... More on 51 Peg: . The discovery of a Jupiter--mass planet in orbit around the solar--type star 51Peg has been reported by Michel Mayor and Didier Queloz (Geneva Observatory) on October 6th at the 9th Cambridge workshop on "cool stars, stellar systems, and the sun" held at Florence (Italy). ... Recall that the measurements of radial velocity only yield v sin i which in turn gives us M sin i. For most values of i, sin i will be greater than 0.5 and this gives a mass estimate of 0.5 Jupiter masses. ...

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• http://zebu.uoregon.edu/51peggm.html
• Astronomy HyperText Book: Planetary Motion

Astropark Home . Solar System . ... Planets . ... A year is the time that it takes for a planet to go around the Sun. ... As a result, an Earth year is very different in length from a year on Saturn or any other planet. ... But on this scale, most of the planets are too small to see, so their size has been increased by 200 times. ... The Astropark's red gravel represents the asteroid belt – thousands of smaller bodies which range in size from pebbles up to small planets hundreds of miles across. ...

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• Human Orrery
• Extrasolar Planetary Systems: More Like Ours - by David Perez-Suarez, Armagh
• Armagh Astropark

... Planets . ... Earth Satellites . ... The newly discovered ?mega-Earth? ... Its sibling, the lava world Kepler-10b, is in the background (the two planets? proximity is grossly exaggerated) .€а Kepler-10c has a diameter of about 29 000 km, 2.3 times as large as Earth, and weighs 17 times as much. ... The first mega-earth to be discovered is Kepler-10c which orbits a star lying about 560 light years from the Sun in the constellation Draco. ... Astronomers Find a New Type of Planet: The ?Mega-Earth? ...

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• Kepler 36b and c: Too Close for Comfort | Astronotes
• Kepler-11: a strange and crowded planetary system | Astronotes
• Rings Around an Asteroid | Astronotes

... The study of extra solar planets will be one of the most important areas of research in astronomy in this century. ... The first planets outside the solar system were found in 1992 around the millisecond pulsar PSR B1257+12 by Alex Wolszczan at the Arecibo Observatory . ... Three space missions based on this principle (MOST, COROT and Kepler ) have already been launched or approved, and have the last one at least has the potential to find Earth-sized planets. ... SIM ( NASA ) is one of such missions...

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My research efforts have focused on three areas which are: . More than 200 extrasolar planets have been discovered around relatively nearby stars, primarily through the Doppler line shifts owing to the reflex motions of their host stars, and more recently through transits of some planets across the face of the host stars. ... Gravitational microlensing provides a novel technique to look for planets around lens stars, and this is the only technique currently capable of detecting Earth-mass planets. ...

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• Producing an Unbiased Study for the Spheres of Influence of 1 Solar Mass Stars
• HST this week: 296
• The Kepler Mission: A Photometric Mission to Determine the Frequency of Inner

Here the ellipse is studied in polar coordinates (r,f) , requiring minimal familiarity with the function cos f in the range 0 e . It is also noted that planets actually orbit the center of gravity of the solar system, and that distant planets may be detected by motions of their central star around the centers of gravity of their planetary systems. ... This lesson plan supplements: "Ellipses Kepler's 1st Law," section #11b: on disk Skepl1sto.htm , on the web . ... A circle is also an ellipse. ...

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• Lagrangian Points
• The Scale of the Solar System
• More on Kepler's Second Law

... AMPLE (Adaptable Minor Planet Ephemerides) is integrated software package to deal with a number of problems concerning minor planets with the aid of IBM-type personal computer. ... compiling a list of all numbered minor planets which can be seen at certain moment within specified sky region and visualization of their mutual positions; . ... As AMPLE is able to reproduce virtually any table of "the Ephemerides of Minor Planets" , it may be considered as computer version of the EMP. ...

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• (Untitled)

... Indeed, one alteration of orbits can be the outright ejection of a planet. When several big planets are orbiting a star under each other's influence, the system is inherently unstable. ... We know of no good reason why the smallest objects with fusion should have the same mass as the smallest objects that can form by themselves. ... 6) Mission Definition . ... I don't think this mission is impossible, and will suggest a definition in a future article in Mercury. ... Good luck! . ...

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• ASP: The Music of the New Spheres?
• ASP: A Flag for Mars
• ASP: Up, Up, and Away

The Moon orbits around the Earth. ... To keep the Moon moving in that circle--rather than wandering off--the Earth must exert a pull on the Moon, and Newton named that pulling force gravity . ... If it was the same force, then a connection would exist between the way objects fell and the motion of the Moon around Earth, that is, its distance and orbital period. ... Newton went further and proposed that gravity was a "universal" force, and that the Sun's gravity was what held planets in their orbits. ...

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• Lagrangian Points
• Kepler's Second Law
• Kepler's First Law of Planetary Motion

... 13.09.1997 . ... Kepler was able to use Brahe 's data to show that planets move in ellipses around the Sun ( Kepler's First Law ), that planets move proportionally faster in their orbits when they are nearer the Sun ( Kepler's Second Law ), and that more distant planets take proportionally longer to orbit the Sun ( Kepler's Third Law ). ... NASA Web Site Statements, Warnings, and Disclaimers . ... Publications with keywords: kepler - planets . Publications with words: kepler - planets . ...

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• Астронет > Notes for PSR 1257+12
• Journal "Peremennye Zvezdy"
• Астронет > Notes for Gliese 876

On the inclination of planetary orbits! Caroline Terquem! ... Planets on inclined orbits Higher inclinations for planets around stars with Teff>6250K? Planet formation, Hot Jupiters and misalignments 1. If planets form by the core accretion scenario and migrate in: Hot Jupiters But no eccentricity and no misalignment (if the disc is in the star's equatorial plane) With further planet/planet scattering and/or Kozai cycles: Eccentricity and misalignment But companions required.. ...

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• http://www.mrao.cam.ac.uk/wp-content/uploads/2014/04/AMustill.pdf
• Astrophysics Group Research and Instrumentation

... It s well known that the planets, moons, asteroids and other objects in our Solar System orbit the Sun in a more-or-less perfectly flat, disc-like motion, like a spinning CD. ... By 25 July 2014, 1811 planets had been found orbiting distant stars, and the majority of these planets do orbit their stars in roughly disc-shaped orbits. ... The two planet-forming discs (one around each star) are tilted almost at a right-angle to each other. ... But there ar