Categories: Saturn

Moonlet Tugs at Saturn’s Rings

This Cassini photograph shows the power Saturn’s tiniest moons have over its gossamer rings. This knot in Saturn’s F ring is caused by the gravitational influence of a tiny moon… or moons. Scientists believe there could be several tiny moonlets of various sizes perturbing the rings to create these knots. Cassini took this image on Sept. 25, 2006 when it was approximately 255,000 kilometers (159,000 miles) from Saturn.

The Cassini spacecraft has revealed a never-before-seen level of detail in Saturn’s F ring, including evidence for the perturbing effect of small moonlets orbiting in or close to the ring’s bright core.

For some time, scientists have suspected the presence of tiny moonlets that orbit Saturn in association with the clumpy and braided-looking ring. As the small satellites move close to the F ring core they leave a gravitational signature. In some cases they can draw out material in the form of a “streamer”–a miniature version of the interaction Cassini has witnessed between Prometheus and the F ring material. The dynamics of this interaction are the same, but the scale is different. See Passing Lane for a view of Prometheus creating a streamer.

Scientists speculate that there could be several small moons with a variety of sizes involved in the creation of structures like the one seen here.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Sept. 25, 2006 at a distance of approximately 255,000 kilometers (159,000 miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 29 degrees. Scale in the original image was 1 kilometer (3,873 feet) per pixel. The image has been magnified by a factor of two and contrast enhanced.

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA’s Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.

For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov . The Cassini imaging team homepage is at http://ciclops.org .

Original Source: NASA/JPL/SSI News Release

Fraser Cain

Fraser Cain is the publisher of Universe Today. He's also the co-host of Astronomy Cast with Dr. Pamela Gay. Here's a link to my Mastodon account.

Recent Posts

Quantum Correlations Could Solve the Black Hole Information Paradox

The black hole information paradox has puzzled physicists for decades. New research shows how quantum…

11 hours ago

M87 Releases a Rare and Powerful Outburts of Gamma-ray Radiation

In April 2019, the Event Horizon Telescope (EHT) collaboration made history when it released the first-ever…

15 hours ago

Astronomers Find a Black Hole Tipped Over on its Side

Almost every large galaxy has a supermassive black hole churning away at its core. In…

18 hours ago

NASA is Developing Solutions for Lunar Housekeeping’s Biggest Problem: Dust!

Through the Artemis Program, NASA will send the first astronauts to the Moon since the…

1 day ago

Where’s the Most Promising Place to Find Martian Life?

New research suggests that our best hopes for finding existing life on Mars isn’t on…

1 day ago

Can Entangled Particles Communicate Faster than Light?

Entanglement is perhaps one of the most confusing aspects of quantum mechanics. On its surface,…

2 days ago