A new moon for Saturn – a family affair

Jul 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: Spacewalking astronauts finish extensive, trick cable job

add to favorites email to friend print save as pdf

Related Stories

Korean tech start-ups offer life beyond Samsung

Feb 23, 2015

As an engineering major at Seoul's Yonsei University, Yoon Ja-Young was perfectly poised to follow the secure, lucrative and socially prized career path long-favoured by South Korea's elite graduates.

Fresh nuclear leak detected at Fukushima plant

Feb 22, 2015

Sensors at the Fukushima nuclear plant have detected a fresh leak of highly radioactive water to the sea, the plant's operator announced Sunday, highlighting difficulties in decommissioning the crippled plant.

Spacewalking astronauts route cable in 1st of 3 jobs

Feb 22, 2015

(AP)—Spacewalking astronauts routed more than 300 feet (90 meters) of cable outside the International Space Station on Saturday, tricky and tiring advance work for the arrival of new American-made crew ...

Recommended for you

Spacewalking astronauts finish extensive, trick cable job

10 hours ago

(AP)—Spacewalking astronauts successfully completed a three-day cable job outside the International Space Station on Sunday, routing several-hundred feet of power and data lines for new crew capsules commissioned ...

Study of atmospheric 'froth' may help GPS communications

Feb 27, 2015

When you don't know how to get to an unfamiliar place, you probably rely on a smart phone or other device with a Global Positioning System (GPS) module for guidance. You may not realize that, especially at ...

User comments : 0

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.