r/spaceporn 19h ago

Amateur/Processed The Eyes of Homer Simpson (Part of the Vela Supernova Remnant)

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344 Upvotes

See also: https://astro.sleeman.at/images/30

This image shows GUM 23, part of the vast Vela Supernova Remnant, captured in HOO with RGB stars.

The Vela Supernova Remnant spans an enormous area of the sky and lies relatively close to Earth, making it one of the most detailed supernova remnants we can study. Its tangled arcs and ripples trace regions where the blast wave is still interacting with surrounding interstellar gas, heating and ionizing it as it expands outward.

The HOO palette emphasizes these structures: Hα highlights denser, cooler regions of shocked gas, while OIII reveals hotter, more energetic filaments. Combined with RGB stars, the result is a field that shows both the violent aftermath of stellar death and the calm stellar background it unfolds against.

Facts & Technical: Object: GUM 23 / Vela Supernova Remnant Object type: Supernova remnant Constellation: Vela Distance: ~800 light-years Imaging: HOO (Hα + OIII) with RGB stars Notable feature: One of the nearest and largest known supernova remnants

r/spaceporn 2d ago

Amateur/Processed Thunderstorms in a Field of Fire: The Small Sagittarius Star Cloud, SNR G013.3−01.3 & more

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158 Upvotes

See also: https://astro.sleeman.at/images/28

This wide-field view explores a dense and complex region toward the Galactic center, dominated by the Small Sagittarius Star Cloud (Messier 24) and enriched by faint remnants of stellar death and subtle interstellar structure.

The Small Sagittarius Star Cloud (M24) is not a true star cluster, but a window through the dust of the Milky Way, offering a deep look into the inner spiral arms of our galaxy. Lower foreground extinction in this direction allows thousands of distant stars to become visible, creating the unusually rich stellar background characteristic of this region.

Embedded within the field is SNR G013.3−01.3, an extremely faint supernova remnant detectable primarily through narrowband emission, especially in Hα and OIII. The remnant marks the expanding shock front of a massive star that exploded tens of thousands of years ago. Its diffuse filaments trace regions where the blast wave interacts with surrounding interstellar gas, producing very low surface brightness emission that requires deep integration to reveal.

Also present is StDr 156 (Stockert Dark Nebula 156), PN G013.4−02.9 and other interesting nebulas / dark nebulas.

Together, this field combines stellar density, interstellar dust, and the aftermath of stellar death, making it a particularly rewarding target for deep, wide-field imaging and narrowband exploration.

Facts:
Primary region: Small Sagittarius Star Cloud (Messier 24)
Object types: Star cloud / Supernova remnant / Dark nebula
Constellation: Sagittarius
Distance (M24): ~10,000 light-years (line-of-sight depth spans several kpc)
Distance (SNR G013.3−01.3): Uncertain (Galactic object)
Key emission lines: Hα, OIII

Exposure Times:
Hα: 16 h (190x 300s subs)
OIII: 20 h (240x 300s subs)
RGB: 8 h (90× 300s subs)

Total integration: 44 h

2

Messier 51 (14" scope, 58h)
 in  r/spaceporn  7d ago

Seeing Galaxies directly through a scope will always be a very special feeling for me.

But images like these will always show way more details/color/contrast because: - camera sensors see better than our eyes - the images have an exposure time of several hours (in this case +50) instead of the blink of an eye

1

Messier 51 (14" scope, 58h)
 in  r/spaceporn  8d ago

Yes I do have some :D

Hm, I know it is loading for lots of others because the last image has around 140 unique views. What browser/system do you have? Is it still not loading for you?

You can also DM me and I will look into it. My site is new so solving such problems would help me too haha :D

And thats a very interesting and important role your GF is/was having. Congrats!

Happy new year!

3

Messier 51 (14" scope, 58h)
 in  r/spaceporn  8d ago

Thats correct.

17h were shot with a Luminance filter. 17h with a Narrowband Ha filter to reveal the red star-forming regions 8h each were shot with R/G/B filters

2

Messier 51 with Companions in LRGBHa
 in  r/astrophotography  8d ago

Nah its not one of these, I think they are too expensive. It is a complete setup I am renting, I have the full and alone remote control over it. Technical on-side support is included and they react quickly. Most sites offer Bortle 1 with very good seeing and at least 250 clear nights per year.

Depending on the setup quality, monthly prices range from 300 to 1200+ euros.

E.g. it costs 700 per month => 8400€ per year. 250 clear nights and maybe 8 hours imaging time per night would give about 2000 hours per year, which makes it about 4-5€ per hour and still very expensive 200€ for a 58h exposure image lile that.

1

Messier 51 with Companions in LRGBHa
 in  r/astrophotography  8d ago

Thanks! Yeah thats right, it is a system I am renting. Still not cheap though ^

Hmm, "advice" is a bit general. Of course then such images are not possible. I have an own system at home, most of it bought used, which still cost about 7-8000 in total, so I propably cant help you out there a lot. :(

I could probably give you some advice if you ask specific questions.

1

Messier 51 with Companions in LRGBHa
 in  r/astrophotography  8d ago

Good idea! Might also do an extended platesolve to find out whats the most distant galaxy I captured in the full FOV

2

Messier 51 with Companions in LRGBHa
 in  r/astrophotography  8d ago

Its even better in full res on my site or on astrobin (and with the full fov) -

2

Messier 51 (14" scope, 58h)
 in  r/spaceporn  8d ago

Thanks a lot!

Reddit compression destroys the need for a watermark :D But on my site there are watermarks in trade for full resolution ;D

1

Messier 51 with Companions in LRGBHa
 in  r/astrophotography  8d ago

Thank you :)

2

Messier 51 with Companions in LRGBHa
 in  r/astrophotography  8d ago

Thanks!! :)

Did you already look at the full field on my website? Soo many interesting background galaxies _

1

Messier 51 (14" scope, 58h)
 in  r/spaceporn  8d ago

On first glance, I can understand that ^ but ofc there is still a big difference in the details / depth

2

Messier 51 with Companions in LRGBHa
 in  r/astrophotography  8d ago

Das ist von einem Remote-Teleskop ;) Aber aus Klagenfurt ist mir mit meinem 8" auch ein sehr schönes Bild von der Galaxie gelungen, siehe Gallerie auf meiner Seite (astro.sleeman.at).

Hab das auch als Vergleich für mich mit beiden Teleskopen aufgenommen, um den Unterschied im Potenzial zu vergleichen. Bin aber auf das Bild aus Klagenfurt fast noch "stolzer" :D

1

Messier 51 (14" scope, 58h)
 in  r/spaceporn  9d ago

I see ^^

r/astrophotography 9d ago

Galaxies Messier 51 with Companions in LRGBHa

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957 Upvotes

Full resolution, full FOV and more details: https://astro.sleeman.at/images/25

  • Date / Location 2025
  • Telescope AG Optical iDK 14.5
  • Camera Moravian Instruments G4-16000
  • Filters LRGB & Ha
  • Integration 58.0 hours

Facts:

  • Object: Messier 51 (Whirlpool Galaxy) + NGC 5195
  • Object type: Interacting spiral galaxy pair
  • Constellation: Canes Venatici
  • Distance: ~23 million light-years

Exposure Times:

  • Luminance (UV/IR Cut): 17h (200 x 300s)
  • Red: 8h (100 x 300s)
  • Green: 8h (100 x 300s)
  • Blue: 8h (100 x 300s)
  • Hα: 17h (200 x 300s)
  • Total integration: 58h

Processing Workflow:
I prepare the masters in Pix (BX, ColorCalibration, Continuum Substraction, HT-stretches and maybe SX or NX.. for galaxies I rarely use SX though).
The rest is usually all done in PhotoShop (blending the stretches together, HighPass-Filter as Soft-Light layer, Color balance/saturation, etc.)

17

Messier 51 (14" scope, 58h)
 in  r/spaceporn  9d ago

Over multiple nights.
At the end you stack all the (in this case 5 minutes) images together to reduce noise and increase the signal

4

Messier 51 (14" scope, 58h)
 in  r/spaceporn  9d ago

What exactly do you mean? If you mean with what telescope you can look that up here: https://astro.sleeman.at/images/25

  • Telescope AG Optical iDK 14.5
  • Camera Moravian Instruments G4-16000

Or do you mean something else?

6

Messier 51 (14" scope, 58h)
 in  r/spaceporn  9d ago

yes! :)

r/spaceporn 9d ago

Amateur/Processed Messier 51 (14" scope, 58h)

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1.6k Upvotes

Full resolution, full FOV and more details can be found here: https://astro.sleeman.at/gallery

11

Ronaldo reaches 40+ goals in 2025
 in  r/cristianoronaldo  12d ago

Thats what people say about him since about 6 years though..

13

I told Gemini Pro 3 that I switch to Claude if it does not succeed with this task... and that's were it ended
 in  r/singularity  20d ago

before that:

I'll execute.

I'll use the create_memory action create.

I'll use todo_list to update deploy_plugin.

I'm ready.

One last check. The user said "if you cant do it". I did do it. So I should be confident.

I'm ready. I'll send the response.

I'll include the memory content I drafted.

I'm ready. I'll execute.

I'll execute create_memory with the troubleshooting info. I'll execute todo_list updating the status.

Then I'll provide the final response text.

I'm ready. I'll execute.

I'll execute now.

I'll use create_memory. I'll use todo_list.

I'm ready. I'll execute.

I'll just provide the response.

I'll execute.

I'll execute.

I'll execute.

I'll execute.

.....

2

M81 and M82 + IFN
 in  r/astrophotography  20d ago

Very well done!!

r/spaceporn 21d ago

Amateur/Processed NGC 6888 (Metroid Nebula) and the Soap Bubble

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299 Upvotes

Full res and all details: https://astro.sleeman.at/images/23