r/Astronomy • • Mar 27 '20

Mod Post Read the rules sub before posting!

898 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 • • 16h ago

Discussion: [Topic] Potential Planet 9 Candidate

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1.1k Upvotes

Unusually faint, it has a weird tilt and a retrograde orbit. They say it’s 7-17 earth masses but since it’s unusually faint we can narrow it down to 7-14 earth masses. It is also impossible for random noise to act like a planet so it may be real. What can explain its retrograde orbit is that it is the 5th giant that didn’t get fully ejected due to some debris. Link: https://www.skyatnightmagazine.com/news/planet-9-iras-akari-survey-evidence


r/Astronomy • • 13h ago

Astrophotography (OC) One shot moon

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665 Upvotes

Moon photo taken with Nikon Z8 and Takahashi TSA-120 telescope. One frame processed in Photoshop.


r/Astronomy • • 11h ago

Astrophotography (OC) 1er essai paysage au téléphone

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193 Upvotes

La voie lactée plonge dans les côtes de la manche

Bortle 6 avec quelques nuages

S25 ultra

1h30 (poses 20s)

Iso 800


r/Astronomy • • 8h ago

Astrophotography (OC) Today's Sun 20.10.2026

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88 Upvotes

Acuter 40

Touptek 678 mono

ZWO EAFN

Skywatcher solar quest mount

Best 6000 of 12000 frames stacked

Stacked in PIPP and AS4

Impgg: convolution sharpening and inversion

PI: solar tools - contrast and color, BlurXT ML5

PS: color, contrast and saturation


r/Astronomy • • 14h ago

Astrophotography (OC) The Rise of Orion 🌌🏹

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267 Upvotes

Have always wanted to get a shot of Orion with its beautiful red H-alpha (Hα) emission. Usually, my schedule doesn’t line up well for the winter Milky Way season because of the frigid temperatures and college, but this weekend the clear skies and perfect conditions were too tempting, so I drove 6 hours out to shoot this beauty. And I’m super glad I did. 

Now this is my first time capturing Orion the way I’ve always envisioned it. When I first got into astrophotography, it was during the winter of 2024. Orion was one of my first targets I shot, and I always wonder how people shot those red burning flames surrounding the constellation. I kept trying to get that shot with my stock Canon R6, and it would never work out. Little did I know, it required using a modified camera and an Hα narrowband filter to get that signal fully.

Looking back now, I’m glad I was faced with all those dead ends and kept learning. I wouldn’t have appreciated the craft if I knew all the answers right away. The most fulfilling part of astrophotography is that it’s an endless masterclass that always brings me back for more. 

So now, I present to you Orion, in all its glory, reflecting off Pharaoh Lake in the Adirondacks.

📸 Shot on my Astro-modified Canon R+ EF 24-70mm f/2.8 II

Sky: 2x3 panels| f/2.8 | 60s | ISO 1600
Hα: 4 frames stacked | f/2.8 | 240s | ISO 3200 
Foreground: 3 panels | f/2.8 | 180s | ISO 1600

Processed using Adobe Photoshop, Lightroom, Pixinsight, Auriga Registar, and ASTAP

Check out more of my work on my Instagram and website!

Remember to Leave No Trace :)


r/Astronomy • • 20h ago

Astrophotography (OC) Wizard Nebula With 6" Apo From My Backyard

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477 Upvotes

Total integration: 8h 40m

Integration per filter:

- Hα: 4h 10m (50 × 300s)

- SII: 3h 40m (22 × 600s)

- OIII: 50m (5 × 600s)

Equipment:

- Telescope: Explore Scientific ED APO 152mm f/8 FCD1 ED

- Camera: ZWO ASI6200MM Pro

- Mount: 10Micron GM2000 HPS II

- Filters: Chroma H-alpha 5nm Bandpass 50x50 mm, Chroma OIII 3nm Bandpass 50x50 mm, Chroma SII 3nm Bandpass 50x50 mm

- Accessories: Explore Scientific 3" 0.7x Reducer (FFFR507X-00), PrimaLuceLab EAGLE4S, Starlight Xpress Maxi USB filter wheel, WandererAstro WandererCover V4-EC

- Software: Pleiades Astrophoto PixInsight, Stefan Berg Nighttime Imaging 'N' Astronomy (N.I.N.A. / NINA)

https://app.astrobin.com/i/lmhurr


r/Astronomy • • 13h ago

Astrophotography (OC) Arp 273

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94 Upvotes

Astrobin Top Pick

Taken from Bortle 6 Location on the nights of October 2 and 4, 2026

Equipment and Imaging Details: - ZWO ASI2600MC Air - ZWO Electronic Automatic Focuser (2025) - Apertura CarbonStar 200 (with Primary Mirror Mask) - Apertura 2" Coma Corrector - Apertura Dew Shield - ZWO AM5N - ZWO CAA - Gain 100 - -10° C cooling - 196 x 180" light exposures (82 + 114), 30 x biases, 60 x flats (30 each night)

PixInsight Processing: - WeightedBatchPreprocessing - BlurXTerminator (Correct Only) - SpectrophotometricFluxCalibration - MultiscaleGradientCorrection - SpectrophotometricColorCalibration - BlurXTerminator - StarXTerminator - MultiscaleAdaptiveStretch (separate HistogramTransformation and ScreenTransferFunction for stars only image) - CurvesTransformation - NoiseXTerminator - PixelMath (recombine stars only and galaxy images)

https://app.astrobin.com/i/b3z240


r/Astronomy • • 11h ago

Astrophotography (OC) Rookie's First Deep Space Photo (Pleiades)

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50 Upvotes

I live in the city where there's too much light pollution. But I took a vacation out to a bortle 1 sky under the recent new moon phase and decided to try to capture Pleiades's reflection nebula with my camera. I know this isnt as detailed as most thats posted on here. But I'm quite proud and happy with my results.

Camera: Canon R5

Lens: Canon ef 75-300mm F5.6 (cheapest Canon lens) w/rf converter

Star Tracker: MSM Nomad on top of my tripod

Took 100 2 min exposures. 87 were deemed ok by me. 13 had some issue with the heavy winds we had that night that left a fur ball of star trails around the stars.

Stacked in deepskystacker. No dark/bias frames (totally forgot to do them).


r/Astronomy • • 6h ago

Astrophotography (OC) M31 By APO 400mm in desert

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16 Upvotes

I captured this image during this year’s summer vacation at a campsite in China’s Tengger Desert—a location with a Bortle Class 2 sky (low light pollution).

The equipment used included an FRA400 400mm APO refractor, a APS-C cooled astronomy camera, and a harmonic-drive equatorial mount.

No filters were used.

Unfortunately, the Aerosol Optical Depth (AOD) was around 0.1 that day—higher than the typically low AOD levels usually found in this region. I suspect this might have been due to moisture transport from a typhoon in the Pacific Ocean at the time.

This is my first time posting in this community; please let me know if there’s anything I could improve upon. Thank you!

Telescope: FRA400 f/5.6

Mount: Dual 17 Harmonic Drive Equatorial Mount

Camera: ASIAIR 2600MC APS-C Cooled Camera

Uses ZWO guiding system

The processing software is Siril.


r/Astronomy • • 21h ago

Astrophotography (OC) Double Cluster

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160 Upvotes

The beautiful Double Cluster! These two star clusters are NGC 869 and NGC 884. They are about 7,000 light-years away and only separated by a few hundred light-years. Estimated to be about 13 million years old!

Telescope: Seestar S50
Integration time: 1 hour (it's a 2-panel mosaic, so 1 hour on each panel)
Tools used: Siril, GraXpert, GIMP
Script mentions: DeepSNR, HDR_multiscale, VeraLux (Revela & Curves)
Bortle 8-9


r/Astronomy • • 22h ago

Question (Describe all previous attempts to learn / understand) I'm looking for help in characterizing these places in Milky Way

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138 Upvotes

Hi! I'm having a little project of mine, and I had a huge problem with finding something characteristic about the places of the Milky Way that are shown in red in the pictures.

As it's for my imaginary sci-fi universe, I should have ask this in other sub-reddits, but I think that going with these questions to the astronomy profesionals would get me the best prominent answers.

So, back to the question. I want tho know:

1 - If these places are theoretically good locations for setting up a habitable planet

2 - what is special about these regions of the Milky Way? Some celestial objects? Stars? Nebulas? Is anything even known about parts of our galaxy further away than 1000 light years from our planet?

I tried to find infromations on google but found nothing, as my question is too specific. Even used AI as the last resolve, but also haven't found anything. The Milky Way maps only show star clusters above or below the main disc as far as im concerned.


r/Astronomy • • 1d ago

Astrophotography (OC) Horsehead and Flame Nebulae, 91 minutes (OC)

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453 Upvotes

r/Astronomy • • 6m ago

Astrophotography (OC) Clamshell Nebula, Sh2-119

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• Upvotes

​

✨EXPOSURE DETAILS 🌌

🎯 Target: Clamshell Nebula, SH2-119

🔭 Telescope: William Optics Spacecat51 V1

📷 Camera: ZWO ASI2600MC - Pro

🏗️ Mount: ZWO AM5 w/TC40

🎯 Guide Scope and Camera: William Optics UniGuide + ZWO 290mm mini

🌈 Filters: Optolong L-eXtreme

🌌 Bortle Scale: 4

Social: https://www.instagram.com/lowell_astrophotography?srtk=M3FjZXEycTUyZGg5

⏱️ INTEGRATION TIME

⚪ 180 sec x 175

Total Integration: 8h 45m

💻 Control: ASIAIR Plus

⚙️ Editing: PixInsight + Lightroom


r/Astronomy • • 1d ago

Astrophotography (OC) M42 The jewel in Orion's Belt

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710 Upvotes

Seestar 30P, Bortle 6.7, used NINA to capture. 30x10sec, 50x60sec processed in Siril LR mobile for masks and coloring.

First time capturing this with having only one good late night (last night the fog rolled in). I'm still shooting for 4hrs of integration time but I've got a good base to build off of.


r/Astronomy • • 18h ago

Astro Research Euclid discovers new comet

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13 Upvotes

r/Astronomy • • 1d ago

Astrophotography (OC) Polaris, the North Star and all the dust surrounding it

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897 Upvotes

For this shot I stacked 25 hours of data at 135mm, my first time using this focal length.

https://www.instagram.com/igneis.nightscapes/

These dusty structures are usually found at high galactic latitudes, above and below the Milky Way band, but this area has a big concentration of them. It’s quite curious that the star we use in the Northern Hemisphere to polar-align our trackers is, in a single photo, nothing but a star field, and after putting hours into it, the details that emerge are astonishing, revealing all the Integrated Flux Nebula. So many structures, dust waves and defined shapes, with no light of their own, just illuminated by the combined light of the Milky Way’s stars.

Shooting an area like this feels strange. When I shoot the Milky Way, I can clearly see that I’m going home with data, but here there was nothing to see at first glance. With time and patience, what looked empty ended up packed with endless structures.

EXIF:

754 shots of 120s, ISO 640, f/2

Sony a7IV astromodified

Samyang 135mm f/2

ZWO AM3n


r/Astronomy • • 1d ago

Astrophotography (OC) Ina (The blue lava lake) unprocessed, through a 10" reflector and an iPhone !!!

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21 Upvotes

r/Astronomy • • 1d ago

Astrophotography (OC) Deep dive into M33

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250 Upvotes

M33 is one of the closest large galaxies to the Milky Way. It is a perfect spiral galaxy, so it is imaged often. It is also very hard to image.

Link to full res: https://app.astrobin.com/i/5o0xeu

Over the years, I've imaged it a dozen times and I'm never happy with it. I have usually imaged from my backyard in Midtown Atlanta, and the light pollution just overpowers it. But then I go to a dark site and find that 1 or two nights is still insufficient. It is a bright galaxy, but very diffuse. It is difficult to get both the detail and the color.

I sent my scope to a remote observatory in Texas, I get to image from a Bortle 1 every clear night. Top on my list was my galactic nemesis: M33. This is a 37 hour integration, including ~10 hours of narrowband (HA/OIII).

It was so hard to process, but I'm feeling ok about it. A couple things I'd like to point out. First, see the subset image. These rings are only visible in narrowband. They are remnants of supernova from long ago. Second, notice how the spiral arms are a little granular.. it almost looks like noise. But zoom in: I was resolving individual stars across the entire disk. This galaxy is 4 million light years away and I was able to resolve individual stars. That is crazy that we can do that using off the shelf equipment.

I'm still going to take a few more nights collecting data, but I'm interested in what reddit has to say. Thank you for viewing, I hope you enjoy it.

Total integration time: 37.9 hours.

Scope: Explore Scientific 127mm FCD-100 refractor

Camera: ZWO ASI 2600mm

Filters: Optolong Luminance, ZWO RGB, Antlia 3nm narrowband

Mount: ZWO AM5

Location: Starfront Observatories, Rockwood Texas.


r/Astronomy • • 1d ago

Question (Describe all previous attempts to learn / understand) How can I find out if this specific crater is bigger or smaller than Houston(Texas)?

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223 Upvotes

I borrowed the moon photo from a top post in this sub, hope is ok


r/Astronomy • • 2d ago

Question (Describe all previous attempts to learn / understand) I still don't quite understand how is this photo realistic, is it done just by stacking many photos of the same region and nothing else? There's no Photoshop and any other modifications whatsoever?

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1.2k Upvotes

r/Astronomy • • 1d ago

Astro Research Green, pink and purple: astronomers reveal the surprising true colours of white dwarf stars

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warwick.ac.uk
16 Upvotes

r/Astronomy • • 20h ago

Astro Research Not All Black Holes Who Wander Are Lost

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aasnova.org
4 Upvotes

r/Astronomy • • 1d ago

Discussion: [Topic] Went out to look at the sun with my local astronomy club NSFW

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122 Upvotes

Always a blast to go out and show the public what telescopes are capable of

My telescopes are the two on the far left, a 3d printed 114 f3.9 Newtonian design I remixed, with my designed solar filter (look up xypris on printables) and the seestar s30pro with the solar filter

How many of y'all meet up with your local astronomy clubs, id love to hear y'all's stories


r/Astronomy • • 1d ago

Astrophotography (OC) M33 The Triangulum Galaxy - RGBHaO

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115 Upvotes

I added 5 hours of dual narrowband data to a 12hr RGB broadband image to get this 17hr Halpha and OIII enhanced image. The process:

Split R G B Ha O O

Register

Continuum Subtract Halpha using pixel math in Siril (Ha - X*(R - med(R))) where X is about .05-.07 to get HaC

Do the same for OIII from the Green channel and OIII from Blue. For each, subtract X*HaC where X puts any Ha that leaked through back equal with the background (for me ~.2)

Add the OIII from G and C images together for final OC

Do an HaC - X*OC for a final HaC image with any OIII that leaked through leveled out

Combine the aligned RGB, SPCC balance, re-split so we get a proper balance without the HaO data

Mix final HaC and OC into RGB - Ha I mix a 1/.7/.7 ratio into RGB and O I mix in .4/1/1. By mixing into all 3 channels we increase the effective luminance of the HaO data added.

I continue processing the rest from there as described in my previous images.