A Beginner's Guide to Researching & Finding Deep-Sky Targets
From Stargazer to Astrophotographer
Gear, tools, planning, and a curated list of 10 beginner-friendly deep-sky objects
Introduction
There's something magical about pointing your camera at the night sky and capturing light that has travelled millions of years to reach you.
I remember the first time I saw the Andromeda Galaxy appear on my camera screen. It was tiny, fuzzy, and nothing like the glossy images you see online — but I was hooked. That faint smudge of light was a galaxy of a trillion stars, and I had captured it.
But getting to that moment wasn't easy. When I first started researching astrophotography, I felt completely overwhelmed. Thousands of deep-sky objects. Confusing catalogue numbers. Equipment I didn't understand. Where do you even start?
This guide is exactly what I wish I'd had back then. I'll walk you through everything you need to know to find your first deep-sky targets — from understanding your gear to planning a night of imaging. No jargon, no fluff, just a clear, practical system you can follow.
Part 1: Know Your Gear — The "What Can I Actually Shoot?" Reality Check
The most common mistake beginners make is trying to shoot targets that are simply too small or too faint for their equipment. Before you can choose a target, you need to understand what your gear can actually handle.
Focal length is the biggest factor. It determines how much of the sky you can fit in your frame. Think of it like a zoom lens — wide-angle shows a big chunk of sky, telephoto shows a tiny slice but with more detail.
Gear-to-Target Quick Guide
- Wide-angle (14–35mm): Milky Way, constellations, star trails, aurora
- Short telephoto (50–135mm): Large nebulae (like Orion), Andromeda Galaxy, open clusters
- Medium telephoto (200–400mm): Galaxies, planetary nebulae, smaller nebulae
- Long focal length (500mm+): Small galaxies, planetary details, small nebulae
Aperture is the next thing to consider. A faster lens (f/2.8 or wider) lets in more light, meaning shorter exposures and less noise. Think of it like a bucket catching rain — a wider bucket catches more water in the same amount of time. For deep-sky work, you want the widest aperture you can get.
The mount or star tracker determines how long you can expose before the stars start to trail. A good tracker will allow exposures of 1–2 minutes or more. Without one, you're limited to about 15–30 seconds before stars become blurry.
My honest advice: Start with a wide-angle or short telephoto lens and a basic star tracker. A fast prime lens and a simple intervalometer will get you started. You don't need a telescope or expensive mount to capture incredible images of large nebulae and galaxies.
Part 2: The "Big Three" Factors for Target Selection
Once you know what your gear can handle, you need to evaluate potential targets. I use three simple criteria to decide if an object is worth shooting.
1. Brightness (Magnitude)
Magnitude is how astronomers measure the brightness of objects in the sky. The lower the number, the brighter the object. A magnitude 1 star is very bright. A magnitude 8 object is much fainter.
For beginners, I recommend aiming for objects with a magnitude of 8 or brighter. Anything fainter than that becomes very difficult to find and capture without long exposures and dark skies.
2. Size (Angular Diameter)
How big is the object in the sky? This is measured in arcminutes or arcseconds. A full moon is about 30 arcminutes across. The Andromeda Galaxy is about 190 arcminutes — huge!
For beginners, look for objects that are at least 15–20 arcminutes in size. Anything smaller will be very difficult to frame and capture detail.
3. Altitude (Where is it in the sky?)
Altitude is how high the object is above the horizon. The higher it is, the less atmosphere your light has to travel through. Aim for targets that reach at least 30–40° above the horizon. Avoid anything too close to the horizon — you'll be shooting through thick, turbulent air, and the results will be blurry.
Example: If I want to shoot M31 (Andromeda) in September, I check when it's at its highest point in the sky. In the northern hemisphere, it's best in autumn, high overhead. Perfect.
Part 3: The Research Toolkit — Tools to Find Your Targets
You don't need to memorise the night sky. There are some brilliant (and free!) tools that will do all the heavy lifting for you.
Planetarium Software
Stellarium (free, desktop) is the single most useful tool for astrophotography planning. It's a realistic 3D simulation of the night sky — you can see exactly where objects will be on any date and time. You can even type in an object name and it will show you where to look.
SkySafari (mobile) is my go-to for field use. I can point my phone at the sky and it tells me what I'm looking at — incredibly useful for finding targets in the dark.
Websites & Databases
Telescopius is the most important site for target research. You can browse objects by type, brightness, and season. The "Targets" feature lets you filter by your gear and see what's visible tonight — absolute gold for planning sessions.
Deep Sky Watch has excellent beginner-friendly lists with detailed information on hundreds of objects.
Messier and Caldwell catalogues are the classic starting points for deep-sky objects. Messier objects (M1–M110) are some of the brightest and most famous. Caldwell objects (C1–C109) are also great beginner targets. Start with Messier — they're the most beginner-friendly.
Weather & Moon Planning
Clear Outside and AstroSpheric are essential for checking astronomical weather conditions — cloud cover, transparency, and seeing.
Moon phase matters more than you think. A full moon will wash out all but the brightest deep-sky objects. Plan your deep-sky imaging around the new moon when the sky is darkest. I check a moon phase calendar before I even think about packing my gear.
Part 4: The Beginner's Hit List — 10 Targets to Start With
Here are 10 of the best beginner-friendly deep-sky objects. These are bright, relatively large, and visible in the northern hemisphere at various times of the year.
10 Beginner-Friendly Targets
| Object | Type | Constellation | Magnitude | Season | Focal Length |
|---|---|---|---|---|---|
| M31 — Andromeda Galaxy | Galaxy | Andromeda | 3.4 | Autumn | 50–200mm |
| M42 — Orion Nebula | Nebula | Orion | 4.0 | Winter | 50–200mm |
| M45 — Pleiades | Open Cluster | Taurus | 1.2 | Winter | 50–135mm |
| M13 — Hercules Globular Cluster | Globular Cluster | Hercules | 5.8 | Summer | 200–400mm |
| M27 — Dumbbell Nebula | Planetary Nebula | Vulpecula | 7.5 | Summer | 200–400mm |
| M57 — Ring Nebula | Planetary Nebula | Lyra | 8.8 | Summer | 400–600mm |
| M33 — Triangulum Galaxy | Galaxy | Triangulum | 5.7 | Autumn | 50–200mm |
| M51 — Whirlpool Galaxy | Galaxy | Canes Venatici | 8.4 | Spring | 200–400mm |
| NGC 7000 — North America Nebula | Nebula | Cygnus | 4.0 | Summer | 50–135mm |
| M44 — Beehive Cluster | Open Cluster | Cancer | 3.1 | Spring | 50–135mm |
Pro tip: Start with M31, M42, or M45 — they're bright, large, and easy to find. You'll get a great result on your first try.
Part 5: The "Pre-Flight" Checklist
Before you head out, run through this quick checklist. It'll save you from the frustration of realising you've forgotten something crucial.
Pre-Shoot Planning
- Check the weather forecast — not just cloud cover, but transparency and seeing
- Check the moon phase — new moon is best; avoid full moon
- Confirm target visibility — altitude, timing, and season
- Plan your framing — use Telescopius FOV simulator to visualise the shot
- Prepare your gear checklist — camera, lens, tripod, intervalometer, batteries, memory cards, warm clothes
- Set realistic expectations — you won't get Hubble images on your first night, and that's okay!
Part 6: Common Beginner Mistakes
I've made every single one of these mistakes. Learn from my pain.
- Choosing targets that are too faint. Stick to magnitude 8 or brighter for your first attempts. Trust me.
- Shooting through light pollution without filters. If you're near a city, consider a light pollution filter.
- Forgetting about the moon. A full moon will ruin your deep-sky session. Plan around the new moon.
- Setting unrealistic expectations. Your first image won't look like Hubble's. It'll be fuzzy, noisy, and you'll be incredibly proud of it anyway.
- Not checking the target's altitude. Shooting near the horizon is a waste of time. Aim for targets above 30–40°.
- Spending too much time on one target. You'll be tempted to keep shooting one object, but more data doesn't always mean a better image. Learn when to move on.
Quick-Reference Card
Print this out and keep it in your camera bag. It's everything you need to remember when you're out in the dark.
📋 Astrophotography Quick-Reference Card
Recommended Gear Fast lens (f/2.8 or wider) Star tracker or mount Intervalometer Sturdy tripod
Moon Phase Cheat Sheet 🌑 New Moon — Best for deep-sky 🌙 Crescent — Good for deep-sky 🌓 Quarter — Okay, but moon will be bright 🌕 Full Moon — Avoid deep-sky; shoot the moon!
A Note on Ethics
As you venture out into dark skies, please remember to leave no trace. Dark sky sites are fragile and increasingly rare. Don't leave rubbish behind. Keep noise to a minimum. Respect any signs or access restrictions. If you're photographing in a National Park or reserve, follow their guidelines.
These places are special — treat them with the respect they deserve.
Conclusion
Finding your first deep-sky target might feel overwhelming, but it doesn't have to be. Start with a bright, large object like M31 or M42. Use the tools I've shared to plan your session. Run through the pre-flight checklist. And most importantly — be patient with yourself.
Every great astrophotographer started exactly where you are now. They made mistakes. They struggled to find targets. They spent cold nights wondering why their images didn't match what they saw online. But they kept going. And so will you.
When you capture that first image — that faint smudge of light that turns out to be a galaxy of a trillion stars — you'll understand why it's all worth it.
I'd love to see your first image. Share it in the comments below, or tag me on Instagram. And if you have any questions, ask away — I'm always happy to help.
Clear skies, everyone. 🌌
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