as a PDF file
... faithfully follows the fixed stars, the stars appear as dots but slowly moving asteroids make small dashes which are readily noticed. This technique is so powerful that by now many thousands of asteroids have been detected; more than 2 × 104 have computed orbits. ...
... faithfully follows the fixed stars, the stars appear as dots but slowly moving asteroids make small dashes which are readily noticed. This technique is so powerful that by now many thousands of asteroids have been detected; more than 2 × 104 have computed orbits. ...
Advances in exoplanet science from Kepler
... configuration may be long-lived, most nearby configurations are unstable on short timescales (Deck et al. 2012), so it is far from clear how these planets arrived at their current orbits. The first transiting circumbinary planet to be discovered, Kepler-16 b, is an object of approximately Saturn’s m ...
... configuration may be long-lived, most nearby configurations are unstable on short timescales (Deck et al. 2012), so it is far from clear how these planets arrived at their current orbits. The first transiting circumbinary planet to be discovered, Kepler-16 b, is an object of approximately Saturn’s m ...
DIO vol. 15 - DIO, The International Journal of Scientific History
... my search he was 87 years old. He looked exceedingly frail, but he delighted in climbing ladders while onlookers held their breath. (Years later, Dr. Pogo did fall down and break his hip. He died in 1988, at the age of 95.) Pogo knew every book in that library, as well as the publication history of ...
... my search he was 87 years old. He looked exceedingly frail, but he delighted in climbing ladders while onlookers held their breath. (Years later, Dr. Pogo did fall down and break his hip. He died in 1988, at the age of 95.) Pogo knew every book in that library, as well as the publication history of ...
DIO 15 - DIO, The International Journal of Scientific History
... characterizing the position of constellations or stars relative to the principal celestial circles, or that he imagined any coordinate system of any kind beyond the circles already mentioned. Indeed, it seems unlikely that he gave any direct measures of position whatsoever, since while Hipparchus le ...
... characterizing the position of constellations or stars relative to the principal celestial circles, or that he imagined any coordinate system of any kind beyond the circles already mentioned. Indeed, it seems unlikely that he gave any direct measures of position whatsoever, since while Hipparchus le ...
Chap 16: Galaxies
... Infer mass in the very center central black holes! Several million, up to more than a billion solar masses! Supermassive ...
... Infer mass in the very center central black holes! Several million, up to more than a billion solar masses! Supermassive ...
The new sun-sky-lunar Cimel CE318
... weak star light make stellar measurements still limited in use, especially for large-scale networks such as AERONET. The study developed by Berkoff et al. (2011) was the pioneering work in moon photometry, being the first one to use a modified Cimel sun photometer to obtain night-time AOD measuremen ...
... weak star light make stellar measurements still limited in use, especially for large-scale networks such as AERONET. The study developed by Berkoff et al. (2011) was the pioneering work in moon photometry, being the first one to use a modified Cimel sun photometer to obtain night-time AOD measuremen ...
solar system
... system. Copernicus still retained the priviledged status of circular motion and therefore had to construct his planetary orbits from circles upon and within circles, just as his predecessors had done. His tables were perhaps only marginally better than existing ones. The reception of ...
... system. Copernicus still retained the priviledged status of circular motion and therefore had to construct his planetary orbits from circles upon and within circles, just as his predecessors had done. His tables were perhaps only marginally better than existing ones. The reception of ...
Stars and Planets Credits and Acknowledgements
... make a scale model of time rather than distance. The lifetimes of different masses of stars are compared to each other and to the geologic timeline for the Earth. Students then make predictions about what classes of main sequence stars might have planets with interesting life forms (as defined by th ...
... make a scale model of time rather than distance. The lifetimes of different masses of stars are compared to each other and to the geologic timeline for the Earth. Students then make predictions about what classes of main sequence stars might have planets with interesting life forms (as defined by th ...
Advances in exoplanet science from Kepler (Lissauer et al. 2014)
... radius, and the repetition rate of transits tells us the planet’s orbital period. The stellar colours — or, better yet, stellar spectrum — can be used to deduce the star’s radius and mass, and from these we can find the planet’s radius and the semi-major axis of its orbit (from Kepler’s third law). ...
... radius, and the repetition rate of transits tells us the planet’s orbital period. The stellar colours — or, better yet, stellar spectrum — can be used to deduce the star’s radius and mass, and from these we can find the planet’s radius and the semi-major axis of its orbit (from Kepler’s third law). ...
The Origin of Comets - Wesley Grove Chapel
... very near each other, capture does not occur. This is because they seldom collide and stick together, their relative velocities almost always allow them to escape each other’s sphere of influence, their spheres of influence rarely expand, and gases are not inside these spheres to assist in capture. ...
... very near each other, capture does not occur. This is because they seldom collide and stick together, their relative velocities almost always allow them to escape each other’s sphere of influence, their spheres of influence rarely expand, and gases are not inside these spheres to assist in capture. ...
Asteroids - GEOCITIES.ws
... Although most asteroids travel in fairly circular orbits, there are some notable exceptions. One of the most extreme of these is 3200 Phaethon, discovered by the Infrared Astronomical Satellite (IRAS) in 1983. (It was the first asteroid to be discovered by a spacecraft.) Phaethon approaches to withi ...
... Although most asteroids travel in fairly circular orbits, there are some notable exceptions. One of the most extreme of these is 3200 Phaethon, discovered by the Infrared Astronomical Satellite (IRAS) in 1983. (It was the first asteroid to be discovered by a spacecraft.) Phaethon approaches to withi ...
Document
... distant stellar backgrounds due to Earth’s orbital motion. A star as near as 3.26 light years at ecliptic pole describes circular path of radius 1 arc second. (Discovered 1837.) ...
... distant stellar backgrounds due to Earth’s orbital motion. A star as near as 3.26 light years at ecliptic pole describes circular path of radius 1 arc second. (Discovered 1837.) ...
=======31 Radioactive Decay Data El =======
... becoming a different element. This is called radioactive disintegration. Knowing the half-life (the time it takes for half of the radioactive element to disintegrate) scientists have developed methods to date objects containing a radioactive element. Each radioactive element has its own unique half- ...
... becoming a different element. This is called radioactive disintegration. Knowing the half-life (the time it takes for half of the radioactive element to disintegrate) scientists have developed methods to date objects containing a radioactive element. Each radioactive element has its own unique half- ...
Planet Formation in the Outer Solar System
... within range of the S ∝ A⫺3/2 line. If these estimates are correct, the total mass of the minimum-mass solar nebula is ∼0.01 M, for an outer radius of ∼100 AU, close to the median mass for circumstellar disks surrounding young stars in nearby regions of star formation (Lada 1999). Figure 2 suggests ...
... within range of the S ∝ A⫺3/2 line. If these estimates are correct, the total mass of the minimum-mass solar nebula is ∼0.01 M, for an outer radius of ∼100 AU, close to the median mass for circumstellar disks surrounding young stars in nearby regions of star formation (Lada 1999). Figure 2 suggests ...
Sky Watcher - Boise Astronomical Society
... The Red Planet reached opposition and peak visibility in April, and remains impressive during May. It halts its retrograde (westward) motion on May 21, so it lingers the whole month near the fairly bright star Gamma Virginis, also known as Porrima. The best times to view are when Mars climbs highest ...
... The Red Planet reached opposition and peak visibility in April, and remains impressive during May. It halts its retrograde (westward) motion on May 21, so it lingers the whole month near the fairly bright star Gamma Virginis, also known as Porrima. The best times to view are when Mars climbs highest ...
ABSTRACT Exoplanet Habitability and an Analysis of Gliese 436 b
... have greater disparities between then maximum and minimum light flux on the light curve. However, advancements in light capturing cameras and the Kepler Spacecraft have made it easier to detect Earth-like planets in both composition and size.8 The transit method can also be used to determine the tim ...
... have greater disparities between then maximum and minimum light flux on the light curve. However, advancements in light capturing cameras and the Kepler Spacecraft have made it easier to detect Earth-like planets in both composition and size.8 The transit method can also be used to determine the tim ...
Celestial Navitation - National University of Singapore
... chart called a portolano during the 13th century that showed the outline of the coast and the inclusion of crosslines which aided in locating directions during their voyagers. The Greeks also contributed two inventions to measure the altitudes of celestial bodies known as the cross-staff and the ast ...
... chart called a portolano during the 13th century that showed the outline of the coast and the inclusion of crosslines which aided in locating directions during their voyagers. The Greeks also contributed two inventions to measure the altitudes of celestial bodies known as the cross-staff and the ast ...
The Solar System and Beyond
... In the 1970’s, there was a huge gap between the length scale of parsecs (pc’s) characterizing local interstellar medium measurements, provided mostly by stellar observations, and the scale of astronomical units (AUs), the size of local inhomogeneities in the immediate environment of the Sun, require ...
... In the 1970’s, there was a huge gap between the length scale of parsecs (pc’s) characterizing local interstellar medium measurements, provided mostly by stellar observations, and the scale of astronomical units (AUs), the size of local inhomogeneities in the immediate environment of the Sun, require ...
docx file
... months later, Comet Hyakutake began its long trek back to the outer Solar System. Because of being gravitationally deflected by massive planets, Comet Hyakutake is not expected back for about 100,000 years. APOD: 2009 February 25 - Two Tails of Comet Lulin Explanation: Go outside tonight and see Com ...
... months later, Comet Hyakutake began its long trek back to the outer Solar System. Because of being gravitationally deflected by massive planets, Comet Hyakutake is not expected back for about 100,000 years. APOD: 2009 February 25 - Two Tails of Comet Lulin Explanation: Go outside tonight and see Com ...
ultraviolet radiation in the solar system
... In the history of science the opening up of a new observational or experimental window is always followed by an increase in knowledge of the subject concerned. This is also the case with the subject of this book, ultraviolet radiation (hereafter UV). In principle, the ultraviolet range might be just ...
... In the history of science the opening up of a new observational or experimental window is always followed by an increase in knowledge of the subject concerned. This is also the case with the subject of this book, ultraviolet radiation (hereafter UV). In principle, the ultraviolet range might be just ...