Wide‑Field Astrophotography of Orion: Horsehead, Flame, and Orion Nebula in RGB + Hα

 Two clear Sundays in a row ...

Orion is one of the most popular constellations for astrophotography. With showpiece objects like the Orion Nebula and the Horsehead Nebula, you can’t go wrong pointing your telescope there on the few clear winter nights we get. Sunday, March 1st was forecast to be clear, so I slewed my telescope to the central spine of the Orion Molecular Cloud Complex — framing the Horsehead/Flame region and the Orion Nebula (M42/M43), with the Belt stars Alnitak and Alnilam anchoring the field.

The Moon was nearly full that night, so I used my Optolong L‑eXtreme filter to tame the bright sky. The following Sunday, March 8th, was also clear, but this time the Moon didn’t rise until after midnight. That gave me a chance to capture the field in broadband RGB with no filter. The final image is a composite of the RGB data from March 8th and the Hα extracted from the dual‑narrowband data from March 1st.

Image 1: RGB + Ha image of the central spine of the Orion molecular Cloud Complex

RGB + Ha image of the central spine of the Orion Molecular Cloud Complex captured from my backyard on 3/1/2026 & 3/8/2026.

What is it?

This field captures the central spine of the Orion Molecular Cloud Complex, one of the richest and most active star‑forming regions in the night sky. The combination of bright emission nebulae, dark dust clouds, reflection nebulae, and massive blue stars makes this area a favorite for both astrophotographers and professional astronomers.

Image 2: Annotated image

An annotated version of the image.

Prominent Objects in the Field

Horsehead Nebula (B33) - The Horsehead Nebula, also known as Barnard 33, is a dark nebula silhouetted against the red glow of the emission nebula IC 434. Its dense dust cloud blocks the background light, creating the distinctive horse‑head shape that makes it one of the most recognizable objects in the night sky.

Flame Nebula (NGC 2024) - The Flame Nebula is an emission nebula next to the leftmost star in Orion’s Belt, Alnitak. Dark dust lanes cut through the bright emission region, and smaller branches of dust radiate outward, enhancing its resemblance to a flickering flame.

Orion Nebula (M42) & De Mairan's Nebula (M43) - M42 is arguably the most popular target for amateur astronomers (both visual and astrophotography).  This area is a bright H II region and an active stellar nursery. M42 is a massive star forming region and is (astronomically speaking) relatively close to the Earth. M43 is just north of M42. M42 and M43 are separated by a dark dust lane.

Running Man Nebula (Sh 2‑279) – The Running Man is a combination of emission and reflection nebulae located just north of M42 and M43. Bright blue starlight reflects off surrounding dust while faint H II emission fills the background, creating the distinctive “running” silhouette that gives the nebula its name. 

Alnitak and Alnilam - Alnitak is the leftmost star and Alnilam is the middle star in Orion's belt. Both stars are bright Type O/B stars. 

How big is it?

For reference, the Moon has an apparent size of 31 arcminutes.

Horsehead Nebula (B33) - The Horsehead Nebula has an apparent size of 6 x 4 arcminutes on the sky with an actual diameter of 2.8 light-years (ly). 

Flame Nebula (NGC 2024) - The Flame Nebula has an apparent size of 30 x 30 arcminutes on the sky with an actual diameter of 7.1 ly.

Orion Nebula (M42) & De Mairan's Nebula (M43) - M42 has an apparent size of 85 x 65 arcminutes on the sky with an actual diameter of 34.7 ly. M43 has an apparent size of 20 x 15 arcminutes on the sky with an actual diameter of 10.2 ly.

Running Man Nebula (Sh 2-279) - The Running Man Nebula has an apparent size of 40 x 25 arcminutes on the sky with an actual diameter of about 15 ly.

How far is it?

Distance estimates for the Nebulae in this image range from 1,260 to 1,600 ly from Earth.

Alnitak is about 740 ly and Alnilam is about 2,000 ly from Earth.

How to find it?

Refer to the red rectangle in the finder chart below. 

Let's start with the easiest objects to find, Alnitak and Alnilam. Alnitak is the leftmost star and Alnilam is the middle star in Orion's Belt. Both Stars are visible with just your eyes, and can be seen from just about anywhere.

Just below Orion's belt are three stars (maybe 2 depending on light pollution and sky conditions) known as His Sword. M42 is the middle "star" in the sword. Visible to the naked eye (light pollution and sky conditions depending) as a fuzzy star. Easily observed in binoculars and telescopes. 

The Horsehead is "easy" to find but very difficult to actually see (visually). Think of trying to see a black smudge on a black tablecloth. Although it is difficult to visually observe, it is relatively easy to image. To visually observe the Horsehead Nebula, a 10" or larger telescope, H-beta filter, and dark skies are required. The Horsehead is located about 1 degree south of the bright star Alnitak (the leftmost star in Orion's belt). 

Image 3: Finder Chart

Finder chart for the field.

Processing:

My goal with this image was to preserve natural star colors from the RGB data while using Hα to enhance the emission structures in IC 434, the Flame Nebula, and the extended nebulosity around M42. The workflow below reflects that balance.

Narrowband Workflow:

Linear Processing: 

• Gradient removed with MSG. 

• The narrowband image was aligned to the RGB image with Star Alignment. 

• The registered image was cropped using Dynamic Crop and the instance of the process was saved to the desktop so it could be used to duplicate the crop on the RGB image. 

• BlurXTerminator was used for deconvolution

• The stars were removed with StarXTerminator. (The narrowband stars were not saved)

• Noise was reduced with NoiseXTerminator. 

• The image was made non-linear with Generalized Hyperbolic Stretch. 

Non-linear processing: 

• The image was separated into the R, G, & B channels using Channel Extraction. 

• The R image was used as the Ha image and the B & G (Oiii) images were discarded.

RGB Workflow:

Linear Processing: 

• Gradient was removed with MSG. 

• The image was cropped to duplicate the narrowband images with the saved instance of Dynamic Crop.

• BlurXTerminator was performed in correct only mode. 

• Color calibration was performed with SPCC.

• BlurXterminator was used for deconvolution.

• The stars were removed (and saved) with StarXTerminator.

Starless linear processing:

• The image was made non-linear with Generalized Hyperbolic Stretch.

Starless non-linear processing: 

• The toolbox CombineHawithRGB script was used to blend the Ha into the RGB image.

• I used the CreateHDRImage script to tone down the core of the Orion Nebula.

• Image blend was used for sharpening by using the high pass filter. 

• CT was used to enhance color and color saturation.

Star Processing:

• Stars were stretched with Seti Astro's Star Stretch script.

• CT was used to enhance color and saturation.

Final Blend

• The stars were screened back into the starless image with PixelMath. 

Image Details:

Narrowband Image:

Capture Date: 03/01/2025

Location: Eden, NY

Telescope: Askar FMA180 Pro

Camera: ZWO ASI2600MC Pro

Filter: Optolong L-eXtreme

Mount: Sky-Watcher USA EQ6-R Pro

Exposure: 45 exposures @ 180 sec each for a total exposure of 2 hours and 15 minutes. All exposures were captured at Gain 100 / Offset 50 / -20°C each.

Software: NINA, SharpCap Pro, PHD2, and PixInsight

RGB Image:

Capture Date: 03/08/2025

Location: Eden, NY

Telescope: Askar FMA180 Pro

Camera: ZWO ASI2600MC Pro

Filter: N/A

Mount: Sky-Watcher USA EQ6-R Pro

Exposure: 108 exposures @ 60 sec each for a total exposure of 1 hour and 48 minutes. All exposures were captured at Gain 100 / Offset 50 / -10°C each.

Software: NINA, SharpCap Pro, PHD2, and PixInsight

Total Integration Time: 4 hours and 3 minutes

Clear Skies!

Ernie

The Horsehead and Flame on Super Bowl Sunday from the BMO

 First clear night in months ...

It has been a long time (several months) since I was able to image. Hope you enjoy this image of the Horsehead and Flame nebulae.

The Horsehead (B33/IC434) and Fame Nebula (NGC 2024) captured on 2/8/2026 at our club's observatory.

What is it? (written with AI assistance)

Horsehead Nebula — a dark dust cloud silhouetted against a glowing emission background. The feature in your image is the Horsehead Nebula, also cataloged as Barnard 33 and IC 434, a cold, dense pocket of gas and dust that blocks starlight and takes on the familiar horsehead shape. This dark nebula sits within the Orion molecular cloud complex and is a nearby site of ongoing low‑mass star formation.

Flame Nebula — a bright emission region of ionized gas. The Flame Nebula, cataloged as NGC 2024, is an H II region where energetic young stars excite hydrogen and other gases so they glow, producing the reddish emission that frames the area around Alnitak. This is an active star‑forming region with complex filaments and dust lanes that give the nebula its textured appearance.

Alnitak — the illuminating blue supergiant in the foreground. Alnitak is the easternmost star of Orion’s Belt and appears very bright in your frame; it lies in the foreground relative to the nebulae and contributes to the illumination and contrast of nearby clouds.

Reflection Nebulae and Surroundings — faint blue glows and dusty knots. Several smaller reflection nebulae such as NGC 2023 and cataloged IC objects scatter starlight and add subtle blue tones and structure across the field. Together with the Horsehead and Flame Nebulae, these objects form a compact, richly textured slice of the Orion molecular cloud complex that is a favorite target for astrophotographers.

---

Why it matters — this patch of Orion is a textbook example of how dust, gas, and young stars interact: dark silhouettes, glowing emission, and scattered reflection all appear in one frame, revealing different physical processes and stages of star formation.

An annotated version of the image.

How big is it?

The horsehead Nebula (B33) has an apparent size of 6 x 4 arcminutes on the sky with an actual diameter of 2.8 light-years (ly). For reference, the Moon has an apparent size of 31 arcminutes.

The Flame Nebula (NGC 2024) has an apparent size of 30 x 30 arcminutes on the sky with an actual diameter of 7.1 ly.

IC 434 has an apparent size of 60 x 10 arcminutes on the sky with an actual diameter of 14.2 ly.

How far is it?

Distance estimates for The Horsehead, Flame, and IC 434 Nebulae range from 1,260 to 1,600 ly.

How to find it?

The Horsehead is "easy" to find but very difficult to actually see (visually). Think of trying to see a black smudge on a black tablecloth. Although it is difficult to visually observe, it is relatively easy to image. To visually observe the Horsehead Nebula, a 10" or larger telescope, H-beta filter, and dark skies are required. 

The Horsehead is located about 1 degree south of the bright star Alnitak (the leftmost star in Orion's belt. Refer to the red rectangle in the finder chart below. 

Finder Chart for The Horsehead and Flame Nebula.

Imaging Notes:

Sunday February 8, 2026, was forecast to be clear, very cold, but clear. The first clear night in months. There was also this little event going called the Super Bowl. I could not stomach watching the Patriots, so I opted to brave the cold and head out to our club's observatory. I was joined by two other members. 

One member ran the club's Celestron 14" Edge HD. He initially pointed the scope at Jupiter. After grabbing some data on Jupiter, he captured data on M1 (The Crab Nebula). The other member and I attempted to get the club's Tele Vue NP101is setup running. We ran into an issue focusing the telescope. The dangerously cold temperatures (well below zero Fahrenheit) made it too difficult for the electronic focuser to move the telescope's focuser. We were able to manually focus with a Bahtinov mask but lost valuable imaging time due to the issue. We need to see what we can do to mitigate this from happening in the future, a good task for a cloudy night.

The skies were really good. Guiding was fantastic and the stars held steady with an HFR of 2.7. I had to leave at 9 pm (work night) but the other members imaged for about another hour before closing up shop. I went out Sunday February 15, 2026, with another member to collect matching darks and flats so we could process the image.

Processing:

All pre and post processing was performed in PixInsight. Pre-Processing: All subs were visually inspected with Blink. All light Frames, Flats, Darks and Dark flats were loaded into WBPP and pre-processed. Linear Post Processing: Background extraction was performed with GraXpert followed by BXT (correct only). SPCC was used for Color Calibration followed by a full application of BXT. The image was made non-linear with MultiscaleAdaptiveStretch (MAS) process. The Stars were then removed using StarXT. 

Non-linear Post Processing: Starless: Noise was reduced with NXT. The Image blend Script was used to sharpen the image with a High Pass Filter. DarkStructureEnhance script was used with a low setting to help make any dark structures pop a little more. A final Curves adjustment was made with CT to enhance contrast. Stars: No additional processing was performed on the stars. Final: The Stars and Starless images were combined with Pixel Math to produce the final image. 

Image Details:

Capture Date: 02/08/2026

Location: North Java, NY (Beaver Meadow Observatory)

Telescope: Tele Vue NP101is (no reducer)

Camera: ZWO ASI2600MC Pro 

Filter: N/A

Mount: ZWO AM5n

Exposure: 36 exposures @ 180 sec each for a total exposure of 1 hours and 48 minutes. All exposures were captured at Gain 100 / Offset 50 / -25°C each. 

Other: ZWO EAF, ZWO ASIair plus

Software: ASIair & PixInsight

Clear Skies!

Ernie

Experimenting at the Club's Observatory

 First off, it's been a while ... 

The last clear night that I was able to image was on October 3rd. So, apologies for taking so long between posts. The weather has been horrendous and travel for work forced me to miss the one clear night we had in November. I was super excited to see a clear forecast for Thursday night (December 14th). Our astronomy club has an imaging group, we're called the Tuesday Night Imagers. the leader of our group posted on the forum of our website that Tuesday would be Thursday this week. One advantage of winter is I can make it out to the observatory after work and get a few hours of imaging in and still get home at a reasonable time. 

We made our plans ahead of time. The plan was to try my personal camera, the ZWO ASI2600MC-Pro on the club's Celestron 14" Edge D Telescope. Our club has the 14" and a Tele Vue NP-101is mounted on an Astro Physics AP-1200 mount. We have an Atik 383L+ Color camera for the 14". A great camera, but it is an older CCD camera and is starting to show it's age. We are actively discussing what camera to get to replace it. We wish to stick with a One-Shot Color (OSC) camera for simplicity and convivence. Technically, my camera is a great match for the NP-101is but not for the 14". Even with the 0.7x focal reducer, the 14" has focal length of 2,738 mm. Therefore, my camera's small pixels result in a very over-sampled image scale with the 14". This is typically not desirable. However, we have seen some great results from similar setups and decided to give this a try. 

I got to the observatory around 5:30 pm. The observatory director, the leader of our imaging group, was unable to make it out to the observatory due to a last minute issue. Typically, the observatory director and another member of our group are the main operators of the telescope. The other telescope operator and I got the telescopes going. My camera on the 14" and the other telescope operator put his ZWO ASI1600MC-Pro on the NP-101. The observatory director and a couple of other members of our imaging group joined us via Zoom. 

The skies were not great. lots of high/thin clouds or haze especially towards the western horizon. Of course, that's exactly where we wanted to image. We wanted to get data on Comet 12/P Pons-Brooks which is near the bright star Vega. We tried for about an hour, but the data was not looking good. Autofocus was struggling and there was little signal from the comet. I have not tried to process the data from the 14" yet but the other telescope operator managed to get a nice image (especially considering the conditions). 

As it was also the peak of the Geminids meteor shower, we did try to get outside and see if we could see meteors. We saw about four or five. We also noticed skies were better towards the Southeast, where the constellation Orion was rising. We decided to give up on the comet and slew to the Horsehead Nebula (Barnard 33). We slewed to B33 and got both telescopes framed as best as we could. We were feeling the pressure to get imaging quickly, so we didn't rotate the camera or refine (manually) the relative pointing of the telescopes to one another, a disadvantage of two scopes on one mount. We dialed in our exposure settings, 120 sec subs at Gain 100 with an Offset of 50 for me and started collecting exposures. The results looked really good. The stars were nice and round. We imaged for little over an hour. It was a work night, skies weren't the best, and both of us had a pretty good drive home. This is the resulting image from the night's work. Pretty encouraging results!

The Horsehead Nebula (B33) from the BAA's Beaver Meadow Observatory on 12/14/2023.

Processing

There was a lot of conversation in our club's forum leading up to Thursday night and again afterwards regarding how to capture and process images with this scope/camera combination. We are lucky to have some talented imagers in the group, one in particular who is both very talented and technically knowledgeable. This person was a key participant in those discussions and I'm personally very grateful for his mentoring.

All pre and post processing was performed in PixInsight. Pre-processing: All 34 images were examined in Blink, 2 were rejected. The remaining 32 images were calibrated, registered, and stacked in WBPP with 1X Drizzle integration, astrometric solution, and auto-crop enabled. 

Linear Post-processing: Gradient was removed with the GraXpert script (AI mode), initial deconvolution with BlurXT in Correct Only mode, color calibration SPCC, second deconvolution with BlurXT, noise reduction NoiseXT, and the image was made non-linear with HT. Non-linear Post processing: Stars were removed with StarXT. Stars: Saturation curve applied with CT and green noise removed with SCNR. Starless: Multiple iterations of CT were applied to increase brightness and contrast, Saturation was added with CT, green noise was removed with SCNR, and noise reduction was further reduced with NoiseXT. The image was sharpened with LHE at 3 different kernel sizes and MMT. Dark structure was enhanced with the DSE script and stars were screened back in with Pixel Math. No down sampling was performed. 

What is it?

The Horsehead Nebula (Barnard 33) is a small dark nebula silhouetted against the emission nebula IC434. B33 resembles the profile of the head of a horse. It is a concentration of dust and non-luminous gas that blocks light of the nebula behind it. 

Annotated image of the Horsehead Nebula

How big is it?

This object has an angular distance of 6.0 x 4.0 arcminutes on the night sky. The object is 2.8 light-years (ly) across. 

How far is it?

It is located about 1,600 light-years (ly) from Earth in the Constellation of Orion.

How to find it?

It is located close to Alnitak, one of the 3 belt stars in Orion. This makes it easy to find. However, it is much easier to photograph than visually observe. To give you the best chance of success in visually observing it, use a large aperture telescope, use an H-beta nebula filter, and get to dark skies. It is tiny and it is essentially like trying to find a black fingerprint on a black tablecloth. Try to find the emission nebula IC 434 and look for the absence of the nebula. Photographically, this target shows up relatively easily and can be captured with and without the use of filters. 

Finder Chart for B33

Image Details:

Capture Date: 12/14/2023

Location: North Java, NY (BAA's Beaver Meadow Observatory

Telescope: Celestron 14" Edge HD w/0.7x Focal Reducer

Camera: ZWO ASI2600MC Pro

Filter: N/A

Mount: Astro Physics AP-1200

Exposure: 32 exposures at 120 sec / Gain 100 / Offset 50 / -10°C each for a total exposure of 1 hour and 4 minutes.

Software: NINA, PHD2, and PixInsight

Clear Skies!

Ernie