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TOPIC: 60 Saturn moons
Blobrana


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S/2007 S 4
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VIDEO
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Sixty for Saturn


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.



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Blobrana


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Posts: 131433
Date:
2007 S4
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The 60th moon of Saturn reveals itself in a sequence of images. The discovery suggests that the new moon, along with its neighbours 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.
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Blobrana


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60 Saturn moons
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60th Moon of Saturn Discovered
The newfound moon orbits about 1.76 kilometres from Saturn

s2007_s4_e1
Image 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.

"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!" - Professor Keith Mason, CEO of the UK's Science and Technology Facilities Council (STFC).

Affectionately known as Frank to the QMUL 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.

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Blobrana


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S/2007 S4
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S/2007 S 4

S/ 2007 S 4 is a very small natural satellite of Saturn lying between the orbits of Mimas and Enceladus.
It was first seen by the Cassini Imaging Team[1] on May 30, 2007. Once the discovery was made, a search of older Cassini images revealed this small satellite in observations from as far back as June 2004.

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Blobrana


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Tethys and Dione
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Saturns moons Tethys and Dione are flinging great streams of particles into space, according to data from the NASA/ESA/ASI Cassini mission to Saturn. The discovery suggests the possibility of some sort of geological activity, perhaps even volcanic, on these icy worlds.
 The particles were traced to the two moons because of the dramatic movement of electrically charged gas in the magnetic environs of Saturn. Known as plasma, the gas is composed of negatively charged electrons and positively charged ions, which are atoms with one or more electrons missing. Because they are charged, the electrons and ions can get trapped inside a magnetic field.
Saturn rotates around itself in just 10 hours and 46 minutes. This sweeps the magnetic field and the trapped plasma through space. Just like a child on a fast-spinning merry-go-round, the trapped gas feels a force trying to throw it outwards, away from the centre of rotation.

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Blobrana


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Saturn moons
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S/2007 S1, S/2007 S2, AND S/2007 S3

IAUC 8836 

Name         a         i       e       Peri    Node    M        Period  mag    H      Size Year
            (km)     (deg)             (deg)   (deg)   (deg)    (days)        (mag)   (km)
 S/2007 S1  17920000   49.86   0.107   00.00   000.0   000.0    895     23.9          7    2007 
 S/2007 S2  16560000   176.7   0.218   00.00   000.0   000.0    800     24.4          6    2007 
 S/2007 S3  20518500   177.2   0.130   00.00   000.0   000.0    1100    24.9          5    2007


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Blobrana


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Saturnian satellites
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Thirteen names for the Saturnian satellites (Aegir, Bebhionn, Bergelmir, Bestla, Farbauti, Fenrir, Fornjot, Hati, Hyrokkin, Kari, Loge, Skoll, and Surtur)  have been approved by the IAU WGPSN.

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Blobrana


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9 New Saturn moons
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                a       i       e     Peri     Node    M      Period   mag   size          
S/2004 S19 18217125   153.3   0.360   00.00   000.0   000.0    912     23.5    8
S/2006 S1  18981135   154.2   0.130   00.00   000.0   000.0    970     24.6    6
S/2006 S2  22350000   148.4   0.341   00.00   000.0   000.0    1245    23.9    7
S/2006 S3  21132000   150.8   0.471   00.00   000.0   000.0    1142    24.6    6
S/2006 S4  18105000   172.7   0.374   00.00   000.0   000.0    905     24.4    6
S/2006 S5  23190000   166.5   0.139   00.00   000.0   000.0    1314    24.6    6
S/2006 S6  18600000   162.9   0.192   00.00   000.0   000.0    942     24.7    6
S/2006 S7  22290000   166.9   0.368   00.00   000.0   000.0    1237    24.8    6
S/2006 S8  17610000   155.6   0.418   00.00   000.0   000.0    869     24.5    6


-- Edited by Blobrana at 09:17, 2006-07-15

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Blobrana


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S/2004 S19
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The other new moon found is S/2004 S 19

(there were only 8 listed in the last post)

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Blobrana


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Date:
56 Saturn moons
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The Minor Planet Centre has listed nine (8 listed) more outer moons for Saturn.
They are all in retrograde orbits, with orbital periods of two to three years. S/2006 S1 to S/2006 S8 moons, were discovered with the eight meter Subaru telescope in Hawaii, by David Jewitt and company.

This brings the total count to 56 Saturnian moons

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