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RE: Neptune
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Neptune's Orbit Eccentricity Precession, Last Million Years

[youtube=http://youtube.com/watch?v=01Obge1dozA]

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Neptune's Orbit Inclination Precession, Last Million Years

[youtube=http://youtube.com/watch?v=f3Pdxe0M4jg]

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uranusneptunechart

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2005 TN53
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2005 TN53 is a possible Trojan asteroid of Neptune which was discovered by Scott S. Sheppard and Chadwick A. Trujillo in 2005. It has the same orbital period as Neptune and orbits at the L4 Lagrangian point about 60 degrees ahead of Neptune.

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Neptune's 4 outermost unnamed satellites have now been given official names by the IAU.

S/ 2002 N 1 has been named Halimede
 S/ 2002 N 2 has been  named  Sao
 S/ 2002 N 3 has been  named Laomedeia
S/ 2002 N 4  has been  named Neso.



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Neptune Ocean
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Even though Neptune abounds with water, no ocean exists beneath its blue-green clouds, say planetary scientists in California. Nevertheless, Neptune may develop an ocean in the far future--after the Sun dies.

Neptune, the eighth planet from the Sun, is named for the god of the sea. The planet is a giant but not a gas giant: whereas the solar system's two gas giants, Jupiter and Saturn, consist mostly of hydrogen and helium, Neptune and its twin Uranus consist mostly of water ice and rock.

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Neptune Trojans
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A Thick Cloud of Neptune Trojans and Their Colours
The dynamical and physical properties of asteroids offer one of the few constraints on the formation, evolution and migration of the giant planets. Trojan asteroids share a planet's semi-major axis but lead or follow it by about 60 degrees near the two triangular Lagrangian points of gravitational equilibrium. Here we report the discovery of a high inclination Neptune Trojan, 2005 TN53. This demonstrates that the Neptune Trojan population occupies a thick disk which is indicative of ``freeze-in'' capture instead of in-situ or collisional formation. The Neptune Trojans appear to have a population several times larger than the Jupiter Trojans. Our colour measurements show that Neptune Trojans have statistically indistinguishable slightly red colours suggesting they had a common formation and evolutionary history and are distinct from the classical Kuiper Belt objects.

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The Neptune Trojans,
2001 QR322, 2004 UP10, 2005 TN53, 2005 TO74, are all in the L4 cloud.

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The recently discovered Neptune Trojans are only the fourth stable group of asteroids observed around the Sun. The others are the Kuiper Belt just beyond Neptune, the Jupiter Trojans, and the main asteroid belt between Mars and Jupiter. Evidence suggests that the Neptune Trojans are more numerous than either the asteroids in the main belt or the Jupiter Trojans, but they are hard to observe because they are so far away from the Sun. Astronomers therefore require the largest telescopes in the world equipped with sensitive digital cameras to detect them.

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Astronomers announced today the discovery of three previously unseen Trojan moons orbiting with Neptune.

The three new objects are locked into roughly the same orbit as Neptune, called "Trojan" asteroids, have been found by researchers from the Carnegie Institution's Department of Terrestrial Magnetism (DTM) and the Gemini Observatory in Hilo, Hawaii. The discovery offers evidence that Neptune, much like its big cousin Jupiter, hosts thick clouds of Trojans in its orbit, and that these asteroids probably share a common source. It also brings the total of known Neptune Trojans to four.

http://www.dtm.ciw.edu/sheppard/trojans/

List Of Neptune Trojans

-- Edited by Blobrana at 22:02, 2006-06-15

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