Recent observations discovered by NASA’s Hubble Space Telescope revealed a giant, evolving, 10-sided atmospheric wave encircling Saturn’s South Pole, according to an announcement published in the journal Science Advances. Positioned within one of Saturn’s robust jet streams, this decagon formation represents the initial observation of a large, symmetrically sided jet pattern anywhere in Saturn’s Southern Hemisphere.
How Astronomers Discovered Saturn’s Southern Decagon
As Saturn’s seasonal shifts gradually brought the South Pole back into Earth’s line of sight, astronomers first spotted the formation by jointly reviewing Saturn images gathered from ground-based observatories, according to NASA. NASA noted that researchers subsequently utilized the Hubble Space Telescope, whose vantage point above Earth provided superior image clarity and spatial resolution throughout a full rotation of Saturn, free from atmospheric blurring.
By compiling Hubble images going back to 2023, investigators spotted faint indicators that the structure was starting to take shape prior to becoming a distinct configuration. Information provided by NASA’s Cassini spacecraft—which orbited Saturn from 2004 to 2017—likewise displayed no signs of a long-standing structure.
Did you know? According to NASA, these findings were gathered as part of the Hubble Outer Planet Atmospheres Legacy (OPAL) initiative, which has captured imagery of the outer planets annually for over a decade.
Comparing Saturn’s Poles: The Northern Hexagon Versus the Southern Decagon
The newly found 10-sided wave shares similarities with Saturn’s famous hexagon in Saturn’s Northern Hemisphere, which has been there every time we’ve looked for more than 40 years. However, it’s different enough for them to believe that they are witnessing a new phenomenon in the atmosphere, as it appears to be strengthening.
| Feature | Northern Hexagon | Southern Decagon |
|---|---|---|
| Sides | 6 sides (Hexagon) | 10 sides (Decagon) |
| Duration | Observed consistently for over 40 years | Confirmed back to 2023 |
| Structure | Vertically extended atmospheric structure | Vertically extended atmospheric structure |
“We’ve never seen anything quite like this in Saturn’s Southern Hemisphere,” Amy Simon, study co-author and OPAL principal investigator, NASA’s Goddard Space Flight Center in Greenbelt, Maryland, said.
Agustín Sánchez-Lavega, lead author of the new study, noted the historical quest for the feature. “Given Saturn’s symmetry in its north-south jet stream system, we have been searching for a counterpart to Saturn’s northern hexagon on the South Pole in Hubble images since 1990,” Sánchez-Lavega said.
Future Observations Using Hubble and Webb Telescopes
Spanning multiple atmospheric strata, the wave demonstrates that it is not merely restricted to cloud level, but instead functions as a vertically deep atmospheric phenomenon. Investigators suspect that the wave developed fairly recently, though determining its exact origin point will necessitate further investigation utilizing Hubble along with NASA’s James Webb Space Telescope, alongside computer simulation evaluations.
Frequently Asked Questions About Saturn’s Decagon
What is Saturn’s southern decagon?
It is a giant, evolving, 10-sided atmospheric wave encircling Saturn’s South Pole.
Is the decagon the same as Saturn’s northern hexagon?
No. While researchers noted it bears a strong resemblance to the well-known northern hemisphere hexagon, distinct differences lead them to conclude they are observing a brand-new atmospheric occurrence.
When was the southern decagon discovered?
Recent observations discovered by NASA’s Hubble Space Telescope revealed it, with Hubble data confirming the feature’s presence back to 2023 after ground-based astronomers first identified it.
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