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Janus (moon)
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Janus is an inner satellite of Saturn. It is named after the mythological Janus, the Roman god of beginnings. This natural satellite was first identified by Audouin Dollfus on December 15, 1966, altho
Janus as imaged by Cassini on 7 April 2010: highest-resolution full-disk image to date
Janus as imaged by Cassini on 7 April 2010: highest-resolution full-disk image to date
Epimetheus (lower left) and Janus (right) seen on 20 March 2006, two months after swapping orbits. The two moons appear close only because of foreshor
Epimetheus (lower left) and Janus (right) seen on 20 March 2006, two months after swapping orbits. The two moons appear close only because of foreshortening; in reality, Janus is about 40,000 km farther from Cassini than Epimetheus.
Janus as viewed by Voyager 2 (1981-08-25).
Janus as viewed by Voyager 2 (1981-08-25).
Janus and Prometheus lie above and below Saturn's rings (2006-04-29).
Janus and Prometheus lie above and below Saturn's rings (2006-04-29).
Rings of Saturn
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Saturn has the most extensive and complex ring system of any planet in the Solar System. The rings consist of particles in orbit around the planet, ranging from micrometers to meters in size, and are
Janus (moon)
…which then form a diffuse ring around their orbital paths. Along with Epimetheus, Janus acts as a shepherd moon, maintaining the sharp outer edge of the A Ring in a 7:6 orbital resonance. The effect is more obvious when the more massive Janus is on the resonant (inner) orbit. El Moutamid, M.; et al. (1 October…
The full set of rings, imaged on 19 July 2013, as Saturn eclipses the Sun from the vantage of the Cassini orbiter, which is 1.2 million kilometres (0.
The full set of rings, imaged on 19 July 2013, as Saturn eclipses the Sun from the vantage of the Cassini orbiter, which is 1.2 million kilometres (0.75 million miles) from Saturn. Earth appears as a dot at 5 o'clock, between the G and E rings – with its brightness artificially exaggerated in this photograph.
Huygens' ring hypothesis in Systema Saturnium (1659)
Huygens' ring hypothesis in Systema Saturnium (1659)
Simulated image using color to present radio-occultation-derived particle size data. The attenuation of 0.94-, 3.6-, and 13-cm signals sent by Cassini
Simulated image using color to present radio-occultation-derived particle size data. The attenuation of 0.94-, 3.6-, and 13-cm signals sent by Cassini through the rings to Earth shows abundance of particles of sizes similar to or larger than those wavelengths. Purple (B, inner A Ring) means few particles are < 5 cm (all signals similarly attenuated). Green and blue (C, outer A Ring) mean particles < 5 cm and < 1 cm, respectively, are common. White areas (B Ring) are too dense to transmit adequate signal. Other evidence shows rings A to C have a broad range of particle sizes, up to m across.
Cassini space probe view of the unilluminated side of Saturn's rings (October 10, 2013).
Cassini space probe view of the unilluminated side of Saturn's rings (October 10, 2013).