NGC 7293 - The Helix Nebula | Astrophotography and Tips
- Antoine & Dalia Grelin
- 4 days ago
- 7 min read
The Helix Nebula, designated NGC 7293, is commonly referred to as the Eye of God or even the Eye of Sauron, and looks like a larger and brighter version of M57, the Ring Nebula. This unique and interesting nebula is located in the constellation of Aquarius and is about 650 million light-years away.
This planetary nebula is a very popular target for beginner astrophotographers, not only because it has cool nicknames but also because it is very easy to capture.
Object Designation:Â NGC 7293, Caldwell 63
Other Names: The Helix Nebula
Constellation: Aquarius
Object Type:Â Planetary Nebula
Distance: 650 light-years away
Magnitude: 7.6
Discovery: Karl Ludwig Harding before 1824
In the northern hemisphere, the nebula is best visible around June and August. This means the best time to photograph NGC7293 is in the Summer season.
Below you can find all our attempts at the nebula taken with different types of cameras, so that you can compare results easily.
The Helix Nebula Astrophotography with the RASA 8
September 2024
This shot was captured using our RASA8 telescope and ASI2600MC camera from New Mexico. The Bortle 1 sky, sensitive camera and the fast telescope made this an easy target to shoot even without the use of filters.
I spent a total of 17.5 hours on this, which could (and should) have been longer, but the object was getting way too low in the sky so I had to cut it short! I was originally aiming for 40-50 hours like I do on most targets.
Click the image to see it in full resolution!
GEAR USED:
Camera: ZWO ASI2600MC Â
Telescope: Celestron RASA 8Â
Mount:Â 10Micron GM2000 HPS
Accessories: Celestron Focuser / PrimaLuceLab Eagle 5SÂ
Processing:Â Pixinsight, with R-C Astro plugins. Final touches in Skylum Luminar Neo
ACQUISITION DETAILS:
Total Exposure Time:Â 17.5 hours
Exposure Time per frame:Â 600 seconds
Filters: N/A
Gain:Â 100
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Imaging the Helix Nebula with a Cooled Monochrome Camera
October 31st, 2019
Two years after our first attempt with a DSLR, we went back to that same stargazing location in the desert with the same telescope and mount but with a different camera!
NGC 7293 was even lower in the horizon than the last time, so we only had time to collect about an hour and 30 minutes of total exposure. This is also the first time we decided to do bi-color imaging, using only Hydrogen Alpha and Oxygen III filters. The final result turned out gorgeous. There was so much more detail than we have ever seen, but you can see for yourself below! It blows our minds that the stars in the DSLR image are so bloated compared to the ones in this retake, knowing we followed the exact same processing workflow for both. This also might be because we were imaging in RGB rather than Narrowband.
GEAR USED:
Camera:Â ZWO ASI 1600mm Pro Mono
Telescope:Â Orion 8" Astrograph f/3.9
Mount: Atlas EQ-G
Guiding:Â ZWO ASI 290MM Mini
Acquisition: ZWO ASIAIR
Processing:Â Pixinsight
ACQUISITION DETAILS:
Total Exposure Time:Â 1 hour and 30 minutes
Exposure Time per frame:Â 3 minutes
Filters:Â Ha (45 minutes) / OIII (45 minutes)
Gain:Â 75
Imaging the Helix Nebula with a DSLR Camera
October 21st, 2017
We went to our usual stargazing location in the desert from 6 PM to 12 AM. We contacted members of the Las Vegas Astronomical Society asking if they'd like to join us for a night of imaging, and a few of them came with their telescopes! It was fun and it felt nice having company for once.
We decided to photograph the Helix Nebula knowing it would become too low on the horizon for the rest of the year very soon. Even though it was already low, we spent about 2 hours and 45 minutes on it until it completely disappeared behind Laughlin's light pollution dome, which was quite visible in the distance.
We spent the rest of our time photographing IC 5146 (The Cocoon Nebula) and the star cluster M37. We only spent one hour on each but we were pretty happy with the outcome of Messier 37. The Cocoon Nebula, however, we would like to revisit.
GEAR USED:
Camera: Canon 7D Mark II
Telescope: Orion 8" Astrograph f/3.9
Mount: Atlas EQ-G
Processing: Pixinsight
ACQUISITION DETAILS:
Total Exposure Time: 2.7 hours
Exposure Time per frame: 3 minutes
54 lights - 15Â Darks - 15Â Bias
ISO: 800
DSLR Astrophotography:
Spending about two hours on this target will give you the beautiful, colorful nebula as seen in the image on the left.
Note that ours is affected by a little bit of light pollution from a nearby city, so you might be able to get a cleaner image than this one with the same exposure time!
Monochrome Astrophotography:
Using a cooled monochrome astrophotography camera, the narrowband filters helped reveal the faint outer gas as you can see in our image to your right.
We wish we could have spent more time on it to gather more data but this is all we could get! It is still beautiful though and we can always add more to it next year. We always make sure to keep our raw files in a folder in case we want to stack more over time!
NASA Astrophotography:
Adding several more hours will allow you to capture the fainter, outer gases being expelled. The picture on the left is from the Hubble Space Telescope.
Although our DSLR version doesn't do it justice, know that it is really easy to photograph this target and have it look very close to Hubble's version even with a cheap camera.
Locating the Helix Nebula
The Helix nebula can be found in the Aquarius constellation, in an area devoid of bright stars.
Even though the Helix is the brightest planetary nebula in the night sky, it is not that easy to observe.
Because of its size, the nebula has a low surface brightness, making it difficult to spot through a large telescope. The key is to use binoculars or a low-power telescope so that the light from the Helix can be concentrated in one obvious spot in the wide visible sky.
NGC 7293 can also be seen with the unaided eye, as long as your vision is excellent and no light pollution is present from your observing site.
Keep in mind that from any place in the United States, the Eye of God does not rise very high in the sky, and disappears after a few weeks. Make sure to capture it before it is gone or you will have no choice but to wait an entire year to meet it again.
Cool Facts about the Helix Nebula
The first planetary nebula discovered to have cometary knots (about 20,000)
Expands at a rate of 40km/s
About half the size of the full moon
Download Raw Data: Use our raw data files to practice processing.
Single Shot & Processing of the Helix Nebula - DSLR Camera
We had the chance to take a few shots of the Helix from our usual imaging spot (Bortle 3.5) but also from a Bortle 1 zone near Tonopah, Nevada! As you can see below, the difference is very impressive! Sadly, our laptop literally broke during our Tonopah night and we were unable to image the Helix Nebula from there, so all the stacked images are from the Bortle 3.5 zone.
When it comes to the processing of NGC 7293, we had a little bit of trouble with the noise reduction because although we imaged from a pretty good Bortle zone, the Helix was low in the horizon and we had to shoot through Laughlin's (city not far from Las Vegas) light pollution dome.
We would really like to add more data to this next year and make sure it is higher in the sky when imaging.
Single Shot & Processing of the Helix Nebula - Cooled Camera
Processing the nebula was a true challenge for us this time because it was our first attempt at Bi-Color imaging! We had no idea how to combine two filters into three channels and we spent a long morning trying to figure it out. Thankfully, the internet is a wonderful place full of great tutorials and we were able to successfully stack our files using PixelMath on PixInsight.
Below you can see the 45-minute stacked images for both narrowband filters used: Ha and OIII. As you can see, they both look very different! The Hydrogen Alpha filter reveals all the outer gases, while the OIII filter only shows what's within the nebula. It's pretty fascinating.
Helix Nebula FAQ
In which constellation is the NGC 7293 nebula located?
You can find the Helix nebula in the constellation Aquarius.
How big is NGC 7293?
The Helix Nebula has a diameter of 2.5 light-years, and it appears as about half the size of the moon in our sky.
How far is NGC 7293?
The Helix Nebula is located approximately 650 light-years away from Earth.
How long should my exposure time be when photographing the Helix nebula?
I did 10-minute exposures at f/2, but 300 seconds would have also worked, and so would have 30 minutes I think! The core isn't that bright so the risks of getting an overblown center is low. I would say 10 minutes is a good all-around exposure time for most setups.
Should I use a filter to image the Helix Nebula?
You do not need filters to image this target, although you can shoot it in bicolor (HA + OIII) to get the best results. If you have a good dark site and a recent OSC camera, shooting without filters like our 2024 version is fine! You can add some HA on top of that if you wish, so that you can get all the sweet gas expelling around the nebula much easier.
Final Thoughts
The Helix Nebula is a very popular target among beginner astrophotographers. With great astrophotography equipment and the right conditions, you can get beautiful results. Don't worry if you didn't manage to get the image you wanted, you can take a page out of our book and try it again at a later time! The difference in skill and gear over two years is humbling.
We recommend you give this one a try before attempting M57, the Ring Nebula, as this target will be a larger and easier version.
Make sure to capture it as soon as it gets dark and when it is as high as possible in the sky because NGC 7293 does not rise much in most locations!
Clear Skies,
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