29 Ιουνίου 2013

NGC 6979 Pickering's Triangle in HaRGB

  • Telescope: William Optics FLT 110 mod with FT 3025
  • Camera: Qhy 2pro mono
  • Mount: Skywatcher EQ6 pro
  • Ts finder 8x50 & Meade DSI 1 for guiding
  • Location: Parnonas mount.Pelloponisos,GR

Information about NGC 6979

The Veil Nebula is a cloud of heated and ionized gas and dust in the constellation Cygnus. It constitutes the visible portions of the Cygnus Loop (radio source W78, or Sharpless 103), a large but relatively faint supernova remnant. The source supernova exploded some 5,000 to 8,000 years ago, and the remnants have since expanded to cover an area roughly 3 degrees in diameter (about 6 times the diameter, or 36 times the area, of the full moon). The distance to the nebula is not precisely known, but Far Ultraviolet Spectroscopic Explorer (FUSE) data supports a distance of about 1,470 light-years.

The Hubble Space Telescope captured several images of the nebula. The analysis of the emissions from the nebula indicate the presence of oxygen, sulfur, and hydrogen. This is also one of the largest, brightest features in the x-ray sky. The nebula was discovered on 1784 September 5 by William Herschel. He described the western end of the nebula as "Extended; passes thro' 52 Cygni... near 2 degree in length", and described the eastern end as "Branching nebulosity... The following part divides into several streams uniting again towards the south."

When finely resolved, some parts of the image appear to be rope-like filaments. The standard explanation is that the shock waves are so thin, less than one part in 50,000 of the radius,[8] that the shell is visible only when viewed exactly edge-on, giving the shell the appearance of a filament. Undulations in the surface of the shell lead to multiple filamentary images, which appear to be intertwined.

Even though the nebula has a relatively bright integrated magnitude of 7, it is spread over so large an area that the surface brightness is quite low, so the nebula is notorious among astronomers as being difficult to see. However, an observer can see the nebula clearly in a telescope using an OIII filter (a filter isolating the wavelength of light from doubly ionized oxygen), as almost all light from this nebula is emitted at this wavelength. An 8-inch (200 mm) telescope equipped with an OIII filter shows the delicate lacework apparent in photographs, and with an OIII filter almost any telescope could conceivably see this nebula. Some argue that it can be seen without any optical aid except an OIII filter held up to the eye.

The brighter segments of the nebula have the New General Catalog designations NGC 6960, 6974, 6979, 6992, and 6995. The easiest segment to find is 6960, which runs behind the naked eye star 52 Cygni. NGC 6992/5 are also relatively easy objects on the eastern side of the loop. NGC 6974 and NGC 6979 are visible as knots in an area of nebulosity along the northern rim. Pickering's Triangle is much fainter, and has no NGC number (though 6979 is occasionally used to refer to it). It was discovered photographically in 1904 by Williamina Fleming (after the New General Catalogue was published), but credit went to Edward Charles Pickering, the director of her observatory, as was the custom of the day.

28 Ιουνίου 2013

NGC 281 Pacman nebula in NB

-Telescope: William Optics FLT 110 modified
-Mount: Skywatcher EQ6 Skyscan Pro with EQMod & EQDir
-CCD: Qhy2 Pro at -10c
-Guiding: TS finder 8x50 & Meade DSI 1
-Ha: 13x600sec 1x1bin
-O3 & S2: 12x600 1x1bin
-Total exposure: 395 minutes
-Location: Manor Observatory, Piraeus,GR

Information about NGC 281

NGC 281 is an H II region in the constellation of Cassiopeia and part of the Perseus Spiral Arm. It includes the open cluster IC 1590, the multiple star HD 5005, and several Bok globules. Colloquially, NGC 281 is also known as the Pacman Nebula for its resemblance to the video game character.

The nebula was discovered in August 1883 by E. E. Barnard, who described it as "a large faint nebula, very diffuse." The multiple star HD 5005, also called \beta1, was discovered by S. W. Burnham. It consists of an 8th-magnitude primary with four companions at distances between 1.4 and 15.7 seconds of arc. There has been no appreciable change in this quintuple system since the first measurements were made in 1875.

The nebula is visible in amateur telescopes from dark sky locations. In his book Deep Sky Wonders, Walter Scott Houston describes the appearance of the nebula in small telescopes.

There was a faint glow in the immediate vicinity of the multiple star, with an occasional impression of a much larger nebulosity...Its surface brightness was much less than that of M33 in Triangulum or NGC 205, the distant companion of the Andromeda galaxy.

27 Ιουνίου 2013

NGC 7293 Helix nebula in LRGB

-Telescope: William Optics FLT 110 modified
-Mount: Skywatcher EQ6 Skyscan Pro with EQMod & EQDir
-CCD: Qhy2 Pro at -10c
-Guiding: TS finder 8x50 & Meade DSI 1
-L: 36x300 bin 1x1
-RGB : 6x300 bin 2x2 all
-Total exposure: -----
-Location: Mountain Parnon Pelloponisos,GR

Information about NGC 7293

The Helix Nebula, also known as The Helix, NGC 7293, is a large planetary nebula (PN) located in the constellation Aquarius. Discovered by Karl Ludwig Harding, probably before 1824, this object is one of the closest to the Earth of all the bright planetary nebulae. The estimated distance is about 215 parsecs or 700 light-years. It is similar in appearance to the Ring Nebula, whose size, age, and physical characteristics are similar to the Dumbbell Nebula, varying only in its relative proximity and the appearance from the equatorial viewing angle.

The Helix Nebula has sometimes been referred to as the "Eye of God" in pop culture.

The Helix Nebula is an example of a planetary nebula, or 'planetary' formed at the end of a star's evolution. Gases from the star in the surrounding space appear, from our vantage point, as if we are looking down a helix structure. The remnant central stellar core, known as a planetary nebula nucleus or PNN, is destined to become a white dwarf star. The observed glow of the central star is so energetic that it causes the previously expelled gases to brightly fluoresce.

The Helix Nebula in the constellation of Aquarius lies about 700 light-years away, spanning about 0.8 parsec or 2.5 light-years. Recent images by the Hubble Space Telescope of the Helix Nebula are a composite of newly released images from the ACS instrument and the wide-angle images from the Mosaic Camera on the WIYN 0.9-metre telescope at Kitt Peak National Observatory.

Currently, the age is estimated to be 10,600+2,300 −1,200 years, based solely upon a measured expansion rate of 31 km·s−1

16 Ιουνίου 2013

IC 5146 -Reprocessed old fits-

IC 5146 Cocoon Nebula

  • Telescope: William Optics FLT 110 mod with FT 3025 
  • Camera: Qhy 2pro mono
  • Mount: Skywatcher EQ6 pro
  • Ts finder 8x50 & Meade DSI 1 for guiding
  • Astronomik 6nm Ha : 12x600sec
  • Luminance :  20x180sec
  • Red : 12x180
  • Green : 9x180
  • Blue : 10x180
  • Total exposure : 273 minutes
  • Location: Kithaironas mount.-Attiki,GR

IC 5146 (also Caldwell 19, Sh 2-125, and the Cocoon Nebula) is a reflection/emission nebula and Caldwell object in the constellation Cygnus. IC 5146 refers specifically to the nebula and Collinder 470 to the star cluster.[3] It shines at magnitude +10.0[4]/+9.3[2]/+7.2.[5] Its celestial coordinates are RA 21h 53.5m, dec+47° 16′. It is located near the naked-eye star Pi Cygni, the open cluster NGC 7209 in Lacerta, and the bright open cluster M39.[1][4] The cluster is about 4,000 ly away, and the central star that lights it formed about 100,000 years ago;[6] the nebula is about 12 arcmins across, which is equivalent to a span of 15 light years.[5] When viewing IC 5146, dark nebula Barnard 168 (B168) is an inseparable part of the experience, forming a dark lane that surrounds the cluster and projects westward forming the appearance of a trail behind the Cocoon.

13 Ιουνίου 2013

M 57 The Ring Nebula

M 57 in HaO3LRGB

-Telescope: William Optics FLT 110 with F/T focuser 3025 & Starizona usb motor focus
-Mount: Skywatcher ΗEQ5 pro & EQ6 Skyscan pro
-Chip: Atik 314L+ at -5c
-Guiding: TS finder 8x50 with Meade DSI I pro
-Filter wheel: Starlight Xpress usb 7x1.25
-Location: Manor Obs(Ha & O3) & Mountain Kithaironas (LRGB)
-Luminance: 24x300sec 1x1bin
-Red: 12x300sec 1x1bin
-Green: 12x240sec 1x1bin
-Blue: 12x300sec 1x1bin

-Ha Astrodon 5nm :15x600sec -  1x1500sec - 4x1200sec
-O3 Astrodon 5nm : 12x300sec
-Total: 10hours and 05 min
-Programs I have used-
Maxim DL ,Pixinsight 1.6, Photoshop CS5, The Sky6 ,Focusmax
The Ring Nebula (also catalogued as Messier 57, M57 or NGC 6720) is a planetary nebula in the northern constellation of Lyra.[5] Such objects are formed when a shell of ionized gas is expelled into the surrounding interstellar medium by a red giant star, which was passing through the last stage in its evolution before becoming a white dwarf.
This nebula was discovered by the French astronomer 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, fellow French astronomer Charles Messier independently found the same nebula while searching for comets. It was then entered into his catalogue as the 57th object. Messier and German-born astronomer William Herschel speculated that the nebula was formed by multiple faint stars that were unresolvable with his telescope.