... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Risks Comparable to NEOs . ... The Increasing Rate of Discovery of Asteroids . ... Comet and Asteroid Collision Probabilities . ... Extreme albedo comets and the impact hazard (PDF Format) . ... Asteroid Impact Animations . ... Workshop on Scientific Requirements for Mitigation of Hazardous Comets and Asteroids - 2002 . ... The Spaceguard Survey Report, 1992 (PDF) . Tsunami from Asteroid/Comet Impacts . ...

M1 image More About M1 Nice Color Picture . ... M16 image More About M16 HST image . ... M31 image More About M31 Nice Color Picture . ... M42 image ; M43 image More About M42/43 Nice Color CCD Picture . M51 image More About M51 Color Image of M51 M51 Supernova . M57 image More About M57 Nice Color CCD Picture Very Deep M57 Image . ... M81 image More About M81 M81 Supernova Ultraviolet Image of M81 More about Ultraviolet Imaging . M82 image More About M82 M82 False Color M82 True Color . ...

... 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! . ...

You don't need your own Voyager to see the solar system. You can see much of it from your own back yard. ... If you enjoyed The Nine Planets , go outside and take a look at what you just read about. ... Touring the Universe through Binoculars . ... Refer to Sky & Telescope or a similar magazine for up to date positions or check one of the several Web sites that show planetary positions. ... You can see 99.99% of the mass of the solar system with no instruments whatsoever: . ... William Herschel . ...

Y ou don't need your own Voyager to see the solar system. ... Refer to Sky Telescope or a similar magazine for up to date positions or check one of the several Web sites that show planetary positions. ... You can see 99.99% of the mass of the solar system with no instruments whatsoever. ... Jupiter . ... Mars . ... For $200 you can get a far better optical instrument than Galileo or Newton had. ... Date . ... William Herschel . ... O f course, the solar system has more than just planets and moons. ...

... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Another method is to take very fast exposures of an object; in effect taking images faster than the seeing can blur the image. ... A third, relatively new method, is to try to detect just how the seeing is affecting the image, and actually warp the telescope mirror to compensate. ... The advantage of the second method is that it's easier to make many small mirrors than one big one. ...

. If an object is moving so fast that its kinetic energy exceeds this, it can escape out into space, never to return. Thus . Previous slide . Next slide . Back to first slide . View graphic version .

... Механизмы излучения космических объектов: классика и современность . ... Studies of radiation mechanisms and processes of spectra formation in astrophysical objects are among the fundamental tasks of modern astrophysics. ... On this occasion the Saint-Petersburg State University organizes an international conference Radiation mechanisms of astrophysical objects: classics today , which will be held in St. Petersburg from September, 21 to September, 25, 2015. ... radiative transfer theory, . ...

... The remote planet Pluto and its moon Charon orbit the Sun at a mean distance of almost 6,000 million kilometres, or nearly fourty times farther out than the Earth. During a recent investigation by an international group of astronomers [1], the best picture ever of Pluto and Charon [2] was secured with the European Space Agency's Faint Object Camera at the Hubble Space Telescope (HST). ... The new HST image was taken when Charon was near its maximum elongation from Pluto (0.9 arcseconds). ...

... 30.09.2008 . ... Credit Copyright: Mike Salway ( IceInSpace ) Explanation: Can you spot the Solar System's four rocky planets ? ... Pictured above , the brightest and highest object in the sky is the planet Venus . The object lowest in the sky is the planet Mars , while the object furthest to the left is the planet Mercury . ... NASA Web Site Statements, Warnings, and Disclaimers . ... Publications with keywords: planets - Solar System . Publications with words: planets - Solar System . ...

The Astronomy Net . Articles | ... Forums . ... Planets | ... The list below is a live snapshot of where the planets and moon are located right now. ... The links in the left hand column take you to a mirror of the excellent NinePlanets web site where you can read about each planet and much much more. The latest news includes the fact that Pluto is no longer classified as a planet. ... Pluto is now classified as a 'dwarf planet' which includes Ceres and soon to be many others. ... 100 . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Moon . Planets . ... December . ... By admin February 15, 2011 Posted in: Planets . Eris with its small moon Dysomnia are portrayed in this artist's impression which also includes Arcturus, Antares and the Zodiacal Light around the Sun. ... On August 24 2006, it happened: Pluto the ninth planet in our Solar System, was relegated, demoted, downgraded, basically was no longer classed as a planet. ... Posted December 4, 2013 at 11:47 AM . ...

... Tonight's Sky . ... The Magazine . ... Observing . ... Magazine . ... 50 Weirdest Objects . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... Weird Object: Pulsar Planets . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ... Astronomy Magazine . ...

This section of AMPLE enables one to make ephemeris calculations in various coordinate systems (spherical, rectangular) connected with different main planes (equator, ecliptic, horizon) and having origin in different points: geocenter, any point on the Earth surface, the Sun, any major planet, any minor planet. The choice of some minor planet as a center gives possibility to find approaches of the minor planet with any set of major planets and minor planets. ... equinox . 1950 2000 true . ...

Subject of Astronomy. ... Celestial Sphere. ... Spherical Frames of Reference: Horisontal and Equatorial Coordinates, Ecliptical System. ... Transformation of Celestial Coordinates. ... Change of Object Coordinates as a Result of Diurnal Rotation of Celestial Sphere. Phenomenons, Which Lead to Celestial Coordinates Change. ... Motion of Equator, Ecliptic, and Their Poles. ... Diurnal Solar Motion on Different Latitudes. ... Time Equation. ... Apparent Motions and Configuration of Planets. ...

... STScI Boardroom . ... 2012 Seminars . ... Alternate Time, 12:30pm . Planets, Life and the Universe Lecture Series . ... Jackie Radigan (University of Toronto) . ... Daniel Jontof-Hutter (University of Maryland) . ... Eric Algol (University of Washington) . ... Jessica Donaldson (University of Maryland) . ... An Update on the Habitable-Zone Planet Gliese 581g" . ... Finding Planets with Microlensing: Present and Future . ... STScI Solar System, Extra-solar Planets Life Research Group . ...

... I note that "Z" plays an important role in what the ALFA surveys will look for: . ... low Z . nearby low mass . ... Arecibo . ... ADBS (Arecibo Dual Beam Survey): Rosenberg & Schneider 2002. ... A few sources with unobvious optical counterparts. ... Coverage wins for volume, but if you do a shallow survey you are sampling only the nearby volume at low masses. ... So need artificial test sources to find completeness. ... Total volume within survey in which source could have been detected. ...

... SATELLITE: An object that revolves around a planet. ... SIDEREAL DAY: The length of a planet's rotation period relative to the stars. SOLAR SYSTEM: The sun and all the objects that are held in its gravitational field and move around it. ... SUPERIOR CONJUNCTION: The position of a planet when it is on the opposite side of the Sun from Earth (thus making in invisible). ... TRANSIT: The movement of an object between the Earth and the Sun and showing on the surface of the sun as a black dot. ...

... JavaScript 1.1: added current, next, and previous properties. ... To change a window's current URL without generating a history entry, you can use the Location.replace method. ... For example, if the history list contains three named entries, these entries are reflected as history[0] , history[1] , and history[2] . ... back . ... onClick="history.go('home.netscape.com')"> The following button navigates to the URL that is three entries backward in the history list: <P><INPUT TYPE="button" VALUE="Go" ...

... Up: Data Analysis and Processing Techniques . ... Also, a method for quality control of CCD observations is suggested. ... Everyone who observes a celestial object using a CCD detects moving celestial objects as a ``by product''. ... We hope that our investigations may be useful for near-Earth space control and also for searches of the moving celestial objects through analysis of old and new CCD frames obtained at any amateur or professional astronomical observatory. ...