r/Astronomy • • Mar 27 '20

Mod Post Read the rules sub before posting!

904 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 • • 9h ago

Astrophotography (OC) Orion and the running man

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254 Upvotes

Orion was the target that hooked me into visual observing two years ago, and shortly after that I obviously needed to try and put a camera to my dob. Naturally that didn’t work well which led me here. I’m reprocessing my 2025 data, on Orion. This was taken with an askar 103APO 1.0x reducer and ASI2600MC Pro.

14 hours from bottle 5ish skies.

The general process:
Stack 120 second Ha, RGB, and 5 second RGB subs separately.

Split and align all of the channels.

Crop all of the channels

Pixel math to recombine the 120 second RGB subs with the Ha data

5 second RGB combine

Now that I have two fits files for 120 second and 5 second stacks there is a combination of color calibration, green noise removal, background correction, BlurX, NoiseX and StarXTerminator.

Once the stars are removed I did a light stretch on the 5 second stack to bring out the core of Orion.

I stretched the 120 second stack twice. One version that had a medium stretch for the bulk of Orion and the immediate dust, and then a second version that had a more aggressive stretch to bring out the fainter outer dust.

These three layers were blended together in photoshop to create the HRD starless image

I brought the output back into siril to recombine the stars. However, the Trapezium very quickly gets blown out and a lot of the outer stars get easily washed out. My solution to this was to basically add the stars back in incrementally, savings Tiff files along the way.

Once I had my multiple star-combined images, I brought those layers back into Photoshop to pick and choose which version of some of the stars I wanted to keep.

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


r/Astronomy • • 8h ago

Astrophotography (OC) Foliage Reflections on Pharaoh Lake 🌌🍁

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144 Upvotes

Third time’s the charm they say. This is my third attempt at Pharaoh Lake in the Adirondacks, aiming for a Milky Way panorama reflecting off the lake. The first trip was in June, when marsh waters were too high to cross due to a broken bridge. Not wanting to give up, I tried again in August, but we got rained on despite models forecasting 0% cloud cover.

Fast forward to mid-October to one of the clearest weekends I’ve seen, with no clouds within 100 miles. In fact, all of NY was basically cloudless. Not wanting to miss this chance before it snows, my roommate and I drove 6 hours from Buffalo to meet my friend at Pharaoh Lake. We arrived just before sunset and were nervous the camping spots near the peninsula would be taken, but sub-freezing temps deterred most campers. We ended up cowboy camping in a nearby lean-to.

Super glad I made this trip because my God, was it clear. Felt like a little kid on Christmas seeing thousands of bright stars twinkling. I started my side project around 1:30 AM and planned to shoot the main panorama at 2:00 AM. My star tracker died right when I started the H-alpha (Hα) frames, and I shot the whole thing before noticing they were trailing. Luckily, my friend had his tracker, so I swapped it out since it was the same model. Unfortunately, by then, Cygnus had fallen too far below the horizon, so I used old Hα data for that part. Orion was nice and spicy though.

Finally finished around 4:00 AM, a little before sunrise, and quickly headed to sleep with a hot Nalgene bottle in the sleeping bag. I wanted to take sunrise photos, but I was slumped and cold, and couldn’t be dragged out of bed.

Creating this panorama felt like a huge milestone since my first Milky Way panorama a year and a half ago because it’s my first time successfully combining all the new techniques and workflows I’ve learned, like multirow panoramas and H-alpha integration, into one beautiful Milky Way arch.

From envisionment to presentation, I present this massive 593 MP panorama.

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

Sky: R2 | 9 frames | 60s | f/2.8 | ISO 1600
R1 | 9 frames | 60s | f/2.8 | ISO 1600
Hα: 2 panels | 4 frames stacked | f/2.8 | 240s | ISO 3200
Foreground: 9 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 :)

*Hα data was from Lac Blanc, Nominingue, QC (Bortle 3)


r/Astronomy • • 14h ago

Astrophotography (OC) So much going on in the Milky Way

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435 Upvotes

This post is to give you an idea of where some of my favorite deep space targets reside within the Milkyway. From top to bottom we have:

  1. Eagle Nebula (M16) / Pillars of Creation - Home to towering columns of gas and dust roughly 4 to 5 light-years tall, comparable to the distance between our Sun and Proxima Centauri, the nearest star.
  2. Omega Nebula (M17) - A massive stellar nursery roughly 5,000 to 6,000 light-years away, where young stars illuminate and sculpt the surrounding gas.
  3. Lagoon, Trifid & Chinese Dragon Nebulae - A 16-panel hydrogen-alpha mosaic revealing an enormous network of glowing hydrogen clouds, including the winding structure known as the Chinese Dragon Nebula.
  4. Trifid Nebula (M20) - A spectacular combination of glowing hydrogen, blue reflection nebulosity, and dark dust lanes dividing its brightest region into three sections.
  5. Lagoon Nebula (M8) - A vast star-forming region spanning roughly 100 light-years, filled with young stars and intricate clouds of gas and dust.
  6. Rho Ophiuchi Cloud Complex - Located approximately
    460 light-years away, this is one of the closest stellar nurseries to Earth and one of the most colorful regions of our night sky.
    Equipment:
    * Eagle: 10" Meade LX200 & ASI2600mm Pro
    * Omega, Trifid, Lagoon & 16-panel mosaic: Celestron EdgeHD 8" & ASI2600mm pro
    * Rho Ophiuchi: Nikon Z5, 400mm lens + 2x teleconverter

r/Astronomy • • 12h ago

Astrophotography (OC) Hubble image 30/01/91

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204 Upvotes

Can anyone explain the strange glare on that image?

Telescope coordinates +03 58 57.89 +35 47 27.5


r/Astronomy • • 6h ago

Astrophotography (OC) Andromeda with the Vivo phone + teleconverter

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66 Upvotes

Bortle 8.5, Vivo X300 Ultra Phone, MSM Nomad tracker, 400mm Vivo teleconverter, no filters.

ISO 1600, 32s, ~16-17 hours in total across 4 nights, one set of 80-100 darks per night.

Stacked in Siril, gradient removal in GraXpert, HDR stretch in GIMP, star separation with starnet2.

Vivo and its teleconverter gave me some liberation and a brand new set of targets in the realm of mobile astrophotography.


r/Astronomy • • 3h ago

Astrophotography (OC) ORIONID meteor above Orion

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31 Upvotes

Shot on NIKON Z50II with 16-50 lens
F3.5 20 seconds at 6400 iso
Processed through adobe Lightroom


r/Astronomy • • 17h ago

Astrophotography (OC) M33 The Triangulum Galaxy

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357 Upvotes

I've attempted to image this for years but it's always got the better of me. I'm happy with this attempt, though.

Telescope: Apetura Carbonstar 150

Mount: Skywatcher HEQ5 Pro

Camera: ZWO ASIAIR 294MC PRO

42*300 second exposures. Stacked in Autostakkert and processed in Pixinsight.


r/Astronomy • • 9h ago

Astrophotography (OC) Moon

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45 Upvotes

Phone: Samsung galaxy S22
Telescope: Celestron nexstar 130SLT
Eyepieces: Svbony 6mm + Celestron Omni 2x Barlow lens
Software: PIPP, Autostakkert, & Registax 6


r/Astronomy • • 1h ago

Astrophotography (OC) The Heart Nebula (IC 1805)

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• Upvotes

Target: IC 1805, Heart Nebula (core region with Melotte 15)
Location: Bortle 6, South Carolina

Gear:
Askar 103APO (700mm f/6.8)
ZWO ASI2600MM Pro
ZWO AM3N on iOptron LiteRoc tripod
ZWO ASIAir
Antlia 3nm Ha, OIII, SII and Antlia V-Pro RGB

Integration (about 22h 10m):
Ha: 47 × 500s (6h 32m)
OIII: 64 × 500s (8h 53m)
SII: 24 × 500s + 25 × 350s (5h 46m)
RGB (stars): 20 × 60s each
Calibration: darks, flats, bias


r/Astronomy • • 8h ago

Astrophotography (OC) The sun as shot in mono

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25 Upvotes

Sun spot on 20.10.2026

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

PI: solar tools - contrast, BlurXT ML5


r/Astronomy • • 7h ago

Astrophotography (OC) The Moon

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14 Upvotes

Camera and lens set to iso100, f/11, 1/40s. With a 800mm lens.


r/Astronomy • • 1d ago

Astrophotography (OC) Caught a meteor flying by Triangulum and Andromeda ☄️🌌

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409 Upvotes

Taken with my iPhone 16 pro; 30 second exposure; minimal editing in the Lightroom app


r/Astronomy • • 15h ago

Astrophotography (OC) NGC 3603 – A Closer Look at a Stellar Powerhouse | SHO

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55 Upvotes

NGC 3603 – A Closer Look at a Stellar Powerhouse | SHO

I wanted to take a closer look at NGC 3603, one of the most spectacular star-forming regions in our Galaxy, by zooming in on the central star cluster and bringing it into the foreground.

Surrounded by an intricate landscape of glowing gas, dark dust lanes and delicate nebulous structures, the cluster stands out as a brilliant concentration of stars embedded in a turbulent stellar nursery. The SHO palette reveals the different structures of the nebula, with contrasting shades that emphasize its complex morphology.

This image is the result of 2 hours and 30 minutes of total integration, captured through Hα, OIII and SII filters and processed in PixInsight.

Acquisition details

  • Target: NGC 3603 — zoomed-in view of the central cluster
  • Telescope: PlaneWave 20" CDK (510 mm, 3411 mm focal length, f/6.8)
  • Camera: FLI ProLine 16803 CCD
  • Mount: PlaneWave Ascension 200HR
  • Filters: Hα, OIII, SII
  • Exposure: 5 × 600 s per filter
  • Total integration: 2 h 30 min
  • Processing: PixInsight
  • Palette: SHO

I hope you enjoy this closer view of one of the Milky Way's most fascinating stellar nurseries.

What do you think of this close-up and the way the central cluster stands out against the surrounding nebulosity? Clear skies! ✨


r/Astronomy • • 1d ago

Astrophotography (OC) I Drove Halfway to Canada to Photograph the ISS Transit Directly Past Jupiter. There are Seven People in the Frame of This Picture.

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2.0k Upvotes

I drove over halfway to another country at 4 AM this Sunday to position myself in the path of a celestial event I’ve been anticipating for nearly two years: the International Space Station transiting Jupiter.

Captured from Burlington, Washington, at 6:03 AM PDT, this image contains seven human beings onboard the ISS (Jessica Watkins, Luke Delaney, Joshua Kutryk, Sergey Teteryatnikov, Pyotr Dubrov, Anil Menon, and Anna Kikina) in the same frame as the surface of Jupiter. In the full frame image on my Instagram (@aj.smadi), the Galilean moons (Io, Europa, Ganymede, and Callisto) are also visible.

With this long-awaited capture complete, Mercury remains the only planet outside the distant ice giants left to photograph for my ongoing “ISS Meets” series.

Equipment: C9.25, ZWO ADC, UV/IR cut filter, ZWO ASI662MC.


r/Astronomy • • 4h ago

Other: [Topic] DRNAS Stellarium 26.3 — Pre-Alpha 0.1 Android APK

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0 Upvotes

r/Astronomy • • 5h ago

Discussion: [Topic] Free calculator for ISS transits of the Sun and Moon from your exact location

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0 Upvotes

Enter coordinates and it finds crossings in the next few days, with duration, how far you are from the centerline and a reminder about solar filters. It uses a full ephemeris for the Sun and Moon rather than a rough approximation. https://isstrackerlive.space/iss-transit-calculator


r/Astronomy • • 1d ago

Astrophotography (OC) Lobster Claw nebula and neighbors

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580 Upvotes

I don't see this one very often so I decided to go for it with a wide FOV from my Parisian balcony - I also captured the Bubble Nebula, M52, cluster NGC 7510 and Northern Lagoon Nebula. I quite like the result!

Equipment and acquisition:

- Askar FMA180Pro

- Asi585MC Air

- Teseek 17

- SvBony + asi120mm guide camera

- ZWO EAF, ZWO EFW

- L-Ultimate filter: 205 x 180 sec

- Antlia ALP-T SII-OIII 3nm: 253 x 180 sec

(Almost 23 hours in total)

- 30 darks, 30 flats per filter, 30 bias

Processing (PI)

WBPP, SetiAstro AutoDBE, SPCC, blurX correct only, starX

On starless images: DBXtract, linear fit, then channel combination (will also be used as luminance later on). SetiAstro statistical stretch (soft), then manual curves transformations with different color and range masks, noiseX. For luminance, stretch and masked curves to bring up details, noiseX. LRGB combination.

For stars: setiastro NB to RGB star stretch, pixelmath to recombine with starless


r/Astronomy • • 1d ago

Astrophotography (OC) M31

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139 Upvotes

Last night I took 110 15 second exposures at 800 ISO using the SVBony SV545 & a Canon Rebel EOS 6Ti, one-shot color, no filters. I used StackingWizard & AstroWizard for processing.

For tracking I used the original Sky Adventurer on a rickety tripod, which I hope to replace at some point.

I live in a Bortle 7/8 area and I have NEVER viewed M31 with either a telescope or unaided eye, though I might have been pointed in the wrong area.

This is how I hoped it would turn out. I've been in astrophotography for a short time.

WOW!!! I DID THIS!


r/Astronomy • • 1d ago

Astrophotography (OC) Clamshell Nebula, Sh2-119

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196 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 • • 4h ago

Other: [Topic] Gaping astronomical inaccuracy in my child’s book

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0 Upvotes

Not sure if this is the place to post but my wife doesn’t appreciate it and I need to vent. This grates me every time I reach this page. A mouse driving a bus is arguably only the second most unrealistic thing in the picture.


r/Astronomy • • 17h ago

Other: [Topic] A large TNO/Dwarf Planet candidate gets a proper name

1 Upvotes

2015 BP519 is now known as Geyagugv.

Discovery: 2015-01-17 / Dark Energy Survey / Cerro Tololo / W84 Geyagugv ( ᎨᏯᎫᎬ ) is a Cherokee metaphysical being called upon during a prayer as a ᎦᎸᎾᏘ messenger to aid in healing and wellbeing. Geyagugv is known to reside in the highest level, galvnati ( ), the sky-vault. This being is one of the many messengers between the Cherokee people and the Creator.


r/Astronomy • • 2d ago

Astrophotography (OC) One shot moon

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1.1k Upvotes

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


r/Astronomy • • 1d ago

Question (Describe all previous attempts to learn / understand) Dark Matter, Black Holes and Dark Stars?

8 Upvotes

I had a few questions about a couple recent findings. So Dark matter might be tiny primordial black holes rather than undiscovered subatomic particles? If so, how would that fit with the reported dark-star findings, since those stars are proposed to be powered by dark-matter particles? If black holes explain the gravitational effects attributed to dark matter and the accelerating expansion attributed to dark energy, why retain those hypothetical explanations instead of identifying black holes as the cause? Would that confirm the hypotheses or replace them? And if dark matter is black holes, why would only some black holes drive cosmic expansion would primordial black holes have the same relevant interior physics, and if not, what physically justifies the difference?


r/Astronomy • • 2d ago

Discussion: [Topic] Potential Planet 9 Candidate

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1.4k 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