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A satellite with an orbital inclination between zero and ninety degrees is said to be in what is called a direct or prograde orbit, meaning that it orbits in the same direction as the planet's rotation. A satellite with an orbital inclination between 90° and 180° (or, equivalently, between 0° and −90°) is said to be in a retrograde orbit.
Prograde satellites of Uranus orbit in the direction Uranus rotates, which is retrograde to the Sun. Nearly all regular satellites are tidally locked and thus have prograde rotation. Retrograde satellites are generally small and distant from their planets, except Neptune's satellite Triton, which is large and close. All retrograde satellites ...
The satellites with inclinations below 90° are prograde, those above 90° are retrograde. The X-axis is labeled in terms of Saturn's Hill radius. The prograde Inuit and Gallic groups and the retrograde Norse group are identified. Animation of Saturn's Inuit group of satellites from 2018–2027
The Himalia group is a group of prograde irregular satellites of Jupiter that follow similar orbits to Himalia and are thought to have a common origin. [ 1 ] The known members of the group are (in order of increasing distance from Jupiter):
S/2002 N 5 is a prograde irregular satellite of Neptune.It was discovered on 14 August 2002 by Matthew Holman, John J. Kavelaars, Tommy Grav, and Wesley Fraser using the 4.0-meter Víctor M. Blanco Telescope at Cerro Tololo Observatory, Chile, but it became lost and was not observed again until Scott S. Sheppard rediscovered it on 3 September 2021.
Leda / ˈ l iː d ə /, also known as Jupiter XIII, is a prograde irregular satellite of Jupiter.It was discovered by Charles T. Kowal at the Mount Palomar Observatory on September 14, 1974, after three nights' worth of photographic plates had been taken (September 11 through 13; Leda appears on all of them).
Erriapus / ɛr i ˈ æ p ə s /, or Saturn XXVIII (28), is a prograde irregular satellite of Saturn.It was discovered by Brett Gladman, John J. Kavelaars and colleagues in 2000, and given the temporary designation S/2000 S 10.
The prograde satellites consist of the Himalia group and three others in groups of one. The retrograde moons are grouped into the Carme, Ananke and Pasiphae groups. Saturn has 146 moons with known orbits; 66 of them have received permanent designations, and 63 have been named. Most of them are quite small.