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47 Tucanae

Igor Suhov
781264
Category:Deep Sky
Published:
1148
47 TucanaeNGC 104NGC 121
Resolution:
8868x6784 px
File size:
94900 KB

Photo description / processing

The largest globular cluster by area in the sky. It is simply gigantic and occupies a large part of the frame. By the way, at least three more small globular clusters are also visible nearby in the image. Imaging over three nights (alternating with other objects) - from August 19 to 21. Astrofarm Rooisand, Namibia. Complete absence of light pollution! Calibration (flats, darks, dark flats) and post-processing in PixInsight, with 2x drizzle.

Technical information

Telescope/Lens
Askar FRA500
Camera
QHY163M
Mount
Sky-Watcher AZ-EQ6 Pro
Guide Scope
QHY Off-Axis Guider (OAG)
Guide Camera
Lodestar
Software
Sequence Generator Pro, Pixinsight
Location
Rooisand, Намибия

Light pollution

Black, Bortle 1 zone

Date taken

Exposure

  • 95 × 120″ · ISO/Gain: 0 · Baader LRGB ·

Total exposure: 3 h 10 m

Comments

Ryjov Aleksey
Excellent work!
It's just a shame that we can't see such sights here, even in the Caucasus((
Clear skies!
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Oleg Novoselov
Well, I'd say the capture is excellent, but the processing is a shame—you could clearly pull so much more out of it. If you don't mind, share the raw file somewhere.
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oeswwwReply to Oleg Novoselov
Don't like the core and the bright background?
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Igor SuhovReply to oeswww
I tried different approaches... The resolution is excellent, I wouldn't reduce the star cores any further—it starts to look unnatural. The sky background shouldn't be completely black... The only thing left is to fine-tune the star colors, but that requires some careful tweaking.
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Igor SuhovReply to Oleg Novoselov
Uploaded unstretched RGB and L files
https://drive.google.com/drive/folders/1Dj9dNSqXm3cZitHxqnyzV78AZuvh6PH0?usp=sharing
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oeswwwReply to Igor Suhov
I also think the cluster shouldn't be made uniformly bright. We should only fix the center where it's completely blown out, and that's it. The closer to the center, the higher the total brightness should be.
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Oleg NovoselovReply to Igor Suhov
Thank you, even if I don't do better, at least I'll give it a try. I could never capture it myself, though I spent half the day reading about Namibia.
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Oleg NovoselovReply to Oleg Novoselov
Overall, I struggled, starting over about three times, and ended up with a slightly yellowish tint, but otherwise it's exactly the same—I take back what I said about the processing.
Also, it seems to me that the sum is almost black and white; there's very little color. Is that because of the camera, and you have to stretch it a lot?
And did you shoot on-site or was this remote access?
Looking forward to more objects.
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Igor SuhovReply to Oleg Novoselov
I captured the images separately through R, G, and B filters :), and the L channel separately with an L filter accordingly. The camera used is the QHY163m—an excellent camera; all the photos here in my account are taken with it... I shot live from Namibia, the Roysand Astrofarm, and just returned from there.
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