iiinova — where your digital self keeps evolving

Andy Casely @deep-twilight.bsky.social · 17/08/2026

A cloudy total eclipse from Hellisandur Well, changing lenses with 8min to go as clouds thinned a bit was *not* recommended (eek!), but it was so exciting, a spectacular, almost spiritual view through thinner clouds for totality in Iceland. EOS6Dii @ 400mm. #totaleclipse #icelandeclipse

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Andy Casely @deep-twilight.bsky.social · 31/07/2026

Saturn, Rhea and spokes 6th July RGB image from a nice session a few weeks ago, some strong ring spokes are on the near-right side on the B-ring. There's a nice storm in the southern mid-latitudes, south is up. Rhea is to the left. Celestron C14, ZWO ASI585MM, 22mins, taken from the Blue Mountains.

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Andy Casely @deep-twilight.bsky.social · 16/05/2026

The image is a reprocess of my old data with current methods, plus using a wavelet decomposition technique to integrate IR data into the image - technique from Ittaku on CloudyNights, discovered via (the increasingly great) Tom Williams.

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Andy Casely @deep-twilight.bsky.social · 16/05/2026

The polar hexagon shows even better in a polar projection on WinJupos, where you can see the polar vortex at the centre, and the very distinctive hexagon surrounding the south pole. Various features of the big 2018 storm show up well. (2/3)

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Andy Casely @deep-twilight.bsky.social · 16/05/2026

A reprocess from the archives - Saturn in June 2018 in excellent conditions, rings tilted well towards us, showing off a substantial polar storm, as well as good definition of four sides of Saturn's polar hexagon. 1/3

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Andy Casely @deep-twilight.bsky.social · 28/04/2026

Yup, 17" is shorthand for 17 arc seconds (1" = 1/3600 of a degree or 1/1800 as wide as the Moon appears in our sky (30arcmin, or 30'). For other context, Jupiter is typically 35-45" wide

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Andy Casely @deep-twilight.bsky.social · 28/04/2026

Homunculus Nebula expansion - 2008-2026. A sequence of three images, comparing my backyard C14 image with the two HST images (2008 and 2019). The nebula expands from 17" to 21" in diameter and details such as the hole in the 'near' bubble end and jet-like equatorial blasts consistently grow outwards

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Andy Casely @deep-twilight.bsky.social · 27/04/2026

And Bluesky's image compression is doing some funky posterising things to the texture in the image 🙄

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Andy Casely @deep-twilight.bsky.social · 27/04/2026

Capture: Celestron C14 at f/28, ZWOASI585MM. 75% of ~21,000 IR642nm frames, preprocessed in PIPP, stacked in Austostakkert!3, sharpened in Registax 6. Colour data 2-2-2min R,G,B at 2x2 binning, luminance from IR642. #astrophotography

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Andy Casely @deep-twilight.bsky.social · 27/04/2026

Homunculus Nebula in colour Well this came out better than I thought... Captured on Saturday in perfect seeing. Texture in the bubbles, faint outer details, all consistent with HST and Damian Peach's 2017 1m telescope shot. No funky/AI tools here. Maybe the sharpest amateur image of this one?

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Reposted by Andy Casely

Russ Jones @russincheshire.bsky.social · 11/11/2024

Just for fun, let me tell you about somebody you've probably never heard of, but who was once one of the most famous people in England, a national hero, a disgraced fraudster, and an astonishingly accomplished piratical maniac. He led quite a life. (1/53)

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Andy Casely @deep-twilight.bsky.social · 18/03/2026

As forecast it was a bust from Sydney, solid grey clouds and showers all day, night & week (photo from the office). 😢 Classic astronomy event weather!

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Leigh Fletcher @leighfletcher.bsky.social · 12/03/2026

Any Sydney-based astronomers here? A team at Andalucia is coordinating an occultation campaign for one of Jupiter's small (2-5km) irregular moons, #Kallichore (a candidate for an #ESAJuice flyby) that'll be passing in front of a star at ~12:20UT on March 18th. opop.obspm.fr/media/data/c...

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Andy Casely @deep-twilight.bsky.social · 13/03/2026

I'm just south of the path, but the cloud cover forecast (though still 6 days out) is not at all promising for the east coast - easterly winds and extensive cloud. Fingers crossed it improves...

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Reposted by Andy Casely

Helen MC @crystallised-cricket.com · 02/01/2026

Day one of January Cricketpalooza - a net session with @deep-twilight.bsky.social, good to roll the arm over a bit.

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Dr Laura Driessen @astrolaura.com · 12/11/2025

Want to see the aurora? Tonight might be the night! There have been a bunch of coronal mass ejections (big flares of plasma) from the Sun that are all arriving at Earth today and tonight. theconversation.com/aurora-likel...

theconversation.com

Aurora likely tonight as string of solar flares heads for Earth

Four big outbursts from the Sun mean skies may light up much further from the poles than usual.

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Chanda Prescod-Weinstein 🌌 @chanda.blacksky.app · 29/09/2025

YES! THIS on GenAI! Please read this absolutely splendid piece of writing that had me cheering, a little bit weepy, and writing in the margins: "An extraordinary amount of money is spent by the AI industry to ensure that acquiescence is the only plausible response. But marketing is not destiny."

nplusonemag.com

Large Language Muddle | The Editors

The AI upheaval is unique in its ability to metabolize any number of dread-inducing transformations. The university is becoming more corporate, more politically oppressive, and all but hostile to the ...

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Andy Casely @deep-twilight.bsky.social · 27/09/2025

My social media manager for this one is Helen, but I'm pretty chuffed to win the Solar System category at the Malins for the third time in the last five years (move over Brisbane Lions, I'm doing back-to-back wins too 🤣). Congrats to the other winners and finalists too, some great images again

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Elise Cutts @elisecutts.bsky.social · 24/09/2025

Cecilia Payne-Gaposchkin ✨ figured out what stars are made of ✨ when she was just 25. 🔭🧪 Her PhD thesis basically established the Harvard astro department — at a time when Harvard didn't officially allow woman students. I wrote this little profile to mark the 100th anniversary of her thesis:

sciencenews.org

How a Harvard maverick forever changed our concept of the stars

At just 25, Cecilia Payne-Gaposchkin applied quantum physics to a treasure trove of astronomical observations to show that stars are mostly hydrogen and helium.

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Andy Casely @deep-twilight.bsky.social · 25/09/2025

Three galaxies, aurora, mountains and clouds A timelapse from a recent trip to Glenorchy, NZ - beautiful dark skies and plenty to look at, with clouds bubbling off the Humboldt Range, broken enough to see the southern lights below the Milky Way and Magellanic Clouds. EOS6Dii, 228 frames, 20s each

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Andy Casely @deep-twilight.bsky.social · 25/09/2025

A great summary of the start of the #wncl cricket season by @crystallised-cricket.com . Who will be the breakout stars of 2025-26? I'm looking forward to finding out!

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Andy Casely @deep-twilight.bsky.social · 24/09/2025

Two comets and Mars, 21st Sept C/2025 R2 (SWAN) is keeping pace with Mars, and fainter C/2025 K1 (ATLAS) is descending towards the Sun. Processing was interesting, correcting for three moving objects against the twilight starfield. Tonight, the Moon joins the party! EOS 6Dii, 35x1min, 300mm @ f/5.

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Reposted by Andy Casely

Zeke Hausfather @zekehausfather.com · 23/09/2025

In a UN speech today, President Trump said that "all of these [climate] predictions were wrong". Back in 2019 I led a research effort to digitize old climate model projections and assess how well they did. Turns out they got future warming pretty spot on!

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Andy Casely @deep-twilight.bsky.social · 13/09/2025

A Galactic frame of reference What's your point of view? Does the Milky Way set, or does the Earth just get in the way? Been wanting to do this one for a while! ~6hrs, 30s per frame, EOS6Dii, Star Adventurer, Sigma 14-24mm. Processed in PixInsight & PS. #astrophotography #timelapse

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Andy Casely @deep-twilight.bsky.social · 10/09/2025

I'm pretty sure (like a few others here) these are mammatus, with parts blown into streaks by strong winds towards the camera along the underside of the cumulonimbus anvil. They're in an odd perspective with the good mammatus structure far away and silhouetted against the brighter sky. Nice pic!

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Andy Casely @deep-twilight.bsky.social · 10/09/2025

Waxing Moon, 3rd Sept I was playing with camera focus and focal length points on the C14 - 585MM + focal reducer = 7 panel whole Moon mosaic, The full-size processed image is 90 megapixels. Hello, nearest neighbour! Full res view here: photos.app.goo.gl/J5pR2DJYiwrq...

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Andy Casely @deep-twilight.bsky.social · 30/08/2025

A dusty MIlky Way snap from a short break at Turon Gates, NSW. 29x90s, EOS 6Dii @24mm, Star Adventurer, good skies. Antares region is below centre. #astronomy #astrophotography

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Leigh Fletcher @leighfletcher.bsky.social · 24/06/2025

Peter Rosén has created another great animation of #Jupiter's storms during the 2024/25 apparition, made from thousands of amateur observations and projected in a variety of different ways. Incredible amount of work must have gone into this #planetsci [Credit: P. Rosén] youtu.be/x1W_Ux_jgaE?...

youtu.be

2 Huge Storms have erupted on Jupiter

YouTube video by Peter R

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Andy Casely @deep-twilight.bsky.social · 12/06/2025

You have been kidnapped and a character from the last tv show you watched is trying to rescue you. Who is coming to save you? Chances of survival... slim

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Lora Kolodny @lorak.bsky.social · 26/05/2025

“When the system forces you to code with a hallucinating clown, eventually you stop resisting. You let him type. You let him be "productive." You check out. You surrender your brain to the noise and just float.” deplet.ing/the-copilot-...

deplet.ing

The Copilot Delusion

Disclaimer: This post was written May 2025, and the arguments apply to AI code capabilities at this time. The arguments around lack of competence are certainly likely to become less prevalent-while th...

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Reposted by Andy Casely

David Slack @slack2thefuture.bsky.social · 26/05/2025

If your business model doesn’t work without breaking the law, then you’re not in business. You’re in organized crime.

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Andy Casely @deep-twilight.bsky.social · 26/05/2025

Dust storm this morning, everything a bit hazy. Our periodic reminder there's a lot of desert away out west!

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Andy Casely @deep-twilight.bsky.social · 09/05/2025

Images are red filter only, calibrated to be similar in brightness, moons labelled. The line across Saturn is the rings/silhouetted against the planet. F ring would normally be totally invisible, may be brightest part of the rings in images at/just before before equinox. Celestron C14, ZWO ASI585MM.

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Andy Casely @deep-twilight.bsky.social · 09/05/2025

Sunrise on Saturn's rings 3 images 3rd-8th May (UT) - rings reappearing through Saturn's equinox on the 6th. First image shows the Sun/Earth-facing outer edge only, likely basically the F ring! (brightest equinox ring in Cassini 2009 data) Last image has south face of the rings illuminated again.

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CosmicRami 🏳️‍🌈🏳️‍⚧️ @rami.spaceaustralia.com · 07/05/2025

If you like then you better put a ring on it! 🪐 @deep-twilight.bsky.social got a really nice pic of #Saturn during the time when it’s ring system is pretty much edge on to our perspective. And a couple of Moons! Really like the colour of the equatorial and higher latitude belts.

Edge on view of the planet Saturn. The rings appear as a thin black line that dissects the disc of the planet. The colours are hues of soft pink and grey-green

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Andy Casely @deep-twilight.bsky.social · 07/05/2025

Thanks Rami! Those colours are pretty but a nightmare, some of the belts appear actually slightly greenish (and did last year), but normally green isn't seen much in the sky - adjusting this image wasn't easy and i still don't think I have it right 😬

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Andy Casely @deep-twilight.bsky.social · 05/05/2025

Indeed - it is significantly easier to catch Mimas, and perhaps even fainter moons just now without the rings glare. It should also be easier throughout this opposition as the rings will be a bit fainter.

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Andy Casely @deep-twilight.bsky.social · 05/05/2025

Hidden rings, 3rd May You can see the rings in a longer-exposed, very heavily-stretched view! The ghostly rings are so faint just now that they are far outshone by 13.5mag Mimas (the fainter of the pair of moons on the left ansa). C14, ASI585MM, 6mins IR642nm. Sunrise on the rings is tomorrow...

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Andy Casely @deep-twilight.bsky.social · 05/05/2025

Saturn, five moons, no rings What a strange planet! Tomorrow is Saturn's equinox, a rare good look without its famous ring system, far too faint to see in a normally-exposed image, silhouetted against Saturn. Dione, Rhea, Mimas, Tethys and Enceladus too. C14, ASI585MM, 15mins, 3rd May 19:54UT.

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Andy Casely @deep-twilight.bsky.social · 03/05/2025

Saturn's hidden rings, 2nd May A snap of the dark side of Saturn's rings, only four days before Saturn's equinox. The silhouette of darkened rings cuts across the planet, and the full extent of the very faint rings themselves are in an overexposed and strongly stretched version. #astrophotography

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Andy Casely @deep-twilight.bsky.social · 18/04/2025

Thanks @astrobob67.bsky.social for using my recent dark-side Saturn imsges in his latest column for S&T! I had another imaging attempt this morning, and they were even less visible, also not visible in the eyepiece in fairly bright twilight. skyandtelescope.org/astronomy-bl...

skyandtelescope.org

See the Lyrid Meteor Shower the Night of April 21–22

The annual Lyrid meteor shower should put on a great show this year. Enjoy it with dashes of Venus and the "dark side" of Saturn's rings.

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Andy Casely @deep-twilight.bsky.social · 17/04/2025

That's brilliant, thank you Bob. Article looks good and informative too, I'm happy my pictures were useful to you!

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Emily Hunt @emily.space · 14/04/2025

screw it, let's give everyone a cluster! inspired by @aussiastronomer.bsky.social's exoplanet handouts, every reply to this post will get a Milky Way star cluster + associated cluster fact. I might struggle to keep up if this post gets >100 replies but I'll try!!

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Andy Casely @deep-twilight.bsky.social · 15/04/2025

Yes please! I'm a fan of interesting open clusters 🌟⭐️

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Andy Casely @deep-twilight.bsky.social · 15/04/2025

I did see them easily enough in 1995 visually with an 8" dob, (and guided by a really good S&T article about the multiple transitions between light and dark and ring crossings that year). This year the dark rings will be much harder!

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Andy Casely @deep-twilight.bsky.social · 15/04/2025

Good question! No, not at all, though i have some hope towards the last week of April or first week of May when Saturn will be higher in a darker sky. The stretch was large on the digital data, so they are very faint and will need a darker background

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