Neptune's Story

@article{Goldreich1989NeptunesS,
  title={Neptune's Story},
  author={Peter Goldreich and Norman W. Murray and Pierre-Yves Longaretti and D Banfield},
  journal={Science},
  year={1989},
  volume={245},
  pages={500 - 504}
}
It is conjectured that Triton was captured from a heliocentric orbit as the result of a collision with what was then one of Neptune's regular satellites. The immediate post-capture orbit was highly eccentric with a semimajor axis a ∼ 103RN and a periapse distance rp that oscillated periodically above a minimum value of about 5RN. Dissipation due to tides raised by Neptune in Triton caused Triton's orbit to evolve to its present state in ≲109 years. For much of this time Triton was almost… Expand

Topics from this paper

A dynamical history of the inner Neptunian satellites
Abstract We examine a scenario involving the capture origin of Triton and infer the probable dynamical history of the Neptune satellite system. Triton's highly elongated postcapture orbit forcedExpand
Neptune's capture of its moon Triton in a binary–planet gravitational encounter
TLDR
It is reported that a three-body gravitational encounter between a binary system (of ∼103-kilometre-sized bodies) and Neptune is a far more likely explanation for Triton's capture. Expand
TRITON'S EVOLUTION WITH A PRIMORDIAL NEPTUNIAN SATELLITE SYSTEM.
TLDR
Triton's interaction with a prior satellite system may offer a mechanism to decrease its high initial semimajor axis fast enough to preserve small irregular satellites (Nereid-like), that might otherwise be lost during a prolonged Triton circularization via tides alone. Expand
The Origin of Neptune’s Unusual Satellites from a Planetary Encounter
The Neptunian satellite system is unusual, comprising Triton, a large ($\sim2700$ km) moon on a close-in, circular, yet retrograde orbit, flanked by Nereid, the largest irregular satellite ($\sim$300Expand
Discovery of five irregular moons of Neptune
TLDR
The discovery of five exceedingly faint moons of Neptune, two with prograde and three with retrograde orbits, which were presumably captured by Neptune. Expand
CONSTRAINTS ON THE ORBITAL EVOLUTION OF TRITON
We present simulations of Triton's postcapture orbit that confirm the importance of Kozai-type oscillations in its orbital elements. In the context of the tidal orbital evolution model, theseExpand
A possible constraint to Uranus' great collision
Abstract The system of the five major satellites of Uranus resembles those of Jupiter and Saturn in many ways. However, although Uranus' Jacobi limit is almost 7×107 km, the outermost known satelliteExpand
Pluto and Charon: A Case of Precession-Orbit Resonance
Pluto may be the only known case of precession-orbit resonance in the solar system. The Pluto-Charon system orbits the Sun with a period of 1 Plutonian year, which is 250.8 Earth years. The observedExpand
Orbital and Collisional Evolution of the Irregular Satellites
The irregular moons of the Jovian planets are a puzzling part of the solar system inventory. Unlike regular satellites, the irregular moons revolve around planets at large distances in tilted andExpand
Variation of the Equator due to a Highly Inclined and Eccentric Disturber
The New Horizons project is currently in progress, but until recently years ago, a mission to Neptune-Triton System predicted in the mid term 2008–2013 was one of the priorities of NASA's SolarExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 17 REFERENCES
On the origin of Triton and Pluto
Lyttleton hypothesized long ago that Triton and Pluto originated as adjacent prograde satellites of Neptune1. With the presently accepted masses of Triton and Pluto–Charon2,3, however, the momentumExpand
The satellites of Neptune and the origin of Pluto
Abstract Pluto and the chaotic satellite system of Neptune may have originated from a single encounter of Neptune with a massive solar system body. A series of numerical experiments has been carriedExpand
Gas drag in primordial circumplanetary envelopes: A mechanism for satellite capture
Abstract Some natural satellites may have been captured due to the gas drag they experienced in passing through primordial circumplanetary nebulas. This paper models such an encounter and derives theExpand
Q in the solar system
Abstract Secular changes brought about by tidal friction in the solar system are reviewed. The presence or absence of specific changes is used to bound the values of Q (the specific dissipationExpand
Some remarks on the capture of Triton and the origin of Pluto
Abstract Harrington and Van Flandern (1979, Icarus 39, 131–136) suggests that the irregular features of the Neptunian satellite system and Pluto's escape were caused by an encounter with a massiveExpand
Contribution of tidal dissipation to lunar thermal history.
Abstract The possible contributions of tidal heating to lunar thermal history are investigated. Analytic determinations of tidal dissipation in a homogeneous, incompressible Moon and in a two-layerExpand
Shepherding model for Neptune's arc ring
An incomplete arc ring has recently been discovered around Neptune1. Here, a model to explain the confinement of this ring is developed. The ring may be azimuthally confined near a triangularExpand
Towards a theory for the uranian rings
Interparticle collisions, radiation drag and differential precession all tend to disrupt the rings of Uranus. The first two effects lead to radial spreading which would disrupt a free ring in ≲108Expand
Occultation by a Possible Third Satellite of Neptune
TLDR
The 24 May 1981 close approach of Neptune to an uncataloged star was photoelectrically monitored from two observatories separated by 6 kilometers parallel to the occultation track, and an 8.1-second drop in signal is interpreted as resulting from the passage of a third satellite of Neptune in front of the star. Expand
Dynamical constraints on the formation and evolution of planetary bodies
The present investigation is concerned with a number of inferences as to the origin of planetary bodies, taking into account the present dynamical state of the solar system and some of theExpand
...
1
2
...