Spacecraft Navigation Using X-Ray Pulsars
... and with their faint emissions, radio-based systems would require large antennas (on the order of 25 m in diameter or larger) to detect sources, which would be impractical for most spacecraft. Also, neighboring celestial objects including the sun, moon, Jupiter, and close stars, as well as distance ...
... and with their faint emissions, radio-based systems would require large antennas (on the order of 25 m in diameter or larger) to detect sources, which would be impractical for most spacecraft. Also, neighboring celestial objects including the sun, moon, Jupiter, and close stars, as well as distance ...
PH607lec08
... • E galaxies contain modest amounts of cool and warm gas, although not as much as is found in S galaxies. A few E galaxies have extended disks of neutral hydrogen. • X-ray observations indicate that many ellipticals contain 10^9 to 10^10 solar masses of gas at temperatures of ~10^7 K; this hot gas t ...
... • E galaxies contain modest amounts of cool and warm gas, although not as much as is found in S galaxies. A few E galaxies have extended disks of neutral hydrogen. • X-ray observations indicate that many ellipticals contain 10^9 to 10^10 solar masses of gas at temperatures of ~10^7 K; this hot gas t ...
Super-Earth and Sub-Neptune Exoplanets: a First Look from the
... I thank my advisor, David Charbonneau, for teaching me how to be an astronomer. I thank him for sharing his passion with me, for taking me seriously, for allowing me to learn, for inspiring me to wonder, for gently guiding me through the toughest times, and for helping me to establish confidence in ...
... I thank my advisor, David Charbonneau, for teaching me how to be an astronomer. I thank him for sharing his passion with me, for taking me seriously, for allowing me to learn, for inspiring me to wonder, for gently guiding me through the toughest times, and for helping me to establish confidence in ...
The quest for the size of the universe in early relativistic cosmology
... The first two pioneering and rival cosmological solutions of relativistic field equations, formulated in 1917 by Einstein and by de Sitter, were the main focus of interest during the early phase of relativistic cosmology. These solutions represented by their intention a static universe with finite c ...
... The first two pioneering and rival cosmological solutions of relativistic field equations, formulated in 1917 by Einstein and by de Sitter, were the main focus of interest during the early phase of relativistic cosmology. These solutions represented by their intention a static universe with finite c ...
The properties of a spectroscopically selected sample of cataclysmic variables Amornrat Aungwerojwit
... of cataclysmic variable (CV) evolution with relatively few modifications. The predictions made by this theory, however, are in strong disagreement with the observations. These discrepancies may, at least in part, be related to observational selection effects. In order to circumvent observational bia ...
... of cataclysmic variable (CV) evolution with relatively few modifications. The predictions made by this theory, however, are in strong disagreement with the observations. These discrepancies may, at least in part, be related to observational selection effects. In order to circumvent observational bia ...
- Isaac Newton Group of Telescopes
... heliocentric distance of 7.2 AU in July 1995. What was significant about this discovery was both the large distance at which it was discovered, and that it was already at an integrated magnitude of ∼10.5. To put this into context, at the same distance from the Sun Comet Halley was at V=22.8. This di ...
... heliocentric distance of 7.2 AU in July 1995. What was significant about this discovery was both the large distance at which it was discovered, and that it was already at an integrated magnitude of ∼10.5. To put this into context, at the same distance from the Sun Comet Halley was at V=22.8. This di ...
X-Ray Spectroscopy of Stars
... complementary results from EUVE will occasionally be mentioned. However, understanding cosmic sources cannot and should not be restricted to the use of spectroscopic data alone. Although spectroscopy provides unprecedented richness of physical information, complementary results from, e.g., X-ray pho ...
... complementary results from EUVE will occasionally be mentioned. However, understanding cosmic sources cannot and should not be restricted to the use of spectroscopic data alone. Although spectroscopy provides unprecedented richness of physical information, complementary results from, e.g., X-ray pho ...
lecture course
... These are probably quite shortlived, as they require enormous gas supplies. More common weaker AGNs like Seyfert galaxies, etc. are also found. Many of the most luminous AGNs are dust-enshrouded, particularly when they are very young and have just formed. AGNs have non-thermal spectra and so emit qu ...
... These are probably quite shortlived, as they require enormous gas supplies. More common weaker AGNs like Seyfert galaxies, etc. are also found. Many of the most luminous AGNs are dust-enshrouded, particularly when they are very young and have just formed. AGNs have non-thermal spectra and so emit qu ...
Multiwavelength observations of XTE J1118+480`s outburst
... 30% of sources detected by INTEGRAL/IBIS were not known. 80% of Norma sources are X-ray pulsars, high spin periods Spectra typical of neutron stars No radio emission 85% of sources are highly absorbed (X-ray observations): column density NH>1023 cm-2 X-ray absorption >> IR => absorbing matter local ...
... 30% of sources detected by INTEGRAL/IBIS were not known. 80% of Norma sources are X-ray pulsars, high spin periods Spectra typical of neutron stars No radio emission 85% of sources are highly absorbed (X-ray observations): column density NH>1023 cm-2 X-ray absorption >> IR => absorbing matter local ...
Galaxy Evolution Encyclopedia of Astronomy & Astrophysics eaa.iop.org Mauro Giavalisco
... of their stellar populations and interstellar medium, but also for their dynamics. Galaxies are large concentrations of mass, and they would collapse under the effect of their own self-gravity if some opposing force were not there to keep them in dynamical equilibrium. Disks are kept in equilibrium ...
... of their stellar populations and interstellar medium, but also for their dynamics. Galaxies are large concentrations of mass, and they would collapse under the effect of their own self-gravity if some opposing force were not there to keep them in dynamical equilibrium. Disks are kept in equilibrium ...
manual .
... The educational software package PLANETS AND SATELLITES is intended to help students learn and understand the fundamental concepts and laws of physics as they apply to the fascinating world of the motions of natural and artificial celestial bodies. The package includes a detailed manual and several ...
... The educational software package PLANETS AND SATELLITES is intended to help students learn and understand the fundamental concepts and laws of physics as they apply to the fascinating world of the motions of natural and artificial celestial bodies. The package includes a detailed manual and several ...
Galaxy Evolution
... of their stellar populations and interstellar medium, but also for their dynamics. Galaxies are large concentrations of mass, and they would collapse under the effect of their own self-gravity if some opposing force were not there to keep them in dynamical equilibrium. Disks are kept in equilibrium ...
... of their stellar populations and interstellar medium, but also for their dynamics. Galaxies are large concentrations of mass, and they would collapse under the effect of their own self-gravity if some opposing force were not there to keep them in dynamical equilibrium. Disks are kept in equilibrium ...
Spectroscopic Atlas for Amateur Astronomers
... late spectral classes F, G, K, M. Due to the enormous line density it’s, particularly for beginners, very difficult to make the link to the highly blended lines of their own, in most cases lowly resolved profiles. Here at last it becomes clear, why spectral atlases need to be created for specific de ...
... late spectral classes F, G, K, M. Due to the enormous line density it’s, particularly for beginners, very difficult to make the link to the highly blended lines of their own, in most cases lowly resolved profiles. Here at last it becomes clear, why spectral atlases need to be created for specific de ...
Instruction Manual #11007 / #11008 / #11009 ®
... telescope! The CPC DeluxeHD combines Celestron’s newly designed CPC Computerized mount with its new EdgeHD optical system. The CPC series uses GPS (Global Positioning System) technology to take the guesswork and effort out of aligning and finding celestial objects in the sky. Simple and easy to use, ...
... telescope! The CPC DeluxeHD combines Celestron’s newly designed CPC Computerized mount with its new EdgeHD optical system. The CPC series uses GPS (Global Positioning System) technology to take the guesswork and effort out of aligning and finding celestial objects in the sky. Simple and easy to use, ...
Structure in the first quadrant of the Galaxy: an analysis of TMGS star
... structure of our Galaxy. Hammersley et al. (1994) and Calbet et al. (1995) explored the morphology of star counts from the TMGS by heuristic methods, while Hammersley et al. (1995) deduced the displacement of the Sun from the plane from the slight north–south asymmetry of counts crossing the plane. ...
... structure of our Galaxy. Hammersley et al. (1994) and Calbet et al. (1995) explored the morphology of star counts from the TMGS by heuristic methods, while Hammersley et al. (1995) deduced the displacement of the Sun from the plane from the slight north–south asymmetry of counts crossing the plane. ...
THE CASSINI VISUAL AND INFRARED MAPPING SPECTROMETER
... Uranus (MJU) mission in 1975. This design was accepted for the Jupiter Orbiter Probe (JOP, later named Galileo) Mission in 1977. After selection, this design rapidly evolved into that of the NIMS instrument. Further consideration of these concepts for terrestrial applications led the Jet Propulsion ...
... Uranus (MJU) mission in 1975. This design was accepted for the Jupiter Orbiter Probe (JOP, later named Galileo) Mission in 1977. After selection, this design rapidly evolved into that of the NIMS instrument. Further consideration of these concepts for terrestrial applications led the Jet Propulsion ...
Observations, Modeling and Theory of Debris Disks
... that does not mean that all components are necessarily present or detectable around all stars. For many disks, just one component, typically (but not always) that in the Kuiper belt zone, dominates the detected emission, and in such cases, observations over a range of wavelengths provide a probe of ...
... that does not mean that all components are necessarily present or detectable around all stars. For many disks, just one component, typically (but not always) that in the Kuiper belt zone, dominates the detected emission, and in such cases, observations over a range of wavelengths provide a probe of ...
2 Justification and benefits in joining TMT
... questions with the next generation extremely large class telescopes such as the Thirty Meter Telescope (TMT). The Chinese participation in the TMT will place China in the forefront of astronomy for many decades to come; it can be a transformational experience for Chinese astronomy in terms of scienc ...
... questions with the next generation extremely large class telescopes such as the Thirty Meter Telescope (TMT). The Chinese participation in the TMT will place China in the forefront of astronomy for many decades to come; it can be a transformational experience for Chinese astronomy in terms of scienc ...
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.