disappearance of comet c/2010 x1 (elenin): gone with a whimper
... comet faded even as the heliocentric distance continued to decrease. We find that most of the surge in brightness in mid-August resulted from dust-particle forward scattering, not from a sudden increase in the activity. A much smaller (∼3 mag) brightening began on UT 2011 August 18 ± 1 (heliocentric ...
... comet faded even as the heliocentric distance continued to decrease. We find that most of the surge in brightness in mid-August resulted from dust-particle forward scattering, not from a sudden increase in the activity. A much smaller (∼3 mag) brightening began on UT 2011 August 18 ± 1 (heliocentric ...
Physical Properties of the Gas and Dust in the Orion B Molecular
... GMCs in the Orion complex (see Chapter of Bally & Heiles). It extends over 40 × 60 pc (6◦ × 8◦ ) northward from the Orion Nebula and contains several wellknown star-forming regions such as NGC 2071, NGC 2068, M 78 (HH 19–27), NGC 2024, and NGC 2023 (see Fig. 1). The two Orion clouds are located betw ...
... GMCs in the Orion complex (see Chapter of Bally & Heiles). It extends over 40 × 60 pc (6◦ × 8◦ ) northward from the Orion Nebula and contains several wellknown star-forming regions such as NGC 2071, NGC 2068, M 78 (HH 19–27), NGC 2024, and NGC 2023 (see Fig. 1). The two Orion clouds are located betw ...
Jupiter`s Outer Satellites and Trojans
... The smallest known irregular satellites have effective diameters of order 1 km (Table 12.1). Presumably, much smaller satellites exist: the timescales for orbit decay by PoyntingRobertson and plasma drag exceed the age of the solar system for diameters in excess of a few centimeters. The irregular sa ...
... The smallest known irregular satellites have effective diameters of order 1 km (Table 12.1). Presumably, much smaller satellites exist: the timescales for orbit decay by PoyntingRobertson and plasma drag exceed the age of the solar system for diameters in excess of a few centimeters. The irregular sa ...
1997 Apparition of Comet Hale-Bopp - HIGP
... Hot Idea Contents Historical Comet Observations. Comets have been the most feared celestial objects in history because of their sudden and sometimes bright appearance. When near the sun, comets can be the largest objects in the Solar System. To ancient peoples, they were interpreted as ill omens of ...
... Hot Idea Contents Historical Comet Observations. Comets have been the most feared celestial objects in history because of their sudden and sometimes bright appearance. When near the sun, comets can be the largest objects in the Solar System. To ancient peoples, they were interpreted as ill omens of ...
Was the bright comet of 1742 discovered from India?
... 21:00 UT onwards and would have risen above the horizon before sunrise in the last days of January only. Until then, there are no observations reported from anywhere else. In fact, after its discovery from the Cape, there were hardly any observations in the month of February3,7. It is necessary to a ...
... 21:00 UT onwards and would have risen above the horizon before sunrise in the last days of January only. Until then, there are no observations reported from anywhere else. In fact, after its discovery from the Cape, there were hardly any observations in the month of February3,7. It is necessary to a ...
threat definition and verification
... This crop circle has another unusual feature; an off-center cleared circle containing the inner planets’ orbits. Assuming this circle defines the centroid of the Sun-Vulcan complex, then it is in the direction of Vulcan as of either the date the T367 crop circle was formed or the date represented by ...
... This crop circle has another unusual feature; an off-center cleared circle containing the inner planets’ orbits. Assuming this circle defines the centroid of the Sun-Vulcan complex, then it is in the direction of Vulcan as of either the date the T367 crop circle was formed or the date represented by ...
Observationes Cometarvm Anni 1618
... these types of events got rulers seriously concerned about their auspiciousness and possible consequences, so they even sought counsel for remedial measures. At this time, generally there was no clear distinction between astrology and astronomy, and superstition remained entwined with both. Many med ...
... these types of events got rulers seriously concerned about their auspiciousness and possible consequences, so they even sought counsel for remedial measures. At this time, generally there was no clear distinction between astrology and astronomy, and superstition remained entwined with both. Many med ...
Sky and Telescope - CAMS
... expect that these will soon receive the label “established.” CAMS also picked up many previously unknown showers, and some were detected well enough to deserve “established” status right away. For example, six meteors with one ultra-compact radiant appeared within a few hours on February 4, 2011. Th ...
... expect that these will soon receive the label “established.” CAMS also picked up many previously unknown showers, and some were detected well enough to deserve “established” status right away. For example, six meteors with one ultra-compact radiant appeared within a few hours on February 4, 2011. Th ...
Evidence for a Distant Giant Planet in the Solar System
... that such a clustering has only a probability of 0.007% to be due to chance, thus requiring a dynamical origin. We find that the observed orbital alignment can be maintained by a distant eccentric planet with mass & 10 m⊕ whose orbit lies in approximately the same plane as those of the distant Kuipe ...
... that such a clustering has only a probability of 0.007% to be due to chance, thus requiring a dynamical origin. We find that the observed orbital alignment can be maintained by a distant eccentric planet with mass & 10 m⊕ whose orbit lies in approximately the same plane as those of the distant Kuipe ...
Evidence for a Distant Giant Planet in the Solar System
... that such a clustering has only a probability of 0.007% to be due to chance, thus requiring a dynamical origin. We find that the observed orbital alignment can be maintained by a distant eccentric planet with mass & 10 m⊕ whose orbit lies in approximately the same plane as those of the distant Kuipe ...
... that such a clustering has only a probability of 0.007% to be due to chance, thus requiring a dynamical origin. We find that the observed orbital alignment can be maintained by a distant eccentric planet with mass & 10 m⊕ whose orbit lies in approximately the same plane as those of the distant Kuipe ...
![[21.01] The Kuiper Belt Survey of the GEST Mission](http://s1.studyres.com/store/data/001994697_1-8c85c9f4b0ff584e7933ff3c4939de69-300x300.png)
[21.01] The Kuiper Belt Survey of the GEST Mission
... 1. About 30% of the known Kuiper Belt Objects (KBOs) are trapped in mean motion resonances with Neptune (these are the so-called Resonant KBOs; the non-resonant objects are known as Classical KBOs). One likely trapping mechanism involves radial migration of Neptune in response to torques exerted on ...
... 1. About 30% of the known Kuiper Belt Objects (KBOs) are trapped in mean motion resonances with Neptune (these are the so-called Resonant KBOs; the non-resonant objects are known as Classical KBOs). One likely trapping mechanism involves radial migration of Neptune in response to torques exerted on ...
Comet Ion Tails Purpose Introduction Materials
... approach as it appeared on 1996 March 26, the long ion and dust tails of Comet Hyakutake are visible flowing off to the left in front of a distant star field that includes both the Big and Little Dippers. On the far left, the blue ion tail appears to have recently undergone a magnetic disconnection ...
... approach as it appeared on 1996 March 26, the long ion and dust tails of Comet Hyakutake are visible flowing off to the left in front of a distant star field that includes both the Big and Little Dippers. On the far left, the blue ion tail appears to have recently undergone a magnetic disconnection ...
as PDF - Minnesota Academy of Science
... the right, with ten streamel'8, is a naked-eye view of the same comet, made also by Professor Bond, October 10, following. The drawing below on the right (3) represents the comet as seen five days earlier, while its head W88 passing the bright star, Arcturus, which we, have chosen al! the reference ...
... the right, with ten streamel'8, is a naked-eye view of the same comet, made also by Professor Bond, October 10, following. The drawing below on the right (3) represents the comet as seen five days earlier, while its head W88 passing the bright star, Arcturus, which we, have chosen al! the reference ...
THE VELOCITY DISTRIBUTION OF THE NEAREST
... The bulk flow velocity for the cluster of interstellar cloudlets within 30 pc of the Sun is determined from optical and ultraviolet absorption line data, after omitting from the sample stars with circumstellar disks or variable emission lines and the active variable HR 1099. A total of 96 velocity c ...
... The bulk flow velocity for the cluster of interstellar cloudlets within 30 pc of the Sun is determined from optical and ultraviolet absorption line data, after omitting from the sample stars with circumstellar disks or variable emission lines and the active variable HR 1099. A total of 96 velocity c ...
Impact of Protostellar Outflow on Star Formation: Effects of Initial
... observed in the star forming region (Arce et al. 2007; Bally et al. 2007). Such a jet also appears during star formation process, and is driven in very close proximity to the protostar (Tomisaka 2002; Banerjee & Pudritz 2006; Machida et al. 2008a,b). The driving source and its spatial scale of each ...
... observed in the star forming region (Arce et al. 2007; Bally et al. 2007). Such a jet also appears during star formation process, and is driven in very close proximity to the protostar (Tomisaka 2002; Banerjee & Pudritz 2006; Machida et al. 2008a,b). The driving source and its spatial scale of each ...
evidence for a distant giant planet in the solar system
... We estimate the statistical significance of the observed clustering by assuming that the detection biases for our clustered objects are similar to the detection biases for the collection of all objects with q>30 AU and a>50 AU. We then randomly select six objects from the sample 100,000 times and ...
... We estimate the statistical significance of the observed clustering by assuming that the detection biases for our clustered objects are similar to the detection biases for the collection of all objects with q>30 AU and a>50 AU. We then randomly select six objects from the sample 100,000 times and ...
teach with space
... Belt, a disc-like collection of frozen remnants from the formation of the Solar System just beyond the orbit of Neptune. Long period comets (those with orbital periods of up to tens of thousands of years) are thought to originate from a spherical halo of icy material towards the edge of our Solar Sy ...
... Belt, a disc-like collection of frozen remnants from the formation of the Solar System just beyond the orbit of Neptune. Long period comets (those with orbital periods of up to tens of thousands of years) are thought to originate from a spherical halo of icy material towards the edge of our Solar Sy ...
teach with space
... Belt, a disc-like collection of frozen remnants from the formation of the Solar System just beyond the orbit of Neptune. Long period comets (those with orbital periods of up to tens of thousands of years) are thought to originate from a spherical halo of icy material towards the edge of our Solar Sy ...
... Belt, a disc-like collection of frozen remnants from the formation of the Solar System just beyond the orbit of Neptune. Long period comets (those with orbital periods of up to tens of thousands of years) are thought to originate from a spherical halo of icy material towards the edge of our Solar Sy ...
Beyond Pluto: Exploring the outer limits of the solar - e
... composition of comets, Kuiper suggested that during the formation of the planets many thousands of kilometre-sized ‘snowballs’ might have been formed in a disc beyond the planet Neptune. Like Edgeworth, Kuiper reasoned that at such great distances from the Sun, where the relatively tiny snowballs wo ...
... composition of comets, Kuiper suggested that during the formation of the planets many thousands of kilometre-sized ‘snowballs’ might have been formed in a disc beyond the planet Neptune. Like Edgeworth, Kuiper reasoned that at such great distances from the Sun, where the relatively tiny snowballs wo ...
sections 19-22 instructor notes
... for a flat rotation curve. As noted by Kerr & Lynden-Bell, many studies of the ratio give values for (σΘ/σΠ)2 very close to 0.5, with typical values ranging from 0.36 to 0.50, and with late-type giants (representing a dynamically relaxed system) giving values of 0.49 to 0.50, closest to the result p ...
... for a flat rotation curve. As noted by Kerr & Lynden-Bell, many studies of the ratio give values for (σΘ/σΠ)2 very close to 0.5, with typical values ranging from 0.36 to 0.50, and with late-type giants (representing a dynamically relaxed system) giving values of 0.49 to 0.50, closest to the result p ...
sections 19-22 instructor notes
... for a flat rotation curve. As noted by Kerr & Lynden-Bell, many studies of the ratio give values for (σΘ/σΠ)2 very close to 0.5, with typical values ranging from 0.36 to 0.50, and with late-type giants (representing a dynamically relaxed system) giving values of 0.49 to 0.50, closest to the result p ...
... for a flat rotation curve. As noted by Kerr & Lynden-Bell, many studies of the ratio give values for (σΘ/σΠ)2 very close to 0.5, with typical values ranging from 0.36 to 0.50, and with late-type giants (representing a dynamically relaxed system) giving values of 0.49 to 0.50, closest to the result p ...
Uranus and Neptune Uranus Saturn Neptune
... anger among men. At the wedding of Peleus and Thetis all the gods were invited with the exception of Eris, and, enraged at her exclusion, she spitefully caused a quarrel among the goddesses that led to the Trojan war. ...
... anger among men. At the wedding of Peleus and Thetis all the gods were invited with the exception of Eris, and, enraged at her exclusion, she spitefully caused a quarrel among the goddesses that led to the Trojan war. ...
Star Formation in the Rosette Complex
... ship for a total of 30 cluster sources and to extend the list of known PMS candidates to 21. They subsequently identified members coincident with ROSAT point source catalogs and compared their properties to the rest of the sample. Six of the PMS candidates were confirmed as X-ray sources. In Figure ...
... ship for a total of 30 cluster sources and to extend the list of known PMS candidates to 21. They subsequently identified members coincident with ROSAT point source catalogs and compared their properties to the rest of the sample. Six of the PMS candidates were confirmed as X-ray sources. In Figure ...
Presolar Cloud Collapse and the Formation and Early Evolution of
... ambipolar diffusion controls the cloud’s dynamics (Mouschovias, 1991). Ambipolar diffusion is the process of slippage of the primarily neutral gas molecules past the ions, to which the magnetic field lines are effectively attached. This process occurs over timescales of a few million years or more f ...
... ambipolar diffusion controls the cloud’s dynamics (Mouschovias, 1991). Ambipolar diffusion is the process of slippage of the primarily neutral gas molecules past the ions, to which the magnetic field lines are effectively attached. This process occurs over timescales of a few million years or more f ...
The Solar System Beyond The Planets
... satellites. The first satellite is on a near circular orbit at 49,500km from 2003 EL61 . Preliminary results (Brown et al., 2005c) show that the orbital period of the system is ∼49 days and the satellite brightness is 6% of 2003 EL61 (for reference, Pluto-Charon has an orbital period of 6.4 days and ...
... satellites. The first satellite is on a near circular orbit at 49,500km from 2003 EL61 . Preliminary results (Brown et al., 2005c) show that the orbital period of the system is ∼49 days and the satellite brightness is 6% of 2003 EL61 (for reference, Pluto-Charon has an orbital period of 6.4 days and ...
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.