A new moon for Saturn – a family affair

July 19, 2007
A new moon for Saturn – a family affair
The 60th moon of Saturn reveals itself in a sequence of images. The discovery suggests that the new moon, along with its neighbors Methone and Pallene (discovered by the Cassini imaging team in 2004), may form part of a larger group of moons in this region. The movie spans six hours. Initial calculations show the moon to have a width of approximately 2 kilometers (1.2 miles), with an orbit that lies between those of the moons Methone and Pallene. The moon's orbit is in resonance with another moon, Mimas, also seen in this sequence as a very bright, moving object. The new moon's location is indicated by a red box. Credit: NASA/JPL/Space Science Institute

Scientists from the NASA/ESA/ASI Cassini mission have announced the discovery of a new moon orbiting Saturn, bringing the total number of known moons in the Saturnian system to 60.

This latest satellite was first detected by Professor Carl Murray, a Cassini Imaging Team scientist from Queen Mary’s Astronomy Unit. It was found in a series of images taken from the wide-angle camera onboard Cassini on 30 May 2007.

Initial calculations, which show the moon to be only approximately 2 km (1 mile) wide, indicate that the orbit of the moon lies between those of two other Saturnian moons, Methone and Pallene (also discovered by the Cassini Imaging Team in 2004).

Professor Murray takes up the story: “The Saturnian system continues to amaze and intrigue us with many hidden treasures being discovered the more closely we look. After initially detecting this extremely faint object, we carried out an exhaustive search of all Cassini images to date and were able to find further detections.

“The latest discovery suggests that the three satellites may form part of a family of moons in this region. Naturally we are going to use Cassini’s cameras to search for additional family members.”

Professor Murray was also the first person to detect another moon of Saturn, Polydeuces, seen in Cassini images in October 2004. However, he is keen to emphasise the collaborative nature of this work. “Finding new moons and working out their orbits is a group effort. The credit for both of these discoveries should go to the entire Cassini Imaging Team.”

The closest approach to the satellite to date was on 28 June 2007 when Cassini passed at a distance of 32,000 km. Scientists hope to be able to get a closer look at the newly identified moon later in the mission.

Affectionately known as “Frank” to the Queen Mary scientists that first identified it, the satellite is set to have a more fitting name assigned to it – akin to its ‘cousins’ Methone and Pallene - who are named after the Greek Alkyonides. This is a decision for the International Astronomical Union (IAU) – the body responsible for officially naming planetary objects. So far only 48 of the 60 moons discovered have been given names. ‘Frank’ has received the preliminary designation S/2007 S 4 by the IAU. See notes to editors for further details about the naming of moons.

Professor Keith Mason, CEO of the UK’s Science and Technology Facilities Council (STFC) commented: “It is amazing to think that when Cassini embarked upon its epic journey to Saturn in 1997, we only knew about 18 of its moons. Since then, through observations from ground based telescopes and the Cassini spacecraft, a further 42 have been identified!”

Source: Queen Mary, University of London

Explore further: 35 years on, Voyager's legacy continues at Saturn

Related Stories

35 years on, Voyager's legacy continues at Saturn

August 25, 2016

Saturn, with its alluring rings and numerous moons, has long fascinated stargazers and scientists. After an initial flyby of Pioneer 11 in 1979, humanity got a second, much closer look at this complex planetary system in ...

Cassini finds flooded canyons on Titan

August 10, 2016

NASA's Cassini spacecraft has found deep, steep-sided canyons on Saturn's moon Titan that are flooded with liquid hydrocarbons. The finding represents the first direct evidence of the presence of liquid-filled channels on ...

Image: Dione's contrasts

August 23, 2016

Dione reveals its past via contrasts in this view from NASA's Cassini spacecraft. The features visible here are a mixture of tectonics—the bright, linear features—and impact cratering—the round features, which are spread ...

Image: Saturn's moons Tethys and Hyperion

August 16, 2016

Saturn's moons Tethys and Hyperion appear to be near neighbors in this Cassini view, even though they are actually 930,000 miles (1.5 million kilometers) apart here. Tethys is the larger body on the left.

New visualization of waves in Saturn's rings

August 22, 2016

Fans of astronomy are no doubt familiar with the work of Kevin Gill. In the past, he has brought us visualizations of what the Earth would look like if it had a system of rings, what a "Living Mars" would look like – i.e. ...

Recommended for you

The rise and fall of galaxy formation

August 30, 2016

An international team of astronomers, including Carnegie's Eric Persson, has charted the rise and fall of galaxies over 90 percent of cosmic history. Their work, which includes some of the most sensitive astronomical measurements ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.