The Horsehead Nebula

The Horsehead Nebula (Barnard 33) is an iconic dark nebula in the constellation Orion. Along with the nearby Flame Nebula (NGC 2024), this region is one of my absolute favorite deep-sky targets to shoot with my astrophotography camera and telescope.  

Unlike many other dark nebulae in the night sky, this one is very easy to find. It is located near the most eastern star in Orion’s Belt, Alnitak. The Horsehead Nebula is part of the much larger Orion Molecular Cloud Complex

In the image below, you’ll see where the Horsehead Nebula sits in relation to the nearby Orion Nebula. The constellation Orion is home to some of the brightest and most fascinating deep-sky objects in the night sky.

Horsehead and Flame Nebula

The Horsehead Nebula (and Flame Nebula) sits above the Orion Nebula.


Active star formation is taking place in the dark cloud of gas and dust of the Horsehead Nebula. The distinctive red color that you see in photographs of the Horsehead Nebula region is due to the ionized hydrogen gas (Ha) sitting behind the dark nebula.

The nebulosity of the Horsehead is said to be energized by the bright star Sigma Orionis, the bright blueish O-type star you see in the upper right of my image. Although it appears as one bright star, it is actually a multiple system of five stars.

horsehead nebula

The Horsehead Nebula. Trevor Jones.

From the Northern Hemisphere, IC 434 is a winter deep-sky object that is best photographed between the months of November – February. In the Southern Hemisphere, it is an evening sky object in the summer sky. 

By late October,  you can start observing and photographing the Horsehead Nebula with your telescope in the early morning hours. I often start my astrophotography imaging projects of the winter targets in the fall, as the winter season is typically the cloudiest. 

From a light-polluted backyard in the city, capturing a nebula like the Horsehead Nebula requires patience and perseverance. The use of narrowband filters or a light pollution filter can dramatically improve your image results from a city sky.

The image shown above was captured with the help of a monochrome CMOS camera (ASI2600MM Pro) and LRGB filters. The dynamic nature and overall brightness of this object make it possible to photograph this nebula using almost any camera (see my results using a $250 DSLR camera). 

horsehead nebula in Orion

The Horsehead Nebula lies close to the bright star, Alnitak, in Orion’s Belt. 

The Horsehead Nebula

The Horsehead Nebula lives approximately 1,500 light-years away from Earth. This nebula gets its name from the shape of the dark cloud of dust in front of a vibrant red emission nebula (IC 434). It is one of the most photographed and identifiable nebulae in the night sky. 

The reflection nebula residing southwest of the Horsehead is cataloged as NGC 2023. There are even more fascinating deep sky objects in this region of space including IC 432, as seen in this annotated image.

Horsehead Nebula

My close-up photo of the Horsehead Nebula using data captured with a monochrome CCD camera.

Horsehead Nebula Details:

  • Constellation: Orion
  • Object Type: Dark Nebula
  • Dimensions: Approximately 3.5 x 2.5 Light Years
  • Cataloged: Barnard 33
  • Distance from Earth: 1,500 Light Years

Images of the Horsehead Nebula are everywhere, including the cover of famous astrophotography books, and all of my social media profile photos. It is truly an iconic image of space that illustrates the beauty and vastness of our universe.

The red glow in my image is due to the hydrogen gas lying behind the Horsehead Nebula, which has been ionized by the bright star Sigma Orionis. The streaky appearance of the hydrogen gas in the background glow is created by Magnetic fields. The intense glowing strip of hydrogen gas that the Horsehead crosses over is my favorite feature of this deep-sky object.

The darkness of the Horsehead Nebula’s figure is created by thick interstellar dust blocking the light of the gas and stars behind it. It is interesting to note that the lower portion of the Horsehead’s neck is casting a shadow to the left.

Horsehead Nebula Astrophotography Image by Trevor Jones

The Horsehead Nebula, Flame Nebula, and NGC 2023. Trevor Jones.


In the following video, I photograph the Horsehead Nebula in detail from my backyard observatory. This should give you a better idea of the process of capturing the Horsehead Nebula using a camera and telescope. 

Can You See it Visually Through a Telescope?

As with all of the deep-sky nebulae I photograph, don’t expect to see an image of the Horsehead Nebula like the one shared on this page through the eyepiece of your telescope. To view the Horsehead Nebula visually, I’ve read that a telescope with at least 10″ of aperture is needed, and with the help of an h-beta filter. 

I’ve personally never witnessed the Horsehead Nebula in real-time through a visual telescope. My primary visual telescope (8″ Dobsonian reflector) does not have enough light-gathering power to reveal the Horsehead, but the Flame Nebula is possible under the right conditions. 

For modest telescopes under 8″ in aperture, stick to the brighter nebulae in Orion such as the Messier 42 or Messier 78. To help you locate this object in the night sky, you may want to use a stargazing app on your mobile phone to steer you in the right direction. 

While it is a difficult visual target, astrophotography with a camera and telescope is where this deep-sky object really shines. Capturing long-exposure (tracked) images of 3 minutes or more can really pull out the true beauty of this target.


There are very few targets I’ve pointed my camera and telescope toward more than the Horsehead Nebula (the Orion Nebula holds this title). Each time I photograph it, the image gets a little better.

Through astrophotography, we can appreciate the delicate details of the Horsehead Nebula and the surrounding area, by collecting numerous long-exposure images. 

Below, is an image of the astrophotography telescope used (Radian 75 APO) for my latest image of the Horsehead and Flame nebulae. It is a quintuplet refractor telescope with a focal length of 400mm at F/5.9.

best astrophotography telescope

A wide-field apochromatic (APO) refractor telescope is a great way to capture the Horsehead Nebula and the surrounding area. Due to the wide field of view of this system, I was able to frame the image to include the nearby Flame Nebula. This is a popular orientation for images of the Horsehead Nebula in Orion.

For a complete list of recommended telescopes (that I have used personally), please see my round-up of some of the best astrophotography telescopes available in 2022. The Radian 75 APO shown above is included on this list. 

horsehead nebula

Photo Details:

Integration (9.5 Hours)

  • 35 x 180-seconds Lum
  • 35 x 180-seconds Red
  • 35 x 180-seconds Green
  • 35 x 180-seconds Blue
  • 30 x 300-seconds H-Alpha


The images were registered and calibrated (using dark frames,flat frames, and bias frames) in DeepSkyStacker. The final image was processed in Adobe Photoshop and PixInsight using methods described in my image processing guide

Because this area contains a lot of hydrogen gas, a narrowband h-alpha filter is an effective choice for collecting important details of this subject. This isolates very specific areas of light emitted from the area surrounding the Horsehead Nebula and Flame Nebula.

Related Article: Narrowband Imaging Basics

Using a Camera Lens

I’ve photographed this nebula using a variety of camera lenses over the years, including an affordable Canon EF 50mm F1/.8. The image below was captured using a very modest astrophotography setup that included a Sky-Watcher Star Adventurer tracking mount. 

The details of this imaging session are outlined in the video “Nebula photography with a cheap DSLR camera and lens“. 

camera lens example

Results using a DSLR camera and 135mm camera lens (cropped).

The image above should give you a good example of the image scale you can expect when using a crop-sensor DSLR camera with a mid-range telephoto lens such as the Rokinon 135mm F/2.

The entire imaging kit used for this project is rather affordable and portable. Darker skies will help produce better images using this configuration.

budget astrophotography setup

Narrowband H-Alpha

Photos captured using a narrowband Hydrogen Alpha filter ignore almost all wavelengths of artificial light and produce a detailed monochrome portrait of the area. The filter I use with my Canon Rebel T3i is an Astronomik 12nm Ha clip-in filter.

A filter like this is a great way to add impressive narrowband details to your existing color photos and even shoot during a full moon. You can use a filter like this with a telescope, or with a camera lens such as the Rokinon 135mm F/2

The Astronomik 12nm Ha Filter (Canon EOS Clip-In Version)

I absolutely love the way this filter isolates hydrogen gas in emission nebula targets. It also captures very small, sharp stars in a way that a broadband filter never could. As I mentioned earlier, clip-in filters like this can be used with a camera lens as well.

To create the image below, I captured several 4-minute exposures totaling 1 hour and 20 minutes of overall exposure time. 

Horsehead Nebula in Ha

The Horsehead Nebula (and Flame Nebula) captured in Narrowband Ha (Canon DSLR)

After stacking the Ha exposures in DeepSkyStacker, I combined the final version with the RGB data to create a HaRGB Composite. This method can produce incredible portraits of deep-sky nebulae like the Horsehead Nebula, even from bright skies in the city.

I have also photographed this object using a monochrome CCD camera (Starlight Xpress SX-42) and a larger refractor telescope (Sky-Watcher Esprit 150). 

The image scale of this system creates an up-close view of the Horsehead Nebula at high magnification. The Horsehead Nebula is isolated from the nearby Flame Nebula for an unforgettable view.

The Horsehead Nebula captured in H-Alpha (Monochrome CCD)

Adding H-Alpha to the image

The addition of isolated H-alpha data can help boost the overall impact of your image.  using the Astronomik 12nm Clip-in filter on my Canon T3i helped immensely. This filter helps to create more contrast between the nebulosity and the background sky.

Using a ha filter on your DSLR adds a new dimension to your existing RGB (regular color) images.  Here are a few of the benefits of combining Ha with existing RGB images:

  • Improved contrast and detail in nebulosity
  • Cuts through heavy light pollution
  • Smaller, sharper stars

RGB and HaRGB Comparison

View the current list of astrophotography equipment used to capture this image. For the latest images and information, follow AstroBackyard on Facebook.