r/Astronomy • • Mar 27 '20

Mod Post Read the rules sub before posting!

900 Upvotes

Hi all,

Friendly mod warning here. In r/Astronomy, somewhere around 70% of posts get removed. Yeah. That's a lot. All because people haven't bothered reading the rules or bothering to understand what words mean. So here, we're going to dive into them a bit further.

The most commonly violated rules are as follows:

Pictures

Our rule regarding pictures has three parts. If your post has been removed for violating our rules regarding pictures, we recommend considering the following, in the following order:

  1. All pictures/videos must be original content.

If you took the picture or did substantial processing of publicly available data, this counts. If not, it's going to be removed.

2) You must have the acquisition/processing information.

This needs to be somewhere easy for the mods to verify. This means it can either be in the post body or a top level comment. Responses to someone else's comment, in your link to your Instagram page, etc... do not count.

3) Images must be exceptional quality.

There are certain things that will immediately disqualify an image:

  • Poor or inconsistent focus
  • Chromatic aberration
  • Field rotation
  • Low signal-to-noise ratio
  • Images that don't fill the frame because you were shooting through an eyepiece

However, beyond that, we cannot give further clarification on what will or will not meet this criteria for several reasons:

  1. Technology is rapidly changing
  2. Our standards are based on what has been submitted recently (e.g, if we're getting a ton of moon pictures because it's a supermoon, the standards go up to prevent the sub from being spammed)
  3. Listing the criteria encourages people to try to game the system

So yes, this portion is inherently subjective and, at the end of the day, the mods are the ones that decide and the mods are under no obligation to explain this decision to you.

If you are informed that your post was removed because of image quality, arguing about the quality will not be successful. In particular, there are a few arguments that are false or otherwise trite which we simply won't tolerate. These include:

"You let that image that I think isn't as good stay up"

  • See above about how the standards are fluid.

"Pictures have to be NASA quality"

  • They don't.

"You have to have thousands of dollars of equipment"

  • You don't. Technique matters.

"This is a really good photo given my equipment"

  • The standard is "exceptional". Not "exceptional for my equipment".

"This isn't being friendly to beginner astrophotographers"

  • Correct. To keep the sub from being spammed by low quality and low effort posts, this sub has standards.

"My post was getting a lot of upvotes"

  • Upvotes are not an "I get to break the rules" card.

Using the above arguments will not wow mods into suddenly approving your image. It will result in a ban.

Trying to argue with the mods using bad arguments isn't going to fly.

Lastly, it should be noted that we do allow astro-art in this sub. Obviously, it won't have acquisition information, but the content must still be original and mods get the final say on whether on the quality (although we're generally fairly generous on this).

Questions

This rule basically means you need to do your own research before posting.

  • If we look at a post and immediately have to question whether or not you did a Google search, your post will get removed.
  • If you asked Chat GPT or any other LLM, your post will be removed (see our rule regarding sources).
  • If your post is asking for generic or basic information, your post will get removed.
  • If your post is using basic terms incorrectly because you haven't bothered to understand what the words you're using mean, your post will get removed.
  • If you're asking a question based on a basic misunderstanding of the science, your post will get removed.
  • If you're asking a complicated question with a specific answer but didn't give the necessary information to be able to answer the question because you haven't even figured out what the parameters necessary to approach the question are, your post will get removed.

To prevent your post from being removed, tell us specifically what you've tried. Just saying "I GoOgLeD iT" doesn't cut it.

  • What search terms did you use?
  • In what way do the results of your search fail to answer your question?
  • What did you understand from what you found and need further clarification on that you were unable to find?

Furthermore, when telling us what you've tried, we will be very unimpressed if you use sources that are prohibited under our source rule (social media memes, YouTube, AI, etc...).

As with the rules regarding pictures, the mods are the arbiters of how difficult questions are to answer. If you're not happy about that and want to complain that another question was allowed to stand, then we will invite you to post elsewhere with an immediate and permanent ban.

Object ID

We'd estimate that only 1-2% of all posts asking for help identifying an object actually follow our rules. Resources are available in the rule relating to this. If you haven't consulted the flow-chart and used the resources in the stickied comment, your post is getting removed. Seriously. Use Stellarium. It's free. It will very quickly tell you if that shiny thing is a planet which is probably the most common answer. The second most common answer is "Starlink". That's 95% of the ID posts right there that didn't need to be a post.

Do note that many of the phone apps in which you point your phone to the sky and it shows you what you are looing at are extremely poor at accurately determining where you're pointing. Furthermore, the scale is rarely correct. As such, this method is not considered a sufficient attempt at understanding on your part and you will need to apply some spatial reasoning to your attempt.

Pseudoscience

The mod team of r/astronomy has several mods with degrees in the field. We're very familiar with what is and is not pseudoscience in the field. And we take a hard line against pseudoscience. Promoting it is an immediate ban. Furthermore, we do not allow the entertaining of pseudoscience by trying to figure out how to "debate" it (even if you're trying to take the pro-science side). Trying to debate pseudoscience legitimizes it. As such, posts that entertain pseudoscience in any manner will be removed.

Outlandish Hypotheticals

This is a subset of the rule regarding pseudoscience and doesn't come up all that often, but when it does, it usually takes the form of "X does not work according to physics. How can I make it work?" or "If I ignore part of physics, how does physics work?"

Sometimes the first part of this isn't explicitly stated or even understood (in which case, see our rule regarding poorly researched posts) by the poster, but such questions are inherently nonsensical and will be removed.

Sources

ChatGPT and other LLMs are not reliable sources of information. Any use of them will be removed. This includes asking if they are correct or not.

Content

Due to the profusion of AI slop apps, we're no longer allowing apps at all. No, we don't care if you're wanting a "review". No we don't care if they're free. No we don't care if you put it in a website.

Bans

We almost never ban anyone for a first offense unless your post history makes it clear you're a spammer, troll, crackpot, etc... Rather, mods have tools in which to apply removal reasons which will send a message to the user letting them know which rule was violated. Because these rules, and in turn the messages, can cover a range of issues, you may need to actually consider which part of the rule your post violated. The mods are not here to read to you.

If you don't, and continue breaking the rules, we'll often respond with a temporary ban.

In many cases, we're happy to remove bans if you message the mods politely acknowledging the violation. But that almost never happens. Which brings us to the last thing we want to discuss.

Behavior

We've had a lot of people breaking rules and then getting rude when their posts are removed or they get bans (even temporary). That's a violation of our rules regarding behavior and is a quick way to get permabanned. To be clear: Breaking this rule anywhere on the sub will be a violation of the rules and dealt with accordingly, but breaking this rule when in full view of the mods by doing it in the mod-mail will 100% get you caught. So just don't do it.

Claiming the mods are "power tripping" or other insults when you violated the rules isn't going to help your case. It will get your muted for the maximum duration allowable and reported to the Reddit admins.

And no, your mis-interpretations of the rules, or saying it "was generating discussion" aren't going to help either.

While these are the most commonly violated rules, they are not the only rules. So make sure you read all of the rules.


r/Astronomy • • 4h ago

Astrophotography (OC) Total Solar Eclipse, Aug 12, 2026 from Valladolid, Spain - my experience

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109 Upvotes

Hi. Would like to share my own experience of Aug 12, 2026 Total Solar Eclipse from Spain. 

This was my first total solar eclipse. Maximum phase, which I have seen before, was abt 90% in 1999. I had set my sights on this specific eclipse years ago and had long planned to make the trip, especially since no total solar eclipses are expected in my home country Ukraine in the coming decades.

Unlike the 2027 eclipse, the choice of location for the 2026 event was straightforward: aside from Spain, the chances of seeing it elsewhere were slim to none. The first and most crucial step was selecting an observation place, a detailed climate analysis along the eclipse path (https://eclipsophile.com/tse2026/) proved to be very useful here. Although the eclipse path crosses numerous Spanish cities, the range of viable options wasn't actually that broad. I ruled out the north due to its high humidity and cloudy weather, the Mediterranean coast also seemed too risky, given sea influence. Consequently, my list quickly narrowed down to the northern Meseta region (Burgos, Valladolid, León), which is the driest area and keeps the lowest statistical probability of cloud cover in August.

Initially, the plan was to stay overnight in the town where I planned to watch the eclipse, but accommodation prices were astronomical due to limited proposal and huge demand. Ultimately this issue was solved by staying in Madrid, which offers a vast number of hotels and has no prob with avails. Given this, Valladolid was finally chosen as logistically optimal. Although this meant sacrificing about 15 seconds of the eclipse's totality, it was an just hour away only by train, and I was back to Madrid by 11 PM.

Since the eclipse was taking place at sunset, a clear view of the western horizon was essential - a challenging requirement in a city I had never visited before. I started with google maps to search for high ground: hills, parks, or open fields on the western side of the city, virtually scouting the area and marking potential spots. Furthermore, www.peakfinder.com allowed to check the terrain, the elevation of the horizon, and the precise sunset time for each specific location.

Fortunately, the weather forecast was favorable. I arrived in Valladolid at noon and headed straight to the outskirts to check out the spots I had marked. The observation site turned out to be a sort of wild, remote park. Amidst the 35-degree heat, there were very few people around, and it quickly became clear that the few who were there had come for the exact same reason. On the way, I encountered an elderly man with a tent already setting up his equipment, and I passed a few other people who asked, "Eclipse, yeah?" After walking around a bit with a compass app on my phone (which was crucial, as many people didn't realize their view toward the sunset would be quite restricted) I found a good spot. I also scouted the area and noted a few other potential locations nearby, just in case mine was already taken.

The partial eclipse was set to begin around 7:30 PM, so there wasn't much point in hanging there all day. I headed back to the city center to walk around, planning to return abt 6:00 PM. The absence of a large number of people during the day ultimately proved deceptive. By evening, the approaches to the park were packed with a huge crowd, people spontaneously swarmed the slopes of the massive hill. Luckily, I managed to find a decent spot, though area around was packing increasingly, as the eclipse drew near.

I’m not a professional photographer and I didn’t want my first experience to be spent entirely fiddling with gear. Still, I wanted to keep something except memories, so I brought my Seestar S50 and set it to record a timelapse, which was an ideal solution that required quite little attention. Things didn't go exactly as planned :), but overall, I’m happy with the result.

Visually, it was an incredible experience. Even though the Sun shone quite brightly right up to the last moment, making it hard to spot the narrowing crescent, the changing daylight made the event unmistakable. It brought back memories of that strange twilight I recall from 1999, as if someone had simply turned down the brightness outside. It is difficult to put into words the experience of an eclipse near totality, no youtube video can truly capture the scale of the "black sun" effect surrounded by its corona. As an extra bonus, since the eclipse was near sunset, the final phase could be observed with the naked eye, without glasses. If that is possible, I would highly recommend to witness a total solar eclipse for every amateur astronomer at least once in their life.

A few takeaways for the future:

  1. I would advise anyone planning to see totality to have a Plan B, C, and so on, just in case circumstances change. Weather is the primary concern, but there are plenty of other potential complications, such as train cancellations or strikes, etc. I had considered alternative options in other cities beforehand, just in case I needed to change plans at the last minute. Fortunately, I didn't have to use them, however, even though it was August and Valladolid has a very hot climate, it was rainy there just a couple of days after the eclipse, so you never really know for sure.
  2. Practice. You really should take the time to practice beforehand and keep a clear plan in mind for what to do during the eclipse. Set timers or alarms for specific times, there’s even an app that tells you exactly when to put on your glasses or remove the filter, though that’s more for professional photography. Despite my preparation, I still managed to miss the shots of the "diamond ring" and Baily's beads, but without practice, the outcome could have been truly bad.
  3. Food and drink. The eclipse lasts 2–3 hours from start to finish, plus the time spent on-site before and after, and it’ll be too late to go anywhere else once it begins. Personally, I underestimated how much water I’d need given the heat, though fortunately, there were plenty of people nearby to ask.

And most importantly, of course: don't stress and just enjoy the event.

On a fun note, I managed to capture three airplanes in the background.

Photos are extracts from Seestar S50 timelapse via PIPP.


r/Astronomy • • 12h ago

Astrophotography (OC) M45 - Pleiades.

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423 Upvotes

In 2024 i took my first photo of a DSO - Pleiades.

It inspired me to pursue this hobby.

Now in 2026 i acquired a mount - the MSM Nomad.

So it was about time to shoot it again,this time with 2 years of experience behind me.

I was only able to acquire about 1hr and 40 minutes of data,due to the cloudy weather, but even then the result is still pretty good.

OM System OM-1 & Tair 11-a 135mm f2.8 mounted on MSM Nomad.

100 x 60s. Stacked in APP, Processed in Siril and Lightroom.

Bortle 4.


r/Astronomy • • 3h ago

Astrophotography (OC) Supernova SN2026aaiv in NGC7331

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74 Upvotes

My newest capture of supernova SN2026aaiv near the core of the unbarred spiral galaxy NGC 7331 (Caldwell 30) just past peak flux (peaked at 12.2mag)

This galaxy sits 43.79 million light years away in the constellation Pegasus, meaning this supernova happened when our earliest mammalian ancestors were first roaming the planet. It is a Type 1a supernova meaning its progenitors were a white dwarf and a second companion star that violently merge and eviscerate themselves without leaving any remnant. This supernova is notable as it is the second bright supernova to come out of NGC7331 in the last year which is a decently rare occurrence for a single “nearby” galaxy.

Capture information:

234 x 30s subs

1600ISO

Sony a7iv

3250mm 16 inch f/8 Meade RCX 400 UHTC

Bortle 2 skies

Processed in SIRIL and Graxpert, and finished in Photoshop


r/Astronomy • • 1h ago

Question (Describe all previous attempts to learn / understand) What is that in the moon?

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• Upvotes

Tried to search it on the internet idk what it is maybe it’s just the light idk


r/Astronomy • • 12h ago

Astrophotography (OC) Butterfly Nebula (IC 1318)

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214 Upvotes

I wasn’t sure exactly what I’d capture in just a few hours the other night, since the Butterfly Nebula seems to be a bit less popular target than the Crescent Nebula in the famous Sadr Region. The Butterfly is situated right by the star Sadr itself (the biggest star in this image!), and I have to say I’m impressed.

Check out the full photo at: https://app.astrobin.com/i/f2z2ot

Subs: 28 x 300s

Total integration time: 2h 20m

Equipment:

  • Telescope: William Optics Pleiades 111
  • Main camera: ZWO ASI2600MC Pro
  • Mount: ZWO AM5N
  • Filters: Optolong L-Ultimate 2"
  • Accessories: ZWO EAF Pro, ZWO 5x2 EFW
  • Guidescope: William Optics Guide Star 61
  • Guide camera: ZWO ASI220MM Mini

Processing:

  • Pleiades Astrophoto PixInsight
    • RC Astro BlurXTerminator
    • RC Astro NoiseXTerminator
    • RC Astro StarXTerminator
  • Adobe Photoshop 2026

r/Astronomy • • 1h ago

Astrophotography (OC) The Flaming Star Nebula IC 405

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• Upvotes

Captured in Bortle 4 skies with my 585mc Air and William Optics Redcat 51 v3. Just 50 mins of integration time!


r/Astronomy • • 8h ago

Astrophotography (OC) gestrige nacht … NGC 6823 / NGC 7822 seestar s30 pro 90 frames /30s

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50 Upvotes

r/Astronomy • • 10h ago

Astrophotography (OC) NGC 246 - Skull Nebula

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62 Upvotes

Taken with a Seestar S50 in a Bortle 4-5 area. After edits in Siril, this is 515x10sec of stacking


r/Astronomy • • 45m ago

Question (Describe all previous attempts to learn / understand) Do we see the same stars

• Upvotes

I'm in South Africa and 00:11 now as I type this. Was outside a while ago cause it's hot, and I can't get sleep. Then I wondered if we all see the same stars in the sky wherever you are. Is it different, like with the lunar eclipse where a certain geographical area only gets it...


r/Astronomy • • 12h ago

Astro Research Scientists discover that some of the universe's biggest explosions may have never happened at all

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66 Upvotes

r/Astronomy • • 7h ago

Astrophotography (OC) NGC 7023 (Iris Nebula)

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28 Upvotes

S30 Pro: Bortle 6.7: 12hrs integration: 10% 10sec, 15% 20sec, 25% 30sec, 50% 60sec, anything above 3.5FWHM or below 100 stable stars got culled.

Stacked and processed in Siril, James Ritson's Affinity Photo Astrophotography macros for post stretch editing.

Final masks for cleanup & cropping in LR mobile

Biggest hurdle? Figuring out what version I liked the most so I said screw it made a couple both wide angle and close up to the cluster.


r/Astronomy • • 18h ago

Astrophotography (OC) Standing next to the core.

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219 Upvotes

r/Astronomy • • 10h ago

Other: [Topic] I took a picture of the ISS with my phone and telescope

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46 Upvotes

Shot on IPhone 16 + through my Celestron StarSense Explorer DX 130 AZ in the pro camera app


r/Astronomy • • 2h ago

Astrophotography (OC) Hyperlapse with startrail 💫

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6 Upvotes

Last week in my backyard with the S23ultra


r/Astronomy • • 21h ago

Astrophotography (OC) Sh2-157 | The Lobster Claw Nebula (SHO)

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112 Upvotes

Acquisition details
Target: Sh2-157 (Lobster Claw Nebula), Cassiopeia
Location: Fort Mill, SC, USA (Bortle 6)
Dates: October 2026, 4 nights

Equipment
Telescope: Askar 103APO (700mm, f/6.8)
Camera: ZWO ASI2600MM Pro
Mount: ZWO AM3N
Filters: Antlia 3nm Ha / OIll / SIl, Antlia V-Pro R / G / B
Filter wheel: ZWO EFW
Focuser: ZWO EAF
Guiding: SVBony guide scope + ZWO ASI220MM Mini Control: ZWO ASlair Plus

Integration
Ha: 45 × 500s (6.3 h)
OIII: 53 × 500s (7.4 h)
SII: 60 × 500s (8.3 h)
RGB (stars): 15 × 120s each (1.5 h)
Total: 23.4 hours
Gain 100, cooled to - 10°C
Calibration: 500s: 25, 120s: 25 darks, Ha: 50, OIll: 50, SIl:
50, R: 50, G: 50 B: 50 flats, 50 bias

Processing (PixInsight 1.9.5)
WBPP (PSF Signal Weight, Local Normalization, cosmetic correction)
GradientCorrection, BlurXTerminator
GHS stretch with highlight protection on the bright core StarXTerminator, NoiseXTerminator
NarrowbandNormalization (SHO palette)
Curves, masked core dimming, DarkStructureEnhance, LocalHistogramEqualization, SCNR
RGB stars: SPCC, BlurTerminator, GHS, StarTerminator, black-point clip, screen-blended back in


r/Astronomy • • 9h ago

Astro Research Remains of extremely rare cosmic ‘gold factory’ discovered

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6 Upvotes

r/Astronomy • • 1d ago

Astrophotography (OC) The Question Mark Nebula - NGC 7822

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449 Upvotes

NGC 7822 is a large emission nebula in the constellation of Cepheus that has some resemblance to a question mark. This image however does not show the circular dot part of it, which is located far below this.

This is 3 hours of frames (386 x 30sec for 3 hours and 13 minutes total integration) from a bortle 6 location, shot on a Seestar S30 Pro.

I'm very pleased with how it came out! It looks a little like a face from this angle.


r/Astronomy • • 1d ago

Astrophotography (OC) NGC 869 - 884 THe Double Cluster in Perseus

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221 Upvotes

NGC 869–884, the Double Cluster in Perseus: this image represents 11 hours of RGB integration using a Takahashi 106/530 f/5 wide-field refractor and a ZWO ASI2600 MM Pro camera. It consists of 133 exposures—comprising 39x300s (Red filter), 47x300s (Green filter), and 47x300s (Blue filter)—processed with PixInsight and Photoshop. All data and images were acquired via Telescope Live.


r/Astronomy • • 1d ago

Astrophotography (OC) M 33, Triangulum galaxy

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132 Upvotes

Telescope: Skywatcher dob 8 1200/200 f/6.

Mount: homemade EQ platform

Total exposure time: 1 hour 35 minutes (230x25s subs, ISO 2500 + 40 darks, 30 flats, 30 biases.)

Camera: unmodified Nikon D800

Bortle 5

07.10.2026

Around the stars, you can see not 4, as usual with Newtonians, but 8 diffraction spikes. The reason is that the EP provides a little more than an hour of tracking, and after that you need to reset it, and the field of view rotates a bit. With every hour of exposure you will be add 4 spikes to the final image)

Stacked frames in Siril, background extraction and denoise in Graxpert, photometric CC and stretch in Siril (stretch by Veralux automatic stretch script).


r/Astronomy • • 1d ago

Astrophotography (OC) Pleiades (known as Matariki in NZ) over Aoraki/Mount Cook (OC)

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1.2k Upvotes

I wasn’t even planning on capturing this image, but while waiting for another composition I realised this shot would be possible and couldn’t help myself but to shoot it. This night was super calm, giving me some absolutely perfect reflections in the lake, unlike anything I’ve ever seen before. There was a very small window in the night when the alignment would work, giving me about 5 minutes to create the image, ensuring the cluster would be centred above the mountain.

Matariki is a significant cluster all around the world, but particularly here in Aotearoa, its rising in mid-winter signals the beginning of the Māori New Year. It’s celebrated as a time to connect with friends and family, share kai (food) and set goals for the future.

NO AI was used in the creation of this image.

IG: @jshmcguigan

Captured on Nikon Z6a + Sigma ART 40mm F1.4


r/Astronomy • • 20h ago

Astro Research Catching the Culprit Behind Globular Clusters’ Disappearing Binaries

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20 Upvotes

r/Astronomy • • 14h ago

Astro Research NASA's Chandra Breaks Down 'Treble Clef's' Galaxy Cluster Collision

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7 Upvotes

Chandra observations suggest the “Treble Clef” radio structure was created by a supermassive black hole outburst and later reshaped by a collision between galaxy clusters.


r/Astronomy • • 1d ago

Astrophotography (OC) NGC 6995/6992 (Eastern Veil)

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69 Upvotes

Telescope: Skywatcher dob 8 1200/200 f/6.

Mount: homemade EQ platform

Total exposure time: 32 minutes (146x13s subs, ISO 2500 + biases.)

Camera: unmodified Nikon D800

Bortle 5

19.09.2026

Back then I didn't shoot the planned number of frames because there were heavy dew and I had to stop a session. Some of the shoots got ruined and I was upset and forgot to do darks and flats:). Also there were some problems with tracking, that I've partly solved now. Stacked frames in Siril, background extraction and denoise in Graxpert, photometric CC and stretch in Siril (stretch by Veralux automatic stretch script).


r/Astronomy • • 1d ago

Other: [Topic] PHYS.Org: Strong magnetic fields could allow white dwarfs to grow beyond the Chandrasekhar limit

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19 Upvotes