1 Astrobiologically Interesting Stars within 10
... The stellar Galactic orbit is a rarely mentioned factor of stability which is drawing more interest as one regards how important it may be concerning the average interval between global catastrophes that a planet may undergo. The Sun lies very near the so-called co-rotation radius (Balázs, 2000, Lép ...
... The stellar Galactic orbit is a rarely mentioned factor of stability which is drawing more interest as one regards how important it may be concerning the average interval between global catastrophes that a planet may undergo. The Sun lies very near the so-called co-rotation radius (Balázs, 2000, Lép ...
Resonant Origins for Pluto`s High Inclination
... force to prevent their return. As a result, Saturn, Uranus, and Neptune preferentially scattered inward while Jupiter preferentially scattered outward. The momentum-conserving recoils from this scattering caused Saturn, Uranus, and Neptune to migrate significant distances outward while Jupiter migra ...
... force to prevent their return. As a result, Saturn, Uranus, and Neptune preferentially scattered inward while Jupiter preferentially scattered outward. The momentum-conserving recoils from this scattering caused Saturn, Uranus, and Neptune to migrate significant distances outward while Jupiter migra ...
Star Map - Science Centre
... The Big Dipper is one of the most famous asterisms (star patterns) throughout history. In some places of the Northern Hemisphere, its seven brightest stars can be seen all year round. Further South near the equator, it is only visible for a few months. Merak and Dubhe are known as The Pointers, poin ...
... The Big Dipper is one of the most famous asterisms (star patterns) throughout history. In some places of the Northern Hemisphere, its seven brightest stars can be seen all year round. Further South near the equator, it is only visible for a few months. Merak and Dubhe are known as The Pointers, poin ...
Finding KBO Flyby Targets for New Horizons
... We also considered the benefits of adjusting the Pluto encounter time to improve our ability to reach a particular KBO. Flexibility in encounter date increases the number of potential KBO targets, because Keplerian shear effectively tilts the cone of accessibility relative to Pluto and the KBO popul ...
... We also considered the benefits of adjusting the Pluto encounter time to improve our ability to reach a particular KBO. Flexibility in encounter date increases the number of potential KBO targets, because Keplerian shear effectively tilts the cone of accessibility relative to Pluto and the KBO popul ...
silicon and oxygen abundances in planet-host stars
... of various other metals are enhanced in these stars compared to stars with no known planets. This comes as no surprise, however, given the known positive correlation between host star iron abundance and planet detection rate. Since planet hosts are found to have higher overall iron content (which se ...
... of various other metals are enhanced in these stars compared to stars with no known planets. This comes as no surprise, however, given the known positive correlation between host star iron abundance and planet detection rate. Since planet hosts are found to have higher overall iron content (which se ...
B LOG - Science Centre
... A loose grouping of stars next to the bright star of Aldebaran. One of the closest star clusters to the Sun (150 light years away). Requires binoculars. ...
... A loose grouping of stars next to the bright star of Aldebaran. One of the closest star clusters to the Sun (150 light years away). Requires binoculars. ...
Untitled
... placed entirely on the near side of the Sun. But Galileo's telescopic observation of Venus's orbit around the Sun made this Ptolemaic astronomical model invalid and it is believed that this crucial finding ...
... placed entirely on the near side of the Sun. But Galileo's telescopic observation of Venus's orbit around the Sun made this Ptolemaic astronomical model invalid and it is believed that this crucial finding ...
The Neptune Trojans – a new source for the
... asteroids, and that the Trojans may outnumber the asteroids by an order of magnitude, or more (Sheppard & Trujillo 2006). As such, it is likely that any dynamically unstable component to Neptune’s Trojan population would initially have numbered at least as many objects as their stable counterparts, ...
... asteroids, and that the Trojans may outnumber the asteroids by an order of magnitude, or more (Sheppard & Trujillo 2006). As such, it is likely that any dynamically unstable component to Neptune’s Trojan population would initially have numbered at least as many objects as their stable counterparts, ...
Lecture 13.1
... experimental observations 3. Square of orbital period is proportional to cube of semimajor axis. • Deduce ( for circular orbit) from gravitational law • assume gravity responsible for acceleration in orbit GMSM/r2 = M(2pr/T)2/r T2 = (4p2/GMS)r3 !! Physics 215 – Fall 2014 ...
... experimental observations 3. Square of orbital period is proportional to cube of semimajor axis. • Deduce ( for circular orbit) from gravitational law • assume gravity responsible for acceleration in orbit GMSM/r2 = M(2pr/T)2/r T2 = (4p2/GMS)r3 !! Physics 215 – Fall 2014 ...
White dwarfs from GAIA: The 7th dimension
... The higher Balmer lines carry most of the information on log g Therefore, we would propose to cover a spectral range 3800-6800 Å with λ/∆λ≈5000. This will also allow the measurement of Ca H+K (seen e.g. in DAZ) ...
... The higher Balmer lines carry most of the information on log g Therefore, we would propose to cover a spectral range 3800-6800 Å with λ/∆λ≈5000. This will also allow the measurement of Ca H+K (seen e.g. in DAZ) ...
Solar System evolution from compositional mapping of the
... (1459) Magnya, a basaltic fragment discovered among the cold, bluish bodies14. Then, a handful more of these rogue igneous asteroids were found dispersed across the main belt16,28,29. Iron asteroids present in the main belt should have formed much closer to the Sun15. Primitive asteroids were discov ...
... (1459) Magnya, a basaltic fragment discovered among the cold, bluish bodies14. Then, a handful more of these rogue igneous asteroids were found dispersed across the main belt16,28,29. Iron asteroids present in the main belt should have formed much closer to the Sun15. Primitive asteroids were discov ...
The Moon, Planets and Polaris
... There’s not much to add. The sights are all straightforward and the differences between the planets and the moon essentially lie with the corrections applied to the sextant altitude. Both use the AP3270 Vol 3 tables to calculate an intercept and azimuth. Polaris is slightly different because it lead ...
... There’s not much to add. The sights are all straightforward and the differences between the planets and the moon essentially lie with the corrections applied to the sextant altitude. Both use the AP3270 Vol 3 tables to calculate an intercept and azimuth. Polaris is slightly different because it lead ...
The escape of planetary atmospheres
... [Kevin Zahnle], together with Kasting, subsequently showed that such escape would also have dragged along much of the oxygen. Meanwhile, heavier carbon dioxide would have remained behind. Without water to mediate the chemistry that turns carbon dioxide into carbonate minerals, Venus is left with all ...
... [Kevin Zahnle], together with Kasting, subsequently showed that such escape would also have dragged along much of the oxygen. Meanwhile, heavier carbon dioxide would have remained behind. Without water to mediate the chemistry that turns carbon dioxide into carbonate minerals, Venus is left with all ...
The attractive force of gravity between two
... Newton’s law of gravitation states that there is a force between every pair of particles, of any mass, in the universe. This force is called the gravitational force, and it causes objects to attract one another. The force does not require direct contact. The Earth attracts the Sun, and the Sun attra ...
... Newton’s law of gravitation states that there is a force between every pair of particles, of any mass, in the universe. This force is called the gravitational force, and it causes objects to attract one another. The force does not require direct contact. The Earth attracts the Sun, and the Sun attra ...
A Bayesian method for the detection of planetary transits
... Of course, such a possibility only arises in the eventuality that the observer’s line of sight lies within the orbital plane of the planet. The probability for this to occur is, under the geometrical assumption, simply given by the star over planet radius ratio (0.0025 for the Sun-Jupiter system). T ...
... Of course, such a possibility only arises in the eventuality that the observer’s line of sight lies within the orbital plane of the planet. The probability for this to occur is, under the geometrical assumption, simply given by the star over planet radius ratio (0.0025 for the Sun-Jupiter system). T ...
PPT
... – Problem 5, HW 1 is a good starting point for the lab questions – Note typo in Question 3 - “Jupiter” => “Saturn” ...
... – Problem 5, HW 1 is a good starting point for the lab questions – Note typo in Question 3 - “Jupiter” => “Saturn” ...
Behaviour of elements from lithium to europium in stars with and
... that the iron abundance log A(Fe) obtained from Fe I lines was not correlated with the equivalent width, EW. The adopted metallicity value [Fe/H] was the iron abundance obtained from the Fe I lines under the local thermodynamic equilibrium (LTE) approximation. We note that the non-LTE corrections fo ...
... that the iron abundance log A(Fe) obtained from Fe I lines was not correlated with the equivalent width, EW. The adopted metallicity value [Fe/H] was the iron abundance obtained from the Fe I lines under the local thermodynamic equilibrium (LTE) approximation. We note that the non-LTE corrections fo ...
Superstars of Astronomy: Debra Fischer transcript
... Well, I think it was probably the first astronomy class that I took when I was in college. It was sort of unsettling. I remember feeling how insignificant it seemed that the Earth was in the context of the entire, well, galaxy and then the entire universe beyond that. So the scope of things was almo ...
... Well, I think it was probably the first astronomy class that I took when I was in college. It was sort of unsettling. I remember feeling how insignificant it seemed that the Earth was in the context of the entire, well, galaxy and then the entire universe beyond that. So the scope of things was almo ...
Planet Hunters: The First Two Planet Candidates Identified by the
... that six of the ten were unlikely to be planet candidates. KIC 11904734 has a V-shaped transit and very large radius, suggesting an eclipsing binary star system. KIC 8043052 and KIC 12009347 have secondary occultations that are also consistent with eclipsing binary systems. KIC 4913000 and KIC 90978 ...
... that six of the ten were unlikely to be planet candidates. KIC 11904734 has a V-shaped transit and very large radius, suggesting an eclipsing binary star system. KIC 8043052 and KIC 12009347 have secondary occultations that are also consistent with eclipsing binary systems. KIC 4913000 and KIC 90978 ...
Astronomical Facts `n Stuff
... Observed every day from the same location at the same time, the Sun follows a figure-of-eight path through the sky. Known as an analemma, this pattern is due to the tilt of the Earth’s axis as it orbits the Sun. ...
... Observed every day from the same location at the same time, the Sun follows a figure-of-eight path through the sky. Known as an analemma, this pattern is due to the tilt of the Earth’s axis as it orbits the Sun. ...
TOPS: Toward Other Planetary
... more or less contemporaneously through a sequence of related and almost deterministic events, as the interior of a spinning interstellar cloud collapses under the influence of its own gravity. The spin of the collapsing matter forces some of the material to whirl about the center in a thin, disk-sha ...
... more or less contemporaneously through a sequence of related and almost deterministic events, as the interior of a spinning interstellar cloud collapses under the influence of its own gravity. The spin of the collapsing matter forces some of the material to whirl about the center in a thin, disk-sha ...
oC - geogreenapps
... learner has a set of tA, . . . flllJfM in hie text-book, and can, ther. fore, pursue biB .tueliea either with or without the large maps, acCOl'Ging to circumstance& Tb"e text, however, bu not been altered; .. that the book is still perfectly adapted to the large mapa, and CaD be uaed with former edi ...
... learner has a set of tA, . . . flllJfM in hie text-book, and can, ther. fore, pursue biB .tueliea either with or without the large maps, acCOl'Ging to circumstance& Tb"e text, however, bu not been altered; .. that the book is still perfectly adapted to the large mapa, and CaD be uaed with former edi ...
What did we learn from transiting planets?
... Department of Astrophysical Sciences --- Princeton University ...
... Department of Astrophysical Sciences --- Princeton University ...
Definition of planet
The definition of planet, since the word was coined by the ancient Greeks, has included within its scope a wide range of celestial bodies. Greek astronomers employed the term asteres planetai (ἀστέρες πλανῆται), ""wandering stars"", for star-like objects which apparently moved over the sky. Over the millennia, the term has included a variety of different objects, from the Sun and the Moon to satellites and asteroids.By the end of the 19th century the word planet, though it had yet to be defined, had become a working term applied only to a small set of objects in the Solar System. After 1992, however, astronomers began to discover many additional objects beyond the orbit of Neptune, as well as hundreds of objects orbiting other stars. These discoveries not only increased the number of potential planets, but also expanded their variety and peculiarity. Some were nearly large enough to be stars, while others were smaller than Earth's moon. These discoveries challenged long-perceived notions of what a planet could be.The issue of a clear definition for planet came to a head in 2005 with the discovery of the trans-Neptunian object Eris, a body more massive than the smallest then-accepted planet, Pluto. In its 2006 response, the International Astronomical Union (IAU), recognised by astronomers as the world body responsible for resolving issues of nomenclature, released its decision on the matter. This definition, which applies only to the Solar System, states that a planet is a body that orbits the Sun, is massive enough for its own gravity to make it round, and has ""cleared its neighbourhood"" of smaller objects around its orbit. Under this new definition, Pluto and the other trans-Neptunian objects do not qualify as planets. The IAU's decision has not resolved all controversies, and while many scientists have accepted the definition, some in the astronomical community have rejected it outright.