The scattering of small bodies in planetary systems
... In our consideration of the dynamics of material scattered from the outer belt by interior planets, we find that this dynamics is strongly dependent on the initial value of the Tisserand parameter, with respect to the outermost planet. Therefore, it is important to consider the value of this paramet ...
... In our consideration of the dynamics of material scattered from the outer belt by interior planets, we find that this dynamics is strongly dependent on the initial value of the Tisserand parameter, with respect to the outermost planet. Therefore, it is important to consider the value of this paramet ...
astro-ph/0507149 PDF
... The Kuiper Belt is divided into three distinct populations; the classic Kuiper Belt Objects, the resonant KBO’s, and the scattered KBO’s. The simulations presented here are representative of the classic Kuiper Belt population (containing 50% of all KBO’s) where the eccentricities are small (less tha ...
... The Kuiper Belt is divided into three distinct populations; the classic Kuiper Belt Objects, the resonant KBO’s, and the scattered KBO’s. The simulations presented here are representative of the classic Kuiper Belt population (containing 50% of all KBO’s) where the eccentricities are small (less tha ...
The Processing and Classification for the Spectra of Six Comets
... properties of comets. More importantly, the relationship between comets and asteroids can be studied. At present, it is known that some asteroids are the so-called “dead comets”, namely the remains of comets after their ejected matter was exhausted, for example, the parent of the Twins meteoric show ...
... properties of comets. More importantly, the relationship between comets and asteroids can be studied. At present, it is known that some asteroids are the so-called “dead comets”, namely the remains of comets after their ejected matter was exhausted, for example, the parent of the Twins meteoric show ...
Symplectic map description of Halley’s comet dynamics
... planet contributions of the SS kick function. According to (4) each contribution Fi (x) is proportional to µi the ratio between the ith planet mass and the total SS mass which explains the different kick function magnitude observed in Fig. 3. As Venus, Earth and Mars have semi axis of the order of H ...
... planet contributions of the SS kick function. According to (4) each contribution Fi (x) is proportional to µi the ratio between the ith planet mass and the total SS mass which explains the different kick function magnitude observed in Fig. 3. As Venus, Earth and Mars have semi axis of the order of H ...
suggested
... comparisons with laboratory spectra of simulations of the interstellar ices, it has been possible to identify about 15 molecules, radicals and ions. Fig. 5 shows observations made with the Infrared Space Observatory (ISO) of some of these molecules which are to be found in molecular cloud dust. In a ...
... comparisons with laboratory spectra of simulations of the interstellar ices, it has been possible to identify about 15 molecules, radicals and ions. Fig. 5 shows observations made with the Infrared Space Observatory (ISO) of some of these molecules which are to be found in molecular cloud dust. In a ...
The Galactic Environment of the Sun
... planet’s environment? Do they have a significant impact on a planet’s atmosphere? No one knows. These questions take on special significance in light of the fact that the interstellar medium—the sun’s galactic environment—is not a homogeneous substrate. Astronomers have discovered that interstellar ...
... planet’s environment? Do they have a significant impact on a planet’s atmosphere? No one knows. These questions take on special significance in light of the fact that the interstellar medium—the sun’s galactic environment—is not a homogeneous substrate. Astronomers have discovered that interstellar ...
Midterm Review, Greenhouse LT, Small Bodies Astronomy 1 — Elementary Astronomy
... The fact that short period comets have short periods compared to long period comets implies that shortperiod comets _____ than long-period comets. ...
... The fact that short period comets have short periods compared to long period comets implies that shortperiod comets _____ than long-period comets. ...
The Evolution of Molecular Clouds
... formation of molecular clouds must itself be a rather rapid process, and cannot take many dynamical timescales. Since the timescales for the formation, internal evolution, and destruction of molecular clouds are all of the same order, these processes probably cannot be clearly separated in time, and ...
... formation of molecular clouds must itself be a rather rapid process, and cannot take many dynamical timescales. Since the timescales for the formation, internal evolution, and destruction of molecular clouds are all of the same order, these processes probably cannot be clearly separated in time, and ...
Professor Comet: April, 2017
... These are nearby comets that reside between the boundary of the inner and outer planetary solar system with orbital periods between 3 – 20 years. There current orbits are influenced by the strong gravitational field of Jupiter which can adjust all or most of the orbital parameters of these bodies ar ...
... These are nearby comets that reside between the boundary of the inner and outer planetary solar system with orbital periods between 3 – 20 years. There current orbits are influenced by the strong gravitational field of Jupiter which can adjust all or most of the orbital parameters of these bodies ar ...
abū`l faẓl, independent discoverer of the great comet of 1577
... was above Venus because its colour was not affected. And many have told me that they have seen a comet beyond Jupiter and sometimes beyond Saturn. (Heiderzadeh, 2008: ...
... was above Venus because its colour was not affected. And many have told me that they have seen a comet beyond Jupiter and sometimes beyond Saturn. (Heiderzadeh, 2008: ...
SciPoster_Jan2009
... that could contain regions of active star formation within them; both are associated with IRAS sources, and based on prior shallow surveys, they both have a YSO candidate in the neighborhood. Spitzer observations with IRAC and MIPS allowed us to see deep inside the cloud, deeper than any prior obser ...
... that could contain regions of active star formation within them; both are associated with IRAS sources, and based on prior shallow surveys, they both have a YSO candidate in the neighborhood. Spitzer observations with IRAC and MIPS allowed us to see deep inside the cloud, deeper than any prior obser ...
The formation and destruction of molecular clouds and galactic star
... We first model the growth of molecular clouds. Inoue & Inutsuka (2012) showed that we need multiple episodes of compression of HI clouds to create molecular clouds. According to the standard picture of supernova-regulated ISM dynamics (e.g., McKee & Ostriker 1977), the typical timescale between cons ...
... We first model the growth of molecular clouds. Inoue & Inutsuka (2012) showed that we need multiple episodes of compression of HI clouds to create molecular clouds. According to the standard picture of supernova-regulated ISM dynamics (e.g., McKee & Ostriker 1977), the typical timescale between cons ...
here - Ira-Inaf
... The far infrared emissivity of the dust in the interstellar medium of the far outer Galaxy is smaller, and the pressure of the intercloud medium is much smaller (Brand and Wouterloot, 1996). Although these factors might be expected to negatively influence the cloud- and star-formation activity in th ...
... The far infrared emissivity of the dust in the interstellar medium of the far outer Galaxy is smaller, and the pressure of the intercloud medium is much smaller (Brand and Wouterloot, 1996). Although these factors might be expected to negatively influence the cloud- and star-formation activity in th ...
Giant molecular clouds in the Local Group galaxy M 33⋆⋆⋆
... by SRBY in the Milky Way. The use of second moments to measure linewidths provides very similar results but with more scatter. We note that Blitz et al. (2007) found similar results for Local Group galaxies and the outer Galaxy. This means that the clouds in M 33 are either larger for a given linewi ...
... by SRBY in the Milky Way. The use of second moments to measure linewidths provides very similar results but with more scatter. We note that Blitz et al. (2007) found similar results for Local Group galaxies and the outer Galaxy. This means that the clouds in M 33 are either larger for a given linewi ...
Jupiter – Friend or Foe? IV:The influence of orbital eccentricity and
... our simulations. For both the near-Earth asteroids (Horner & Jones, 2008b) and the short-period comets (Horner & Jones, 2009), we found that the greatest impact flux was experienced when the “Jupiter” in the simulation was between 0.2 and 0.3 times as massive as our Jupiter. In other words, our Jupi ...
... our simulations. For both the near-Earth asteroids (Horner & Jones, 2008b) and the short-period comets (Horner & Jones, 2009), we found that the greatest impact flux was experienced when the “Jupiter” in the simulation was between 0.2 and 0.3 times as massive as our Jupiter. In other words, our Jupi ...
ExoOrg_NAI
... such processing are illustrated in Figure 1.0. Detailed study of interstellar ices has advanced greatly in recent years7 with enhanced theoretical models and laboratory analogs, as well as with remote sensing. If comets in fact participated in the earliest formation of life by contributing pre-bioti ...
... such processing are illustrated in Figure 1.0. Detailed study of interstellar ices has advanced greatly in recent years7 with enhanced theoretical models and laboratory analogs, as well as with remote sensing. If comets in fact participated in the earliest formation of life by contributing pre-bioti ...
our knowledge of high-mass star formation at the dawn of - CEA-Irfu
... star continues to accrete material through the equator where the opacity is much higher. This effect which has first been proposed by Nakano et al. (1995) and Jijina & Adams (1996) is known as the “flashlight effect”. Once the stellar mass has grown to about 33.6 M⊙ , the central star is no longer a ...
... star continues to accrete material through the equator where the opacity is much higher. This effect which has first been proposed by Nakano et al. (1995) and Jijina & Adams (1996) is known as the “flashlight effect”. Once the stellar mass has grown to about 33.6 M⊙ , the central star is no longer a ...
CHAPTER 1 Meteorites, Asteroids, and Comets
... next planet outward. – If this is true, then the asteroids are the remains of ...
... next planet outward. – If this is true, then the asteroids are the remains of ...
a PDF file - National Optical Astronomy Observatory
... It is moving faster than any earth space probe and is as big as a mountain. The last time it visited the inner solar system, Stonehenge was about to reach its final configuration and the great Ziggurat of Ur was about to be built. It is Comet Hale-Bopp.” 1 ...
... It is moving faster than any earth space probe and is as big as a mountain. The last time it visited the inner solar system, Stonehenge was about to reach its final configuration and the great Ziggurat of Ur was about to be built. It is Comet Hale-Bopp.” 1 ...
The Most Luminous Protostars in Molecular Clouds: A Hint to
... MCL , indicating that the parent cloud mass is a decisive parameter influencing the population of massive stars. Besides, the LMAX values in H II regions are generally higher than the others, strongly indicating that brighter and more massive stars can form in clouds surrounded by the high external ...
... MCL , indicating that the parent cloud mass is a decisive parameter influencing the population of massive stars. Besides, the LMAX values in H II regions are generally higher than the others, strongly indicating that brighter and more massive stars can form in clouds surrounded by the high external ...
The local ISM in three dimensions: kinematics
... data for 157 lines of sight by Redfield and Linsky (2008). Three of these clouds have irregular shapes as seen from the Earth, but the Mic cloud is filamentary. With only 15 lines of sight to determine its shape, the thickness of this cloud is not well determined. Figure 5 shows the angular distribu ...
... data for 157 lines of sight by Redfield and Linsky (2008). Three of these clouds have irregular shapes as seen from the Earth, but the Mic cloud is filamentary. With only 15 lines of sight to determine its shape, the thickness of this cloud is not well determined. Figure 5 shows the angular distribu ...
Data/hora: 22/04/2017 00:54:31 Provedor de dados: 5 País: France
... the Solar System. Methane was formed in the interstellar medium prior to having been embedded in the protosolar nebula gas phase. This molecule was subsequently trapped in clathrates that formed from crystalline water ice during the cooling of the disk and incorporated in this form into the building ...
... the Solar System. Methane was formed in the interstellar medium prior to having been embedded in the protosolar nebula gas phase. This molecule was subsequently trapped in clathrates that formed from crystalline water ice during the cooling of the disk and incorporated in this form into the building ...
Jupiter: Cosmic Jekyll and Hyde - Mary Ann Liebert, Inc. publishers
... have occurred throughout its geological history. For example, one of the five major extinction events (Raup and Sepkoski, 1982), the Cretaceous-Paleogene (K-Pg) extinction, was initiated when a 16 km bolide impacted what is today the Yucatan Peninsula near the town of Chicxulub. Originally hypothesi ...
... have occurred throughout its geological history. For example, one of the five major extinction events (Raup and Sepkoski, 1982), the Cretaceous-Paleogene (K-Pg) extinction, was initiated when a 16 km bolide impacted what is today the Yucatan Peninsula near the town of Chicxulub. Originally hypothesi ...
The Neptune Trojans: a window on the birth of the solar system
... even objects discovered in the past decade might revolutionize our understanding of the formation and evolution of the solar system, as well as provide answers to key questions about its current state. These seven objects comprise the known Neptune Trojans – first members of a population postulated ...
... even objects discovered in the past decade might revolutionize our understanding of the formation and evolution of the solar system, as well as provide answers to key questions about its current state. These seven objects comprise the known Neptune Trojans – first members of a population postulated ...
Slide 1
... • What Is a Comet? A small body of ice, rock, and cosmic dust loosely packed together is called a comet. • Comet Tails When a comet passes close enough to the sun, solar radiation heats the ice so that the comet gives off gas and dust in the form of a long tail. ...
... • What Is a Comet? A small body of ice, rock, and cosmic dust loosely packed together is called a comet. • Comet Tails When a comet passes close enough to the sun, solar radiation heats the ice so that the comet gives off gas and dust in the form of a long tail. ...
Oort cloud
The Oort cloud (/ˈɔrt/ or /ˈʊərt/) or Öpik–Oort cloud, named after Dutch astronomer Jan Oort and Estonian astronomer Ernst Öpik, is a theoretical spherical cloud of predominantly icy planetesimals believed to surround the Sun at a distance of up to around 100,000 AU (2 ly). This places it at almost half of the distance to Proxima Centauri, the nearest star to the Sun, and in interstellar space. The Kuiper belt and the scattered disc, the other two reservoirs of trans-Neptunian objects, are less than one thousandth as far from the Sun as the Oort cloud. The outer limit of the Oort cloud defines the cosmographical boundary of the Solar System and the region of the Sun's gravitational dominance.The Oort cloud is thought to comprise two regions: a spherical outer Oort cloud and a disc-shaped inner Oort cloud, or Hills cloud. Objects in the Oort cloud are largely composed of ices, such as water, ammonia, and methane.Astronomers conjecture that the matter composing the Oort cloud formed closer to the Sun and was scattered far into space by the gravitational effects of the giant planets early in the Solar System's evolution. Although no confirmed direct observations of the Oort cloud have been made, it may be the source of all long-period and Halley-type comets entering the inner Solar System, and many of the centaurs and Jupiter-family comets as well. The outer Oort cloud is only loosely bound to the Solar System, and thus is easily affected by the gravitational pull both of passing stars and of the Milky Way itself. These forces occasionally dislodge comets from their orbits within the cloud and send them towards the inner Solar System. Based on their orbits, most of the short-period comets may come from the scattered disc, but some may still have originated from the Oort cloud.