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Cheriocrop.jpg
Cheriocrop.jpgCherio nebula.434 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
Jen_preparing.jpg
Jen_preparing.jpg424 viewsMartin
Lake~0.jpg
Lake~0.jpg428 viewsMartin
horsephotobucket.jpg
horsephotobucket.jpgHorsehead nebula.645 viewsThe Horsehead Nebula (also known as Barnard 33 in bright nebula IC 434) is a dark nebula in the constellation Orion. The nebula is located just below (to the south of) Alnitak, the star farthest left on Orion's Belt, and is part of the much larger Orion Molecular Cloud Complex. The Horsehead Nebula is approximately 1500 light years from Earth. It is one of the most identifiable nebulae because of the shape of its swirling cloud of dark dust and gases, which is similar to that of a horse's head when viewed from Earth. The shape was first noticed in 1888 by Williamina Fleming on photographic plate B2312 taken at the Harvard College Observatory.

The red glow originates from hydrogen gas predominantly behind the nebula, ionized by the nearby bright star Sigma Orionis. The darkness of the Horsehead is caused mostly by thick dust, although the lower part of the Horsehead's neck casts a shadow to the left. Streams of gas leaving the nebula are funneled by a strong magnetic field. Bright spots in the Horsehead Nebula's base are young stars just in the process of forming.
Martin
M42_570Kb.jpg
M42_570Kb.jpgM42.540 viewsQHY9 mono on ED80 and guided with a finderscope on a G11 with Gemini2
5 Minute LRGB with the core blended in with 30 second LRGB.
Martin
Jen_again.jpg
Jen_again.jpg435 viewsMartin
centaurus-A.jpg
centaurus-A.jpgCentaurus A.533 viewsThe Centaurus A/M83 Group is a complex group of galaxies in the constellations Hydra, Centaurus, and Virgo. The group may be roughly divided into two subgroups. The Cen A Subgroup, at a distance of 11.9 Mly (3.66 Mpc), is centered around Centaurus A, a nearby radio galaxy.[3] The M83 Subgroup, at a distance of 14.9 Mly (4.56 Mpc), is centered around the Messier 83 (M83), a face-on spiral galaxy.[3]

This group is sometimes identified as one group[4][5] and sometimes identified as two groups.[6] Hence, some references will refer to two objects named the Centaurus A Group and the M83 Group. However, the galaxies around Centaurus A and the galaxies around M83 are physically close to each other, and both subgroups appear not to be moving relative to each other.[3]

The Centaurus A/M83 Group is part of the Virgo Supercluster, the local supercluster of which the Local Group is an outlying member.
Martin
Eta_Carina.jpg
Eta_Carina.jpgEta Carinae533 viewstest image with OAG.Martin

Last additions - User galleries
rosette_done_ha2Mb.jpg
rosette_done_ha2Mb.jpgRosetta in HA.501 viewsStill lots of noise in the surroundings so will need more exposures.MartinDec 28, 2014
Eta_Carinae_done_ha2Mb.jpg
Eta_Carinae_done_ha2Mb.jpgEta Carinae with the EQ8 mount.812 viewsMartinDec 28, 2014
Eta_Carina.jpg
Eta_Carina.jpgEta Carinae533 viewstest image with OAG.MartinFeb 12, 2014
Lagoondone2Mb.jpg
Lagoondone2Mb.jpgLagoon nebula669 viewsDone with the ED100 and Hutech FR/FF.MartinMay 15, 2013
triffid_done2MB.jpg
triffid_done2MB.jpgTriffid nebula736 viewsDone with the ED100 and Hutech FR/FF.MartinMay 15, 2013
testing.jpg
testing.jpgtestimage971 views2X30Seconds at ISO1600MartinMay 12, 2012
Sombrerocropdone.jpg
Sombrerocropdone.jpgSombrero galaxy1546 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
NGC4945.jpg
NGC4945.jpgNGC4945.1070 viewsNGC4945 with the Supernova.MartinApr 11, 2012