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NGC 2184
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NGC 2184 (also known as the Mini-Hyades Cluster) is a magnitude +13.6 asterism located in the constellation Orion. The brightest star is magnitude +9.2 The group of 5 stars, or asterism, was discovered by British astronomer John Herschel using a 47.5 cm (18.7 inch) reflecting telescope at Windsor...
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NGC 2219
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NGC 2219 is a scattered open cluster located 6,600 light-years away in the constellation Monoceros. The cluster contains about 20 stars of magnitude 7-13 The cluster or asterism, was discovered by British astronomer John Herschel using a 47.5 cm (18.7 inch) reflecting telescope on the 19th Febru...
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NGC 2234
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NGC 2234 (also UGC 7501, MCG 3-32-25 and PGC 40477) is a magnitude +13.9 large open cluster located 5274 ±245 light-years away in the constellation Gemini. The cluster consists of scattered magnitude +11 stars over half a degree across. The cluster, or grouping, was discovered by German-British a...
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Messier 46
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Title: The Open Cluster NGC 2437 (Messier 46) Authors: T. J. Davidge The stellar content of the open cluster NGC 2437 (Messier 46) is investigated using moderately deep u*,g', and r' MegaCam images. When compared with solar metallicity isochrones, the (g', u'-g') and (r', g'-r') CMDs are cons...
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Messier 48
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NGC 2548 (also Messier 48, M48, Collinder 17 and OCL 584) is a magnitude +5.8 open cluster located 1500 light-years away on the western border of the constellation Hydra. The cluster comprises of at least 80 of stars (of which 50 are brighter than magnitude +13). The brightest of them are magnitude +8...
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M dwarf star protoplanets
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Title: N-body simulations of planetary accretion around M dwarf stars Authors: Masahiro Ogihara, Shigeru Ida We have investigated planetary accretion from planetesimals in terrestrial planet regions inside the ice line around M dwarf stars through N-body simulations including tidal intera...
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NGC 2670
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NGC 2670 (also OCL 764 and ESO 210-SC5) is a magnitude +7.8 open star cluster located in the constellation Vela. The cluster was discovered by British astronomer John Herschel using a 47.5 cm (18.7 inch) reflecting telescope at the Cape of Good Hope on the 18th February 1836. Right Ascension 08h 45m 3...
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NGC 1708
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NGC 1708 is a magnitude +11.0 open cluster located 1957 light-years away in the constellation Camelopardalis. The cluster is about 575 million year old. The cluster was discovered by British astronomer John Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Windsor Road, Slough, on t...
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NGC 2588
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NGC 2588 (also OCL 715 and ESO 370-SC10) is a magnitude +11.8 open cluster located 16,145 light-years away in the constellation Puppis. NGC 2588 is about 450 million years old. The cluster was discovered by British astronomer John Herschel using a 47.5 cm (18.7 inch) reflecting telescope at the Cap...
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Messier 97
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The Owl Nebula Stars similar to the Sun end their lives as white dwarfs. But, before becoming those dense stellar corpses, they expel their outer gaseous layers and they ornate the sky for some thousands of years with the most beautiful objects in the universe: planetary nebulae. M97, better known a...
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Terzan 7
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Hubble Looks Into Terzan 7 Named after its discoverer, the French-Armenian astronomer Agop Terzan, this is the globular cluster Terzan 7 - a densely packed ball of stars bound together by gravity. It lies just over 75,000 light-years away from us on the other side of our galaxy, the Milky Way. It is a p...
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NGC 1647
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NGC 1647 (also OCL 457 and Collinder 54) is a magnitude +6.4 open cluster located 1800 light-years away in the constellation Taurus. The cluster is 4° north of Aldebaran near the Pleiades open cluster. The cluster has an diameter of 23 light years, and an estimated age of 150 million years. The clust...
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NGC 2455
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NGC 2455 (also OCL 636 and ESO 560-SC15) is a magnitude +10.2 open cluster located 8643 light-years away in the constellation Puppis. The cluster contains ~50 stars within an angular size of 15.0' The cluster was discovered by British astronomer John Herschel using a 47.5 cm (18.7 inch) reflecting...
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NGC 2247
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NGC 2247 (also CED 81 and OCL 575) is a magnitude +8.5 reflection nebula located 2.480 light-years away in the constellation Monoceros. The nebula was discovered by Irish astronomer R. J. Mitchell, assistant to William Parsons, 3rd Earl of Rosse, using a 182.88 cm (72 inch) speculum reflector at Bi...
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NGC 2345
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NGC 2345 (also OCL 575) is a magnitude +7.7 open cluster located 7,342 light-years away in the constellation Canis Major. The cluster was discovered by British astronomer John Herschel, using a 47.5 cm (18.7 inch) reflecting telescope at the Cape of Good Hope on the 14th February 1836. Right Ascen...
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