See a table of Saturn's known satellites .
Three New Outer Satellites of Saturn Discovered
Circular No. 8836 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION S/2007 S 1, S/2007 S 2, AND S/2007 S 3 Further to IAUC 8727, S. S. Sheppard, D. C. Jewitt, and J. Kleyna have reported the discovery of three new satellites of Saturn in data obtained earlier this year with the Subaru 8.2-m reflector at Mauna Kea, aided by B. G. Marsden's ongoing linkages and search ephemerides. The astrometry and orbital data appear on MPECs 2007-G38 and 2007-J09, showing orbital periods of 895, 793, and 992 days for S/2007 S 1, S/2007 S 2, and S/2007 S 3, respectively; the latter two objects have retrograde orbits. (C) Copyright 2007 CBAT 2007 May 11 (8836) Daniel W. E. Green
One New Inner Satellite of Saturn find by the Cassini Spacecraft
Circular No. 8857 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION S/2007 S 4 C. C. Porco, CICLOPS, Space Science Institute, Boulder; and the Cassini Imaging Science Team report the discovery of S/2007 S 4, a satellite orbiting in the region between Saturn XXXII (Methone) and Saturn XXXIII (Pallene). The satellite was first discovered in a series of fifteen pairs of Cassini wide-angle camera images with exposure times of 10 and 15 s, taken through the clear filter on 2007 May 30, spanning 6 hr. Following a preliminary orbit fit, an exhaustive search of other Cassini images generated a number of additional detections. The current observation arc, comprising 47 detections, spans 3.03 years between June 2004 and June 2007. Numerical integration of the equations of motion shows that the object is being influenced by a 10:11 mean-motion resonance with Mimas. A precessing-ellipse model fitted to the integrated orbit for S/2007 S 4 over the month of May 2007 yields a = 197700 km, e = 0.001, i = 0.1 deg, and P = 1.03650 days. S/2007 S 4 is located approximately 3400 km beyond Saturn XXXII, but still interior to the orbit of Saturn XXXIII, suggesting that the three may be part of a larger group of satellites in this region. Saturn XXXIII was also observed in some of the S/2007 S 4 discovery frames. If S/2007 S 4 has the same disk-integrated reflectivity as Saturn XXXIII, preliminary estimates suggest a physical radius for S/2007 S 4 of about 1 km. (C) Copyright 2007 CBAT 2007 July 18 (8857) Daniel W. E. Green
For more information about satellites in our Solar System visit The satellites page.