Dione ( "dy OH nee" ) is the twelfth of Saturn 's known satellites: orbit : 377,400 km from Saturn diameter : 1120 km mass : 1.05e21 kg . ... Both rotate synchronously and have dissimilar leading and trailing hemispheres. ... Helene orbits in Dione's leading Lagrange point. more images . ... Helene is in Dione's leading Lagrange point and hence was sometimes referred to as "Dione B". from LANL . How did Helene come to be in Dione's Lagrange point? ... Saturn .. ... Dione / Helene .. ...

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• APOD: 2009 September 23 - CoRoT Satellite Discovers Rocky Planet
• APOD: 2000 January 14 - Chandra Resolves the Hard X Ray Background
• APOD: 2009 November 18 - Water Discovered in Moon Shadow

Rhea . ... Rhea is an icy body with a density of 1.33 gm/cm 3 . The low density indicates that it is composed of a rocky core taking up less than one-third of the moon's mass, with the rest composed of water-ice. ... Rhea is heavily cratered with bright whispy markings. ... The second area, in parts of the polar and equatorial regions, has craters under 40 kilometers (25 miles) in diameter. ... Orbital period (days) . ... Credit: Calvin J. Hamilton) . ... Copyright © 1997 by Calvin J. Hamilton . ...

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• Saturn's Moon Dione
• Titan Press Release
• Saturn's Satellite Prometheus

... Dione's icy surface includes heavily cratered terrain, moderately cratered plains, lightly cratered plains, and whispy material. The heavily cratered terrain has numerous craters greater than 100 kilometers in diameter. ... Much of the heavily cratered terrain is located on the trailing hemisphere , with the less cratered plains area existing on the leading hemisphere . ... Because Dione is relatively small, an impact causing a 35 kilometer (21 mile) crater could have spun the satellite. ...

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• Titan Press Release
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Astronomy Picture of the Day . Unusual Hollows Discovered on Planet Mercury . ... 27.03.2012 . ... Credit Copyright: NASA / JHU APL / CIW Explanation: What are those unusual features on planet Mercury? ... The rounded depressions appear different than impact craters and nothing like them has been noted on Earth's Moon or anywhere else in the Solar System . ... March 2012 . ... Publications with keywords: Mercury . Publications with words: Mercury . ... MESSENGER s Last Day on Mercury . ...

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• XWare > APOD

In early mid-infrared observations (c 1970) two prominent dust emission features were discovered. ... Soon after the discovery of the silicate features another feature at about 11.3 microns was discovered in the spectra of some carbon stars, not as wide or as strong as the silicate features but still thought to be due to a solid material. ... less common features: extreme carbon stars, the AlO/silicate complex, the "unidentified infrared" features, unusual silicate features . ...

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• STScI Preprint #1224
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Supernova 2009js in NGC 918 . This page is devoted to information on Supernova 2009js in NGC 918 . Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main page . Information on the original web pages for many of these images can be found on the updates and links web pages. Discovered independently by Lick Observatory Supernova Search (USA) and Koichi Itagaki (Japan). ... 2009/10/11.44 . 17.2 . ... Joseph Brimacombe . ...

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... An artificial comet holds secrets to Earths life . ... Astronomers recently discovered that Scholz's star passed close to the Sun 70,000 years ago. Wouldn't its gravity have sent Oort Cloud comets raining into the inner planets? ... COMETS | OORT CLOUD . Based on the number of long-period comets that enter the inner solar system, astronomers estimate there are probably trillions of them in the Oort Cloud. Get instant access to subscriber content on Astronomy.com! ... Discover | ...

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• Astronomers recently discovered brown dwarfs of only a few hundred degrees
• Huge tornadoes discovered on the Sun | Astronomy.com
• Exploring the cosmic microwave background | Astronomy.com

Astronotes Armagh Planetarium's Stellar Blog! ... Armagh Planetarium . ... Solar System . ... Planets . ... Space Flight . ... Neptune, which is not visible with the naked eye, was discovered by mathematical prediction in 1846 before being observed through a telescope. ... Tidal interactions between Neptune and Triton mean that in 100 million years these two bodies may come too close to one another causing Triton to be torn apart leaving Neptune with a ring system more spectacular than SaturnтАЩs. ...

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... Coming Soon to a Channel Near You: Oracle.. ... But now users are discovering that this beefy class of multiprocessing, "fault-tolerant" PC servers handle databases just as well as mainframes and minicomputings. ... Programmers at four competing Unix software vendors are working together on what may be the last chance for Unix on the corporate desktop. ... COSE's Common Desktop Environment goes a long way toward establishing a standard Unix interface that's easy enough for novice users to master. ...

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... When the Voyager 2 spacecraft flew by the planet Uranus in January 1986, astronomers were treated to their first close-up glimpse of the satellites that orbit the seventh planet. ... But by far the most intriguing of those 15 satellites was a jigsaw-puzzle world called Miranda . ... How dark was it at Miranda? One of the Voyager scientists put it this way: Taking pictures in the Uranus system is like trying to do photography in a ballpark at night when the only light comes from a single candle. ...

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• ASP: The Universe: Yours to Discover
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... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... Survey Telescopes . ... Exoplanets . ... Star Clusters . ... ESOcast . ... Video News Releases . ... Stars@ESO . New on eso.org . ... ESO News . ... New Technology Telescope . ... HARPS . ... Fifty Highlights . ... Astronomers using ESOтАЩs leading exoplanet hunter HARPS have today announced more than fifty newly discovered planets around other stars. ... ESOcast 35: Fifty New Exoplanets . ...

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... SOLARFEST 2009 Saturday 20 June, Dunsink Observatory . ... Something totally different but no doubt equally fascinating will be the main afternoon talk "The Universe: Yours to discover" to be given by Robert Hill, manager of the Northern Ireland Space Office, based at the Armagh Planetarium and a member of the International Astronomical Union Executive Committee Working Group for International year of Astronomy 2009. ... International Year of Astronomy, Ireland National Node . ...

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• Terry Mosely's Bulletins
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• Armagh Observatory

Born in the UK, and following degrees at the Univerities of Bristol and Sussex, Martin Elvis got his PhD under Prof. Ken Pounds at the University of Leicester (UK) in 1978 for work with the Ariel V satellite. Ariel V was only the 2nd satellite to be devoted to X-ray astronomy. ... His PhD thesis demonstrated that powerful X-ray emission was a normal feature of Active Galactic Nuclei (or "AGN"). AGN X-ray emission has been a lively area of research ever since. ...

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• The Diffuse X-Ray Background
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... About meteorites . ... Meteoritic data . Impact Crater Smerdyachee . ... Based on Smerdyachee's depth, near circularity, and its mounded wall, and analysis by N.A. Fillin of nearby Roshal, Russia, the Estonian scientists Yu.V. Krestlane and K.H. Mella proposed in 1987 that Smerdyachee Lake is a meteorite crater. ... In 2002, the Laboratory of Meteoritics of the Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences explored this mysterious lake. ...

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... Contacts . 2010: . Sources of polarized radiation with unusual spectral features discovered in the Sun. In the framework of the study of solar active regions that produce powerful flares the researchers from the RATAN-600 radio telescope have detected sources with features in the form of a sharp decrease in the intensity of polarized radiation in various parts of the recorded frequency range (2-16GHz), sometimes changing the sign of polarization. ... Contacts: Bogod V.M. ) . Archive . ...

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• IRAS01005+7910
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Image credit: Michael Nolan, Arecibo Observatory. These radar images of near-Earth asteroid 2001 SN263 were obtained on 2008 Feb 12 and 13. ... Image from Feb 12 . ... First near-Earth triple asteroid discovered by Arecibo Observatory . ... was discovered this week by astronomers at the sensitive radar telescope at Cornell University?s Arecibo Observatory in Puerto Rico. ... For example, Arecibo has discovered more than half of the near-Earth binary asteroid systems discovered since 1999. ...

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• Radar Images of asteroid 1998 ML14
• Asteroid 1998 ML14 1998 Aug 14-17
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. Go Here for Hubble Ultra Deep Field . ___________________________________________________________________ The Electronic Universe Project e-mail: nuts@moo.uoregon.edu

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... Comparison of a synthetic radio image and quaтАж . ... Title: Comparison of a synthetic radio image and quasar 3C 48 . Description: Comparison of a synthetic radio image (left panel) derived from the movie "Movie 1" and a VLBI image of the qusar 3C 48 (the second quasar discovered). ... Comparison of a synthetic radio image and quasar 3C 48 Comparison of a synthetic radio image (left panel) derived from the movie "Movie 1" and a VLBI image of the qusar 3C 48 (the second quasar discovered). ...

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• Siding Spring Survey
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... Ж.Ф. Родионова, А.А.Карлов, Т.П. Скобелева и др. ... Sternberg State Astronomical Institute, 119899, Moscow, Russia; jeanna@sai.msu ru. ... Moscow State University, Vorobjovy Gory, 119899, Moscow, Russia. Brown University - Vernadsky Institute Microsymposium 34, October 8-9, 2001, Moscow, Russia . ... Rodionova J1., ... Sternberg State Astronomical Institute, Moscow University, jeanna@sai.msu.ru . ... 1 Sternberg State Astronomical Institute Lomonosov Moscow University, Russia; marss8@mail.ru . ...

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• Zhanna F. Rodionova
• Morphological Catalogue Of The Craters Of Mars
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Cyclotron absorp.on features in neutron star systems observed by INTEGRAL Wei Wang Na.onal Astronomical Observatories, Beijing, China Cosmic magnetism, Kiama June 7 2010 Contents Ї Magne.c fields in neutron stars Ї History of observing cyclotron line features Ї Cyclotron absorp.on lines detected by INTEGRAL confirm previous known: Vela X 1; Her X 1; V0332+53; A0535+26 new candidates: 4U 2206+54; 2S 0114+65; IGR J01583+6713 Proton line or electron line ? ... 2005). ...

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