, patience, and a little artistic touch, and this nebula is a perfect example of how all three come together.

Eastern Veil Nebula – New Process, New Results

 

I finally had a chance to revisit the Eastern Veil Nebula with a fresh set of processing tools and a more refined workflow, and I’m really happy with how this one turned out. This is one of those targets that never gets old — the delicate filaments, the shock‑wave structure, and the way the colors weave together make it a perfect playground for narrowband imaging.

For this version, I leaned into a cleaner Ha/OIII balance to keep the structure crisp without pushing the colors too far. I also was able to capture a few, much cleaner Oiii frames. The OIII really shines in the outer arcs, giving that electric blue glow, while the Ha brings out the warm, detailed filaments running through the center.

This was captured with my AT102ED and QHY163M using Ha and OIII filters, and processed in Photoshop with my usual blend of curves, selective color, and star control. It’s always fun to see how much detail can be pulled out with just a bit of patience and a careful stretch.

I think this is my favorite Eastern Veil so far.

Processing the Tulip Nebula in Narrowband: My Workflow Explained

Astrophotography is full of complicated techniques, but the actual workflow doesn’t have to be intimidating. In this post, I’m going to walk through a basic description as to how I process my narrowband images using the Tulip Nebula (Sh2‑101) as an example. This is a beautiful emission nebula in Cygnus, rich in hydrogen‑alpha (Ha) and faint oxygen‑III (OIII) structures.

This isn’t meant to be a universal guide — it’s simply the method that works for me, and the one I used to produce my most recent Ha master of the Tulip.

It is in black and white  because only one color (red) has been imaged so far...  This will eventually become the red part of the final image after all of the colors are imaged.

For this project, I captured:

• 34 Ha frames

• 240 seconds each

• Stacked in DeepSkyStacker

That gives me a little over 2 hours of Ha, which is plenty for this target. The Tulip has strong Ha emission, so even a couple hours produces a clean, detailed master with good structure.

I’ll be adding OIII on a moonless night, since the OIII signal in the Tulip is faint and easily washed out by skyglow. These Ha frames were taken during a full moon.

Untouched stacking result

This is actually what I initially have to work with. You cant see the nebula whatsoever, and only a few of the brighter stars, but as you read on, everything I need is actually in this image, and I'll explain how to bring out the stuff you cant see here.

The next thing I do is to bring this image into photoshop, and using the levels adjustment, I'll increase the brightness so I can just barely see the brighter parts of the nebula. This initial stretch also brightens the stars substantially without blowing them out and bloating the stars. This is what I end up with:

Initial stretch

This image is then processed in Starnet. Starnet will output an image with the stars removed, but keeps the rest of the image intact. This allows me to process the nebula separately without the stars, which eliminates star bloat. I now have 2 images, the original image with the stars and one without. I stretch, sharpen lightly and reduce noise- there's always some... until I get something like this:

Starless image processed

Once the starless image is looking close to how I want the nebula, ill add the stars.  To do that, I'll copy the image that I fed into Starnet as a new photoshop layer and set the layer mode from normal to lighten.  A lot of guys like to change it to Screen, but I find that adds a lot of overall brightness and adds noise which I'll have to remove later.  

Once the stars are copied, I'll then slightly crop the image to eliminate any dark border that usually happens because of the initial imaging run.  This is a very tiny crop to get rid of the extreme outside of the frame.

Then I make some fine adjustments to the top layer, which is the star layer to brighten the stars to where I like how the stars look in the image, kinda like this:

Stars re-combined

From here, I will make mostly minor tweaks to the entire image.  Maybe a little more brightening, maybe a little more contrast enhancement, possibly a curves adjustment to pull out a little more of the very faint nebulosity.  These tweaks are usually pretty small, slight changes.  Possibly some noise reduction in Camera Raw filter, etc.  The goal is to end up with something that looks like this:

Final Ha image

Notice I rotated the image in the final processing. This last image has its orientation with North up. As you can see, this image really isnt too much different from the previous image, as all the big enhancements were done before the starless and the stars merge.

This image I consider ready for some Oxygen and RGB star color frames to be added. I do not have those taken yet, and will do soon my next imaging run.

I should also mention that not only did I capture the nebula, but I also got the area near a fairly nearby black hole. Of course, a black hole cannot be imaged directly, but this is a black hole with astar orbiting it, and I did get the star in the image. That system is cataloged as "Cygnus X1".

Here is an image with an arrow pointing to that system.

Chasing the Eastern Veil: A Delicate Ghost in the Summer Sky

 

There are some deep-sky objects that look impressive in almost any photograph. The Eastern Veil Nebula isn't necessarily one of them—at least not when you first look at the raw data.

It is faint. Very faint.

But once the signal begins to emerge, the Eastern Veil reveals an incredible network of delicate filaments, wisps, and arcs stretching across the field. This is one of those targets where the more data you collect, the more there seems to be hiding in the darkness.

The Target

The Eastern Veil is part of the enormous Veil Nebula complex in the constellation Cygnus. The entire Veil is the remnant of a massive supernova explosion that occurred thousands of years ago.

What we're seeing today is essentially the expanding shock wave from that explosion interacting with the surrounding interstellar gas. The result is an enormous web of glowing filaments.

The Eastern Veil contains some particularly beautiful structures, including NGC 6992, NGC 6995, and the surrounding faint nebulosity. Through a telescope, however, much of that structure is extremely difficult to see. Narrowband astrophotography changes the game.

And that's exactly what I was after with this image.

The Imaging Session

For this project I used hydrogen-alpha and oxygen-III filters, with 240-second exposures.

The initial dataset consisted of:

• 18 × 240-second Ha
• 14 × 240-second OIII
• Total integration: 2 hours 8 minutes

Unfortunately, clouds moved through the area during the OIII portion of the session. Several OIII frames had to be discarded rather than allowing compromised exposures into the final stack.

That left me with considerably less OIII data than I would have liked.

The difference between the two channels was immediately apparent. The hydrogen-alpha signal came through relatively strongly, while the OIII was considerably fainter and noisier.

Rather than trying to force the OIII data during processing, I decided the better solution was simply to collect more of it.

Learning From the Noise

One interesting part of this image was discovering just how much difference proper calibration could make.

My first version was processed without calibration frames. I used a plugin called Astro Flat Pro to deal with vignetting and amp glow, and it did a surprisingly good job.

The resulting image contained plenty of detail, but the background was extremely noisy. There were also numerous tiny bright points scattered throughout the image.

I suspected that some of those could be warm or hot pixels rather than actual stars.

So I went back and took 50 dark frames at the same 240-second exposure length and recalibrated the data.

The difference was noticeable.

The background became cleaner and more uniform, and some of the tiny artifacts disappeared. More importantly, I could see that the underlying nebular data was actually quite good. The problem wasn't a lack of detail—it was the signal-to-noise ratio.

That was an important lesson from this image: sometimes the best processing tool is simply more photons.

The Ha and OIII Balance

The Eastern Veil is a particularly good target for a narrowband approach because the different emission lines reveal different aspects of the structure.

The hydrogen-alpha channel provides the strong red emission that defines much of the nebula, while OIII contributes the blue-green/cyan structures.

In this image, the Ha signal is currently stronger than the OIII. That's partly because I ended up with only 14 usable OIII exposures.

The OIII filaments are there, though—and that's what makes me want to collect more.

My plan is to add another 10–16 OIII exposures, bringing the OIII integration up toward 1½–2 hours. I don't think I need substantially more Ha at this point.

More OIII should allow me to bring out the blue-green filaments without having to push the OIII data so hard that the background noise becomes distracting.

A Work in Progress

This isn't quite the final version.

And that's actually one of the things I like about astrophotography.

The image already contains a tremendous amount of structure, but I know there's more buried in the data. Rather than trying to extract everything from a noisy stack, I'm going to let the telescope do the work.

More OIII.

More signal.

A cleaner stack.

Then I'll start the final processing again.

The Eastern Veil is a perfect example of why patience matters in deep-sky imaging. A few hours of exposure can reveal something beautiful, but adding another hour—or two—can transform the way the image can be processed.

For now, this version gives me a pretty good preview of what's waiting in the final dataset.

And judging by the delicate filaments already visible, I think the Eastern Veil is going to be worth the extra time.

Capturing the Cosmic Flower: Imaging the Iris Nebula (NGC 7023)

There is something inherently captivating about dust in deep-space astrophotography. While crisp emission nebulae glowing in hydrogen-alpha offer striking red contrast, reflection nebulae present a far subtle, delicate challenge. Recently, I set my sights on NGC 7023, the Iris Nebula—a stunning dusty reflection nebula located roughly 1,300 light-years away in the constellation Cepheus.

The Target: A Stellar Diamond in the Dust

Unlike glowing emission clouds powered by ionized gas, the Iris Nebula shines by reflecting the light of a massive, bright central star (HD 200775) embedded within a vast cosmic dust cloud. The central blue "petals" spill into faint, rusty brown filaments of dark interstellar dust stretching across the field of view. To capture that delicate blue glow alongside the dark surrounding dusty structures requires steady skies, good signal-to-noise ratio, and patient processing.

The Setup & Capture Strategy

To frame the nebula's central core while retaining surrounding dust, I brought out the broad-spectrum RGB setup:

• Telescope: Astro-Tech AT102ED refractor

• Camera: QHY163M monochrome CMOS

• Exposures: 50–60 second RGB sub-exposures

Rather than running a dedicated Luminance filter—which can easily overwhelm or bleed out the bright central star's core—I decided to shoot exclusively short RGB exposures. This strategy preserved star color and helped manage star halos early in the capture phase.

In the Processing Lab: Unlocking the Blue Petals

Bringing out fine dust while keeping stars tight and noise under control is always a balancing act. Working with raw FITS data and TIFF exports, my processing workflow focused heavily on separation and local contrast:

1. Star-Nebula Separation: Using StarNet to separate the background nebula from the star field allowed independent processing of the faint, dusty structural layers without bloating the stars.

2. Managing Halos: The bright central star, HD 200775, likes to leave its mark. To tame unwanted star halos around the bright stellar core, selective adjustments in Photoshop—specifically desaturating and darkening the magenta channel—kept the central region clean.

3. Layer Blending & Noise Control: I process the object by creating a "Starless" image of the object using a program called "Starnet".  Combining the StarNet layer and the original image with the stars using a Lighten blend mode to preserve subtle dusty details while keeping background noise artifacts in check before applying final curves and stretch actions.  

I have  never been able to get this much of the surrounding dust in previous images of the Iris, so I'm really happy with how this one turned out.

The Crescent Nebula — NGC 6888

 

The Crescent Nebula has always been one of those objects that seems to reveal more the longer you spend imaging it. At first glance, it is an interesting, crescent-shaped nebula surrounded by a field of stars. But once enough exposure is collected and the image is stretched, a much larger structure begins to emerge around it.

This image was another narrowband project, using hydrogen-alpha and oxygen-III to bring out both the bright Crescent and the much fainter nebulosity surrounding it.

Equipment Used

• Astro-Tech AT102ED refractor

• Field flattener

• QHY163M monochrome camera

• QHY CFW3M-SR filter wheel

• Astronomik H-alpha and OIII filters

• ZWO EAF electronic focuser

• Orion guide scope and guide camera

• Sky-Watcher EQ-AL55i Pro mount

• NINA for image acquisition and sequencing

• PHD2 for guiding

The main data for this image came from four-minute narrowband exposures. I spent additional time on the H-alpha channel because the surrounding hydrogen emission is surprisingly extensive. The goal wasn't simply to produce another close-up of the Crescent, but to preserve as much of the surrounding structure as possible.

And that's what I really like about this image.

The Crescent itself is relatively small in the field, but the surrounding nebulosity fills a huge portion of the frame. There are faint, twisting curtains and filaments of hydrogen extending well beyond the bright central nebula. Some of that structure is extremely subtle and would be easy to lose during processing.

I also wanted to keep the OIII contribution fairly natural. The blue-green emission around the Crescent gives the nebula some additional depth without overpowering the extensive red hydrogen emission.

About the Crescent Nebula

The Crescent Nebula, cataloged as NGC 6888, is located in the constellation Cygnus, roughly 5,000 light-years from Earth.

What makes the Crescent particularly interesting is that it isn't simply a cloud of gas illuminated by nearby stars. The nebula was created largely by the interaction between the powerful stellar wind from a massive Wolf-Rayet star and material that the star had expelled during an earlier stage of its life.

The Wolf-Rayet star, WR 136, is an enormous, extremely hot star that is nearing the end of its stellar life. Its incredibly powerful stellar wind is traveling outward at thousands of kilometers per second. That wind is running into material the star lost earlier in its evolution, compressing and heating the gas and producing the glowing shell we see as the Crescent.

The result is this remarkable bubble of energized gas.

And when viewed through narrowband filters, the Crescent becomes even more interesting. Hydrogen-alpha reveals the extensive red emission throughout the region, while OIII brings out areas of ionized oxygen and gives portions of the nebula that characteristic blue-green appearance.

More Than Just a Crescent

One of the things I particularly enjoy about this image is that the Crescent isn't the entire story.

The bright nebula immediately catches your eye, but once you look around the frame, there is nebulosity almost everywhere. The enormous clouds and filaments surrounding NGC 6888 are part of the much larger complex of gas and dust occupying this region of Cygnus.

That's one of the reasons I decided to keep a relatively wide field of view rather than cropping tightly around the Crescent. The surrounding structure gives the image a sense of scale and shows just how much activity is taking place in this part of the Milky Way.

This was also a good example of why I enjoy narrowband astrophotography. Much of this nebulosity is far too faint to appreciate in a normal visible-light photograph, but with enough H-alpha and OIII exposure, it becomes possible to pull these incredibly delicate structures out of the darkness.

The Crescent may be the star of the show, but the faint nebulosity surrounding it is what makes this particular view interesting to me.

— Mike