this post was submitted on 27 Jul 2023
76 points (98.7% liked)

pics

19595 readers
445 users here now

Rules:

1.. Please mark original photos with [OC] in the title if you're the photographer

2..Pictures containing a politician from any country or planet are prohibited, this is a community voted on rule.

3.. Image must be a photograph, no AI or digital art.

4.. No NSFW/Cosplay/Spam/Trolling images.

5.. Be civil. No racism or bigotry.

Photo of the Week Rule(s):

1.. On Fridays, the most upvoted original, marked [OC], photo posted between Friday and Thursday will be the next week's banner and featured photo.

2.. The weekly photos will be saved for an end of the year run off.

Weeks 2023

Instance-wide rules always apply. https://mastodon.world/about

founded 1 year ago
MODERATORS
 
all 7 comments
sorted by: hot top controversial new old
[–] lefty7283@lemmy.world 6 points 1 year ago (2 children)

The Antennae Galaxies (NGC 4038/4039) are a pair of colliding galaxies about 65 million ly away. The collision over the last few hundred million years has resulted in streams of ejected stars, forming the 'antennae'. Despite having guide camera issues for the first hour of the night, and horrific seeing/guiding error/HFR values, this somehow turned out decent. I've also made an annotated version which highlights background galaxies in the uncropped FOV.

Captured on April 20th, 2023 from the Deerlick Astronomy Village (Bortle 3)

Places where I host my other images:

Instagram | Flickr


Equipment:

  • TPO 6" F/4 Imaging Newtonian

  • Orion Sirius EQ-G

  • ZWO ASI1600MM-Pro

  • Skywatcher Quattro Coma Corrector

  • ZWO EFW 8x1.25"/31mm

  • Astronomik LRGB+CLS Filters- 31mm

  • Astrodon 31mm Ha 5nm, Oiii 3nm, Sii 5nm

  • Agena 50mm Deluxe Straight-Through Guide Scope

  • ZWO ASI-~~120mc~~ 290mc for guiding

  • Moonlite Autofocuser

Acquisition: 3 hours 52 minutes (Camera at half Unity Gain, -15°C)

  • L- 55x120"

  • R - 21x120"

  • G - 21x120"

  • B - 19x120"

  • Darks- 30

  • Flats- 30 per filter

Capture Software:

  • Captured using N.I.N.A. and PHD2 for guiding and dithering.

PixInsight Processing

  • BatchPreProcessing

  • SubframeSelector

  • StarAlignment

  • Blink

  • ImageIntegration

  • DrizzleIntegration (2x, Var β=1.5)

Luminance Linear:

  • DynamicCrop

  • DynamicBackgroundExtraction

  • BlurXTerminator (i caved)

  • NoiseXterminator

  • ArcsinhStretch+HistogramTransformation to bring nonlinear

RGB Linear:

  • DynamicCrop

  • DynamicBackgroundExtraction

  • ChannelCombination

  • SpectrophotometricColorCalibration

  • HSV Repair

  • AcrsinhStretch + HistogramTransformation to stretch nonlinear

Nonlinear:

  • added stretched luminance to stretched RGB via LRGBCombination

  • DeepSNR

  • shitloads of CurveTransformations to adjust hue, lightness, saturation, etc. (some with star masks)

  • more curves

  • LocalHistogramTransformation

Two round of this: one at kernel radius 16 for the finer 'feathery' details and one at 200 something for larger structures

  • SCNR green

  • CloneStamp to remove one weirdly saturated Ha region (it looked bad)

  • even more curves

  • NoiseX

  • UnsharpMask

  • curves!

  • BlurXTerminator (star reduction only)

  • MLT for chrominance noise reduction

  • guess what more curves

  • final curves

  • Resample to 70%

  • DynamicCrop again

  • annotation

[–] Deez@lemm.ee 2 points 1 year ago (1 children)

Wow, I don’t know what any of this means, but it’s a great shot, and looks like a lot of work went into it. How long did it all take?

[–] lefty7283@lemmy.world 1 points 1 year ago (1 children)

It took one night to actually photograph it (drove about 2 hours to a dark site away from the city), and then a few hours back at home to process the pic

[–] Deez@lemm.ee 2 points 1 year ago

Thanks for sharing your beautiful work!

[–] veloxization@yiffit.net 4 points 1 year ago

I'm so glad we have astrophotographers here as well. These are always so nice to look at.

[–] pbanana@lemmy.world 1 points 1 year ago

For a moment I thought the Center cluster looked similar to the gentoo logo