28.09.2026

On Oct. 4th, Saturn will be at opposition--directly opposite the sun in the sky. Opposition does something marvelous to Saturn's rings. It causes them to brighten dramatically.

The phenomenon is called "The Opposition Effect," and Maximilian-Vlad Teodorescu of Magurele, Romania, caught it in action:

"The animation is made out of two images, one from August 20, the other from September 19," explains Teodorescu. "The rings are clearly brightening ahead of next week's opposition."

Saturn's rings are made of countless chunks of ice, each casting a shadow on its neighbors. When the sun, Earth, and Saturn line up at opposition, every ice chunk hides its own shadow. Saturn's cloudy globe doesn't do this because it has no shadows to hide.

The Opposition Effect surges in the final days before opposition. In 2005, the Hubble Space Telescope found that Saturn's rings gained as much brightness in the last few days as they had in the previous few months. Much of that last-minute jump comes from sunlight bouncing straight back off the ice.

So get ready for a beautiful view. At opposition, Saturn rises at sunset and stays up all night long. The rings are an easy target for backyard telescopes.

Quelle: SpaceWeather.com