 Random files - User galleries |
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Kens_den.jpg348 viewsKen's den.Martin
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Venus_3sec_freehand.jpg433 viewsVenusMartin
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Dougs_scope.jpg358 viewsMartin
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Cheriocrop.jpgCherio nebula.363 viewsM57 is located in Lyra, south of its brightest star Vega. Vega is the northwestern vertex of the three stars of the Summer Triangle. M57 lies about 40% of the angular distance from β Lyrae to γ Lyrae.[5]
M57 is best seen through at least a 20 cm (8-inch) telescope, but even a 7.5 cm (3-inch) telescope will show the ring.[5] Larger instruments will show a few darker zones on the eastern and western edges of the ring, and some faint nebulosity inside the disk.
This nebula was discovered by Antoine Darquier de Pellepoix in January, 1779, who reported that it was "...as large as Jupiter and resembles a planet which is fading." Later the same month, Charles Messier independently found the same nebula while searching for comets. It was then entered into his catalogue as the 57th object. Messier and William Herschel also speculated that the nebula was formed by multiple faint stars that were unable to resolve with his telescope.[6][7]
In 1800, Count Friedrich von Hahn discovered the faint central star in the heart of the nebula. In 1864, William Huggins examined the spectra of multiple nebulae, discovering that some of these objects, including M57, displayed the spectra of bright emission lines characteristic of fluorescing glowing gases. Huggins concluded that most planetary nebulae were not composed of unresolved stars, as had been previously suspected, but were nebulosities.[8][9]Martin
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 Last additions - User galleries |
rosette_done_ha2Mb.jpgRosetta in HA.404 viewsStill lots of noise in the surroundings so will need more exposures.MartinDec 28, 2014
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Eta_Carinae_done_ha2Mb.jpgEta Carinae with the EQ8 mount.713 viewsMartinDec 28, 2014
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Eta_Carina.jpgEta Carinae441 viewstest image with OAG.MartinFeb 12, 2014
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Lagoondone2Mb.jpgLagoon nebula571 viewsDone with the ED100 and Hutech FR/FF.MartinMay 15, 2013
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triffid_done2MB.jpgTriffid nebula638 viewsDone with the ED100 and Hutech FR/FF.MartinMay 15, 2013
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testing.jpgtestimage856 views2X30Seconds at ISO1600MartinMay 12, 2012
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Sombrerocropdone.jpgSombrero galaxy1412 viewsThe Sombrero Galaxy (also known as M104 or NGC 4594) is an unbarred spiral galaxy in the constellation Virgo located 28 million light years from Earth. It has a bright nucleus, an unusually large central bulge, and a prominent dust lane in its inclined disk. The dark dust lane and the bulge give this galaxy the appearance of a sombrero. Astronomers initially thought that the halo was small and light, indicative of a spiral galaxy. But Spitzer found that halo around the Sombrero Galaxy is larger and more massive than previously thought, indicative of a giant elliptical galaxy. [5] The galaxy has an apparent magnitude of +9.0, making it easily visible with amateur telescopes. The large bulge, the central supermassive black hole, and the dust lane all attract the attention of professional astronomers.MartinMay 11, 2012
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NGC4945.jpgNGC4945.942 viewsNGC4945 with the Supernova.MartinApr 11, 2012
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