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
Related stories:
Cassini flyby of Saturn moon offers insight into solar system history
NASA's Cassini spacecraft is scheduled to fly within 16 miles of Saturn's moon Enceladus on Oct. 9 and measure molecules in its space environment that could give insight into the history of the solar system.
Cassini Images Ring Arcs Among Saturn's Moons
(PhysOrg.com) -- NASA's Cassini spacecraft has detected a faint, partial ring orbiting with one small moon of Saturn, and has confirmed the presence of another partial ring orbiting with a second moon. This is further evidence that most of the planet's small, inner moons orbit within partial or complete rings.
Cassini Pinpoints Source of Jets on Saturn's Moon Enceladus
(PhysOrg.com) -- In a feat of interplanetary sharpshooting, NASA's Cassini spacecraft has pinpointed precisely where the icy jets erupt from the surface of Saturn's geologically active moon Enceladus.
Planets Align for the 4th of July
News Flash: On 4th of July weekend, NASA forecasts lights in the sky. No, not those lights. Look beyond the fireworks. Almost halfway up the western sky, just above the twilight glow of sunset, a trio of worlds is gathering: Saturn, Mars and the crescent Moon.
Radio Telescopes to Keep Sharp Eye on Mars Lander
As NASA's Phoenix Mars Lander descends through the Red Planet's atmosphere toward its landing on May 25, its progress will be scrutinized by radio telescopes from the National Radio Astronomy Observatory (NRAO). At NRAO control rooms in Green Bank, West Virginia, and Socorro, New Mexico, scientists, engineers and technicians will be tracking the faint signal from the lander, 171 million miles from Earth.
Saturn images to be displayed in New York
The National Aeronautics and Space Administration says some of the best images from Saturn and the planet's rings and moons will be displayed in New York.
Mars radar opens up a planet’s third dimension
ESA’s Mars Express radar sounder, MARSIS, has looked beneath the martian surface and opened up the third dimension for planetary exploration. The technique’s success is prompting scientists to think of all the other places in the Solar System where they would like to use radar sounders.
NASA Extends Cassini's Grand Tour of Saturn
NASA is extending the international Cassini-Huygens mission by two years. The historic spacecraft's stunning discoveries and images have revolutionized our knowledge of Saturn and its moons.
