CHEOPS Definition Study Report
... Programme Committee (SPC) for a definition phase study as the first Small mission in Cosmic Vision 20152025. CHEOPS is an ESA mission to be implemented in partnership with Switzerland, with a number of member states delivering significant contributions. These member states are Austria, Belgium, Fran ...
... Programme Committee (SPC) for a definition phase study as the first Small mission in Cosmic Vision 20152025. CHEOPS is an ESA mission to be implemented in partnership with Switzerland, with a number of member states delivering significant contributions. These member states are Austria, Belgium, Fran ...
Oort Cloud Formation and Dynamics
... of the planetesimals onto planet-crossing orbits in 10 m.y. or less (Gladman and Duncan, 1990; Holman and Wisdom, 1993; Levison and Duncan, 1993; Grazier et al., 1999a,b). The major exception to this rule is in the Kuiper belt, where some orbits remain stable for billions of years (Holman and Wisdom ...
... of the planetesimals onto planet-crossing orbits in 10 m.y. or less (Gladman and Duncan, 1990; Holman and Wisdom, 1993; Levison and Duncan, 1993; Grazier et al., 1999a,b). The major exception to this rule is in the Kuiper belt, where some orbits remain stable for billions of years (Holman and Wisdom ...
THE IRREGULAR SATELLITES: THE MOST COLLISIONALLY
... and retrograde orbits in a realm where planetary perturbations are only slightly larger than solar ones. Their size distributions and total numbers are surprisingly comparable to one another, with the observed populations at Jupiter, Saturn, and Uranus having remarkably shallow power-law slopes for ...
... and retrograde orbits in a realm where planetary perturbations are only slightly larger than solar ones. Their size distributions and total numbers are surprisingly comparable to one another, with the observed populations at Jupiter, Saturn, and Uranus having remarkably shallow power-law slopes for ...
Presentation in PDF format.
... 1. The broadly cosmological, ‘quasi-religious’ strand, going back thousands of years — the quest to understand our ‘Origins’, Man’s place in the Universe etc.; 2. The ‘practical’ strand, i.e. the commercial, military, and economic ‘spin-off’ from astronomy, nowadays including education and the arts — ...
... 1. The broadly cosmological, ‘quasi-religious’ strand, going back thousands of years — the quest to understand our ‘Origins’, Man’s place in the Universe etc.; 2. The ‘practical’ strand, i.e. the commercial, military, and economic ‘spin-off’ from astronomy, nowadays including education and the arts — ...
PYTS/ASTR 206 – Comets
... Have very long periods/large orbits Many of these appear to be on their first pass through the inner solar system ...
... Have very long periods/large orbits Many of these appear to be on their first pass through the inner solar system ...
Regular and Chaotic Dynamics in the Mean
... (Ferraz-Mello and Klafke, 1991; Klafke et al., 1992; Saha, 1992). This result suggested that resonant bodies can be transported to Mars-, Earth-, and Venus-crossing orbits and then be efficiently extracted from the resonances due to the larger mass of the two latter planets. The cited works confirme ...
... (Ferraz-Mello and Klafke, 1991; Klafke et al., 1992; Saha, 1992). This result suggested that resonant bodies can be transported to Mars-, Earth-, and Venus-crossing orbits and then be efficiently extracted from the resonances due to the larger mass of the two latter planets. The cited works confirme ...
On the formation of Uranus and Neptune
... present epoch, showing the giant planets and those Kuiper belt objectç which have been observed a t multiple oppositions. The w e in the top panel shows the locus of orbits with perihelia at the semimajor axïs of Neptune. . . . . . . . . . . . . . . . The initial state for runs in Set 1,showing ecce ...
... present epoch, showing the giant planets and those Kuiper belt objectç which have been observed a t multiple oppositions. The w e in the top panel shows the locus of orbits with perihelia at the semimajor axïs of Neptune. . . . . . . . . . . . . . . . The initial state for runs in Set 1,showing ecce ...
Critique of Modern Oort Comet Theory
... and more recent scientists suggest the number of comets in the Oort cloud would be approximately 1011. Oort also considered that if an object reached distances of tens of thousands of A.U. from the sun, perturbations from the planets would be negligible and the perturbations of nearby stars would be ...
... and more recent scientists suggest the number of comets in the Oort cloud would be approximately 1011. Oort also considered that if an object reached distances of tens of thousands of A.U. from the sun, perturbations from the planets would be negligible and the perturbations of nearby stars would be ...
Astrobiología Kepler`s third law
... Detection of the planetary transit in the nearby M-dwarf star GJ 436 using small telescopes. With R = 0.35 RJ, this is the smallest extrasolar planet detected so far. The small size confirms that it is a Neptune-like planet, probably made of ice, and with an atmosphere of light elements (H, He). ...
... Detection of the planetary transit in the nearby M-dwarf star GJ 436 using small telescopes. With R = 0.35 RJ, this is the smallest extrasolar planet detected so far. The small size confirms that it is a Neptune-like planet, probably made of ice, and with an atmosphere of light elements (H, He). ...
Evolution of Comets Into Asteroids - SwRI Boulder
... objects in planet-crossing orbits, as well as nongravitational accelerations on comets caused by outgassing, make it impossible to track orbits accurately backwards (or forwards) in time more than a few decades to centuries. The obscuring effects of cometary comae make it difficult to apply the same ...
... objects in planet-crossing orbits, as well as nongravitational accelerations on comets caused by outgassing, make it impossible to track orbits accurately backwards (or forwards) in time more than a few decades to centuries. The obscuring effects of cometary comae make it difficult to apply the same ...
dynamical history of the asteroid belt and implications for terrestrial
... gaps, there are numerous weak resonances that cause long term orbital chaos and transport asteroids out of the main belt (Morbidelli and Nesvorny, 1999). A very powerful secular resonance that occurs where the pericenter precession rate of an asteroid is nearly the same as that of one of the solar s ...
... gaps, there are numerous weak resonances that cause long term orbital chaos and transport asteroids out of the main belt (Morbidelli and Nesvorny, 1999). A very powerful secular resonance that occurs where the pericenter precession rate of an asteroid is nearly the same as that of one of the solar s ...
Chapter 21 A Family of Planets
... The outer solar system contains four planets: Jupiter, Saturn, Uranus, and Neptune. The outer planets are very different from the inner planets. The outer planets are very large and are made mostly of gases. Therefore, Jupiter, Saturn, Uranus, and Neptune are sometimes called the gas giant planets, ...
... The outer solar system contains four planets: Jupiter, Saturn, Uranus, and Neptune. The outer planets are very different from the inner planets. The outer planets are very large and are made mostly of gases. Therefore, Jupiter, Saturn, Uranus, and Neptune are sometimes called the gas giant planets, ...
Obliquity Variability of a Potentially Habitable Early Venus
... et al., 2012) showed that such variations would not be as large as those of Mars, the difference between commensurate precessions and noncommensurate precessions is stark. Atobe and Ida (2007) investigated the obliquity evolution of potentially habitable extrasolar planets with large moons, followin ...
... et al., 2012) showed that such variations would not be as large as those of Mars, the difference between commensurate precessions and noncommensurate precessions is stark. Atobe and Ida (2007) investigated the obliquity evolution of potentially habitable extrasolar planets with large moons, followin ...
Resonant Origins for Pluto`s High Inclination
... Jupiter would either be directed inward towards Jupiter or outwards with insufficient force to escape. Jupiter, on the other hand, was capable of scattering planetesimals outward with enough force to prevent their return. As a result, Saturn, Uranus, and Neptune preferentially scattered inward while ...
... Jupiter would either be directed inward towards Jupiter or outwards with insufficient force to escape. Jupiter, on the other hand, was capable of scattering planetesimals outward with enough force to prevent their return. As a result, Saturn, Uranus, and Neptune preferentially scattered inward while ...
The PLATO 2.0 mission
... It is the goal of PLATO 2.0 (PLAnetary Transits and Oscillation of stars) to find these planets and provide the first catalogue of potentially habitable planets with known mean densities and ages. Mean densities will be obtained from planet radius measurements via the photometric transit method appl ...
... It is the goal of PLATO 2.0 (PLAnetary Transits and Oscillation of stars) to find these planets and provide the first catalogue of potentially habitable planets with known mean densities and ages. Mean densities will be obtained from planet radius measurements via the photometric transit method appl ...
On the Migratory Behavior of Planetary Systems The Harvard
... underwent a period of upheaval, during which giant planets “migrated” from where they formed. This thesis addresses a question key to understanding how planetary systems evolve: is planetary migration typically a smooth, disk-driven process or a violent process involving strong multi-body gravitatio ...
... underwent a period of upheaval, during which giant planets “migrated” from where they formed. This thesis addresses a question key to understanding how planetary systems evolve: is planetary migration typically a smooth, disk-driven process or a violent process involving strong multi-body gravitatio ...
Irregular Satellites - Southwest Research Institute
... 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 and eccentric orbits. Their origin, which is intimately linked with the origin of the planets themselves, is ...
... 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 and eccentric orbits. Their origin, which is intimately linked with the origin of the planets themselves, is ...
Other topics
... Scattered disc objects have high e and perihelion between 33 and 40 AU Centaurs have perihelion within 30 AU – source of Jupiter family comets Classical KBOs have low e and semimajor axes between 37 and 48 AU – future target of New Horizons Copenhagen 2015 (Lecture 3) ...
... Scattered disc objects have high e and perihelion between 33 and 40 AU Centaurs have perihelion within 30 AU – source of Jupiter family comets Classical KBOs have low e and semimajor axes between 37 and 48 AU – future target of New Horizons Copenhagen 2015 (Lecture 3) ...
Preprint - Lunar and Planetary Laboratory
... Unless otherwise noted, each of our simulations included the four giant planets Jupiter, Saturn, Tab. 1 Uranus, and Neptune. The radial migration of these planets followed a smooth time variation of their semi-major axes, a. A time scale τ was used to characterize the migration, where a(t) = a(0) + ...
... Unless otherwise noted, each of our simulations included the four giant planets Jupiter, Saturn, Tab. 1 Uranus, and Neptune. The radial migration of these planets followed a smooth time variation of their semi-major axes, a. A time scale τ was used to characterize the migration, where a(t) = a(0) + ...
Primordial Excitation and Depletion of the Main Belt
... of the solar system or longer (Geissler et al., 1996). Most of these are primordial asteroids, i.e., they were already present in the belt at the end of its excitation and mass depletion, after the terrestrial planets were completely formed. The few large bodies that were destroyed generally yielded ...
... of the solar system or longer (Geissler et al., 1996). Most of these are primordial asteroids, i.e., they were already present in the belt at the end of its excitation and mass depletion, after the terrestrial planets were completely formed. The few large bodies that were destroyed generally yielded ...
Jupiter`s Outer Satellites and Trojans
... their descendants survive today in the Kuiper Belt . The Kuiper Belt in turn feeds the giant-planet crossing Centaurs , which are then converted by planetary (largely Jovian) perturbations into Jupiter Family Comets (JFCs; short-period comets which are strongly interacting with Jupiter, formally tho ...
... their descendants survive today in the Kuiper Belt . The Kuiper Belt in turn feeds the giant-planet crossing Centaurs , which are then converted by planetary (largely Jovian) perturbations into Jupiter Family Comets (JFCs; short-period comets which are strongly interacting with Jupiter, formally tho ...
Trans-Neptunian Objects as Natural Probes to the Unknown Solar System
... at the orbit of Jupiter. The extrapolation of this distribution to distances beyond Neptune suggested the existence of several Earth masses (M⊕ ) of materials beyond 30 AU. Based on these considerations, researchers postulated the existence of a massive population beyond Neptune’s orbit composed of ...
... at the orbit of Jupiter. The extrapolation of this distribution to distances beyond Neptune suggested the existence of several Earth masses (M⊕ ) of materials beyond 30 AU. Based on these considerations, researchers postulated the existence of a massive population beyond Neptune’s orbit composed of ...
Irregular Satellites of the Planets: Products of Capture in the Early
... 2003) but this is not a viable explanation for the irregular satellites. In particular, many irregular satellites follow retrograde orbits (inclinations >90◦ ) that are incompatible with formation in prograde rotating accretion disks. The most plausible explanation is that the irregular satellites w ...
... 2003) but this is not a viable explanation for the irregular satellites. In particular, many irregular satellites follow retrograde orbits (inclinations >90◦ ) that are incompatible with formation in prograde rotating accretion disks. The most plausible explanation is that the irregular satellites w ...
The dynamics of Jupiter and Saturn in the gaseous protoplanetary disk
... If true, this model implies that, at the disappearance of the gas, the giant planets and the primordial trans-neptunian planetesimal disk were originally in a compact configuration. This limits severely the radial migration of the planets during the preceding phase, dominated by the interactions wit ...
... If true, this model implies that, at the disappearance of the gas, the giant planets and the primordial trans-neptunian planetesimal disk were originally in a compact configuration. This limits severely the radial migration of the planets during the preceding phase, dominated by the interactions wit ...