Author | Lightnews

Reposted by Björn Jónsson

cira-csu.bsky.social @cira-csu.bsky.social · 6d

Moving clouds slowly reveal sea ice twisting and turning hypnotically off the east coast of Greenland.

Reposted by Björn Jónsson

Andrea Luck @andrealuck.bsky.social · 16d

Fresh JWST view of Uranus taken Oct 6 2025 with NIRCam.

Full size & more info: flic.kr/p/2rByidu 🔭🧪
Credit: NASA/ESA/CSA/STScI/Andrea Luck CC BY

Proposal PI: Varun Bajaj
Proposal ID: 8975
Filters: F150W2-F162M, F410M

Image of Uranus taken by the James Webb Space Telescope, showing a whitish north polar region, vivid blue-greenish atmosphere and a few whitish elongated storms visible around the pole. The planet is surrounded by clearly defined ring system set against the black background of space.

10 120 350

Reposted by Björn Jónsson

Dakota Smith @weatherdak.bsky.social · 13d

Alrighty, ready to see something really cool? (and maybe a little nauseating)

The evolution of Hurricane Melissa's mesovortices at peak strength.

37 310 870

Reposted by Björn Jónsson

Andrea Luck @andrealuck.bsky.social · 10d

1/3 You might’ve seen last week’s newly released JWST data of Planetary Nebula NGC2440, here’s my take on it 😵

Full size 4K image and more info in this thread 🧵 🔭🧪

Credit: NASA/ESA/CSA/STScI/j. Roger/Andrea Luck CC BY

6 69 250

Reposted by Björn Jónsson

Landru79 @landru79.bsky.social · 8d

CASSINI #SATURN MISSION

Planet: #Saturn
Start time: 2013-05-08
Instr.: #UVIS
Activity name: AURSTARE

t.me/landru79/838

NASA/JPL/j. ROGER

3 8 37

Reposted by Björn Jónsson

Ted Stryk @tedstryk.bsky.social · 10d

Another closeup of Saturn from Voyager 2 on August 21, 1981. This one shows a closer view of one of an eddy.

A large eddy can be seen to the upper right.

3 14

Reposted by Björn Jónsson

Melina Thévenot🏳️‍⚧️ @melina-iras07572.bsky.social · Oct 9

Planet #Uranus 🪐 and inner moons with #JWST NIRCam 🔭 #planetsci Observation from this Monday (lol moon🌕day).

Filters: F150W2; F162M
Date: 2025-10-06 between 02:15:43 UT and 04:46:47 UT

Program: www.stsci.edu/jwst-program...

Uranus with rings and small elongated dots (tracks) around it.

1 24 93

Reposted by Björn Jónsson

Gordan Ugarković @ugordan.bsky.social · Sep 20

A distant shot of Saturn's system while Cassini was still was on its way. This was taken after they had resolved the condensation residue issue on the ISSNA optics by heating it, and still almost 2 years before Saturn arrival. Magnified 2x from original pixel scale.

Taken on 2002-10-21 14:43 UTC

1 7 28

Reposted by Björn Jónsson

Ted Stryk @tedstryk.bsky.social · Sep 18

A more distant shot of Io, moon of Jupiter, showing Loki Patera, the dark feature in the upper center, from Juno as it receded from Io on December 30th, 2023.

9 60

Reposted by Björn Jónsson

Daniel Machacek @danielmachacek.bsky.social · Sep 14

A few selected images of Mars processed from a new batch of data from the EXI camera aboard the Hope probe.
The dates and times of the images and some details are in the ALT text.

Global color image of Mars from Hope Probe with north polar ice cap visible on the top of the image, Valles Marineris on the left and lots of clouds over Meridiani Planum on the right.
Date: December 21, 2024. 14:46 UTC.
Credit: Emirates Mars Mission (EMM)/EXI/D. Machacek.

Global color image of Mars from Hope Probe with north polar ice cap visible on the top of the image, Olympus Mons near the center, bright cloud over Alba Mons on the right near terminator and fan shaped clouds around Arsia Mons in the lower center.
Date: December 5, 2024. 13:07 UTC.
Credit: Emirates Mars Mission (EMM)/EXI/D. Machacek.

Global color image of Mars from Hope Probe with north polar ice cap visible on the top of the image, Gale crater (landing place of Curiosity rover) near the center and interesting cloud between Elysium Mons and Albor Tholus near terminator.
Date: November 28, 2024. 15:20 UTC.
Credit: Emirates Mars Mission (EMM)/EXI/D. Machacek.

Color image of crescent Mars from Hope Probe with south polar ice cap visible at the bottom of the image, the giant Tharsis volcanoes near the center, Noctis Labyrinthus in the center right near terminator and Olympus Mons volcano at the upper left of the image.
Date: February 6, 2025. 04:04 UTC.
Credit: Emirates Mars Mission (EMM)/EXI/D. Machacek.

8 56 250

Björn Jónsson @bjornjonsson.bsky.social · Sep 15

I recently improved the color of my Voyager 1 map of Jupiter that I created in 2022. The main improvement is better synthetic green data (the original data doesn't include green).
Below are small previews of the old and new version of the map. The map is available here: bjj.mmedia.is/data/jupiter...

1 3 18

Reposted by Björn Jónsson

Simeon Schmauß @stim3on.bsky.social · Sep 13

The sun was just 10 degrees above the horizon when NASA's Perseverance rover captured this morning view of Nili Planum yesterday. The rim of Jezero crater is casting a long shadow over the rover and foreground landscape. 🔭

Full res: flic.kr/p/2rt54pJ

Credit: NASA/JPL-Caltech/Simeon Schmauß

The morning sun shines it's first rays over the Nili Planum region on Mars revealing small hills with sand ripples in between. The wall of Jezero crater behind the camera casts a long shadow that stretches over the foreground and the rover itself.

2 49 170

Björn Jónsson @bjornjonsson.bsky.social · Sep 13

@askaniy.bsky.social I don't remember the details since I wrote the code a long time ago and parts of it are based on code I found somewhere. But this is from comments in the code: "ML_XYZtoRGB; D50/2 white point". So the conversion seems to be via CIE XYS space.

1

Björn Jónsson @bjornjonsson.bsky.social · Sep 3

(4/4) In the improved images I also used a better method to combine the color channels to get an RGB image. Instead of 'channel mixing' to get synthetic red & blue I used Jupiter's visible light spectrum to estimate the spectrum at each point in the map and then computed RGB color from the spectrum.

1 5

Björn Jónsson @bjornjonsson.bsky.social · Sep 3

(3/4) Compared to real green images, the green error drops down to ~25% of the error one gets when using the simpler weighted average - a major improvement. Color variations are more pronounced in the improved versions. In particular, variations in the strength of the red colors are more obvious.

1 4

Björn Jónsson @bjornjonsson.bsky.social · Sep 3

(2/4) Because there is no green data, synthetic green images must be generated. Typically a weighted average of orange and violet has been used but in the improved version of the map I used a much better (and more sophisticated) way to generate synthetic green data.

1 1 3

Björn Jónsson @bjornjonsson.bsky.social · Sep 3

(1/4) Test renders of Jupiter using my Voyager 1 global map (first image) and a version of the map with improved color (second image). Versions with and without enhanced contrast/colors are shown. The raw source data consists of orange and violet filtered images only.

1 6 34

Björn Jónsson @bjornjonsson.bsky.social · Sep 3

(4/4) In the improved images I also used a better method to combine the color channels to get an RGB image. Instead of 'channel mixing' to get synthetic red & blue I used Jupiter's visible light spectrum to estimate the spectrum at each point in the map and then computed RGB color from the spectrum.

Björn Jónsson @bjornjonsson.bsky.social · Sep 3

(3/4) Compared to real green images, the green error drops down to ~25% of the error one gets when using the simpler weighted average - a major improvement. Color variations are more pronounced in the improved versions. In particular, variations in the strength of the red colors are more obvious.

1

Björn Jónsson @bjornjonsson.bsky.social · Sep 3

(2/4) Because there is no green data, synthetic green images must be generated. Typically a weighted average of orange and violet has been used but in the improved version of the map I used a much better (and more sophisticated) way to generate synthetic green data.

1

Reposted by Björn Jónsson

⭐ ᗰᗩᖇᛕ ᗩ. ǤᗩᖇᒪIᑕᛕ ⭐ @markgarlick.com · Sep 3

NASA released some shape models of four of Saturn's moons. These have every lump and bump; they're not simple spheres.

Here's a test render I did in #Blender showing #Mimas in false color - red is high, blue low. Clearly shows how non-spherical it is!

#sciart #spaceart

1/2

5 34 130

Reposted by Björn Jónsson

Melina Thévenot🏳️‍⚧️ @melina-iras07572.bsky.social · Aug 30

#Hubble 🛰️🔭 images of #Saturn from yesterday, a 🧵

From proposal 17843 (PI: Amy Simon) archive.stsci.edu/proposal_sea...

First image with Filters F225W, F467M, F763M Observing start Time 20:24:08 to 20:28:15

Saturn with a yellow ring and blue to pink color for the planet with horizontal bands.

2 17 56

Reposted by Björn Jónsson

Ted Stryk @tedstryk.bsky.social · Sep 2

Today in 1979, Pioneer 11 was speeding away from Saturn, giving humanity a perspective from beyond the planet that it had never have. However, Saturn was also close to solar conjunction, which led to it being increasingly hard to transmit data. The right hand version shows how bad the dropouts were.

A scan of a raw image (not geometrically corrected) showing image dropouts. Unfortunately, I only have this scan of it, not the actual raw dataset.

2 7 20

Reposted by Björn Jónsson

Ted Stryk @tedstryk.bsky.social · Sep 1

Today in 1979, Pioneer 11 passed Saturn, viewing the night side of the rings, giving humanity its first encounter with the planet and its moons. It would be followed by Voyager 1 in 1980 and Voyager 2 in 1981.

26 88

Reposted by Björn Jónsson

Ted Stryk @tedstryk.bsky.social · Aug 26

OTD 1989, Voyager 2 was speeding off into space after passing by Neptune. It couldn't take motion compensated pictures during departure because it didn't have enough memory to store the commands. That's why there aren't spectacular closeups of Triton on the way out (the closeup here is underexposed)

A crescent Triton passing behind a crescent Neptune.

A thin crescent Triton. Two plumes, trailing off through the atmosphere, can be seen in the center.

The south polar terrain of Triton under low sun.

12 27