Characterization of the physical properties of the ROSETTA target
... This thesis is based on the analysis and interpretation of photometric and spectroscopic observations of the Jupiter family comet (JFC) 67P/Churyumov-Gerasimenko (67P/C-G) at large heliocentric distance. The aim of this study is to provide a good characterization of the nucleus of the ROSETTA target ...
... This thesis is based on the analysis and interpretation of photometric and spectroscopic observations of the Jupiter family comet (JFC) 67P/Churyumov-Gerasimenko (67P/C-G) at large heliocentric distance. The aim of this study is to provide a good characterization of the nucleus of the ROSETTA target ...
Trans-Neptunian Objects as Natural Probes to the Unknown Solar System
... based on the masses and heliocentric distances of the planets, which extends continuously in the outer solar system starting 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. Ba ...
... based on the masses and heliocentric distances of the planets, which extends continuously in the outer solar system starting 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. Ba ...
Famous Comets - Mr. Hill`s Science Website
... into view, he turned his telescope to a group of stars called M70 (a globular cluster). At a similar time, Tom Bopp, an amateur astronomer at a "star party" in Phoenix (a gathering for astronomers to observe the stars together!), was also observing the M70 globular cluster. Both astronomers noticed ...
... into view, he turned his telescope to a group of stars called M70 (a globular cluster). At a similar time, Tom Bopp, an amateur astronomer at a "star party" in Phoenix (a gathering for astronomers to observe the stars together!), was also observing the M70 globular cluster. Both astronomers noticed ...
the comet`s tale - Institute of Astronomy
... of Astronomy in Cambridge, has recently stripped out its “common terminal area” to turn it into offices, on the grounds that these days everyone has their own laptop or desktop. An aim of the meeting was to give potential imagers the opportunity to work through techniques with mentors on hand, all u ...
... of Astronomy in Cambridge, has recently stripped out its “common terminal area” to turn it into offices, on the grounds that these days everyone has their own laptop or desktop. An aim of the meeting was to give potential imagers the opportunity to work through techniques with mentors on hand, all u ...
Observations and Theory of Dynamical Triggers for Star Formation
... M16 (Hester et al. 1996), and M8 (Caulet 1997). Other similar regions have been found in the Sco-Cen association (Bertoldi & Jenkins 1992). Some of these neutral regions may be protostellar disks, as argued in the papers on Orion, but Hester et al. (1996) claims that many are evaporating globules ra ...
... M16 (Hester et al. 1996), and M8 (Caulet 1997). Other similar regions have been found in the Sco-Cen association (Bertoldi & Jenkins 1992). Some of these neutral regions may be protostellar disks, as argued in the papers on Orion, but Hester et al. (1996) claims that many are evaporating globules ra ...
THE COMET`S TALE - Institute of Astronomy
... that he never before had been so much impressed with the vapoury nature of such bodies, and that one could readily imagine that the comet of Encke could be compressed into the compass of a nutshell. In the report to the 32nd AGM it was noted 'that Faye's comet on its first return in 1850, was observ ...
... that he never before had been so much impressed with the vapoury nature of such bodies, and that one could readily imagine that the comet of Encke could be compressed into the compass of a nutshell. In the report to the 32nd AGM it was noted 'that Faye's comet on its first return in 1850, was observ ...
Pluto, Charon & the Plutons
... • Resonant KBOs: are found in resonances with Neptune, mostly at the 3:2 resonance - just like Pluto - and make up about 35% of the KBOs population. They’re often called Plutinos. • Scattered KBOs: are on large highly eccentric and inclined orbits. They’re on very distant orbits - out as a few 100 A ...
... • Resonant KBOs: are found in resonances with Neptune, mostly at the 3:2 resonance - just like Pluto - and make up about 35% of the KBOs population. They’re often called Plutinos. • Scattered KBOs: are on large highly eccentric and inclined orbits. They’re on very distant orbits - out as a few 100 A ...
Isaac NEWTON: Philosophiae Naturalis Principia Mathematica. 3 Ed
... the comet is given, the distance of the comet will be given, by saying that the distance will be to the distance of a planet, in the ratio of the diameter [of the comet] to the diameter of the planet directly & inversely in the inverse square root ratio of the light [of the comet] to the light of th ...
... the comet is given, the distance of the comet will be given, by saying that the distance will be to the distance of a planet, in the ratio of the diameter [of the comet] to the diameter of the planet directly & inversely in the inverse square root ratio of the light [of the comet] to the light of th ...
The Formation of Population III Stars in Gas Accretion Stage: Effects
... Using a three dimensional simulation, Saigo et al. (2004) investigated the evolution of a collapsing primordial cloud with a simple initial setting and showed fragmentation before protostar formation (see also Machida et al. 2008, 2009a,b). Recently, starting from the cosmological setting, Turk et a ...
... Using a three dimensional simulation, Saigo et al. (2004) investigated the evolution of a collapsing primordial cloud with a simple initial setting and showed fragmentation before protostar formation (see also Machida et al. 2008, 2009a,b). Recently, starting from the cosmological setting, Turk et a ...
High-mass star-forming cloud G0.38+0.04 in the Galactic center dust
... Sgr B2 (M): there is only one SiO maser spot in Sgr B2, located near Mehringer et al. (1994) H2 CO Source C (not to be confused with Cloud C, the topic of this paper). The Sgr B2 H2 CO maser C is peculiar even among the Sgr B2 masers in that the emission appears to be spatially and spectrally resolv ...
... Sgr B2 (M): there is only one SiO maser spot in Sgr B2, located near Mehringer et al. (1994) H2 CO Source C (not to be confused with Cloud C, the topic of this paper). The Sgr B2 H2 CO maser C is peculiar even among the Sgr B2 masers in that the emission appears to be spatially and spectrally resolv ...
The Dynamical Structure of the Kuiper Belt and Its Primordial Origin
... eccentricity of the classical belt is ~0.07. It should be noted, however, that the upper eccentricity boundary of this population is set by the long-term orbital stability of the Kuiper belt (see Plate 7), and thus this semimajor axis region could have contained at some time in the past objects with ...
... eccentricity of the classical belt is ~0.07. It should be noted, however, that the upper eccentricity boundary of this population is set by the long-term orbital stability of the Kuiper belt (see Plate 7), and thus this semimajor axis region could have contained at some time in the past objects with ...
COMET 17/P Holmes - The O`Neal Web Site
... mag. If that wasn’t enough it went from just a few arcseconds in diameter to a few whopping degrees in apparent diameter. • Every single night out with comet Holmes was like a night out with a totally new comet. One night it had a jet, next night it had two nuclei, then it had a tail, then the ta ...
... mag. If that wasn’t enough it went from just a few arcseconds in diameter to a few whopping degrees in apparent diameter. • Every single night out with comet Holmes was like a night out with a totally new comet. One night it had a jet, next night it had two nuclei, then it had a tail, then the ta ...
Planet X, Comets and Earth Changes
... with their own eyes, and to claim now that the Great Flood and these remnants never existed, or to minimize it as some smaller localized event. When Aristotle’s uncle Solon traveled to Egypt, his intention was to research for the young Greek nation the history of the human race. Still in existence w ...
... with their own eyes, and to claim now that the Great Flood and these remnants never existed, or to minimize it as some smaller localized event. When Aristotle’s uncle Solon traveled to Egypt, his intention was to research for the young Greek nation the history of the human race. Still in existence w ...
SPIRAL STRUCTURE IN THE OUTER GALACTIC
... indicate that the Local arm enters the TGQ and extends in the direction of the Vela region (255 Y275 ; May et al. 1988; Murphy & May 1991) up to the limit of the CO survey at 8 kpc from the Sun. Such evidence is also present in the H i study performed by Burton (1985). On the other hand, optical s ...
... indicate that the Local arm enters the TGQ and extends in the direction of the Vela region (255 Y275 ; May et al. 1988; Murphy & May 1991) up to the limit of the CO survey at 8 kpc from the Sun. Such evidence is also present in the H i study performed by Burton (1985). On the other hand, optical s ...
Comet Kirch in Art and Astronomy
... reached its perihelion on 8th of December 1680 (18th December) passing at a distance of 0,0062 AU (around 930000 km) from the Sun, and its closest approach to the Earth was on 20th of November (30th November N. S.) of 0,42 AU. The Kirch Comet was visible with naked eye before sunrise and after sunse ...
... reached its perihelion on 8th of December 1680 (18th December) passing at a distance of 0,0062 AU (around 930000 km) from the Sun, and its closest approach to the Earth was on 20th of November (30th November N. S.) of 0,42 AU. The Kirch Comet was visible with naked eye before sunrise and after sunse ...
Measuring distances to the edge of the local group
... formed primarily from the agglomeration of dust within the solar nebula. Herndon (2004) showed that this model did not produce sufficiently massive planetary cores, so he proposed a model in which the cores of the inner planets condensed within massive gaseous envelopes similar to present-day gas gi ...
... formed primarily from the agglomeration of dust within the solar nebula. Herndon (2004) showed that this model did not produce sufficiently massive planetary cores, so he proposed a model in which the cores of the inner planets condensed within massive gaseous envelopes similar to present-day gas gi ...
Studies of molecular clouds at the Galactic centre Roland Karlsson DECLINATION (B1950)
... the Odin satellite observatory have been used for investigations of the carbon monoxide and water species, with high velocity resolution, but less angular resolution compared to the VLA. The Odin satellite has provided a long time series of water observations. The main region studied in this work co ...
... the Odin satellite observatory have been used for investigations of the carbon monoxide and water species, with high velocity resolution, but less angular resolution compared to the VLA. The Odin satellite has provided a long time series of water observations. The main region studied in this work co ...
Formation of Molecular Clouds and Global Conditions for Star
... to be insufficient (e.g., Silk 1980). More recently these conclusions have been challenged by new observations, which have revised estimates of magnetic field strengths downwards, and new simulations and theoretical models that suggest that clouds may in fact be turbulence-supported, or that they ma ...
... to be insufficient (e.g., Silk 1980). More recently these conclusions have been challenged by new observations, which have revised estimates of magnetic field strengths downwards, and new simulations and theoretical models that suggest that clouds may in fact be turbulence-supported, or that they ma ...
The Dynamical Evolution of the Asteroid Belt
... by Gradie and Tedesco (1982) for the largest asteroids, the inner belt is dominated by S-complex asteroids, many of which are probably related to the meteorites known as ordinary chondrites (Binzel et al., 1996; see also the chapter by Vernazza et al. in this volume). The central belt (2.5–3.2 AU) i ...
... by Gradie and Tedesco (1982) for the largest asteroids, the inner belt is dominated by S-complex asteroids, many of which are probably related to the meteorites known as ordinary chondrites (Binzel et al., 1996; see also the chapter by Vernazza et al. in this volume). The central belt (2.5–3.2 AU) i ...
New Extreme Trans-Neptunian Objects: Towards a Super
... interactions with the galactic tide, Sedna and 2012 VP113 are too tightly bound to the Sun to be strongly perturbed by outside forces. For this reason, Sedna and 2012 VP113 have been called inner Oort cloud (IOC) objects. Several viable theories have been put forth to explain the orbits of IOC objec ...
... interactions with the galactic tide, Sedna and 2012 VP113 are too tightly bound to the Sun to be strongly perturbed by outside forces. For this reason, Sedna and 2012 VP113 have been called inner Oort cloud (IOC) objects. Several viable theories have been put forth to explain the orbits of IOC objec ...
Mapping of the extinction in giant molecular clouds using optical star
... discovered by IRAS. Hetem and Lépine (1993) used this geometrical approach to generate clouds with some statistical properties observed in real clouds. They showed that classical models of spherical clouds can be improved by a fractal modelisation ...
... discovered by IRAS. Hetem and Lépine (1993) used this geometrical approach to generate clouds with some statistical properties observed in real clouds. They showed that classical models of spherical clouds can be improved by a fractal modelisation ...
Document
... • is in orbit (path of one object around a point or another point) around the Sun; • has sufficient mass for its self-gravity to overcome rigid body forces (is an idealization of a solid body of finite size in which deformation is neglected. In other words, the distance between any two given points ...
... • is in orbit (path of one object around a point or another point) around the Sun; • has sufficient mass for its self-gravity to overcome rigid body forces (is an idealization of a solid body of finite size in which deformation is neglected. In other words, the distance between any two given points ...
Did Saturn`s rings form during the Late Heavy Bombardment?
... the origin of the LHB [Tsiganis, K., Gomes, R., Morbidelli, A., Levison, H.F., 2005. Nature 435, 459–461; Morbidelli, A., Levison, H.H., Tsiganis, K., Gomes, R., 2005. Nature 435, 462–465; Gomes, R., Levison, H.F., Tsiganis, K., Morbidelli, A., 2005. Nature 435, 466–469] and on the size distribution ...
... the origin of the LHB [Tsiganis, K., Gomes, R., Morbidelli, A., Levison, H.F., 2005. Nature 435, 459–461; Morbidelli, A., Levison, H.H., Tsiganis, K., Gomes, R., 2005. Nature 435, 462–465; Gomes, R., Levison, H.F., Tsiganis, K., Morbidelli, A., 2005. Nature 435, 466–469] and on the size distribution ...
Asteroids, Comets, and Meteorites: Cosmic Invaders of the Earth
... material to clump together. The temperature of the protouniverse eventually cooled sufficiently to allow the formation of protons and neutrons, which came together into atomic nuclei. At some point following the big bang, fluctuations in the smooth flow of matter and energy served as seeds for galax ...
... material to clump together. The temperature of the protouniverse eventually cooled sufficiently to allow the formation of protons and neutrons, which came together into atomic nuclei. At some point following the big bang, fluctuations in the smooth flow of matter and energy served as seeds for galax ...
docx file
... came within only 1/10th of the Earth-Sun distance from the Earth in late March. At that time, Comet Hyakutake, dubbed the Great Comet of 1996, became the brightest comet to grace the skies of Earth in 20 years. During its previous visit, Comet Hyakutake may well have been seen by the stone age Magda ...
... came within only 1/10th of the Earth-Sun distance from the Earth in late March. At that time, Comet Hyakutake, dubbed the Great Comet of 1996, became the brightest comet to grace the skies of Earth in 20 years. During its previous visit, Comet Hyakutake may well have been seen by the stone age Magda ...
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.