... 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 are some planets that orbit around two stars. ...

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• Exoplanet Caught on the Move | ESO
• Mario van den Ancker
• High Resolution HST Images of Pluto and Charon (ESO Press Release 09/94)

Johann Kepler - a Legislator of the Sky. The laws of the planets movements put by Johann Kepler destroyed the thousand year old dogmas about the circles and spheres and opened the way to scientific understanding of celestial occurrences. ... The best object for observation was Mars - its orbit unlike the Earth's one has a noticeable eccentricity, the rotation period in comparison with Jupiter and Saturn is not too long and observation conditions are better than for Mercury and Venus. ...

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• urane
• venerae
• plutone

... This glossary is not meant to be an exhaustive list of techno-definitions. ... Is there a term you don't see here? ... Do you know how to pronounce the CONSTELLATIONS , STARS , or the PLANETS and their MOONS ? ... First Law - the orbit of each planet is an ellipse with the sun at a focus . ... LIGHT BUCKET: A common slang term for a large apertures . ... LIGHT POLLUTION: The illumination of the night sky caused by artificial light sources on the ground (streetlights, billboards, etc.) ...

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• Astronomical Glossary - S - Z
• RAS Glossary A to C

In ancient times the solar system was thought to be the whole Universe, so the study of planetary motions was cosmology. ... The planets other than the Moon and Sun generally move West to East through the stars, but occasionally stop and move in the opposite direction ( retrograde motion). In order to explain the retrograde motion of the planets, the geocentric model of the Solar System shown above puts the planets on small circles called epicycles . ...

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Discover the cosmos! ... 2002 June 14 . 55 Cancri: Familiar Planet Discovered . ... The discovery of a Jupiter -like planet in a Jupiter-like orbit around nearby Sun -like star 55 Cancri , announced yesterday, gives a new indication that planetary systems similar to our Solar System likely exist elsewhere. The planet, discovered by G. Marcy ( UC Berkeley ) and collaborators, is one of two new planets found around 55 Cancri -- in 1997 a Jupiter-massed planet was found orbiting very close in. ...

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• APOD: January 31, 1996 - Planets Around Sun-Like Stars
• APOD: 2009 June 3 - VB 10: A Large Planet Orbiting a Small Star
• APOD: November 3, 1997 - Irregular Moons Discovered Around Uranus

... Bad Astronomy . ... Bitesize Astronomy . ... The Nine Planets . ... The Sun stays at the center and the planets orbit it serenely, each in its place. ... Tiny Pluto, orbiting the Sun an average of nearly 40 times the Earth's orbital radius, has an odd orbit. Most planets orbit the Sun in nearly perfect circles, but Pluto's orbit is noticeably elliptical. ... The orbits of Pluto and Neptune have a coincidental timing to them: Pluto orbits the Sun twice for every three times Neptune does. ...

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• Phil Plait's Bad Astronomy: Mad Science
• Phil Plait's Bad Astronomy: Misconceptions
• Phil Plait's Bad Astronomy: Misconceptions: Planet X

... Gallery . ... Mars . ... Sidebar Left . Sidebar Top . No Sidebar . Sidebar Bottom . Sidebar Right . ... Title: Deimos orbiting Mars . ... In the animation, Deimos is moving along its orbit around Mars. Each frame is around 10 minutes apart. NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. ... Deimos orbiting Mars An over-exposed Mars and one of its moons, Deimos (faint spot in lower-left quadrant). ...

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• University Problem Based Learning Exercises for Teaching Astronomy and Physics
• Answers: Assignment 3

God Science Forum Message . ... God and Science | ... Pluto Is Not A Planet, But A Moon Of Neptune. ... Pluto Is Not a Planet, but a Moon of Neptune . 60 years ago, at 1947, the late Mohammed Ali Hassan Al-Hilly, said in his book: (The Universe and the Quran), that Pluto is not a planet but a moon of Neptune. ... He said: " Astronomers, however, think that Pluto is a planet, but I say it is merely a moon of Neptune, and actually it is not a planet. ... www.astronomy.net . About Astronomy Net | ...

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• Astronomy articles, forums, listings, and other resources about Astronomy.
• Lunar Libration - an Astronomy Net Article
• Moon, Planets And Aurora, Oh My! - an Astronomy Net Article

... Tonight's Sky . ... DISK т?? ... Sky this Month . ... Star Atlas . ... A planet is forming in an Earth-like orbit around a young star . New images reveal never-before-seen details in the planet-forming disk around a nearby Sun-like star, including a tantalizing gap at the same distance from the star as Earth is from the Sun. ... ALMA image of the planet-forming disk around the young Sun-like star TW Hydrae. ... Disks of dust and gas that surround young stars are the formation sites of planets. ...

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• NASA's newest Mars mission spacecraft enters orbit around the Red Planet |
• Planets, orbits, and comets are somewhat round. Is there an underlying