Astronomical Circumstances
... This DRAFT document is an excerpt from Principles of Planetary Biology, by Tom E. Morris. based on their brightness (magnitude), temperature, receive each moment, so the warmer the planet will get radius, luminosity, mix of colors (spectral class), and (all other things being equal). This being the ...
... This DRAFT document is an excerpt from Principles of Planetary Biology, by Tom E. Morris. based on their brightness (magnitude), temperature, receive each moment, so the warmer the planet will get radius, luminosity, mix of colors (spectral class), and (all other things being equal). This being the ...
Astrometric accuracy during the past 2000 years
... sqrt(10) because nothing else is available, but this “internal catalogue error” is not given in the catalogue, and it is certainly too small because of the unknown systematic errors. The three tables should ideally contain the “external errors” of a catalogue entry as would be obtained from a compar ...
... sqrt(10) because nothing else is available, but this “internal catalogue error” is not given in the catalogue, and it is certainly too small because of the unknown systematic errors. The three tables should ideally contain the “external errors” of a catalogue entry as would be obtained from a compar ...
to - NexStar Resource Site
... Although Galileo was the first to observe it with a telescope in 1610, Saturn has been known since prehistoric times. Up to 1977 Saturn was believed to be the only planet with a ring system. It was later discovered that all of the gas planets had ring systems, albeit faint, of their own. Saturn is a ...
... Although Galileo was the first to observe it with a telescope in 1610, Saturn has been known since prehistoric times. Up to 1977 Saturn was believed to be the only planet with a ring system. It was later discovered that all of the gas planets had ring systems, albeit faint, of their own. Saturn is a ...
Period analysis of variable stars by robust smoothing
... where the φ∗i (p) are the ordered phase values. Stellingwerf (1978) proposed another method based on a measure of dispersion, called phase dispersion minimization (PDM). In this method, the period is chosen to minimize the residual sum of squares (RSS) of the one way analysis of variance, after the ...
... where the φ∗i (p) are the ordered phase values. Stellingwerf (1978) proposed another method based on a measure of dispersion, called phase dispersion minimization (PDM). In this method, the period is chosen to minimize the residual sum of squares (RSS) of the one way analysis of variance, after the ...
The SMC as a probe of dust in the early Universe
... We will expand this sample in order to search for dependencies of dust properties with metallicity. We are also observing two luminous blue variables to compare to similar objects in the LMC which show strong crystalline silicate features in their spectra (Kastner et al. 2006). Finally, we will exam ...
... We will expand this sample in order to search for dependencies of dust properties with metallicity. We are also observing two luminous blue variables to compare to similar objects in the LMC which show strong crystalline silicate features in their spectra (Kastner et al. 2006). Finally, we will exam ...
Scientific Requirements for Basic Angle Stability and Monitoring
... observed by Gaia down to 20th magnitude, 75% are fainter than 19th mag, 21% between 19th and 18th mag, and only 4% brighter than 18th mag. Potentially, they could jointly define the parallax zero point to an accuracy of about 0.2 µas. However, even a small fraction of contaminating stars could upset ...
... observed by Gaia down to 20th magnitude, 75% are fainter than 19th mag, 21% between 19th and 18th mag, and only 4% brighter than 18th mag. Potentially, they could jointly define the parallax zero point to an accuracy of about 0.2 µas. However, even a small fraction of contaminating stars could upset ...
Astro Review - Parkway C-2
... ANS: a spherical shell around the solar system formed by comets with long orbital periods ANS: They burn up. ANS: the study of the properties of light that depend on wavelength ANS: convection ANS: 11 ANS: During nuclear fusion, four hydrogen nuclei combine to form one helium nucleus. ANS: temperatu ...
... ANS: a spherical shell around the solar system formed by comets with long orbital periods ANS: They burn up. ANS: the study of the properties of light that depend on wavelength ANS: convection ANS: 11 ANS: During nuclear fusion, four hydrogen nuclei combine to form one helium nucleus. ANS: temperatu ...
the evolution of planetary systems with time
... and sensitive dependence on the initial conditions (chaos). Additional complications arise from additional forces that are often present: During early stages of evolution, circumstellar disks provide torques that influence orbital elements, and turbulent fluctuations act on young planets. Over longe ...
... and sensitive dependence on the initial conditions (chaos). Additional complications arise from additional forces that are often present: During early stages of evolution, circumstellar disks provide torques that influence orbital elements, and turbulent fluctuations act on young planets. Over longe ...
Variations in the Star Formation Efficiency of the Dense Molecular
... being higher in the high surface density, highly molecular parts of galaxies. At the same time, the IR-to-HCN ratio (closely related to the star formation efficiency of dense molecular gas) decreases systematically with these same parameters and is ∼ 6 − 8 times lower near galaxy centers than in the ...
... being higher in the high surface density, highly molecular parts of galaxies. At the same time, the IR-to-HCN ratio (closely related to the star formation efficiency of dense molecular gas) decreases systematically with these same parameters and is ∼ 6 − 8 times lower near galaxy centers than in the ...
Consistent metallicity scale for cool dwarfs and giants
... Aims. It is therefore crucial to understand whether the metallicity or abundance differences among dwarfs and giants are real or are produced by systematic errors in the analysis. We aim to ascertain a methodology capable of producing a consistent metallicity scale for giants and dwarfs. Methods. To ...
... Aims. It is therefore crucial to understand whether the metallicity or abundance differences among dwarfs and giants are real or are produced by systematic errors in the analysis. We aim to ascertain a methodology capable of producing a consistent metallicity scale for giants and dwarfs. Methods. To ...
Abiotic formation of O $\ mathsf {_2} $ and O $\ mathsf {_3} $ in high
... Both of the “false positives” mentioned above apply to planets that lie outside of the liquid water habitable zone around their parent star. The boundaries of this zone can be estimated to first order from climate models (Kasting et al. 1993), and it should be possible to determine observationally w ...
... Both of the “false positives” mentioned above apply to planets that lie outside of the liquid water habitable zone around their parent star. The boundaries of this zone can be estimated to first order from climate models (Kasting et al. 1993), and it should be possible to determine observationally w ...
PHY216_lect3_2014_sub
... 3. Height above sea level Observer's height above sea level means that the observed horizon is lower on the celestial sphere, so the star's apparent elevation increases. ...
... 3. Height above sea level Observer's height above sea level means that the observed horizon is lower on the celestial sphere, so the star's apparent elevation increases. ...
How to Build an Astrolabe - St John`s College, Cambridge
... * the earth is not a perfect sphere and does not move perfectly regularly through the sky. This means that the astrolabe, which does not incorporate all of these eccentricities, cannot be a truly accurate model. It will become less accurate over time as the earth’s position relative to the stars shi ...
... * the earth is not a perfect sphere and does not move perfectly regularly through the sky. This means that the astrolabe, which does not incorporate all of these eccentricities, cannot be a truly accurate model. It will become less accurate over time as the earth’s position relative to the stars shi ...
Gas Mass Fractions and the Evolution of Spiral Galaxies
... We show that the gas mass fraction of spiral galaxies is strongly correlated with luminosity and surface brightness. It is not correlated with linear size. Gas fraction varies with luminosity and surface brightness at the same rate, indicating evolution at fixed size. Dim galaxies are clearly less e ...
... We show that the gas mass fraction of spiral galaxies is strongly correlated with luminosity and surface brightness. It is not correlated with linear size. Gas fraction varies with luminosity and surface brightness at the same rate, indicating evolution at fixed size. Dim galaxies are clearly less e ...
How to Build an Astrolabe
... * the earth is not a perfect sphere and does not move perfectly regularly through the sky. This means that the astrolabe, which does not incorporate all of these eccentricities, cannot be a truly accurate model. It will become less accurate over time as the earth’s position relative to the stars shi ...
... * the earth is not a perfect sphere and does not move perfectly regularly through the sky. This means that the astrolabe, which does not incorporate all of these eccentricities, cannot be a truly accurate model. It will become less accurate over time as the earth’s position relative to the stars shi ...
TWO NEW LONG-PERIOD GIANT PLANETS FROM THE
... Moutou et al. 2015). An example of a Jupiter-analog planet orbiting a solar twin is presented in Bedell et al. (2015). While the Kepler mission has revolutionized exoplanetary science and provided a first estimate of the frequency of Earth-size planets in Earth-like orbits, long-term RV surveys compl ...
... Moutou et al. 2015). An example of a Jupiter-analog planet orbiting a solar twin is presented in Bedell et al. (2015). While the Kepler mission has revolutionized exoplanetary science and provided a first estimate of the frequency of Earth-size planets in Earth-like orbits, long-term RV surveys compl ...
13.1 Galaxy Evolution: Introduction
... spirals. In more modern renderings, you can plot colors as a function of intrinsic luminosity, and you still see those same two blobs, but they're a little tilted. In the case of elliptical galaxies, that ridge line is really mass-metalicity relation. The more luminous ellipticals ...
... spirals. In more modern renderings, you can plot colors as a function of intrinsic luminosity, and you still see those same two blobs, but they're a little tilted. In the case of elliptical galaxies, that ridge line is really mass-metalicity relation. The more luminous ellipticals ...
Sidereus Nuncius (Print Translation)
... as I saw their huge number I began to think of, and at last discovered, a method whereby I could measure the distances between them. In this matter, it behooves all those who wish to make such observations to be forewarned. For it is necessary first that they prepare a most accurate glass that shows ...
... as I saw their huge number I began to think of, and at last discovered, a method whereby I could measure the distances between them. In this matter, it behooves all those who wish to make such observations to be forewarned. For it is necessary first that they prepare a most accurate glass that shows ...
RApid Temporal Survey-RATS I: Overview and first results
... sky transparency) – this was done for all the images of the field. In total around 33000 stars were detected in our survey which covered a total of 3 square degrees. All the resulting light curves were analysed and those which had bad magnitude values or errors above 0.1 mag or non-detections in any ...
... sky transparency) – this was done for all the images of the field. In total around 33000 stars were detected in our survey which covered a total of 3 square degrees. All the resulting light curves were analysed and those which had bad magnitude values or errors above 0.1 mag or non-detections in any ...
R136a1
RMC 136a1 (usually abbreviated to R136a1) is a Wolf-Rayet star located at the center of R136, the central condensation of stars of the large NGC 2070 open cluster in the Tarantula Nebula. It lies at a distance of about 50 kiloparsecs (163,000 light-years) in the Large Magellanic Cloud. It has the highest mass and luminosity of any known star, at 265 M☉ and 8.7 million L☉, and also one of the hottest at over 50,000 K.