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Astronomy USA - June 2013 (HQ PDF) > http://shurll.com/alj6n





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European,,Southern,,Observatory"Step,,aside,,Saturn:,,Little,,asteroid,,has,,rings,,too""A,,,,ring,,,,system,,,,detected,,,,around,,,,the,,,,Centaur,,,,(10199),,,,Chariklo",,,,(PDF)v,,t,,e,,Planetary,,rings,,Planets,,Rings,,of,,Jupiter,,Rings,,of,,Saturn,,Rings,,of,,Uranus,,Rings,,of,,Neptune,,Rings,,of,,exoplanets,,Other,,bodies,,Rings,,of,,Chariklo,,Rings,,of,,Chiron,,Rings,,of,,Rhea,,Solar,,Asteroid,,belt,,Kuiper,,belt,,Related,,topics,,Gas,,torus,,"Brasileiros,,descobrem,,anis,,semelhantes,,aos,,de,,Saturno,,em,,torno,,do,,asteroide,,Chariklo"This,,,,suggests,,,,that,,,,the,,,,rings,,,,are,,,,composed,,,,at,,,,least,,,,partially,,,,of,,,,water,,,,icearXiv:1501.05911Retrieved,,,,2014-03-28ESO.org^,,,,"Occultation,,,,by,,,,(10199),,,,Chariklo,,,,-,,,,2013,,,,Jul,,,,30"With,,,an,,,optical,,,depth,,,of,,,about,,,0.06,,,,it,,,is,,,markedly,,,more,,,diffuse,,,than,,,its,,,companion.[11],,,Altogether,,,it,,,contains,,,approximately,,,a,,,twelfth,,,the,,,mass,,,of,,,C1R,,,,roughly,,,equivalent,,,to,,,an,,,icy,,,body,,,a,,,kilometre,,,across.[1]Impact,,velocities,,in,,the,,outer,,Solar,,System,,are,,typically,,1km/s,,(compared,,with,,the,,escape,,velocity,,at,,the,,surface,,of,,Chariklo,,of,,0.1km/s),,,and,,were,,even,,lower,,before,,the,,Kuiper,,belt,,was,,dynamically,,excited,,,supporting,,the,,possibility,,that,,the,,rings,,formed,,in,,the,,Kuiper,,belt,,before,,Chariklo,,was,,transferred,,to,,its,,current,,orbit,,less,,than,,10,,Myr,,ago.[1],,Impact,,velocities,,in,,the,,asteroid,,belt,,are,,much,,higher,,(5km/s),,,which,,could,,explain,,the,,absence,,of,,such,,ring,,features,,in,,minor,,bodies,,within,,the,,asteroid,,belt.[1],,Collisions,,between,,ring,,particles,,would,,cause,,the,,ring,,to,,widen,,substantially,,,and,,PoyntingRobertson,,drag,,would,,cause,,the,,ring,,particles,,to,,fall,,onto,,the,,central,,body,,within,,a,,few,,million,,years,,,requiring,,either,,an,,active,,source,,of,,ring,,particles,,or,,dynamical,,confinement,,by,,small,,(kilometre-sized),,embedded,,or,,shepherd,,moons,,yet,,to,,be,,discovered.[1],,Such,,moons,,would,,be,,very,,challenging,,to,,detect,,via,,direct,,imaging,,from,,Earth,,due,,to,,the,,small,,radial,,separation,,of,,the,,ring,,system,,and,,Chariklo.[1]Retrieved,,,,2014-03-28The,,,minor,,,planet,,,and,,,centaur,,,10199,,,Chariklo,,,,with,,,a,,,diameter,,,of,,,about,,,250,,,kilometres,,,(160mi),,,,is,,,the,,,smallest,,,object,,,with,,,rings,,,and,,,the,,,fifth,,,ringed,,,object,,,ever,,,discovered,,,in,,,the,,,Solar,,,System.[1],,,Orbiting,,,Chariklo,,,is,,,a,,,bright,,,ring,,,system,,,consisting,,,of,,,two,,,narrow,,,and,,,dense,,,bands,,,,67km,,,(4mi),,,and,,,24km,,,(2mi),,,wide,,,,separated,,,by,,,a,,,gap,,,of,,,9,,,kilometres,,,(6mi).[1][2],,,The,,,rings,,,orbit,,,at,,,distances,,,of,,,about,,,400,,,kilometres,,,(250mi),,,from,,,the,,,centre,,,of,,,Chariklo,,,,a,,,thousandth,,,the,,,distance,,,between,,,Earth,,,and,,,the,,,MoonA,,request,,for,,formal,,names,,will,,be,,submitted,,to,,the,,IAU,,at,,a,,later,,date.[3]With,,,the,,,aid,,,of,,,thirteen,,,telescopes,,,located,,,in,,,Argentina,,,,Brazil,,,,Chile,,,,and,,,Uruguay,[7],,,a,,,team,,,of,,,astronomers,,,led,,,by,,,Felipe,,,Braga,,,Ribas,,,,a,,,post-doctoral,,,astronomer,,,of,,,the,,,National,,,Observatory,,,(ON),,,,in,,,Rio,,,de,,,Janeiro,[7],,,and,,,65,,,other,,,researchers,,,from,,,34,,,institutions,,,in,,,12,,,countries,[1],,,was,,,able,,,to,,,observe,,,this,,,occultation,,,event,,,,a,,,phenomenon,,,during,,,which,,,a,,,star,,,disappears,,,behind,,,its,,,occulting,,,body.[1],,,The,,,1.54-metre,,,Danish,,,National,,,Telescope,,,at,,,La,,,Silla,,,Observatory,,,,due,,,to,,,the,,,much,,,faster,,,data,,,acquisition,,,rate,,,of,,,its,,,'Lucky,,,Imager',,,camera,,,(10Hz),,,,was,,,the,,,only,,,telescope,,,able,,,to,,,resolve,,,the,,,individual,,,rings.[1]Properties[edit]The,,discovery,,was,,made,,by,,a,,team,,of,,astronomers,,using,,ten,,telescopes,,at,,various,,locations,,in,,Argentina,,,Brazil,,,and,,Chile,,in,,South,,America,,during,,observation,,of,,a,,stellar,,occultation,,on,,3,,June,,2013,,,and,,was,,announced,,on,,26,,March,,2014.[1]L.;,,,Snodgrass,,,,C.;,,,Roques,,,,F.;,,,Vieira-Martins,,,,R.;,,,Camargo,,,,Jdoi:10.1051/0004-6361/201424461Occultations.org.nzPlanetary,,Society,,blogs2014-03-2726,,March,,2014v,,,,t,,,,e,,,,2014,,,,in,,,,space,,,,Space,,,,probes,,,,Chang'e,,,,5-T1,,,,(Moon,,,,mission,,,,launched),,,,Hayabusa,,,,2,,,,PROCYON,,,,(asteroid,,,,mission,,,,launched),,,,Venus,,,,Express,,,,(Venus,,,,mission,,,,ends),,,,Dawn,,,,(approaches,,,,1,,,,Ceres),,,,Rosetta/Philae,,,,(orbits/landing,,,,67P/ChuryumovGerasimenko),,,,Impact,,,,events,,,,2014,,,,AA,,,,2014,,,,Ontario,,,,fireball,,,,Supernovae,,,,SN,,,,2014J,,,,Notable,,,,comets,,,,C/2012,,,,K1,,,,(PANSTARRS),,,,C/2013,,,,A1,,,,(Siding,,,,Spring),,,,(Mars,,,,close,,,,approach),,,,C/2013,,,,R1,,,,(Lovejoy),,,,C/2013,,,,V5,,,,(Oukaimeden),,,,C/2014,,,,E2,,,,(Jacques),,,,C/2014,,,,Q2,,,,(Lovejoy),,,,NEOs,,,,Asteroid,,,,close,,,,approaches,,,,2000,,,,EM26,,,,(163132),,,,2002,,,,CU11,,,,(388188),,,,2006,,,,DP14,,,,2007,,,,VK184,,,,(410777),,,,2009,,,,FD,,,,2009,,,,RR,,,,2009,,,,WM1,,,,2014,,,,AF5,,,,2014,,,,DX110,,,,2014,,,,EC,,,,2014,,,,HQ124,,,,2014,,,,LY21,,,,2014,,,,OO6,,,,2014,,,,RC,,,,2014,,,,SC324,,,,2014,,,,XL7,,,,Exoplanets,,,,Kapteyn,,,,b,,,,Kepler-186f,,,,Kepler-296e,,,,Kepler-296f,,,,GU,,,,Piscium,,,,b,,,,Discoveries,,,,Rings,,,,of,,,,Chariklo,,,,2012,,,,VP113,,,,2013,,,,FY27,,,,C/2014,,,,E2,,,,(Jacques),,,,2014,,,,OL339,,,,(quasi-satellite,,,,of,,,,Earth),,,,Deep,,,,space,,,,rendezvous,,,,MAVEN,,,,(Mars,,,,orbit,,,,injection),,,,Mars,,,,Orbiter,,,,Mission,,,,(Mars,,,,orbit,,,,injection),,,,Category:2013,,,,in,,,,space,,,,,,,,Category:2014,,,,in,,,,space,,,,,,,,Category:2015,,,,in,,,,space,,,,IReferences[edit]Retrieved,,,2014-04-13The,,,symmetry,,,of,,,the,,,secondary,,,occultations,,,and,,,multiple,,,observations,,,of,,,the,,,event,,,in,,,various,,,locations,,,helped,,,reconstruct,,,not,,,only,,,the,,,shape,,,and,,,size,,,of,,,the,,,object,,,,but,,,also,,,the,,,thickness,,,,orientation,,,,and,,,location,,,of,,,the,,,ring,,,planes.[9],,,The,,,relatively,,,consistent,,,ring,,,properties,,,inferred,,,from,,,several,,,secondary,,,occultation,,,observations,,,discredit,,,alternative,,,explanations,,,for,,,these,,,features,,,,such,,,as,,,cometary-like,,,outgassing.[1]Forecasts,,,had,,,shown,,,that,,,,as,,,seen,,,from,,,South,,,America,,,,it,,,would,,,pass,,,in,,,front,,,of,,,the,,,12.4-magnitude,,,star,,,UCAC4,,,248-108672,,,,located,,,in,,,the,,,constellation,,,Scorpius,,,,on,,,3,,,June,,,2013.[6]Rings,,,,of,,,,Chariklo,,,,Name[1],,,,Nickname,,,,Orbital,,,,radius(km),,,,Width,,,,(km),,,,Optical,,,,depth,,,,Surface,,,,density,,,,(gm/cm2),,,,Size-equivalent,,,,mass,,,,Gap,,,,between,,,,rings(km),,,,Radial,,,,separation(km),,,,2013C1R,,,,Oiapoque,,,,7002390600000000000390.63.3,,,,70006160000000000006.160.11,,,,to,,,,70007170000000000007.170.14,,,,69994490000000000000.4490.009,,,,to,,,,69993170000000000000.3170.008,,,,30100,,,,icy,,,,body,,,,1km,,,,in,,,,diameter,,,,70008699999999999998.70.4,,,,700114200000000000014.20.2,,,,2013C2R,,,,Chu,,,,7002404800000000000404.83.3,,,,70003400000000000003.4 1.3,,,,2.0,,,,to,,,,70003600000000000003.6 1.1,,,,1.4,,,,69985000000000000000.05 0.06,,,,0.01,,,,to,,,,69987000000000000000.07 0.05,,,,0.03,,,,?,,,,icy,,,,body,,,,0.5km,,,,in,,,,diameter,,,,Negative,,detections,,were,,recorded,,by,,El,,Catalejo,,Observatory,,(Santa,,Rosa,,,La,,Pampa,,,Argentina),,,the,,20-inch,,Planewave,,telescope,,(part,,of,,the,,Searchlight,,Observatory,,Network),,at,,San,,Pedro,,de,,Atacama,,,Chile,,and,,the,,OALM,,instrument,,at,,Los,,Molinos,,Astronomical,,Observatory,,in,,Uruguay 4d9ad8a9ea
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