Kepler423b: a half-Jupiter mass planet transiting a very old solar
... M? = 0.85 ± 0.04 M , R? = 0.95 ± 0.04 R , T eff = 5560 ± 80 K, [M/H]=−0.10±0.05 dex, and with an age of 11 ± 2 Gyr. The planet Kepler-423b has a mass of M p = 0.595 ± 0.081 MJup and a radius of Rp = 1.192 ± 0.052 RJup , yielding a planetary bulk density of ρp = 0.459 ± 0.083 g cm−3 . The radius of ...
... M? = 0.85 ± 0.04 M , R? = 0.95 ± 0.04 R , T eff = 5560 ± 80 K, [M/H]=−0.10±0.05 dex, and with an age of 11 ± 2 Gyr. The planet Kepler-423b has a mass of M p = 0.595 ± 0.081 MJup and a radius of Rp = 1.192 ± 0.052 RJup , yielding a planetary bulk density of ρp = 0.459 ± 0.083 g cm−3 . The radius of ...
Spectral Matching for Elemental Abundances of Evolved Stars of Globular Clusters
... k-means clustering using two groups of ω Cen stars. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . k-means clustering using three groups for Marino et al. (2012) results of ω Cen stars. . . . . . . . . . . k-means clustering using three groups for the 221-star set of ω Cen stars. . . . . ...
... k-means clustering using two groups of ω Cen stars. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . k-means clustering using three groups for Marino et al. (2012) results of ω Cen stars. . . . . . . . . . . k-means clustering using three groups for the 221-star set of ω Cen stars. . . . . ...
The Official Magazine of the University Of St Andrews Astronomical Society 1
... The results were astounding; a few of the flares were 10 Million kilometers long – about 18 stellar radii from the star. In comparison, the sun’s flares are about only 1 solar radius in length. Most of the flares, however, were much shorter and like the sun’s. At this stage in the stars’ lives the s ...
... The results were astounding; a few of the flares were 10 Million kilometers long – about 18 stellar radii from the star. In comparison, the sun’s flares are about only 1 solar radius in length. Most of the flares, however, were much shorter and like the sun’s. At this stage in the stars’ lives the s ...
Controlling a Three Meter Mirror Array Reflector to Track Stars
... Communicating with the servos and encoders is done through a TCP/IP connection to each serial port on the ethernet serial server connected to the devices. Entering the serial server's local IP address and the serial's port number is all that is required for addressing. All of the specific port setti ...
... Communicating with the servos and encoders is done through a TCP/IP connection to each serial port on the ethernet serial server connected to the devices. Entering the serial server's local IP address and the serial's port number is all that is required for addressing. All of the specific port setti ...
Star Clusters - Caltech Astronomy
... diagrams of two clusters will in general have the same shape, but will be shifted in magnitude by an amount equal to the difference in distance modulus between the two. There may also be additional shifts in magnitude and color index resulting from interstellar absorption. The general procedure is t ...
... diagrams of two clusters will in general have the same shape, but will be shifted in magnitude by an amount equal to the difference in distance modulus between the two. There may also be additional shifts in magnitude and color index resulting from interstellar absorption. The general procedure is t ...
A Search for Exozodiacal Dust and Faint Companions near Sirius
... We have begun to search for disks that are too faint to be detected photometrically by spatially resolving the critical regions less than 10 AU from nearby stars. Coronagraphic images can also reveal faint companions to nearby stars. Such companions can go undetected by radial velocity surveys becau ...
... We have begun to search for disks that are too faint to be detected photometrically by spatially resolving the critical regions less than 10 AU from nearby stars. Coronagraphic images can also reveal faint companions to nearby stars. Such companions can go undetected by radial velocity surveys becau ...
Telescopes
... is located in a naturally occurring sinkhole that formed when water flowing underground dissolved the limestone rock. If this telescope were not supported by the ground, it would collapse under its own weight. Since the telescope is set into the ground it cannot be aimed to different parts of the sk ...
... is located in a naturally occurring sinkhole that formed when water flowing underground dissolved the limestone rock. If this telescope were not supported by the ground, it would collapse under its own weight. Since the telescope is set into the ground it cannot be aimed to different parts of the sk ...
Polaris
... The North Star or Pole Star – aka Polaris – is famous for holding nearly still in our sky while the entire northern sky moves around it. That’s because it’s located nearly at the north celestial pole, the point around which the entire northern sky turns. Polaris marks the way due north. As you face ...
... The North Star or Pole Star – aka Polaris – is famous for holding nearly still in our sky while the entire northern sky moves around it. That’s because it’s located nearly at the north celestial pole, the point around which the entire northern sky turns. Polaris marks the way due north. As you face ...
dark matter - University of Texas Astronomy Home Page
... If mass is evenly distributed in a disk, the only mass that matters in determining the orbit of a given planet is the interior mass. ...
... If mass is evenly distributed in a disk, the only mass that matters in determining the orbit of a given planet is the interior mass. ...
Extrasolar Planets: An Amateur`s Search
... accurate data on a set of random stars which act as a control set in each of the following descriptions. In each subsection, with the exception of the distance section, the respective distributions for an individual factor by distribution set is introduced and compared across the other distributions ...
... accurate data on a set of random stars which act as a control set in each of the following descriptions. In each subsection, with the exception of the distance section, the respective distributions for an individual factor by distribution set is introduced and compared across the other distributions ...
Survey of Object-Based Data Reduction Techniques in
... fication of galaxies from SDSS (Sloan Digital Sky Survey) where PCA was not only used for feature extraction but also obtaining 2D plots [36]. Besides dimensionality reduction PCA has been also used, for instance, to study the importance of features present in the Hipparcos catalog [21]. Kernel PCA ...
... fication of galaxies from SDSS (Sloan Digital Sky Survey) where PCA was not only used for feature extraction but also obtaining 2D plots [36]. Besides dimensionality reduction PCA has been also used, for instance, to study the importance of features present in the Hipparcos catalog [21]. Kernel PCA ...
The Submillimeter Frontier: A Space Science Imperative
... high pressures and outflows from small galaxies with insufficient gravity to retain the debris. Gas liberated from the galaxies by collisions is heated and radiates X-rays. Deep potential wells form in clusters and gravitational lenses allow far IR measurements of even more distant objects. SIRTF wi ...
... high pressures and outflows from small galaxies with insufficient gravity to retain the debris. Gas liberated from the galaxies by collisions is heated and radiates X-rays. Deep potential wells form in clusters and gravitational lenses allow far IR measurements of even more distant objects. SIRTF wi ...
Folie 1
... Young stars are fainter than expected Young stars accrete not enough material T-Tauri accretion rates are 10-7MSUN/yr or lower.... it would take 10 million years to assemble the Sun ...
... Young stars are fainter than expected Young stars accrete not enough material T-Tauri accretion rates are 10-7MSUN/yr or lower.... it would take 10 million years to assemble the Sun ...
Video Lesson Information Astronomy: Observations & Theories Astronomy 1
... Using Earth as the archetypical example, this lesson details the stages of differentiation, cratering, flooding, and surface evolution. The impact of plate tectonics is presented as the formation and evolution of Earth is detailed. Comparisons are continuously made to the other terrestrial planets. ...
... Using Earth as the archetypical example, this lesson details the stages of differentiation, cratering, flooding, and surface evolution. The impact of plate tectonics is presented as the formation and evolution of Earth is detailed. Comparisons are continuously made to the other terrestrial planets. ...
Staring Back to Cosmic Dawn - UC-HiPACC
... the human population as a whole by studying carefully selected samples of a small number of individuals, we chose the five target areas because they’re physically representative of the universe at large. 20 June 2014 sky & telescope ...
... the human population as a whole by studying carefully selected samples of a small number of individuals, we chose the five target areas because they’re physically representative of the universe at large. 20 June 2014 sky & telescope ...
The Milky Way disk
... Abstract / This review summarises the invited presentation I gave on the Milky Way disc. The idea underneath was to touch those topics that can be considered hot nowadays in the Galactic disk research: the reality of the thick disk, the spiral structure of the Milky Way, and the properties of the ou ...
... Abstract / This review summarises the invited presentation I gave on the Milky Way disc. The idea underneath was to touch those topics that can be considered hot nowadays in the Galactic disk research: the reality of the thick disk, the spiral structure of the Milky Way, and the properties of the ou ...
MEarth
... 3. The small radii of M dwarfs lead to much deeper transits. The 2 R⊕ planet would eclipse 0.5% of an M5’s stellar disk area, but only 1 part in 3000 of that of the Sun. 4. The small masses of M dwarfs lead to larger induced radial-velocity variations. Taking a mass of 7 M ⊕ for the super-Earth (i ...
... 3. The small radii of M dwarfs lead to much deeper transits. The 2 R⊕ planet would eclipse 0.5% of an M5’s stellar disk area, but only 1 part in 3000 of that of the Sun. 4. The small masses of M dwarfs lead to larger induced radial-velocity variations. Taking a mass of 7 M ⊕ for the super-Earth (i ...
document
... • Years ago in ancient Egypt, archaeologists unearthed the tomb of the Apis-bulls and couldn’t believe what they had found. Leading to the tomb was a paved avenue lined by lions that were carved out of stone. To enter the tomb they had to walk through a long and high arched narrow passageway cut int ...
... • Years ago in ancient Egypt, archaeologists unearthed the tomb of the Apis-bulls and couldn’t believe what they had found. Leading to the tomb was a paved avenue lined by lions that were carved out of stone. To enter the tomb they had to walk through a long and high arched narrow passageway cut int ...
October 2016 BRAS Newsletter - The Baton Rouge Astronomical
... “This was the burst of the century!” exclaimed James A. Wren, an engineer at Los Alamos National Laboratory and coauthor of one of the papers. Indeed, GRB 130427A (as it is now called) was the most powerful gamma-ray burst and the secondbrightest optical flash measured in 18 years. The supernova det ...
... “This was the burst of the century!” exclaimed James A. Wren, an engineer at Los Alamos National Laboratory and coauthor of one of the papers. Indeed, GRB 130427A (as it is now called) was the most powerful gamma-ray burst and the secondbrightest optical flash measured in 18 years. The supernova det ...
Chandra Observation of Pulsar Wind Nebula
... The nonthermal X-ray most probably represents the interaction between the ejecta and a bulk of materials in the interior of the remnant, which is most likely between SN ejecta and the stripped envelop of the companion star. We obtained a stripped mass of ≤0.0083Mʘ,which is consistent with that o ...
... The nonthermal X-ray most probably represents the interaction between the ejecta and a bulk of materials in the interior of the remnant, which is most likely between SN ejecta and the stripped envelop of the companion star. We obtained a stripped mass of ≤0.0083Mʘ,which is consistent with that o ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.